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185 lines
6.7 KiB
185 lines
6.7 KiB
A short-hand signature is:
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.. parsed-literal::
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|FIND_XXX| (<VAR> name1 [path1 path2 ...])
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The general signature is:
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.. parsed-literal::
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|FIND_XXX| (
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<VAR>
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name | |NAMES|
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[HINTS [path | ENV var]... ]
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[PATHS [path | ENV var]... ]
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[PATH_SUFFIXES suffix1 [suffix2 ...]]
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[DOC "cache documentation string"]
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[NO_CACHE]
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[REQUIRED]
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[NO_DEFAULT_PATH]
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[NO_PACKAGE_ROOT_PATH]
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[NO_CMAKE_PATH]
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[NO_CMAKE_ENVIRONMENT_PATH]
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[NO_SYSTEM_ENVIRONMENT_PATH]
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[NO_CMAKE_SYSTEM_PATH]
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[CMAKE_FIND_ROOT_PATH_BOTH |
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ONLY_CMAKE_FIND_ROOT_PATH |
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NO_CMAKE_FIND_ROOT_PATH]
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)
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This command is used to find a |SEARCH_XXX_DESC|.
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A cache entry, or a normal variable if ``NO_CACHE`` is specified,
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named by ``<VAR>`` is created to store the result of this command.
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If the |SEARCH_XXX| is found the result is stored in the variable
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and the search will not be repeated unless the variable is cleared.
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If nothing is found, the result will be ``<VAR>-NOTFOUND``.
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Options include:
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``NAMES``
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Specify one or more possible names for the |SEARCH_XXX|.
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When using this to specify names with and without a version
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suffix, we recommend specifying the unversioned name first
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so that locally-built packages can be found before those
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provided by distributions.
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``HINTS``, ``PATHS``
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Specify directories to search in addition to the default locations.
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The ``ENV var`` sub-option reads paths from a system environment
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variable.
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``PATH_SUFFIXES``
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Specify additional subdirectories to check below each directory
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location otherwise considered.
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``DOC``
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Specify the documentation string for the ``<VAR>`` cache entry.
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``NO_CACHE``
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.. versionadded:: 3.21
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The result of the search will be stored in a normal variable rather than
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a cache entry.
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.. note::
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If the variable is already set before the call (as a normal or cache
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variable) then the search will not occur.
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.. warning::
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This option should be used with caution because it can greatly increase
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the cost of repeated configure steps.
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``REQUIRED``
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.. versionadded:: 3.18
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Stop processing with an error message if nothing is found, otherwise
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the search will be attempted again the next time |FIND_XXX| is invoked
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with the same variable.
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If ``NO_DEFAULT_PATH`` is specified, then no additional paths are
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added to the search.
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If ``NO_DEFAULT_PATH`` is not specified, the search process is as follows:
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.. |FIND_PACKAGE_ROOT_PREFIX_PATH_XXX_SUBDIR| replace::
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|prefix_XXX_SUBDIR| for each ``<prefix>`` in the
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:variable:`<PackageName>_ROOT` CMake variable and the
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:envvar:`<PackageName>_ROOT` environment variable if
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called from within a find module loaded by
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:command:`find_package(<PackageName>)`
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.. |CMAKE_PREFIX_PATH_XXX_SUBDIR| replace::
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|prefix_XXX_SUBDIR| for each ``<prefix>`` in :variable:`CMAKE_PREFIX_PATH`
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.. |SYSTEM_ENVIRONMENT_PREFIX_PATH_XXX_SUBDIR| replace::
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|prefix_XXX_SUBDIR| for each ``<prefix>/[s]bin`` in ``PATH``, and
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|entry_XXX_SUBDIR| for other entries in ``PATH``
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.. |CMAKE_SYSTEM_PREFIX_PATH_XXX_SUBDIR| replace::
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|prefix_XXX_SUBDIR| for each ``<prefix>`` in
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:variable:`CMAKE_SYSTEM_PREFIX_PATH`
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1. .. versionadded:: 3.12
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If called from within a find module or any other script loaded by a call to
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:command:`find_package(<PackageName>)`, search prefixes unique to the
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current package being found. Specifically, look in the
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:variable:`<PackageName>_ROOT` CMake variable and the
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:envvar:`<PackageName>_ROOT` environment variable.
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The package root variables are maintained as a stack, so if called from
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nested find modules or config packages, root paths from the parent's find
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module or config package will be searched after paths from the current
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module or package. In other words, the search order would be
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``<CurrentPackage>_ROOT``, ``ENV{<CurrentPackage>_ROOT}``,
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``<ParentPackage>_ROOT``, ``ENV{<ParentPackage>_ROOT}``, etc.
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This can be skipped if ``NO_PACKAGE_ROOT_PATH`` is passed or by setting
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the :variable:`CMAKE_FIND_USE_PACKAGE_ROOT_PATH` to ``FALSE``.
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See policy :policy:`CMP0074`.
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* |FIND_PACKAGE_ROOT_PREFIX_PATH_XXX|
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2. Search paths specified in cmake-specific cache variables.
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These are intended to be used on the command line with a ``-DVAR=value``.
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The values are interpreted as :ref:`semicolon-separated lists <CMake Language Lists>`.
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This can be skipped if ``NO_CMAKE_PATH`` is passed or by setting the
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:variable:`CMAKE_FIND_USE_CMAKE_PATH` to ``FALSE``.
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* |CMAKE_PREFIX_PATH_XXX|
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* |CMAKE_XXX_PATH|
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* |CMAKE_XXX_MAC_PATH|
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3. Search paths specified in cmake-specific environment variables.
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These are intended to be set in the user's shell configuration,
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and therefore use the host's native path separator
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(``;`` on Windows and ``:`` on UNIX).
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This can be skipped if ``NO_CMAKE_ENVIRONMENT_PATH`` is passed or
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by setting the :variable:`CMAKE_FIND_USE_CMAKE_ENVIRONMENT_PATH` to ``FALSE``.
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* |CMAKE_PREFIX_PATH_XXX|
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* |CMAKE_XXX_PATH|
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* |CMAKE_XXX_MAC_PATH|
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4. Search the paths specified by the ``HINTS`` option.
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These should be paths computed by system introspection, such as a
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hint provided by the location of another item already found.
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Hard-coded guesses should be specified with the ``PATHS`` option.
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5. Search the standard system environment variables.
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This can be skipped if ``NO_SYSTEM_ENVIRONMENT_PATH`` is passed or by
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setting the :variable:`CMAKE_FIND_USE_SYSTEM_ENVIRONMENT_PATH` to ``FALSE``.
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* |SYSTEM_ENVIRONMENT_PATH_XXX|
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* |SYSTEM_ENVIRONMENT_PATH_WINDOWS_XXX|
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6. Search cmake variables defined in the Platform files
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for the current system. This can be skipped if ``NO_CMAKE_SYSTEM_PATH``
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is passed or by setting the :variable:`CMAKE_FIND_USE_CMAKE_SYSTEM_PATH`
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to ``FALSE``.
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* |CMAKE_SYSTEM_PREFIX_PATH_XXX|
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* |CMAKE_SYSTEM_XXX_PATH|
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* |CMAKE_SYSTEM_XXX_MAC_PATH|
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The platform paths that these variables contain are locations that
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typically include installed software. An example being ``/usr/local`` for
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UNIX based platforms.
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7. Search the paths specified by the PATHS option
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or in the short-hand version of the command.
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These are typically hard-coded guesses.
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.. versionadded:: 3.16
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Added ``CMAKE_FIND_USE_<CATEGORY>_PATH`` variables to globally disable
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various search locations.
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.. |FIND_ARGS_XXX| replace:: <VAR> NAMES name
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On macOS the :variable:`CMAKE_FIND_FRAMEWORK` and
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:variable:`CMAKE_FIND_APPBUNDLE` variables determine the order of
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preference between Apple-style and unix-style package components.
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.. include:: FIND_XXX_ROOT.txt
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.. include:: FIND_XXX_ORDER.txt
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