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2021 lines
83 KiB
2021 lines
83 KiB
# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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# file Copyright.txt or https://cmake.org/licensing for details.
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#[=======================================================================[.rst:
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FetchContent
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------------------
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.. versionadded:: 3.11
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.. only:: html
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.. contents::
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.. note:: The :guide:`Using Dependencies Guide` provides a high-level
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introduction to this general topic. It provides a broader overview of
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where the ``FetchContent`` module fits into the bigger picture,
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including its relationship to the :command:`find_package` command.
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The guide is recommended pre-reading before moving on to the details below.
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Overview
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^^^^^^^^
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This module enables populating content at configure time via any method
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supported by the :module:`ExternalProject` module. Whereas
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:command:`ExternalProject_Add` downloads at build time, the
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``FetchContent`` module makes content available immediately, allowing the
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configure step to use the content in commands like :command:`add_subdirectory`,
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:command:`include` or :command:`file` operations.
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Content population details should be defined separately from the command that
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performs the actual population. This separation ensures that all the
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dependency details are defined before anything might try to use them to
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populate content. This is particularly important in more complex project
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hierarchies where dependencies may be shared between multiple projects.
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The following shows a typical example of declaring content details for some
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dependencies and then ensuring they are populated with a separate call:
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.. code-block:: cmake
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FetchContent_Declare(
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googletest
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GIT_REPOSITORY https://github.com/google/googletest.git
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GIT_TAG 703bd9caab50b139428cea1aaff9974ebee5742e # release-1.10.0
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)
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FetchContent_Declare(
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myCompanyIcons
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URL https://intranet.mycompany.com/assets/iconset_1.12.tar.gz
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URL_HASH MD5=5588a7b18261c20068beabfb4f530b87
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)
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FetchContent_MakeAvailable(googletest myCompanyIcons)
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The :command:`FetchContent_MakeAvailable` command ensures the named
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dependencies have been populated, either by an earlier call or by populating
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them itself. When performing the population, it will also add them to the
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main build, if possible, so that the main build can use the populated
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projects' targets, etc. See the command's documentation for how these steps
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are performed.
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When using a hierarchical project arrangement, projects at higher levels in
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the hierarchy are able to override the declared details of content specified
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anywhere lower in the project hierarchy. The first details to be declared
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for a given dependency take precedence, regardless of where in the project
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hierarchy that occurs. Similarly, the first call that tries to populate a
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dependency "wins", with subsequent populations reusing the result of the
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first instead of repeating the population again.
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See the :ref:`Examples <fetch-content-examples>` which demonstrate
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this scenario.
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In some cases, the main project may need to have more precise control over
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the population, or it may be required to explicitly define the population
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steps in a way that cannot be captured by the declared details alone.
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For such situations, the lower level :command:`FetchContent_GetProperties` and
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:command:`FetchContent_Populate` commands can be used. These lack the richer
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features provided by :command:`FetchContent_MakeAvailable` though, so their
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direct use should be considered a last resort. The typical pattern of such
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custom steps looks like this:
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.. code-block:: cmake
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# NOTE: Where possible, prefer to use FetchContent_MakeAvailable()
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# instead of custom logic like this
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# Check if population has already been performed
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FetchContent_GetProperties(depname)
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if(NOT depname_POPULATED)
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# Fetch the content using previously declared details
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FetchContent_Populate(depname)
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# Set custom variables, policies, etc.
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# ...
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# Bring the populated content into the build
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add_subdirectory(${depname_SOURCE_DIR} ${depname_BINARY_DIR})
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endif()
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The ``FetchContent`` module also supports defining and populating
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content in a single call, with no check for whether the content has been
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populated elsewhere already. This should not be done in projects, but may
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be appropriate for populating content in CMake's script mode.
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See :command:`FetchContent_Populate` for details.
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Commands
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^^^^^^^^
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.. command:: FetchContent_Declare
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.. code-block:: cmake
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FetchContent_Declare(
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<name>
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<contentOptions>...
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[SYSTEM]
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[OVERRIDE_FIND_PACKAGE |
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FIND_PACKAGE_ARGS args...]
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)
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The ``FetchContent_Declare()`` function records the options that describe
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how to populate the specified content. If such details have already
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been recorded earlier in this project (regardless of where in the project
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hierarchy), this and all later calls for the same content ``<name>`` are
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ignored. This "first to record, wins" approach is what allows hierarchical
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projects to have parent projects override content details of child projects.
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The content ``<name>`` can be any string without spaces, but good practice
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would be to use only letters, numbers and underscores. The name will be
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treated case-insensitively and it should be obvious for the content it
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represents, often being the name of the child project or the value given
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to its top level :command:`project` command (if it is a CMake project).
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For well-known public projects, the name should generally be the official
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name of the project. Choosing an unusual name makes it unlikely that other
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projects needing that same content will use the same name, leading to
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the content being populated multiple times.
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The ``<contentOptions>`` can be any of the download, update or patch options
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that the :command:`ExternalProject_Add` command understands. The configure,
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build, install and test steps are explicitly disabled and therefore options
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related to them will be ignored. The ``SOURCE_SUBDIR`` option is an
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exception, see :command:`FetchContent_MakeAvailable` for details on how that
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affects behavior.
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In most cases, ``<contentOptions>`` will just be a couple of options defining
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the download method and method-specific details like a commit tag or archive
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hash. For example:
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.. code-block:: cmake
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FetchContent_Declare(
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googletest
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GIT_REPOSITORY https://github.com/google/googletest.git
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GIT_TAG 703bd9caab50b139428cea1aaff9974ebee5742e # release-1.10.0
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)
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FetchContent_Declare(
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myCompanyIcons
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URL https://intranet.mycompany.com/assets/iconset_1.12.tar.gz
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URL_HASH MD5=5588a7b18261c20068beabfb4f530b87
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)
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FetchContent_Declare(
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myCompanyCertificates
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SVN_REPOSITORY svn+ssh://svn.mycompany.com/srv/svn/trunk/certs
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SVN_REVISION -r12345
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)
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Where contents are being fetched from a remote location and you do not
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control that server, it is advisable to use a hash for ``GIT_TAG`` rather
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than a branch or tag name. A commit hash is more secure and helps to
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confirm that the downloaded contents are what you expected.
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.. versionchanged:: 3.14
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Commands for the download, update or patch steps can access the terminal.
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This may be needed for things like password prompts or real-time display
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of command progress.
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.. versionadded:: 3.22
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The :variable:`CMAKE_TLS_VERIFY`, :variable:`CMAKE_TLS_CAINFO`,
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:variable:`CMAKE_NETRC` and :variable:`CMAKE_NETRC_FILE` variables now
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provide the defaults for their corresponding content options, just like
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they do for :command:`ExternalProject_Add`. Previously, these variables
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were ignored by the ``FetchContent`` module.
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.. versionadded:: 3.24
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``FIND_PACKAGE_ARGS``
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This option is for scenarios where the
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:command:`FetchContent_MakeAvailable` command may first try a call to
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:command:`find_package` to satisfy the dependency for ``<name>``.
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By default, such a call would be simply ``find_package(<name>)``, but
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``FIND_PACKAGE_ARGS`` can be used to provide additional arguments to be
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appended after the ``<name>``. ``FIND_PACKAGE_ARGS`` can also be given
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with nothing after it, which indicates that :command:`find_package` can
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still be called if :variable:`FETCHCONTENT_TRY_FIND_PACKAGE_MODE` is
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set to ``OPT_IN`` or is not set.
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Everything after the ``FIND_PACKAGE_ARGS`` keyword is appended to the
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:command:`find_package` call, so all other ``<contentOptions>`` must
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come before the ``FIND_PACKAGE_ARGS`` keyword. If the
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:variable:`CMAKE_FIND_PACKAGE_TARGETS_GLOBAL` variable is set to true
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at the time ``FetchContent_Declare()`` is called, a ``GLOBAL`` keyword
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will be appended to the :command:`find_package` arguments if it was
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not already specified. It will also be appended if
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``FIND_PACKAGE_ARGS`` was not given, but
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:variable:`FETCHCONTENT_TRY_FIND_PACKAGE_MODE` was set to ``ALWAYS``.
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``OVERRIDE_FIND_PACKAGE`` cannot be used when ``FIND_PACKAGE_ARGS`` is
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given.
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:ref:`dependency_providers` discusses another way that
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:command:`FetchContent_MakeAvailable` calls can be redirected.
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``FIND_PACKAGE_ARGS`` is intended for project control, whereas
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dependency providers allow users to override project behavior.
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``OVERRIDE_FIND_PACKAGE``
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When a ``FetchContent_Declare(<name> ...)`` call includes this option,
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subsequent calls to ``find_package(<name> ...)`` will ensure that
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``FetchContent_MakeAvailable(<name>)`` has been called, then use the
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config package files in the :variable:`CMAKE_FIND_PACKAGE_REDIRECTS_DIR`
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directory (which are usually created by ``FetchContent_MakeAvailable()``).
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This effectively makes :command:`FetchContent_MakeAvailable` override
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:command:`find_package` for the named dependency, allowing the former to
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satisfy the package requirements of the latter. ``FIND_PACKAGE_ARGS``
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cannot be used when ``OVERRIDE_FIND_PACKAGE`` is given.
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If a :ref:`dependency provider <dependency_providers>` has been set
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and the project calls :command:`find_package` for the ``<name>``
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dependency, ``OVERRIDE_FIND_PACKAGE`` will not prevent the provider
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from seeing that call. Dependency providers always have the opportunity
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to intercept any direct call to :command:`find_package`, except if that
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call contains the ``BYPASS_PROVIDER`` option.
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.. versionadded:: 3.25
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``SYSTEM``
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If the ``SYSTEM`` argument is provided, targets created by
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the dependency will have their :prop_tgt:`SYSTEM` property
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set to true when populated by :command:`FetchContent_MakeAvailable`.
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The entries in their :prop_tgt:`INTERFACE_INCLUDE_DIRECTORIES`
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will be treated as ``SYSTEM`` include directories when
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compiling consumers.
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.. command:: FetchContent_MakeAvailable
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.. versionadded:: 3.14
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.. code-block:: cmake
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FetchContent_MakeAvailable(<name1> [<name2>...])
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This command ensures that each of the named dependencies are made available
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to the project by the time it returns. There must have been a call to
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:command:`FetchContent_Declare` for each dependency, and the first such call
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will control how that dependency will be made available, as described below.
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If ``<lowercaseName>_SOURCE_DIR`` is not set:
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* .. versionadded:: 3.24
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If a :ref:`dependency provider <dependency_providers>` is set, call the
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provider's command with ``FETCHCONTENT_MAKEAVAILABLE_SERIAL`` as the
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first argument, followed by the arguments of the first call to
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:command:`FetchContent_Declare` for ``<name>``. If ``SOURCE_DIR`` or
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``BINARY_DIR`` were not part of the original declared arguments, they
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will be added with their default values.
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If :variable:`FETCHCONTENT_TRY_FIND_PACKAGE_MODE` was set to ``NEVER``
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when the details were declared, any ``FIND_PACKAGE_ARGS`` will be
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omitted. The ``OVERRIDE_FIND_PACKAGE`` keyword is also always omitted.
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If the provider fulfilled the request, ``FetchContent_MakeAvailable()``
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will consider that dependency handled, skip the remaining steps below
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and move on to the next dependency in the list.
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* .. versionadded:: 3.24
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If permitted, :command:`find_package(<name> [<args>...]) <find_package>`
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will be called, where ``<args>...`` may be provided by the
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``FIND_PACKAGE_ARGS`` option in :command:`FetchContent_Declare`.
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The value of the :variable:`FETCHCONTENT_TRY_FIND_PACKAGE_MODE` variable
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at the time :command:`FetchContent_Declare` was called determines whether
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``FetchContent_MakeAvailable()`` can call :command:`find_package`.
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If the :variable:`CMAKE_FIND_PACKAGE_TARGETS_GLOBAL` variable is set to
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true when ``FetchContent_MakeAvailable()`` is called, it still affects
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any imported targets created when that in turn calls
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:command:`find_package`, even if that variable was false when the
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corresponding details were declared.
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If the dependency was not satisfied by a provider or a
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:command:`find_package` call, ``FetchContent_MakeAvailable()`` then uses
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the following logic to make the dependency available:
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* If the dependency has already been populated earlier in this run, set
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the ``<lowercaseName>_POPULATED``, ``<lowercaseName>_SOURCE_DIR`` and
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``<lowercaseName>_BINARY_DIR`` variables in the same way as a call to
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:command:`FetchContent_GetProperties`, then skip the remaining steps
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below and move on to the next dependency in the list.
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* Call :command:`FetchContent_Populate` to populate the dependency using
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the details recorded by an earlier call to :command:`FetchContent_Declare`.
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Halt with a fatal error if no such details have been recorded.
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:variable:`FETCHCONTENT_SOURCE_DIR_<uppercaseName>` can be used to override
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the declared details and use content provided at the specified location
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instead.
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* .. versionadded:: 3.24
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Ensure the :variable:`CMAKE_FIND_PACKAGE_REDIRECTS_DIR` directory
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contains a ``<lowercaseName>-config.cmake`` and a
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``<lowercaseName>-config-version.cmake`` file (or equivalently
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``<name>Config.cmake`` and ``<name>ConfigVersion.cmake``).
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The directory that the :variable:`CMAKE_FIND_PACKAGE_REDIRECTS_DIR`
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variable points to is cleared at the start of every CMake run.
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If no config file exists when :command:`FetchContent_Populate` returns,
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a minimal one will be written which :command:`includes <include>` any
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``<lowercaseName>-extra.cmake`` or ``<name>Extra.cmake`` file with the
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``OPTIONAL`` flag (so the files can be missing and won't generate a
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warning). Similarly, if no config version file exists, a very simple
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one will be written which sets ``PACKAGE_VERSION_COMPATIBLE`` and
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``PACKAGE_VERSION_EXACT`` to true. This ensures all future calls to
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:command:`find_package()` for the dependency will use the redirected
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config file, regardless of any version requirements.
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CMake cannot automatically determine an arbitrary dependency's version,
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so it cannot set ``PACKAGE_VERSION``.
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When a dependency is pulled in via :command:`add_subdirectory` in the
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next step, it may choose to overwrite the generated config version file
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in :variable:`CMAKE_FIND_PACKAGE_REDIRECTS_DIR` with one that also sets
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``PACKAGE_VERSION``.
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The dependency may also write a ``<lowercaseName>-extra.cmake`` or
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``<name>Extra.cmake`` file to perform custom processing or define any
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variables that their normal (installed) package config file would
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otherwise usually define (many projects don't do any custom processing
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or set any variables and therefore have no need to do this).
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If required, the main project can write these files instead if the
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dependency project doesn't do so. This allows the main project to
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add missing details from older dependencies that haven't or can't be
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updated to support this functionality.
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See `Integrating With find_package()`_ for examples.
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* If the top directory of the populated content contains a ``CMakeLists.txt``
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file, call :command:`add_subdirectory` to add it to the main build.
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It is not an error for there to be no ``CMakeLists.txt`` file, which
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allows the command to be used for dependencies that make downloaded
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content available at a known location, but which do not need or support
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being added directly to the build.
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.. versionadded:: 3.18
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The ``SOURCE_SUBDIR`` option can be given in the declared details to
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look somewhere below the top directory instead (i.e. the same way that
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``SOURCE_SUBDIR`` is used by the :command:`ExternalProject_Add`
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command). The path provided with ``SOURCE_SUBDIR`` must be relative
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and will be treated as relative to the top directory. It can also
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point to a directory that does not contain a ``CMakeLists.txt`` file
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or even to a directory that doesn't exist. This can be used to avoid
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adding a project that contains a ``CMakeLists.txt`` file in its top
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directory.
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Projects should aim to declare the details of all dependencies they might
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use before they call ``FetchContent_MakeAvailable()`` for any of them.
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This ensures that if any of the dependencies are also sub-dependencies of
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one or more of the others, the main project still controls the details
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that will be used (because it will declare them first before the
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dependencies get a chance to). In the following code samples, assume that
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the ``uses_other`` dependency also uses ``FetchContent`` to add the ``other``
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dependency internally:
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.. code-block:: cmake
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# WRONG: Should declare all details first
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FetchContent_Declare(uses_other ...)
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FetchContent_MakeAvailable(uses_other)
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FetchContent_Declare(other ...) # Will be ignored, uses_other beat us to it
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FetchContent_MakeAvailable(other) # Would use details declared by uses_other
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.. code-block:: cmake
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# CORRECT: All details declared first, so they will take priority
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FetchContent_Declare(uses_other ...)
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FetchContent_Declare(other ...)
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FetchContent_MakeAvailable(uses_other other)
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Note that :variable:`CMAKE_VERIFY_INTERFACE_HEADER_SETS` is explicitly set
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to false upon entry to ``FetchContent_MakeAvailable()``, and is restored to
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its original value before the command returns. Developers typically only
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want to verify header sets from the main project, not those from any
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dependencies. This local manipulation of the
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:variable:`CMAKE_VERIFY_INTERFACE_HEADER_SETS` variable provides that
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intuitive behavior. You can use variables like
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:variable:`CMAKE_PROJECT_INCLUDE` or
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:variable:`CMAKE_PROJECT_<PROJECT-NAME>_INCLUDE` to turn verification back
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on for all or some dependencies. You can also set the
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:prop_tgt:`VERIFY_INTERFACE_HEADER_SETS` property of individual targets.
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.. command:: FetchContent_Populate
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.. note::
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Where possible, prefer to use :command:`FetchContent_MakeAvailable`
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|
instead of implementing population manually with this command.
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.. code-block:: cmake
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|
FetchContent_Populate(<name>)
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In most cases, the only argument given to ``FetchContent_Populate()`` is the
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``<name>``. When used this way, the command assumes the content details have
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been recorded by an earlier call to :command:`FetchContent_Declare`. The
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details are stored in a global property, so they are unaffected by things
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like variable or directory scope. Therefore, it doesn't matter where in the
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project the details were previously declared, as long as they have been
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declared before the call to ``FetchContent_Populate()``. Those saved details
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are then used to construct a call to :command:`ExternalProject_Add` in a
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private sub-build to perform the content population immediately. The
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implementation of ``ExternalProject_Add()`` ensures that if the content has
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already been populated in a previous CMake run, that content will be reused
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rather than repopulating them again. For the common case where population
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involves downloading content, the cost of the download is only paid once.
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An internal global property records when a particular content population
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request has been processed. If ``FetchContent_Populate()`` is called more
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than once for the same content name within a configure run, the second call
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will halt with an error. Projects can and should check whether content
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population has already been processed with the
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:command:`FetchContent_GetProperties` command before calling
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``FetchContent_Populate()``.
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``FetchContent_Populate()`` will set three variables in the scope of the
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caller:
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``<lowercaseName>_POPULATED``
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This will always be set to ``TRUE`` by the call.
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``<lowercaseName>_SOURCE_DIR``
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The location where the populated content can be found upon return.
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``<lowercaseName>_BINARY_DIR``
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A directory intended for use as a corresponding build directory.
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The main use case for the ``<lowercaseName>_SOURCE_DIR`` and
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``<lowercaseName>_BINARY_DIR`` variables is to call
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:command:`add_subdirectory` immediately after population:
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.. code-block:: cmake
|
|
|
|
FetchContent_Populate(FooBar)
|
|
add_subdirectory(${foobar_SOURCE_DIR} ${foobar_BINARY_DIR})
|
|
|
|
The values of the three variables can also be retrieved from anywhere in the
|
|
project hierarchy using the :command:`FetchContent_GetProperties` command.
|
|
|
|
The ``FetchContent_Populate()`` command also supports a syntax allowing the
|
|
content details to be specified directly rather than using any saved
|
|
details. This is more low-level and use of this form is generally to be
|
|
avoided in favor of using saved content details as outlined above.
|
|
Nevertheless, in certain situations it can be useful to invoke the content
|
|
population as an isolated operation (typically as part of implementing some
|
|
other higher level feature or when using CMake in script mode):
|
|
|
|
.. code-block:: cmake
|
|
|
|
FetchContent_Populate(
|
|
<name>
|
|
[QUIET]
|
|
[SUBBUILD_DIR <subBuildDir>]
|
|
[SOURCE_DIR <srcDir>]
|
|
[BINARY_DIR <binDir>]
|
|
...
|
|
)
|
|
|
|
This form has a number of key differences to that where only ``<name>`` is
|
|
provided:
|
|
|
|
- All required population details are assumed to have been provided directly
|
|
in the call to ``FetchContent_Populate()``. Any saved details for
|
|
``<name>`` are ignored.
|
|
- No check is made for whether content for ``<name>`` has already been
|
|
populated.
|
|
- No global property is set to record that the population has occurred.
|
|
- No global properties record the source or binary directories used for the
|
|
populated content.
|
|
- The ``FETCHCONTENT_FULLY_DISCONNECTED`` and
|
|
``FETCHCONTENT_UPDATES_DISCONNECTED`` cache variables are ignored.
|
|
|
|
The ``<lowercaseName>_SOURCE_DIR`` and ``<lowercaseName>_BINARY_DIR``
|
|
variables are still returned to the caller, but since these locations are
|
|
not stored as global properties when this form is used, they are only
|
|
available to the calling scope and below rather than the entire project
|
|
hierarchy. No ``<lowercaseName>_POPULATED`` variable is set in the caller's
|
|
scope with this form.
|
|
|
|
The supported options for ``FetchContent_Populate()`` are the same as those
|
|
for :command:`FetchContent_Declare()`. Those few options shown just
|
|
above are either specific to ``FetchContent_Populate()`` or their behavior is
|
|
slightly modified from how :command:`ExternalProject_Add` treats them:
|
|
|
|
``QUIET``
|
|
The ``QUIET`` option can be given to hide the output associated with
|
|
populating the specified content. If the population fails, the output will
|
|
be shown regardless of whether this option was given or not so that the
|
|
cause of the failure can be diagnosed. The global ``FETCHCONTENT_QUIET``
|
|
cache variable has no effect on ``FetchContent_Populate()`` calls where the
|
|
content details are provided directly.
|
|
|
|
``SUBBUILD_DIR``
|
|
The ``SUBBUILD_DIR`` argument can be provided to change the location of the
|
|
sub-build created to perform the population. The default value is
|
|
``${CMAKE_CURRENT_BINARY_DIR}/<lowercaseName>-subbuild`` and it would be
|
|
unusual to need to override this default. If a relative path is specified,
|
|
it will be interpreted as relative to :variable:`CMAKE_CURRENT_BINARY_DIR`.
|
|
This option should not be confused with the ``SOURCE_SUBDIR`` option which
|
|
only affects the :command:`FetchContent_MakeAvailable` command.
|
|
|
|
``SOURCE_DIR``, ``BINARY_DIR``
|
|
The ``SOURCE_DIR`` and ``BINARY_DIR`` arguments are supported by
|
|
:command:`ExternalProject_Add`, but different default values are used by
|
|
``FetchContent_Populate()``. ``SOURCE_DIR`` defaults to
|
|
``${CMAKE_CURRENT_BINARY_DIR}/<lowercaseName>-src`` and ``BINARY_DIR``
|
|
defaults to ``${CMAKE_CURRENT_BINARY_DIR}/<lowercaseName>-build``.
|
|
If a relative path is specified, it will be interpreted as relative to
|
|
:variable:`CMAKE_CURRENT_BINARY_DIR`.
|
|
|
|
In addition to the above explicit options, any other unrecognized options are
|
|
passed through unmodified to :command:`ExternalProject_Add` to perform the
|
|
download, patch and update steps. The following options are explicitly
|
|
prohibited (they are disabled by the ``FetchContent_Populate()`` command):
|
|
|
|
- ``CONFIGURE_COMMAND``
|
|
- ``BUILD_COMMAND``
|
|
- ``INSTALL_COMMAND``
|
|
- ``TEST_COMMAND``
|
|
|
|
If using ``FetchContent_Populate()`` within CMake's script mode, be aware
|
|
that the implementation sets up a sub-build which therefore requires a CMake
|
|
generator and build tool to be available. If these cannot be found by
|
|
default, then the :variable:`CMAKE_GENERATOR` and/or
|
|
:variable:`CMAKE_MAKE_PROGRAM` variables will need to be set appropriately
|
|
on the command line invoking the script.
|
|
|
|
.. versionadded:: 3.18
|
|
Added support for the ``DOWNLOAD_NO_EXTRACT`` option.
|
|
|
|
.. command:: FetchContent_GetProperties
|
|
|
|
When using saved content details, a call to
|
|
:command:`FetchContent_MakeAvailable` or :command:`FetchContent_Populate`
|
|
records information in global properties which can be queried at any time.
|
|
This information may include the source and binary directories associated with
|
|
the content and also whether or not the content population has been processed
|
|
during the current configure run.
|
|
|
|
.. code-block:: cmake
|
|
|
|
FetchContent_GetProperties(
|
|
<name>
|
|
[SOURCE_DIR <srcDirVar>]
|
|
[BINARY_DIR <binDirVar>]
|
|
[POPULATED <doneVar>]
|
|
)
|
|
|
|
The ``SOURCE_DIR``, ``BINARY_DIR`` and ``POPULATED`` options can be used to
|
|
specify which properties should be retrieved. Each option accepts a value
|
|
which is the name of the variable in which to store that property. Most of
|
|
the time though, only ``<name>`` is given, in which case the call will then
|
|
set the same variables as a call to
|
|
:command:`FetchContent_MakeAvailable(name) <FetchContent_MakeAvailable>` or
|
|
:command:`FetchContent_Populate(name) <FetchContent_Populate>`.
|
|
Note that the ``SOURCE_DIR`` and ``BINARY_DIR`` values can be empty if the
|
|
call is fulfilled by a :ref:`dependency provider <dependency_providers>`.
|
|
|
|
This command is rarely needed when using
|
|
:command:`FetchContent_MakeAvailable`. It is more commonly used as part of
|
|
implementing the following pattern with :command:`FetchContent_Populate`,
|
|
which ensures that the relevant variables will always be defined regardless
|
|
of whether or not the population has been performed elsewhere in the project
|
|
already:
|
|
|
|
.. code-block:: cmake
|
|
|
|
# Check if population has already been performed
|
|
FetchContent_GetProperties(depname)
|
|
if(NOT depname_POPULATED)
|
|
# Fetch the content using previously declared details
|
|
FetchContent_Populate(depname)
|
|
|
|
# Set custom variables, policies, etc.
|
|
# ...
|
|
|
|
# Bring the populated content into the build
|
|
add_subdirectory(${depname_SOURCE_DIR} ${depname_BINARY_DIR})
|
|
endif()
|
|
|
|
.. command:: FetchContent_SetPopulated
|
|
|
|
.. versionadded:: 3.24
|
|
|
|
.. note::
|
|
This command should only be called by
|
|
:ref:`dependency providers <dependency_providers>`. Calling it in any
|
|
other context is unsupported and future CMake versions may halt with a
|
|
fatal error in such cases.
|
|
|
|
.. code-block:: cmake
|
|
|
|
FetchContent_SetPopulated(
|
|
<name>
|
|
[SOURCE_DIR <srcDir>]
|
|
[BINARY_DIR <binDir>]
|
|
)
|
|
|
|
If a provider command fulfills a ``FETCHCONTENT_MAKEAVAILABLE_SERIAL``
|
|
request, it must call this function before returning. The ``SOURCE_DIR``
|
|
and ``BINARY_DIR`` arguments can be used to specify the values that
|
|
:command:`FetchContent_GetProperties` should return for its corresponding
|
|
arguments. Only provide ``SOURCE_DIR`` and ``BINARY_DIR`` if they have
|
|
the same meaning as if they had been populated by the built-in
|
|
:command:`FetchContent_MakeAvailable` implementation.
|
|
|
|
|
|
Variables
|
|
^^^^^^^^^
|
|
|
|
A number of cache variables can influence the behavior where details from a
|
|
:command:`FetchContent_Declare` call are used to populate content.
|
|
|
|
.. note::
|
|
All of these variables are intended for the developer to customize behavior.
|
|
They should not normally be set by the project.
|
|
|
|
.. variable:: FETCHCONTENT_BASE_DIR
|
|
|
|
In most cases, the saved details do not specify any options relating to the
|
|
directories to use for the internal sub-build, final source and build areas.
|
|
It is generally best to leave these decisions up to the ``FetchContent``
|
|
module to handle on the project's behalf. The ``FETCHCONTENT_BASE_DIR``
|
|
cache variable controls the point under which all content population
|
|
directories are collected, but in most cases, developers would not need to
|
|
change this. The default location is ``${CMAKE_BINARY_DIR}/_deps``, but if
|
|
developers change this value, they should aim to keep the path short and
|
|
just below the top level of the build tree to avoid running into path
|
|
length problems on Windows.
|
|
|
|
.. variable:: FETCHCONTENT_QUIET
|
|
|
|
The logging output during population can be quite verbose, making the
|
|
configure stage quite noisy. This cache option (``ON`` by default) hides
|
|
all population output unless an error is encountered. If experiencing
|
|
problems with hung downloads, temporarily switching this option off may
|
|
help diagnose which content population is causing the issue.
|
|
|
|
.. variable:: FETCHCONTENT_FULLY_DISCONNECTED
|
|
|
|
When this option is enabled, no attempt is made to download or update
|
|
any content. It is assumed that all content has already been populated in
|
|
a previous run or the source directories have been pointed at existing
|
|
contents the developer has provided manually (using options described
|
|
further below). When the developer knows that no changes have been made to
|
|
any content details, turning this option ``ON`` can significantly speed up
|
|
the configure stage. It is ``OFF`` by default.
|
|
|
|
.. variable:: FETCHCONTENT_UPDATES_DISCONNECTED
|
|
|
|
This is a less severe download/update control compared to
|
|
:variable:`FETCHCONTENT_FULLY_DISCONNECTED`. Instead of bypassing all
|
|
download and update logic, ``FETCHCONTENT_UPDATES_DISCONNECTED`` only
|
|
disables the update stage. Therefore, if content has not been downloaded
|
|
previously, it will still be downloaded when this option is enabled.
|
|
This can speed up the configure stage, but not as much as
|
|
:variable:`FETCHCONTENT_FULLY_DISCONNECTED`. It is ``OFF`` by default.
|
|
|
|
.. variable:: FETCHCONTENT_TRY_FIND_PACKAGE_MODE
|
|
|
|
.. versionadded:: 3.24
|
|
|
|
This variable modifies the details that :command:`FetchContent_Declare`
|
|
records for a given dependency. While it ultimately controls the behavior
|
|
of :command:`FetchContent_MakeAvailable`, it is the variable's value when
|
|
:command:`FetchContent_Declare` is called that gets used. It makes no
|
|
difference what the variable is set to when
|
|
:command:`FetchContent_MakeAvailable` is called. Since the variable should
|
|
only be set by the user and not by projects directly, it will typically have
|
|
the same value throughout anyway, so this distinction is not usually
|
|
noticeable.
|
|
|
|
``FETCHCONTENT_TRY_FIND_PACKAGE_MODE`` ultimately controls whether
|
|
:command:`FetchContent_MakeAvailable` is allowed to call
|
|
:command:`find_package` to satisfy a dependency. The variable can be set
|
|
to one of the following values:
|
|
|
|
``OPT_IN``
|
|
:command:`FetchContent_MakeAvailable` will only call
|
|
:command:`find_package` if the :command:`FetchContent_Declare` call
|
|
included a ``FIND_PACKAGE_ARGS`` keyword. This is also the default
|
|
behavior if ``FETCHCONTENT_TRY_FIND_PACKAGE_MODE`` is not set.
|
|
|
|
``ALWAYS``
|
|
:command:`find_package` can be called by
|
|
:command:`FetchContent_MakeAvailable` regardless of whether the
|
|
:command:`FetchContent_Declare` call included a ``FIND_PACKAGE_ARGS``
|
|
keyword or not. If no ``FIND_PACKAGE_ARGS`` keyword was given, the
|
|
behavior will be as though ``FIND_PACKAGE_ARGS`` had been provided,
|
|
with no additional arguments after it.
|
|
|
|
``NEVER``
|
|
:command:`FetchContent_MakeAvailable` will not call
|
|
:command:`find_package`. Any ``FIND_PACKAGE_ARGS`` given to the
|
|
:command:`FetchContent_Declare` call will be ignored.
|
|
|
|
As a special case, if the :variable:`FETCHCONTENT_SOURCE_DIR_<uppercaseName>`
|
|
variable has a non-empty value for a dependency, it is assumed that the
|
|
user is overriding all other methods of making that dependency available.
|
|
``FETCHCONTENT_TRY_FIND_PACKAGE_MODE`` will have no effect on that
|
|
dependency and :command:`FetchContent_MakeAvailable` will not try to call
|
|
:command:`find_package` for it.
|
|
|
|
In addition to the above, the following variables are also defined for each
|
|
content name:
|
|
|
|
.. variable:: FETCHCONTENT_SOURCE_DIR_<uppercaseName>
|
|
|
|
If this is set, no download or update steps are performed for the specified
|
|
content and the ``<lowercaseName>_SOURCE_DIR`` variable returned to the
|
|
caller is pointed at this location. This gives developers a way to have a
|
|
separate checkout of the content that they can modify freely without
|
|
interference from the build. The build simply uses that existing source,
|
|
but it still defines ``<lowercaseName>_BINARY_DIR`` to point inside its own
|
|
build area. Developers are strongly encouraged to use this mechanism rather
|
|
than editing the sources populated in the default location, as changes to
|
|
sources in the default location can be lost when content population details
|
|
are changed by the project.
|
|
|
|
.. variable:: FETCHCONTENT_UPDATES_DISCONNECTED_<uppercaseName>
|
|
|
|
This is the per-content equivalent of
|
|
:variable:`FETCHCONTENT_UPDATES_DISCONNECTED`. If the global option or
|
|
this option is ``ON``, then updates will be disabled for the named content.
|
|
Disabling updates for individual content can be useful for content whose
|
|
details rarely change, while still leaving other frequently changing content
|
|
with updates enabled.
|
|
|
|
.. _`fetch-content-examples`:
|
|
|
|
Examples
|
|
^^^^^^^^
|
|
|
|
Typical Case
|
|
""""""""""""
|
|
|
|
This first fairly straightforward example ensures that some popular testing
|
|
frameworks are available to the main build:
|
|
|
|
.. code-block:: cmake
|
|
|
|
include(FetchContent)
|
|
FetchContent_Declare(
|
|
googletest
|
|
GIT_REPOSITORY https://github.com/google/googletest.git
|
|
GIT_TAG 703bd9caab50b139428cea1aaff9974ebee5742e # release-1.10.0
|
|
)
|
|
FetchContent_Declare(
|
|
Catch2
|
|
GIT_REPOSITORY https://github.com/catchorg/Catch2.git
|
|
GIT_TAG de6fe184a9ac1a06895cdd1c9b437f0a0bdf14ad # v2.13.4
|
|
)
|
|
|
|
# After the following call, the CMake targets defined by googletest and
|
|
# Catch2 will be available to the rest of the build
|
|
FetchContent_MakeAvailable(googletest Catch2)
|
|
|
|
.. _FetchContent-find_package-integration-examples:
|
|
|
|
Integrating With find_package()
|
|
"""""""""""""""""""""""""""""""
|
|
|
|
For the previous example, if the user wanted to try to find ``googletest``
|
|
and ``Catch2`` via :command:`find_package` first before trying to download
|
|
and build them from source, they could set the
|
|
:variable:`FETCHCONTENT_TRY_FIND_PACKAGE_MODE` variable to ``ALWAYS``.
|
|
This would also affect any other calls to :command:`FetchContent_Declare`
|
|
throughout the project, which might not be acceptable. The behavior can be
|
|
enabled for just these two dependencies instead by adding ``FIND_PACKAGE_ARGS``
|
|
to the declared details and leaving
|
|
:variable:`FETCHCONTENT_TRY_FIND_PACKAGE_MODE` unset, or set to ``OPT_IN``:
|
|
|
|
.. code-block:: cmake
|
|
|
|
include(FetchContent)
|
|
FetchContent_Declare(
|
|
googletest
|
|
GIT_REPOSITORY https://github.com/google/googletest.git
|
|
GIT_TAG 703bd9caab50b139428cea1aaff9974ebee5742e # release-1.10.0
|
|
FIND_PACKAGE_ARGS NAMES GTest
|
|
)
|
|
FetchContent_Declare(
|
|
Catch2
|
|
GIT_REPOSITORY https://github.com/catchorg/Catch2.git
|
|
GIT_TAG de6fe184a9ac1a06895cdd1c9b437f0a0bdf14ad # v2.13.4
|
|
FIND_PACKAGE_ARGS
|
|
)
|
|
|
|
# This will try calling find_package() first for both dependencies
|
|
FetchContent_MakeAvailable(googletest Catch2)
|
|
|
|
For ``Catch2``, no additional arguments to :command:`find_package` are needed,
|
|
so no additional arguments are provided after the ``FIND_PACKAGE_ARGS``
|
|
keyword. For ``googletest``, its package is more commonly called ``GTest``,
|
|
so arguments are added to support it being found by that name.
|
|
|
|
If the user wanted to disable :command:`FetchContent_MakeAvailable` from
|
|
calling :command:`find_package` for any dependency, even if it provided
|
|
``FIND_PACKAGE_ARGS`` in its declared details, they could set
|
|
:variable:`FETCHCONTENT_TRY_FIND_PACKAGE_MODE` to ``NEVER``.
|
|
|
|
If the project wanted to indicate that these two dependencies should be
|
|
downloaded and built from source and that :command:`find_package` calls
|
|
should be redirected to use the built dependencies, the
|
|
``OVERRIDE_FIND_PACKAGE`` option should be used when declaring the content
|
|
details:
|
|
|
|
.. code-block:: cmake
|
|
|
|
include(FetchContent)
|
|
FetchContent_Declare(
|
|
googletest
|
|
GIT_REPOSITORY https://github.com/google/googletest.git
|
|
GIT_TAG 703bd9caab50b139428cea1aaff9974ebee5742e # release-1.10.0
|
|
OVERRIDE_FIND_PACKAGE
|
|
)
|
|
FetchContent_Declare(
|
|
Catch2
|
|
GIT_REPOSITORY https://github.com/catchorg/Catch2.git
|
|
GIT_TAG de6fe184a9ac1a06895cdd1c9b437f0a0bdf14ad # v2.13.4
|
|
OVERRIDE_FIND_PACKAGE
|
|
)
|
|
|
|
# The following will automatically forward through to FetchContent_MakeAvailable()
|
|
find_package(googletest)
|
|
find_package(Catch2)
|
|
|
|
CMake provides a FindGTest module which defines some variables that older
|
|
projects may use instead of linking to the imported targets. To support
|
|
those cases, we can provide an extra file. In keeping with the
|
|
"first to define, wins" philosophy of ``FetchContent``, we only write out
|
|
that file if something else hasn't already done so.
|
|
|
|
.. code-block:: cmake
|
|
|
|
FetchContent_MakeAvailable(googletest)
|
|
|
|
if(NOT EXISTS ${CMAKE_FIND_PACKAGE_REDIRECTS_DIR}/googletest-extra.cmake AND
|
|
NOT EXISTS ${CMAKE_FIND_PACKAGE_REDIRECTS_DIR}/googletestExtra.cmake)
|
|
file(WRITE ${CMAKE_FIND_PACKAGE_REDIRECTS_DIR}/googletest-extra.cmake
|
|
[=[
|
|
if("${GTEST_LIBRARIES}" STREQUAL "" AND TARGET GTest::gtest)
|
|
set(GTEST_LIBRARIES GTest::gtest)
|
|
endif()
|
|
if("${GTEST_MAIN_LIBRARIES}" STREQUAL "" AND TARGET GTest::gtest_main)
|
|
set(GTEST_MAIN_LIBRARIES GTest::gtest_main)
|
|
endif()
|
|
if("${GTEST_BOTH_LIBRARIES}" STREQUAL "")
|
|
set(GTEST_BOTH_LIBRARIES ${GTEST_LIBRARIES} ${GTEST_MAIN_LIBRARIES})
|
|
endif()
|
|
]=])
|
|
endif()
|
|
|
|
Projects will also likely be using ``find_package(GTest)`` rather than
|
|
``find_package(googletest)``, but it is possible to make use of the
|
|
:variable:`CMAKE_FIND_PACKAGE_REDIRECTS_DIR` area to pull in the latter as
|
|
a dependency of the former. This is likely to be sufficient to satisfy
|
|
a typical ``find_package(GTest)`` call.
|
|
|
|
.. code-block:: cmake
|
|
|
|
FetchContent_MakeAvailable(googletest)
|
|
|
|
if(NOT EXISTS ${CMAKE_FIND_PACKAGE_REDIRECTS_DIR}/gtest-config.cmake AND
|
|
NOT EXISTS ${CMAKE_FIND_PACKAGE_REDIRECTS_DIR}/GTestConfig.cmake)
|
|
file(WRITE ${CMAKE_FIND_PACKAGE_REDIRECTS_DIR}/gtest-config.cmake
|
|
[=[
|
|
include(CMakeFindDependencyMacro)
|
|
find_dependency(googletest)
|
|
]=])
|
|
endif()
|
|
|
|
if(NOT EXISTS ${CMAKE_FIND_PACKAGE_REDIRECTS_DIR}/gtest-config-version.cmake AND
|
|
NOT EXISTS ${CMAKE_FIND_PACKAGE_REDIRECTS_DIR}/GTestConfigVersion.cmake)
|
|
file(WRITE ${CMAKE_FIND_PACKAGE_REDIRECTS_DIR}/gtest-config-version.cmake
|
|
[=[
|
|
include(${CMAKE_FIND_PACKAGE_REDIRECTS_DIR}/googletest-config-version.cmake OPTIONAL)
|
|
if(NOT PACKAGE_VERSION_COMPATIBLE)
|
|
include(${CMAKE_FIND_PACKAGE_REDIRECTS_DIR}/googletestConfigVersion.cmake OPTIONAL)
|
|
endif()
|
|
]=])
|
|
endif()
|
|
|
|
Overriding Where To Find CMakeLists.txt
|
|
"""""""""""""""""""""""""""""""""""""""
|
|
|
|
If the sub-project's ``CMakeLists.txt`` file is not at the top level of its
|
|
source tree, the ``SOURCE_SUBDIR`` option can be used to tell ``FetchContent``
|
|
where to find it. The following example shows how to use that option, and
|
|
it also sets a variable which is meaningful to the subproject before pulling
|
|
it into the main build (set as an ``INTERNAL`` cache variable to avoid
|
|
problems with policy :policy:`CMP0077`):
|
|
|
|
.. code-block:: cmake
|
|
|
|
include(FetchContent)
|
|
FetchContent_Declare(
|
|
protobuf
|
|
GIT_REPOSITORY https://github.com/protocolbuffers/protobuf.git
|
|
GIT_TAG ae50d9b9902526efd6c7a1907d09739f959c6297 # v3.15.0
|
|
SOURCE_SUBDIR cmake
|
|
)
|
|
set(protobuf_BUILD_TESTS OFF CACHE INTERNAL "")
|
|
FetchContent_MakeAvailable(protobuf)
|
|
|
|
Complex Dependency Hierarchies
|
|
""""""""""""""""""""""""""""""
|
|
|
|
In more complex project hierarchies, the dependency relationships can be more
|
|
complicated. Consider a hierarchy where ``projA`` is the top level project and
|
|
it depends directly on projects ``projB`` and ``projC``. Both ``projB`` and
|
|
``projC`` can be built standalone and they also both depend on another project
|
|
``projD``. ``projB`` additionally depends on ``projE``. This example assumes
|
|
that all five projects are available on a company git server. The
|
|
``CMakeLists.txt`` of each project might have sections like the following:
|
|
|
|
*projA*:
|
|
|
|
.. code-block:: cmake
|
|
|
|
include(FetchContent)
|
|
FetchContent_Declare(
|
|
projB
|
|
GIT_REPOSITORY git@mycompany.com:git/projB.git
|
|
GIT_TAG 4a89dc7e24ff212a7b5167bef7ab079d
|
|
)
|
|
FetchContent_Declare(
|
|
projC
|
|
GIT_REPOSITORY git@mycompany.com:git/projC.git
|
|
GIT_TAG 4ad4016bd1d8d5412d135cf8ceea1bb9
|
|
)
|
|
FetchContent_Declare(
|
|
projD
|
|
GIT_REPOSITORY git@mycompany.com:git/projD.git
|
|
GIT_TAG origin/integrationBranch
|
|
)
|
|
FetchContent_Declare(
|
|
projE
|
|
GIT_REPOSITORY git@mycompany.com:git/projE.git
|
|
GIT_TAG v2.3-rc1
|
|
)
|
|
|
|
# Order is important, see notes in the discussion further below
|
|
FetchContent_MakeAvailable(projD projB projC)
|
|
|
|
*projB*:
|
|
|
|
.. code-block:: cmake
|
|
|
|
include(FetchContent)
|
|
FetchContent_Declare(
|
|
projD
|
|
GIT_REPOSITORY git@mycompany.com:git/projD.git
|
|
GIT_TAG 20b415f9034bbd2a2e8216e9a5c9e632
|
|
)
|
|
FetchContent_Declare(
|
|
projE
|
|
GIT_REPOSITORY git@mycompany.com:git/projE.git
|
|
GIT_TAG 68e20f674a48be38d60e129f600faf7d
|
|
)
|
|
|
|
FetchContent_MakeAvailable(projD projE)
|
|
|
|
*projC*:
|
|
|
|
.. code-block:: cmake
|
|
|
|
include(FetchContent)
|
|
FetchContent_Declare(
|
|
projD
|
|
GIT_REPOSITORY git@mycompany.com:git/projD.git
|
|
GIT_TAG 7d9a17ad2c962aa13e2fbb8043fb6b8a
|
|
)
|
|
|
|
# This particular version of projD requires workarounds
|
|
FetchContent_GetProperties(projD)
|
|
if(NOT projd_POPULATED)
|
|
FetchContent_Populate(projD)
|
|
|
|
# Copy an additional/replacement file into the populated source
|
|
file(COPY someFile.c DESTINATION ${projd_SOURCE_DIR}/src)
|
|
|
|
add_subdirectory(${projd_SOURCE_DIR} ${projd_BINARY_DIR})
|
|
endif()
|
|
|
|
A few key points should be noted in the above:
|
|
|
|
- ``projB`` and ``projC`` define different content details for ``projD``,
|
|
but ``projA`` also defines a set of content details for ``projD``.
|
|
Because ``projA`` will define them first, the details from ``projB`` and
|
|
``projC`` will not be used. The override details defined by ``projA``
|
|
are not required to match either of those from ``projB`` or ``projC``, but
|
|
it is up to the higher level project to ensure that the details it does
|
|
define still make sense for the child projects.
|
|
- In the ``projA`` call to :command:`FetchContent_MakeAvailable`, ``projD``
|
|
is listed ahead of ``projB`` and ``projC`` to ensure that ``projA`` is in
|
|
control of how ``projD`` is populated.
|
|
- While ``projA`` defines content details for ``projE``, it does not need
|
|
to explicitly call ``FetchContent_MakeAvailable(projE)`` or
|
|
``FetchContent_Populate(projD)`` itself. Instead, it leaves that to the
|
|
child ``projB``. For higher level projects, it is often enough to just
|
|
define the override content details and leave the actual population to the
|
|
child projects. This saves repeating the same thing at each level of the
|
|
project hierarchy unnecessarily.
|
|
|
|
Populating Content Without Adding It To The Build
|
|
"""""""""""""""""""""""""""""""""""""""""""""""""
|
|
|
|
Projects don't always need to add the populated content to the build.
|
|
Sometimes the project just wants to make the downloaded content available at
|
|
a predictable location. The next example ensures that a set of standard
|
|
company toolchain files (and potentially even the toolchain binaries
|
|
themselves) is available early enough to be used for that same build.
|
|
|
|
.. code-block:: cmake
|
|
|
|
cmake_minimum_required(VERSION 3.14)
|
|
|
|
include(FetchContent)
|
|
FetchContent_Declare(
|
|
mycom_toolchains
|
|
URL https://intranet.mycompany.com//toolchains_1.3.2.tar.gz
|
|
)
|
|
FetchContent_MakeAvailable(mycom_toolchains)
|
|
|
|
project(CrossCompileExample)
|
|
|
|
The project could be configured to use one of the downloaded toolchains like
|
|
so:
|
|
|
|
.. code-block:: shell
|
|
|
|
cmake -DCMAKE_TOOLCHAIN_FILE=_deps/mycom_toolchains-src/toolchain_arm.cmake /path/to/src
|
|
|
|
When CMake processes the ``CMakeLists.txt`` file, it will download and unpack
|
|
the tarball into ``_deps/mycompany_toolchains-src`` relative to the build
|
|
directory. The :variable:`CMAKE_TOOLCHAIN_FILE` variable is not used until
|
|
the :command:`project` command is reached, at which point CMake looks for the
|
|
named toolchain file relative to the build directory. Because the tarball has
|
|
already been downloaded and unpacked by then, the toolchain file will be in
|
|
place, even the very first time that ``cmake`` is run in the build directory.
|
|
|
|
Populating Content In CMake Script Mode
|
|
"""""""""""""""""""""""""""""""""""""""
|
|
|
|
This last example demonstrates how one might download and unpack a
|
|
firmware tarball using CMake's :manual:`script mode <cmake(1)>`. The call to
|
|
:command:`FetchContent_Populate` specifies all the content details and the
|
|
unpacked firmware will be placed in a ``firmware`` directory below the
|
|
current working directory.
|
|
|
|
*getFirmware.cmake*:
|
|
|
|
.. code-block:: cmake
|
|
|
|
# NOTE: Intended to be run in script mode with cmake -P
|
|
include(FetchContent)
|
|
FetchContent_Populate(
|
|
firmware
|
|
URL https://mycompany.com/assets/firmware-1.23-arm.tar.gz
|
|
URL_HASH MD5=68247684da89b608d466253762b0ff11
|
|
SOURCE_DIR firmware
|
|
)
|
|
|
|
#]=======================================================================]
|
|
|
|
#=======================================================================
|
|
# Recording and retrieving content details for later population
|
|
#=======================================================================
|
|
|
|
# Internal use, projects must not call this directly. It is
|
|
# intended for use by FetchContent_Declare() only.
|
|
#
|
|
# Sets a content-specific global property (not meant for use
|
|
# outside of functions defined here in this file) which can later
|
|
# be retrieved using __FetchContent_getSavedDetails() with just the
|
|
# same content name. If there is already a value stored in the
|
|
# property, it is left unchanged and this call has no effect.
|
|
# This allows parent projects to define the content details,
|
|
# overriding anything a child project may try to set (properties
|
|
# are not cached between runs, so the first thing to set it in a
|
|
# build will be in control).
|
|
function(__FetchContent_declareDetails contentName)
|
|
|
|
string(TOLOWER ${contentName} contentNameLower)
|
|
set(savedDetailsPropertyName "_FetchContent_${contentNameLower}_savedDetails")
|
|
get_property(alreadyDefined GLOBAL PROPERTY ${savedDetailsPropertyName} DEFINED)
|
|
if(alreadyDefined)
|
|
return()
|
|
endif()
|
|
|
|
if("${FETCHCONTENT_TRY_FIND_PACKAGE_MODE}" STREQUAL "ALWAYS")
|
|
set(__tryFindPackage TRUE)
|
|
set(__tryFindPackageAllowed TRUE)
|
|
elseif("${FETCHCONTENT_TRY_FIND_PACKAGE_MODE}" STREQUAL "NEVER")
|
|
set(__tryFindPackage FALSE)
|
|
set(__tryFindPackageAllowed FALSE)
|
|
elseif("${FETCHCONTENT_TRY_FIND_PACKAGE_MODE}" STREQUAL "OPT_IN" OR
|
|
NOT DEFINED FETCHCONTENT_TRY_FIND_PACKAGE_MODE)
|
|
set(__tryFindPackage FALSE)
|
|
set(__tryFindPackageAllowed TRUE)
|
|
else()
|
|
message(FATAL_ERROR
|
|
"Unsupported value for FETCHCONTENT_TRY_FIND_PACKAGE_MODE: "
|
|
"${FETCHCONTENT_TRY_FIND_PACKAGE_MODE}"
|
|
)
|
|
endif()
|
|
|
|
set(__cmdArgs)
|
|
set(__findPackageArgs)
|
|
set(__sawQuietKeyword NO)
|
|
set(__sawGlobalKeyword NO)
|
|
foreach(__item IN LISTS ARGN)
|
|
if(DEFINED __findPackageArgs)
|
|
# All remaining args are for find_package()
|
|
string(APPEND __findPackageArgs " [==[${__item}]==]")
|
|
if(__item STREQUAL "QUIET")
|
|
set(__sawQuietKeyword YES)
|
|
elseif(__item STREQUAL "GLOBAL")
|
|
set(__sawGlobalKeyword YES)
|
|
endif()
|
|
continue()
|
|
endif()
|
|
|
|
# Still processing non-find_package() args
|
|
if(__item STREQUAL "FIND_PACKAGE_ARGS")
|
|
if(__tryFindPackageAllowed)
|
|
set(__tryFindPackage TRUE)
|
|
endif()
|
|
# All arguments after this keyword are for find_package(). Define the
|
|
# variable but with an empty value initially. This allows us to check
|
|
# at the start of the loop whether to store remaining items in this
|
|
# variable or not. Note that there could be no more args, which is still
|
|
# a valid case because we automatically provide ${contentName} as the
|
|
# package name and there may not need to be any further arguments.
|
|
set(__findPackageArgs "")
|
|
continue() # Don't store this item
|
|
elseif(__item STREQUAL "OVERRIDE_FIND_PACKAGE")
|
|
set(__tryFindPackageAllowed FALSE)
|
|
# Define a separate dedicated property for find_package() to check
|
|
# in its implementation. This will be a placeholder until FetchContent
|
|
# actually does the population. After that, we will have created a
|
|
# stand-in config file that find_package() will pick up instead.
|
|
set(propertyName "_FetchContent_${contentNameLower}_override_find_package")
|
|
define_property(GLOBAL PROPERTY ${propertyName})
|
|
set_property(GLOBAL PROPERTY ${propertyName} TRUE)
|
|
endif()
|
|
|
|
string(APPEND __cmdArgs " [==[${__item}]==]")
|
|
endforeach()
|
|
|
|
define_property(GLOBAL PROPERTY ${savedDetailsPropertyName})
|
|
cmake_language(EVAL CODE
|
|
"set_property(GLOBAL PROPERTY ${savedDetailsPropertyName} ${__cmdArgs})"
|
|
)
|
|
|
|
if(__tryFindPackage AND __tryFindPackageAllowed)
|
|
set(propertyName "_FetchContent_${contentNameLower}_find_package_args")
|
|
define_property(GLOBAL PROPERTY ${propertyName})
|
|
if(NOT __sawQuietKeyword)
|
|
list(INSERT __findPackageArgs 0 QUIET)
|
|
endif()
|
|
if(CMAKE_FIND_PACKAGE_TARGETS_GLOBAL AND NOT __sawGlobalKeyword)
|
|
list(APPEND __findPackageArgs GLOBAL)
|
|
endif()
|
|
cmake_language(EVAL CODE
|
|
"set_property(GLOBAL PROPERTY ${propertyName} ${__findPackageArgs})"
|
|
)
|
|
endif()
|
|
|
|
endfunction()
|
|
|
|
|
|
# Internal use, projects must not call this directly. It is
|
|
# intended for use by the FetchContent_Declare() function.
|
|
#
|
|
# Retrieves details saved for the specified content in an
|
|
# earlier call to __FetchContent_declareDetails().
|
|
function(__FetchContent_getSavedDetails contentName outVar)
|
|
|
|
string(TOLOWER ${contentName} contentNameLower)
|
|
set(propertyName "_FetchContent_${contentNameLower}_savedDetails")
|
|
get_property(alreadyDefined GLOBAL PROPERTY ${propertyName} DEFINED)
|
|
if(NOT alreadyDefined)
|
|
message(FATAL_ERROR "No content details recorded for ${contentName}")
|
|
endif()
|
|
get_property(propertyValue GLOBAL PROPERTY ${propertyName})
|
|
set(${outVar} "${propertyValue}" PARENT_SCOPE)
|
|
|
|
endfunction()
|
|
|
|
|
|
# Saves population details of the content, sets defaults for the
|
|
# SOURCE_DIR and BUILD_DIR.
|
|
function(FetchContent_Declare contentName)
|
|
|
|
# Always check this even if we won't save these details.
|
|
# This helps projects catch errors earlier.
|
|
# Avoid using if(... IN_LIST ...) so we don't have to alter policy settings
|
|
list(FIND ARGN OVERRIDE_FIND_PACKAGE index_OVERRIDE_FIND_PACKAGE)
|
|
list(FIND ARGN FIND_PACKAGE_ARGS index_FIND_PACKAGE_ARGS)
|
|
if(index_OVERRIDE_FIND_PACKAGE GREATER_EQUAL 0 AND
|
|
index_FIND_PACKAGE_ARGS GREATER_EQUAL 0)
|
|
message(FATAL_ERROR
|
|
"Cannot specify both OVERRIDE_FIND_PACKAGE and FIND_PACKAGE_ARGS "
|
|
"when declaring details for ${contentName}"
|
|
)
|
|
endif()
|
|
|
|
# Because we are only looking for a subset of the supported keywords, we
|
|
# cannot check for multi-value arguments with this method. We will have to
|
|
# handle the URL keyword differently.
|
|
set(oneValueArgs
|
|
SVN_REPOSITORY
|
|
DOWNLOAD_NO_EXTRACT
|
|
DOWNLOAD_EXTRACT_TIMESTAMP
|
|
BINARY_DIR
|
|
SOURCE_DIR
|
|
)
|
|
|
|
cmake_parse_arguments(PARSE_ARGV 1 ARG "" "${oneValueArgs}" "")
|
|
|
|
string(TOLOWER ${contentName} contentNameLower)
|
|
|
|
if(NOT ARG_BINARY_DIR)
|
|
set(ARG_BINARY_DIR "${FETCHCONTENT_BASE_DIR}/${contentNameLower}-build")
|
|
endif()
|
|
|
|
if(NOT ARG_SOURCE_DIR)
|
|
set(ARG_SOURCE_DIR "${FETCHCONTENT_BASE_DIR}/${contentNameLower}-src")
|
|
endif()
|
|
|
|
if(ARG_SVN_REPOSITORY)
|
|
# Add a hash of the svn repository URL to the source dir. This works
|
|
# around the problem where if the URL changes, the download would
|
|
# fail because it tries to checkout/update rather than switch the
|
|
# old URL to the new one. We limit the hash to the first 7 characters
|
|
# so that the source path doesn't get overly long (which can be a
|
|
# problem on windows due to path length limits).
|
|
string(SHA1 urlSHA ${ARG_SVN_REPOSITORY})
|
|
string(SUBSTRING ${urlSHA} 0 7 urlSHA)
|
|
string(APPEND ARG_SOURCE_DIR "-${urlSHA}")
|
|
endif()
|
|
|
|
# The ExternalProject_Add() call in the sub-build won't see the CMP0135
|
|
# policy setting of our caller. Work out if that policy will be needed and
|
|
# explicitly set the relevant option if not already provided. The condition
|
|
# here is essentially an abbreviated version of the logic in
|
|
# ExternalProject's _ep_add_download_command() function.
|
|
if(NOT ARG_DOWNLOAD_NO_EXTRACT AND
|
|
NOT DEFINED ARG_DOWNLOAD_EXTRACT_TIMESTAMP)
|
|
list(FIND ARGN URL urlIndex)
|
|
if(urlIndex GREATER_EQUAL 0)
|
|
math(EXPR urlIndex "${urlIndex} + 1")
|
|
list(LENGTH ARGN numArgs)
|
|
if(urlIndex GREATER_EQUAL numArgs)
|
|
message(FATAL_ERROR
|
|
"URL keyword needs to be followed by at least one URL"
|
|
)
|
|
endif()
|
|
# If we have multiple URLs, none of them are allowed to be local paths.
|
|
# Therefore, we can test just the first URL, and if it is non-local, so
|
|
# will be the others if there are more.
|
|
list(GET ARGN ${urlIndex} firstUrl)
|
|
if(NOT IS_DIRECTORY "${firstUrl}")
|
|
cmake_policy(GET CMP0135 _FETCHCONTENT_CMP0135
|
|
PARENT_SCOPE # undocumented, do not use outside of CMake
|
|
)
|
|
if(_FETCHCONTENT_CMP0135 STREQUAL "")
|
|
message(AUTHOR_WARNING
|
|
"The DOWNLOAD_EXTRACT_TIMESTAMP option was not given and policy "
|
|
"CMP0135 is not set. The policy's OLD behavior will be used. "
|
|
"When using a URL download, the timestamps of extracted files "
|
|
"should preferably be that of the time of extraction, otherwise "
|
|
"code that depends on the extracted contents might not be "
|
|
"rebuilt if the URL changes. The OLD behavior preserves the "
|
|
"timestamps from the archive instead, but this is usually not "
|
|
"what you want. Update your project to the NEW behavior or "
|
|
"specify the DOWNLOAD_EXTRACT_TIMESTAMP option with a value of "
|
|
"true to avoid this robustness issue."
|
|
)
|
|
set(ARG_DOWNLOAD_EXTRACT_TIMESTAMP TRUE)
|
|
elseif(_FETCHCONTENT_CMP0135 STREQUAL "NEW")
|
|
set(ARG_DOWNLOAD_EXTRACT_TIMESTAMP FALSE)
|
|
else()
|
|
set(ARG_DOWNLOAD_EXTRACT_TIMESTAMP TRUE)
|
|
endif()
|
|
endif()
|
|
endif()
|
|
endif()
|
|
|
|
# Add back in the keyword args we pulled out and potentially tweaked/added
|
|
foreach(key IN LISTS oneValueArgs)
|
|
if(DEFINED ARG_${key})
|
|
list(PREPEND ARG_UNPARSED_ARGUMENTS ${key} "${ARG_${key}}")
|
|
endif()
|
|
endforeach()
|
|
|
|
set(__argsQuoted)
|
|
foreach(__item IN LISTS ARG_UNPARSED_ARGUMENTS)
|
|
string(APPEND __argsQuoted " [==[${__item}]==]")
|
|
endforeach()
|
|
cmake_language(EVAL CODE
|
|
"__FetchContent_declareDetails(${contentNameLower} ${__argsQuoted})"
|
|
)
|
|
|
|
endfunction()
|
|
|
|
|
|
#=======================================================================
|
|
# Set/get whether the specified content has been populated yet.
|
|
# The setter also records the source and binary dirs used.
|
|
#=======================================================================
|
|
|
|
# Semi-internal use. Projects must not call this directly. Dependency
|
|
# providers must call it if they satisfy a request made with the
|
|
# FETCHCONTENT_MAKEAVAILABLE_SERIAL method (that is the only permitted
|
|
# place to call it outside of the FetchContent module).
|
|
function(FetchContent_SetPopulated contentName)
|
|
|
|
cmake_parse_arguments(PARSE_ARGV 1 arg
|
|
""
|
|
"SOURCE_DIR;BINARY_DIR"
|
|
""
|
|
)
|
|
if(NOT "${arg_UNPARSED_ARGUMENTS}" STREQUAL "")
|
|
message(FATAL_ERROR "Unsupported arguments: ${arg_UNPARSED_ARGUMENTS}")
|
|
endif()
|
|
|
|
string(TOLOWER ${contentName} contentNameLower)
|
|
set(prefix "_FetchContent_${contentNameLower}")
|
|
|
|
set(propertyName "${prefix}_sourceDir")
|
|
define_property(GLOBAL PROPERTY ${propertyName})
|
|
if("${arg_SOURCE_DIR}" STREQUAL "")
|
|
# Don't discard a previously provided SOURCE_DIR
|
|
get_property(arg_SOURCE_DIR GLOBAL PROPERTY ${propertyName})
|
|
endif()
|
|
set_property(GLOBAL PROPERTY ${propertyName} "${arg_SOURCE_DIR}")
|
|
|
|
set(propertyName "${prefix}_binaryDir")
|
|
define_property(GLOBAL PROPERTY ${propertyName})
|
|
if("${arg_BINARY_DIR}" STREQUAL "")
|
|
# Don't discard a previously provided BINARY_DIR
|
|
get_property(arg_BINARY_DIR GLOBAL PROPERTY ${propertyName})
|
|
endif()
|
|
set_property(GLOBAL PROPERTY ${propertyName} "${arg_BINARY_DIR}")
|
|
|
|
set(propertyName "${prefix}_populated")
|
|
define_property(GLOBAL PROPERTY ${propertyName})
|
|
set_property(GLOBAL PROPERTY ${propertyName} TRUE)
|
|
|
|
endfunction()
|
|
|
|
|
|
# Set variables in the calling scope for any of the retrievable
|
|
# properties. If no specific properties are requested, variables
|
|
# will be set for all retrievable properties.
|
|
#
|
|
# This function is intended to also be used by projects as the canonical
|
|
# way to detect whether they should call FetchContent_Populate()
|
|
# and pull the populated source into the build with add_subdirectory(),
|
|
# if they are using the populated content in that way.
|
|
function(FetchContent_GetProperties contentName)
|
|
|
|
string(TOLOWER ${contentName} contentNameLower)
|
|
|
|
set(options "")
|
|
set(oneValueArgs SOURCE_DIR BINARY_DIR POPULATED)
|
|
set(multiValueArgs "")
|
|
|
|
cmake_parse_arguments(ARG "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
|
|
|
|
if(NOT ARG_SOURCE_DIR AND
|
|
NOT ARG_BINARY_DIR AND
|
|
NOT ARG_POPULATED)
|
|
# No specific properties requested, provide them all
|
|
set(ARG_SOURCE_DIR ${contentNameLower}_SOURCE_DIR)
|
|
set(ARG_BINARY_DIR ${contentNameLower}_BINARY_DIR)
|
|
set(ARG_POPULATED ${contentNameLower}_POPULATED)
|
|
endif()
|
|
|
|
set(prefix "_FetchContent_${contentNameLower}")
|
|
|
|
if(ARG_SOURCE_DIR)
|
|
set(propertyName "${prefix}_sourceDir")
|
|
get_property(value GLOBAL PROPERTY ${propertyName})
|
|
if(value)
|
|
set(${ARG_SOURCE_DIR} ${value} PARENT_SCOPE)
|
|
endif()
|
|
endif()
|
|
|
|
if(ARG_BINARY_DIR)
|
|
set(propertyName "${prefix}_binaryDir")
|
|
get_property(value GLOBAL PROPERTY ${propertyName})
|
|
if(value)
|
|
set(${ARG_BINARY_DIR} ${value} PARENT_SCOPE)
|
|
endif()
|
|
endif()
|
|
|
|
if(ARG_POPULATED)
|
|
set(propertyName "${prefix}_populated")
|
|
get_property(value GLOBAL PROPERTY ${propertyName} DEFINED)
|
|
set(${ARG_POPULATED} ${value} PARENT_SCOPE)
|
|
endif()
|
|
|
|
endfunction()
|
|
|
|
|
|
#=======================================================================
|
|
# Performing the population
|
|
#=======================================================================
|
|
|
|
# The value of contentName will always have been lowercased by the caller.
|
|
# All other arguments are assumed to be options that are understood by
|
|
# ExternalProject_Add(), except for QUIET and SUBBUILD_DIR.
|
|
function(__FetchContent_directPopulate contentName)
|
|
|
|
set(options
|
|
QUIET
|
|
)
|
|
set(oneValueArgs
|
|
SUBBUILD_DIR
|
|
SOURCE_DIR
|
|
BINARY_DIR
|
|
# We need special processing if DOWNLOAD_NO_EXTRACT is true
|
|
DOWNLOAD_NO_EXTRACT
|
|
# Prevent the following from being passed through
|
|
CONFIGURE_COMMAND
|
|
BUILD_COMMAND
|
|
INSTALL_COMMAND
|
|
TEST_COMMAND
|
|
# We force these to be ON since we are always executing serially
|
|
# and we want all steps to have access to the terminal in case they
|
|
# need input from the command line (e.g. ask for a private key password)
|
|
# or they want to provide timely progress. We silently absorb and
|
|
# discard these if they are set by the caller.
|
|
USES_TERMINAL_DOWNLOAD
|
|
USES_TERMINAL_UPDATE
|
|
USES_TERMINAL_PATCH
|
|
)
|
|
set(multiValueArgs "")
|
|
|
|
cmake_parse_arguments(PARSE_ARGV 1 ARG
|
|
"${options}" "${oneValueArgs}" "${multiValueArgs}")
|
|
|
|
if(NOT ARG_SUBBUILD_DIR)
|
|
message(FATAL_ERROR "Internal error: SUBBUILD_DIR not set")
|
|
elseif(NOT IS_ABSOLUTE "${ARG_SUBBUILD_DIR}")
|
|
set(ARG_SUBBUILD_DIR "${CMAKE_CURRENT_BINARY_DIR}/${ARG_SUBBUILD_DIR}")
|
|
endif()
|
|
|
|
if(NOT ARG_SOURCE_DIR)
|
|
message(FATAL_ERROR "Internal error: SOURCE_DIR not set")
|
|
elseif(NOT IS_ABSOLUTE "${ARG_SOURCE_DIR}")
|
|
set(ARG_SOURCE_DIR "${CMAKE_CURRENT_BINARY_DIR}/${ARG_SOURCE_DIR}")
|
|
endif()
|
|
|
|
if(NOT ARG_BINARY_DIR)
|
|
message(FATAL_ERROR "Internal error: BINARY_DIR not set")
|
|
elseif(NOT IS_ABSOLUTE "${ARG_BINARY_DIR}")
|
|
set(ARG_BINARY_DIR "${CMAKE_CURRENT_BINARY_DIR}/${ARG_BINARY_DIR}")
|
|
endif()
|
|
|
|
# Ensure the caller can know where to find the source and build directories
|
|
# with some convenient variables. Doing this here ensures the caller sees
|
|
# the correct result in the case where the default values are overridden by
|
|
# the content details set by the project.
|
|
set(${contentName}_SOURCE_DIR "${ARG_SOURCE_DIR}" PARENT_SCOPE)
|
|
set(${contentName}_BINARY_DIR "${ARG_BINARY_DIR}" PARENT_SCOPE)
|
|
|
|
# The unparsed arguments may contain spaces, so build up ARG_EXTRA
|
|
# in such a way that it correctly substitutes into the generated
|
|
# CMakeLists.txt file with each argument quoted.
|
|
unset(ARG_EXTRA)
|
|
foreach(arg IN LISTS ARG_UNPARSED_ARGUMENTS)
|
|
set(ARG_EXTRA "${ARG_EXTRA} \"${arg}\"")
|
|
endforeach()
|
|
|
|
if(ARG_DOWNLOAD_NO_EXTRACT)
|
|
set(ARG_EXTRA "${ARG_EXTRA} DOWNLOAD_NO_EXTRACT YES")
|
|
set(__FETCHCONTENT_COPY_FILE
|
|
"
|
|
ExternalProject_Get_Property(${contentName}-populate DOWNLOADED_FILE)
|
|
get_filename_component(dlFileName \"\${DOWNLOADED_FILE}\" NAME)
|
|
|
|
ExternalProject_Add_Step(${contentName}-populate copyfile
|
|
COMMAND \"${CMAKE_COMMAND}\" -E copy_if_different
|
|
\"<DOWNLOADED_FILE>\" \"${ARG_SOURCE_DIR}\"
|
|
DEPENDEES patch
|
|
DEPENDERS configure
|
|
BYPRODUCTS \"${ARG_SOURCE_DIR}/\${dlFileName}\"
|
|
COMMENT \"Copying file to SOURCE_DIR\"
|
|
)
|
|
")
|
|
else()
|
|
unset(__FETCHCONTENT_COPY_FILE)
|
|
endif()
|
|
|
|
# Hide output if requested, but save it to a variable in case there's an
|
|
# error so we can show the output upon failure. When not quiet, don't
|
|
# capture the output to a variable because the user may want to see the
|
|
# output as it happens (e.g. progress during long downloads). Combine both
|
|
# stdout and stderr in the one capture variable so the output stays in order.
|
|
if (ARG_QUIET)
|
|
set(outputOptions
|
|
OUTPUT_VARIABLE capturedOutput
|
|
ERROR_VARIABLE capturedOutput
|
|
)
|
|
else()
|
|
set(capturedOutput)
|
|
set(outputOptions)
|
|
message(STATUS "Populating ${contentName}")
|
|
endif()
|
|
|
|
if(CMAKE_GENERATOR)
|
|
set(subCMakeOpts "-G${CMAKE_GENERATOR}")
|
|
if(CMAKE_GENERATOR_PLATFORM)
|
|
list(APPEND subCMakeOpts "-A${CMAKE_GENERATOR_PLATFORM}")
|
|
endif()
|
|
if(CMAKE_GENERATOR_TOOLSET)
|
|
list(APPEND subCMakeOpts "-T${CMAKE_GENERATOR_TOOLSET}")
|
|
endif()
|
|
|
|
if(CMAKE_MAKE_PROGRAM)
|
|
list(APPEND subCMakeOpts "-DCMAKE_MAKE_PROGRAM:FILEPATH=${CMAKE_MAKE_PROGRAM}")
|
|
endif()
|
|
|
|
# Override the sub-build's configuration types for multi-config generators.
|
|
# This ensures we are not affected by any custom setting from the project
|
|
# and can always request a known configuration further below.
|
|
get_property(is_multi_config GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
|
|
if(is_multi_config)
|
|
list(APPEND subCMakeOpts "-DCMAKE_CONFIGURATION_TYPES:STRING=Debug")
|
|
endif()
|
|
|
|
else()
|
|
# Likely we've been invoked via CMake's script mode where no
|
|
# generator is set (and hence CMAKE_MAKE_PROGRAM could not be
|
|
# trusted even if provided). We will have to rely on being
|
|
# able to find the default generator and build tool.
|
|
unset(subCMakeOpts)
|
|
endif()
|
|
|
|
set(__FETCHCONTENT_CACHED_INFO "")
|
|
set(__passthrough_vars
|
|
CMAKE_EP_GIT_REMOTE_UPDATE_STRATEGY
|
|
CMAKE_TLS_VERIFY
|
|
CMAKE_TLS_CAINFO
|
|
CMAKE_NETRC
|
|
CMAKE_NETRC_FILE
|
|
)
|
|
foreach(var IN LISTS __passthrough_vars)
|
|
if(DEFINED ${var})
|
|
# Embed directly in the generated CMakeLists.txt file to avoid making
|
|
# the cmake command line excessively long. It also makes debugging and
|
|
# testing easier.
|
|
string(APPEND __FETCHCONTENT_CACHED_INFO "set(${var} [==[${${var}}]==])\n")
|
|
endif()
|
|
endforeach()
|
|
|
|
# Avoid using if(... IN_LIST ...) so we don't have to alter policy settings
|
|
list(FIND ARG_UNPARSED_ARGUMENTS GIT_REPOSITORY indexResult)
|
|
if(indexResult GREATER_EQUAL 0)
|
|
find_package(Git QUIET)
|
|
string(APPEND __FETCHCONTENT_CACHED_INFO "
|
|
# Pass through things we've already detected in the main project to avoid
|
|
# paying the cost of redetecting them again in ExternalProject_Add()
|
|
set(GIT_EXECUTABLE [==[${GIT_EXECUTABLE}]==])
|
|
set(GIT_VERSION_STRING [==[${GIT_VERSION_STRING}]==])
|
|
set_property(GLOBAL PROPERTY _CMAKE_FindGit_GIT_EXECUTABLE_VERSION
|
|
[==[${GIT_EXECUTABLE};${GIT_VERSION_STRING}]==]
|
|
)
|
|
")
|
|
endif()
|
|
|
|
# Create and build a separate CMake project to carry out the population.
|
|
# If we've already previously done these steps, they will not cause
|
|
# anything to be updated, so extra rebuilds of the project won't occur.
|
|
# Make sure to pass through CMAKE_MAKE_PROGRAM in case the main project
|
|
# has this set to something not findable on the PATH. We also ensured above
|
|
# that the Debug config will be defined for multi-config generators.
|
|
configure_file("${CMAKE_CURRENT_FUNCTION_LIST_DIR}/FetchContent/CMakeLists.cmake.in"
|
|
"${ARG_SUBBUILD_DIR}/CMakeLists.txt")
|
|
execute_process(
|
|
COMMAND ${CMAKE_COMMAND} ${subCMakeOpts} .
|
|
RESULT_VARIABLE result
|
|
${outputOptions}
|
|
WORKING_DIRECTORY "${ARG_SUBBUILD_DIR}"
|
|
)
|
|
if(result)
|
|
if(capturedOutput)
|
|
message("${capturedOutput}")
|
|
endif()
|
|
message(FATAL_ERROR "CMake step for ${contentName} failed: ${result}")
|
|
endif()
|
|
execute_process(
|
|
COMMAND ${CMAKE_COMMAND} --build . --config Debug
|
|
RESULT_VARIABLE result
|
|
${outputOptions}
|
|
WORKING_DIRECTORY "${ARG_SUBBUILD_DIR}"
|
|
)
|
|
if(result)
|
|
if(capturedOutput)
|
|
message("${capturedOutput}")
|
|
endif()
|
|
message(FATAL_ERROR "Build step for ${contentName} failed: ${result}")
|
|
endif()
|
|
|
|
endfunction()
|
|
|
|
|
|
option(FETCHCONTENT_FULLY_DISCONNECTED "Disables all attempts to download or update content and assumes source dirs already exist")
|
|
option(FETCHCONTENT_UPDATES_DISCONNECTED "Enables UPDATE_DISCONNECTED behavior for all content population")
|
|
option(FETCHCONTENT_QUIET "Enables QUIET option for all content population" ON)
|
|
set(FETCHCONTENT_BASE_DIR "${CMAKE_BINARY_DIR}/_deps" CACHE PATH "Directory under which to collect all populated content")
|
|
|
|
# Populate the specified content using details stored from
|
|
# an earlier call to FetchContent_Declare().
|
|
function(FetchContent_Populate contentName)
|
|
|
|
if(NOT contentName)
|
|
message(FATAL_ERROR "Empty contentName not allowed for FetchContent_Populate()")
|
|
endif()
|
|
|
|
string(TOLOWER ${contentName} contentNameLower)
|
|
|
|
if(ARGN)
|
|
# This is the direct population form with details fully specified
|
|
# as part of the call, so we already have everything we need
|
|
__FetchContent_directPopulate(
|
|
${contentNameLower}
|
|
SUBBUILD_DIR "${CMAKE_CURRENT_BINARY_DIR}/${contentNameLower}-subbuild"
|
|
SOURCE_DIR "${CMAKE_CURRENT_BINARY_DIR}/${contentNameLower}-src"
|
|
BINARY_DIR "${CMAKE_CURRENT_BINARY_DIR}/${contentNameLower}-build"
|
|
${ARGN} # Could override any of the above ..._DIR variables
|
|
)
|
|
|
|
# Pass source and binary dir variables back to the caller
|
|
set(${contentNameLower}_SOURCE_DIR "${${contentNameLower}_SOURCE_DIR}" PARENT_SCOPE)
|
|
set(${contentNameLower}_BINARY_DIR "${${contentNameLower}_BINARY_DIR}" PARENT_SCOPE)
|
|
|
|
# Don't set global properties, or record that we did this population, since
|
|
# this was a direct call outside of the normal declared details form.
|
|
# We only want to save values in the global properties for content that
|
|
# honors the hierarchical details mechanism so that projects are not
|
|
# robbed of the ability to override details set in nested projects.
|
|
return()
|
|
endif()
|
|
|
|
# No details provided, so assume they were saved from an earlier call
|
|
# to FetchContent_Declare(). Do a check that we haven't already
|
|
# populated this content before in case the caller forgot to check.
|
|
FetchContent_GetProperties(${contentName})
|
|
if(${contentNameLower}_POPULATED)
|
|
if("${${contentNameLower}_SOURCE_DIR}" STREQUAL "")
|
|
message(FATAL_ERROR
|
|
"Content ${contentName} already populated by find_package() or a "
|
|
"dependency provider"
|
|
)
|
|
else()
|
|
message(FATAL_ERROR
|
|
"Content ${contentName} already populated in ${${contentNameLower}_SOURCE_DIR}"
|
|
)
|
|
endif()
|
|
endif()
|
|
|
|
__FetchContent_getSavedDetails(${contentName} contentDetails)
|
|
if("${contentDetails}" STREQUAL "")
|
|
message(FATAL_ERROR "No details have been set for content: ${contentName}")
|
|
endif()
|
|
|
|
string(TOUPPER ${contentName} contentNameUpper)
|
|
set(FETCHCONTENT_SOURCE_DIR_${contentNameUpper}
|
|
"${FETCHCONTENT_SOURCE_DIR_${contentNameUpper}}"
|
|
CACHE PATH "When not empty, overrides where to find pre-populated content for ${contentName}")
|
|
|
|
if(FETCHCONTENT_SOURCE_DIR_${contentNameUpper})
|
|
# The source directory has been explicitly provided in the cache,
|
|
# so no population is required. The build directory may still be specified
|
|
# by the declared details though.
|
|
|
|
if(NOT IS_ABSOLUTE "${FETCHCONTENT_SOURCE_DIR_${contentNameUpper}}")
|
|
# Don't check this directory because we don't know what location it is
|
|
# expected to be relative to. We can't make this a hard error for backward
|
|
# compatibility reasons.
|
|
message(WARNING "Relative source directory specified. This is not safe, "
|
|
"as it depends on the calling directory scope.\n"
|
|
" FETCHCONTENT_SOURCE_DIR_${contentNameUpper} --> ${FETCHCONTENT_SOURCE_DIR_${contentNameUpper}}")
|
|
elseif(NOT EXISTS "${FETCHCONTENT_SOURCE_DIR_${contentNameUpper}}")
|
|
message(FATAL_ERROR "Manually specified source directory is missing:\n"
|
|
" FETCHCONTENT_SOURCE_DIR_${contentNameUpper} --> ${FETCHCONTENT_SOURCE_DIR_${contentNameUpper}}")
|
|
endif()
|
|
|
|
set(${contentNameLower}_SOURCE_DIR "${FETCHCONTENT_SOURCE_DIR_${contentNameUpper}}")
|
|
|
|
cmake_parse_arguments(savedDetails "" "BINARY_DIR" "" ${contentDetails})
|
|
|
|
if(savedDetails_BINARY_DIR)
|
|
set(${contentNameLower}_BINARY_DIR ${savedDetails_BINARY_DIR})
|
|
else()
|
|
set(${contentNameLower}_BINARY_DIR "${FETCHCONTENT_BASE_DIR}/${contentNameLower}-build")
|
|
endif()
|
|
|
|
elseif(FETCHCONTENT_FULLY_DISCONNECTED)
|
|
# Bypass population and assume source is already there from a previous run.
|
|
# Declared details may override the default source or build directories.
|
|
|
|
cmake_parse_arguments(savedDetails "" "SOURCE_DIR;BINARY_DIR" "" ${contentDetails})
|
|
|
|
if(savedDetails_SOURCE_DIR)
|
|
set(${contentNameLower}_SOURCE_DIR ${savedDetails_SOURCE_DIR})
|
|
else()
|
|
set(${contentNameLower}_SOURCE_DIR "${FETCHCONTENT_BASE_DIR}/${contentNameLower}-src")
|
|
endif()
|
|
|
|
if(savedDetails_BINARY_DIR)
|
|
set(${contentNameLower}_BINARY_DIR ${savedDetails_BINARY_DIR})
|
|
else()
|
|
set(${contentNameLower}_BINARY_DIR "${FETCHCONTENT_BASE_DIR}/${contentNameLower}-build")
|
|
endif()
|
|
|
|
else()
|
|
# Support both a global "disconnect all updates" and a per-content
|
|
# update test (either one being set disables updates for this content).
|
|
option(FETCHCONTENT_UPDATES_DISCONNECTED_${contentNameUpper}
|
|
"Enables UPDATE_DISCONNECTED behavior just for population of ${contentName}")
|
|
if(FETCHCONTENT_UPDATES_DISCONNECTED OR
|
|
FETCHCONTENT_UPDATES_DISCONNECTED_${contentNameUpper})
|
|
set(disconnectUpdates True)
|
|
else()
|
|
set(disconnectUpdates False)
|
|
endif()
|
|
|
|
if(FETCHCONTENT_QUIET)
|
|
set(quietFlag QUIET)
|
|
else()
|
|
unset(quietFlag)
|
|
endif()
|
|
|
|
set(__detailsQuoted)
|
|
foreach(__item IN LISTS contentDetails)
|
|
if(NOT __item STREQUAL "OVERRIDE_FIND_PACKAGE")
|
|
string(APPEND __detailsQuoted " [==[${__item}]==]")
|
|
endif()
|
|
endforeach()
|
|
cmake_language(EVAL CODE "
|
|
__FetchContent_directPopulate(
|
|
${contentNameLower}
|
|
${quietFlag}
|
|
UPDATE_DISCONNECTED ${disconnectUpdates}
|
|
SUBBUILD_DIR \"${FETCHCONTENT_BASE_DIR}/${contentNameLower}-subbuild\"
|
|
SOURCE_DIR \"${FETCHCONTENT_BASE_DIR}/${contentNameLower}-src\"
|
|
BINARY_DIR \"${FETCHCONTENT_BASE_DIR}/${contentNameLower}-build\"
|
|
# Put the saved details last so they can override any of the
|
|
# the options we set above (this can include SOURCE_DIR or
|
|
# BUILD_DIR)
|
|
${__detailsQuoted}
|
|
)"
|
|
)
|
|
endif()
|
|
|
|
FetchContent_SetPopulated(
|
|
${contentName}
|
|
SOURCE_DIR "${${contentNameLower}_SOURCE_DIR}"
|
|
BINARY_DIR "${${contentNameLower}_BINARY_DIR}"
|
|
)
|
|
|
|
# Pass variables back to the caller. The variables passed back here
|
|
# must match what FetchContent_GetProperties() sets when it is called
|
|
# with just the content name.
|
|
set(${contentNameLower}_SOURCE_DIR "${${contentNameLower}_SOURCE_DIR}" PARENT_SCOPE)
|
|
set(${contentNameLower}_BINARY_DIR "${${contentNameLower}_BINARY_DIR}" PARENT_SCOPE)
|
|
set(${contentNameLower}_POPULATED True PARENT_SCOPE)
|
|
|
|
endfunction()
|
|
|
|
function(__FetchContent_setupFindPackageRedirection contentName)
|
|
|
|
__FetchContent_getSavedDetails(${contentName} contentDetails)
|
|
|
|
string(TOLOWER ${contentName} contentNameLower)
|
|
get_property(wantFindPackage GLOBAL PROPERTY
|
|
_FetchContent_${contentNameLower}_find_package_args
|
|
DEFINED
|
|
)
|
|
|
|
# Avoid using if(... IN_LIST ...) so we don't have to alter policy settings
|
|
list(FIND contentDetails OVERRIDE_FIND_PACKAGE indexResult)
|
|
if(NOT wantFindPackage AND indexResult EQUAL -1)
|
|
# No find_package() redirection allowed
|
|
return()
|
|
endif()
|
|
|
|
# We write out dep-config.cmake and dep-config-version.cmake file name
|
|
# forms here because they are forced to lowercase. FetchContent
|
|
# dependency names are case-insensitive, but find_package() config files
|
|
# are only case-insensitive for the -config and -config-version forms,
|
|
# not the Config and ConfigVersion forms.
|
|
set(inFileDir ${CMAKE_CURRENT_FUNCTION_LIST_DIR}/FetchContent)
|
|
set(configFilePrefix1 "${CMAKE_FIND_PACKAGE_REDIRECTS_DIR}/${contentName}Config")
|
|
set(configFilePrefix2 "${CMAKE_FIND_PACKAGE_REDIRECTS_DIR}/${contentNameLower}-config")
|
|
if(NOT EXISTS "${configFilePrefix1}.cmake" AND
|
|
NOT EXISTS "${configFilePrefix2}.cmake")
|
|
configure_file(${inFileDir}/package-config.cmake.in
|
|
"${configFilePrefix2}.cmake" @ONLY
|
|
)
|
|
endif()
|
|
if(NOT EXISTS "${configFilePrefix1}Version.cmake" AND
|
|
NOT EXISTS "${configFilePrefix2}-version.cmake")
|
|
configure_file(${inFileDir}/package-config-version.cmake.in
|
|
"${configFilePrefix2}-version.cmake" @ONLY
|
|
)
|
|
endif()
|
|
|
|
# Now that we've created the redirected package config files, prevent
|
|
# find_package() from delegating to FetchContent and let it find these
|
|
# config files through its normal processing.
|
|
set(propertyName "${prefix}_override_find_package")
|
|
set(GLOBAL PROPERTY ${propertyName} FALSE)
|
|
set(${contentName}_DIR "${CMAKE_FIND_PACKAGE_REDIRECTS_DIR}"
|
|
CACHE INTERNAL "Redirected by FetchContent"
|
|
)
|
|
|
|
endfunction()
|
|
|
|
# Arguments are assumed to be the names of dependencies that have been
|
|
# declared previously and should be populated. It is not an error if
|
|
# any of them have already been populated (they will just be skipped in
|
|
# that case). The command is implemented as a macro so that the variables
|
|
# defined by the FetchContent_GetProperties() and FetchContent_Populate()
|
|
# calls will be available to the caller.
|
|
macro(FetchContent_MakeAvailable)
|
|
|
|
# We must append an item, even if the variable is unset, so prefix its value.
|
|
# We will strip that prefix when we pop the value at the end of the macro.
|
|
list(APPEND __cmake_fcCurrentVarsStack
|
|
"__fcprefix__${CMAKE_VERIFY_INTERFACE_HEADER_SETS}"
|
|
)
|
|
set(CMAKE_VERIFY_INTERFACE_HEADER_SETS FALSE)
|
|
|
|
get_property(__cmake_providerCommand GLOBAL PROPERTY
|
|
__FETCHCONTENT_MAKEAVAILABLE_SERIAL_PROVIDER
|
|
)
|
|
foreach(__cmake_contentName IN ITEMS ${ARGV})
|
|
string(TOLOWER ${__cmake_contentName} __cmake_contentNameLower)
|
|
|
|
# If user specified FETCHCONTENT_SOURCE_DIR_... for this dependency, that
|
|
# overrides everything else and we shouldn't try to use find_package() or
|
|
# a dependency provider.
|
|
string(TOUPPER ${__cmake_contentName} __cmake_contentNameUpper)
|
|
if("${FETCHCONTENT_SOURCE_DIR_${__cmake_contentNameUpper}}" STREQUAL "")
|
|
# Dependency provider gets first opportunity, but prevent infinite
|
|
# recursion if we are called again for the same thing
|
|
if(NOT "${__cmake_providerCommand}" STREQUAL "" AND
|
|
NOT DEFINED __cmake_fcProvider_${__cmake_contentNameLower})
|
|
message(VERBOSE
|
|
"Trying FETCHCONTENT_MAKEAVAILABLE_SERIAL dependency provider for "
|
|
"${__cmake_contentName}"
|
|
)
|
|
# It's still valid if there are no saved details. The project may have
|
|
# been written to assume a dependency provider is always set and will
|
|
# provide dependencies without having any declared details for them.
|
|
__FetchContent_getSavedDetails(${__cmake_contentName} __cmake_contentDetails)
|
|
set(__cmake_providerArgs
|
|
"FETCHCONTENT_MAKEAVAILABLE_SERIAL"
|
|
"${__cmake_contentName}"
|
|
)
|
|
# Empty arguments must be preserved because of things like
|
|
# GIT_SUBMODULES (see CMP0097)
|
|
foreach(__cmake_item IN LISTS __cmake_contentDetails)
|
|
string(APPEND __cmake_providerArgs " [==[${__cmake_item}]==]")
|
|
endforeach()
|
|
|
|
# This property might be defined but empty. As long as it is defined,
|
|
# find_package() can be called.
|
|
get_property(__cmake_addfpargs GLOBAL PROPERTY
|
|
_FetchContent_${contentNameLower}_find_package_args
|
|
DEFINED
|
|
)
|
|
if(__cmake_addfpargs)
|
|
get_property(__cmake_fpargs GLOBAL PROPERTY
|
|
_FetchContent_${contentNameLower}_find_package_args
|
|
)
|
|
string(APPEND __cmake_providerArgs " FIND_PACKAGE_ARGS")
|
|
foreach(__cmake_item IN LISTS __cmake_fpargs)
|
|
string(APPEND __cmake_providerArgs " [==[${__cmake_item}]==]")
|
|
endforeach()
|
|
endif()
|
|
|
|
# Calling the provider could lead to FetchContent_MakeAvailable() being
|
|
# called for a nested dependency. That nested call may occur in the
|
|
# current variable scope. We have to save and restore the variables we
|
|
# need preserved.
|
|
list(APPEND __cmake_fcCurrentVarsStack
|
|
${__cmake_contentName}
|
|
${__cmake_contentNameLower}
|
|
)
|
|
|
|
set(__cmake_fcProvider_${__cmake_contentNameLower} YES)
|
|
cmake_language(EVAL CODE "${__cmake_providerCommand}(${__cmake_providerArgs})")
|
|
|
|
list(POP_BACK __cmake_fcCurrentVarsStack
|
|
__cmake_contentNameLower
|
|
__cmake_contentName
|
|
)
|
|
|
|
unset(__cmake_fcProvider_${__cmake_contentNameLower})
|
|
unset(__cmake_providerArgs)
|
|
unset(__cmake_addfpargs)
|
|
unset(__cmake_fpargs)
|
|
unset(__cmake_item)
|
|
unset(__cmake_contentDetails)
|
|
|
|
FetchContent_GetProperties(${__cmake_contentName})
|
|
if(${__cmake_contentNameLower}_POPULATED)
|
|
continue()
|
|
endif()
|
|
endif()
|
|
|
|
# Check if we've been asked to try find_package() first, even if we
|
|
# have already populated this dependency. If we previously tried to
|
|
# use find_package() for this and it succeeded, those things might
|
|
# no longer be in scope, so we have to do it again.
|
|
get_property(__cmake_haveFpArgs GLOBAL PROPERTY
|
|
_FetchContent_${__cmake_contentNameLower}_find_package_args DEFINED
|
|
)
|
|
if(__cmake_haveFpArgs)
|
|
unset(__cmake_haveFpArgs)
|
|
message(VERBOSE "Trying find_package(${__cmake_contentName} ...) before FetchContent")
|
|
get_property(__cmake_fpArgs GLOBAL PROPERTY
|
|
_FetchContent_${__cmake_contentNameLower}_find_package_args
|
|
)
|
|
|
|
# This call could lead to FetchContent_MakeAvailable() being called for
|
|
# a nested dependency and it may occur in the current variable scope.
|
|
# We have to save/restore the variables we need to preserve.
|
|
list(APPEND __cmake_fcCurrentNameStack
|
|
${__cmake_contentName}
|
|
${__cmake_contentNameLower}
|
|
)
|
|
find_package(${__cmake_contentName} ${__cmake_fpArgs})
|
|
list(POP_BACK __cmake_fcCurrentNameStack
|
|
__cmake_contentNameLower
|
|
__cmake_contentName
|
|
)
|
|
unset(__cmake_fpArgs)
|
|
|
|
if(${__cmake_contentName}_FOUND)
|
|
FetchContent_SetPopulated(${__cmake_contentName})
|
|
FetchContent_GetProperties(${__cmake_contentName})
|
|
continue()
|
|
endif()
|
|
endif()
|
|
else()
|
|
unset(__cmake_haveFpArgs)
|
|
endif()
|
|
|
|
FetchContent_GetProperties(${__cmake_contentName})
|
|
if(NOT ${__cmake_contentNameLower}_POPULATED)
|
|
FetchContent_Populate(${__cmake_contentName})
|
|
__FetchContent_setupFindPackageRedirection(${__cmake_contentName})
|
|
|
|
# Only try to call add_subdirectory() if the populated content
|
|
# can be treated that way. Protecting the call with the check
|
|
# allows this function to be used for projects that just want
|
|
# to ensure the content exists, such as to provide content at
|
|
# a known location. We check the saved details for an optional
|
|
# SOURCE_SUBDIR which can be used in the same way as its meaning
|
|
# for ExternalProject. It won't matter if it was passed through
|
|
# to the ExternalProject sub-build, since it would have been
|
|
# ignored there.
|
|
set(__cmake_srcdir "${${__cmake_contentNameLower}_SOURCE_DIR}")
|
|
__FetchContent_getSavedDetails(${__cmake_contentName} __cmake_contentDetails)
|
|
if("${__cmake_contentDetails}" STREQUAL "")
|
|
message(FATAL_ERROR "No details have been set for content: ${__cmake_contentName}")
|
|
endif()
|
|
cmake_parse_arguments(__cmake_arg "SYSTEM" "SOURCE_SUBDIR" "" ${__cmake_contentDetails})
|
|
if(NOT "${__cmake_arg_SOURCE_SUBDIR}" STREQUAL "")
|
|
string(APPEND __cmake_srcdir "/${__cmake_arg_SOURCE_SUBDIR}")
|
|
endif()
|
|
|
|
if(EXISTS ${__cmake_srcdir}/CMakeLists.txt)
|
|
if (__cmake_arg_SYSTEM)
|
|
add_subdirectory(${__cmake_srcdir} ${${__cmake_contentNameLower}_BINARY_DIR} SYSTEM)
|
|
else()
|
|
add_subdirectory(${__cmake_srcdir} ${${__cmake_contentNameLower}_BINARY_DIR})
|
|
endif()
|
|
endif()
|
|
|
|
unset(__cmake_srcdir)
|
|
unset(__cmake_contentDetails)
|
|
unset(__cmake_arg_SOURCE_SUBDIR)
|
|
endif()
|
|
endforeach()
|
|
|
|
# Prefix will be "__fcprefix__"
|
|
list(POP_BACK __cmake_fcCurrentVarsStack __cmake_original_verify_setting)
|
|
string(SUBSTRING "${__cmake_original_verify_setting}"
|
|
12 -1 __cmake_original_verify_setting
|
|
)
|
|
set(CMAKE_VERIFY_INTERFACE_HEADER_SETS ${__cmake_original_verify_setting})
|
|
|
|
# clear local variables to prevent leaking into the caller's scope
|
|
unset(__cmake_contentName)
|
|
unset(__cmake_contentNameLower)
|
|
unset(__cmake_contentNameUpper)
|
|
unset(__cmake_providerCommand)
|
|
unset(__cmake_original_verify_setting)
|
|
|
|
endmacro()
|