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520 lines
19 KiB
520 lines
19 KiB
.. cmake-manual-description: CMake Toolchains Reference
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cmake-toolchains(7)
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*******************
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.. only:: html
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.. contents::
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Introduction
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============
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CMake uses a toolchain of utilities to compile, link libraries and create
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archives, and other tasks to drive the build. The toolchain utilities available
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are determined by the languages enabled. In normal builds, CMake automatically
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determines the toolchain for host builds based on system introspection and
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defaults. In cross-compiling scenarios, a toolchain file may be specified
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with information about compiler and utility paths.
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Languages
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=========
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Languages are enabled by the :command:`project` command. Language-specific
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built-in variables, such as
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:variable:`CMAKE_CXX_COMPILER <CMAKE_<LANG>_COMPILER>`,
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:variable:`CMAKE_CXX_COMPILER_ID <CMAKE_<LANG>_COMPILER_ID>` etc are set by
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invoking the :command:`project` command. If no project command
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is in the top-level CMakeLists file, one will be implicitly generated. By default
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the enabled languages are C and CXX:
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.. code-block:: cmake
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project(C_Only C)
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A special value of NONE can also be used with the :command:`project` command
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to enable no languages:
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.. code-block:: cmake
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project(MyProject NONE)
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The :command:`enable_language` command can be used to enable languages after the
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:command:`project` command:
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.. code-block:: cmake
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enable_language(CXX)
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When a language is enabled, CMake finds a compiler for that language, and
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determines some information, such as the vendor and version of the compiler,
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the target architecture and bitwidth, the location of corresponding utilities
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etc.
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The :prop_gbl:`ENABLED_LANGUAGES` global property contains the languages which
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are currently enabled.
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Variables and Properties
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========================
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Several variables relate to the language components of a toolchain which are
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enabled. :variable:`CMAKE_<LANG>_COMPILER` is the full path to the compiler used
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for ``<LANG>``. :variable:`CMAKE_<LANG>_COMPILER_ID` is the identifier used
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by CMake for the compiler and :variable:`CMAKE_<LANG>_COMPILER_VERSION` is the
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version of the compiler.
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The :variable:`CMAKE_<LANG>_FLAGS` variables and the configuration-specific
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equivalents contain flags that will be added to the compile command when
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compiling a file of a particular language.
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As the linker is invoked by the compiler driver, CMake needs a way to determine
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which compiler to use to invoke the linker. This is calculated by the
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:prop_sf:`LANGUAGE` of source files in the target, and in the case of static
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libraries, the language of the dependent libraries. The choice CMake makes may
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be overridden with the :prop_tgt:`LINKER_LANGUAGE` target property.
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Toolchain Features
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==================
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CMake provides the :command:`try_compile` command and wrapper macros such as
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:module:`CheckCXXSourceCompiles`, :module:`CheckCXXSymbolExists` and
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:module:`CheckIncludeFile` to test capability and availability of various
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toolchain features. These APIs test the toolchain in some way and cache the
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result so that the test does not have to be performed again the next time
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CMake runs.
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Some toolchain features have built-in handling in CMake, and do not require
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compile-tests. For example, :prop_tgt:`POSITION_INDEPENDENT_CODE` allows
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specifying that a target should be built as position-independent code, if
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the compiler supports that feature. The :prop_tgt:`<LANG>_VISIBILITY_PRESET`
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and :prop_tgt:`VISIBILITY_INLINES_HIDDEN` target properties add flags for
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hidden visibility, if supported by the compiler.
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.. _`Cross Compiling Toolchain`:
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Cross Compiling
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===============
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If :manual:`cmake(1)` is invoked with the command line parameter
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``-DCMAKE_TOOLCHAIN_FILE=path/to/file``, the file will be loaded early to set
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values for the compilers.
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The :variable:`CMAKE_CROSSCOMPILING` variable is set to true when CMake is
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cross-compiling.
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Cross Compiling for Linux
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-------------------------
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A typical cross-compiling toolchain for Linux has content such
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as:
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.. code-block:: cmake
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set(CMAKE_SYSTEM_NAME Linux)
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set(CMAKE_SYSTEM_PROCESSOR arm)
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set(CMAKE_SYSROOT /home/devel/rasp-pi-rootfs)
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set(CMAKE_STAGING_PREFIX /home/devel/stage)
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set(tools /home/devel/gcc-4.7-linaro-rpi-gnueabihf)
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set(CMAKE_C_COMPILER ${tools}/bin/arm-linux-gnueabihf-gcc)
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set(CMAKE_CXX_COMPILER ${tools}/bin/arm-linux-gnueabihf-g++)
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set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
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set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
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set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
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set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
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The :variable:`CMAKE_SYSTEM_NAME` is the CMake-identifier of the target platform
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to build for.
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The :variable:`CMAKE_SYSTEM_PROCESSOR` is the CMake-identifier of the target architecture
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to build for.
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The :variable:`CMAKE_SYSROOT` is optional, and may be specified if a sysroot
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is available.
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The :variable:`CMAKE_STAGING_PREFIX` is also optional. It may be used to specify
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a path on the host to install to. The :variable:`CMAKE_INSTALL_PREFIX` is always
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the runtime installation location, even when cross-compiling.
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The :variable:`CMAKE_<LANG>_COMPILER` variables may be set to full paths, or to
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names of compilers to search for in standard locations. For toolchains that
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do not support linking binaries without custom flags or scripts one may set
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the :variable:`CMAKE_TRY_COMPILE_TARGET_TYPE` variable to ``STATIC_LIBRARY``
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to tell CMake not to try to link executables during its checks.
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CMake ``find_*`` commands will look in the sysroot, and the :variable:`CMAKE_FIND_ROOT_PATH`
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entries by default in all cases, as well as looking in the host system root prefix.
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Although this can be controlled on a case-by-case basis, when cross-compiling, it
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can be useful to exclude looking in either the host or the target for particular
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artifacts. Generally, includes, libraries and packages should be found in the
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target system prefixes, whereas executables which must be run as part of the build
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should be found only on the host and not on the target. This is the purpose of
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the ``CMAKE_FIND_ROOT_PATH_MODE_*`` variables.
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.. _`Cray Cross-Compile`:
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Cross Compiling for the Cray Linux Environment
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----------------------------------------------
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Cross compiling for compute nodes in the Cray Linux Environment can be done
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without needing a separate toolchain file. Specifying
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``-DCMAKE_SYSTEM_NAME=CrayLinuxEnvironment`` on the CMake command line will
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ensure that the appropriate build settings and search paths are configured.
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The platform will pull its configuration from the current environment
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variables and will configure a project to use the compiler wrappers from the
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Cray Programming Environment's ``PrgEnv-*`` modules if present and loaded.
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The default configuration of the Cray Programming Environment is to only
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support static libraries. This can be overridden and shared libraries
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enabled by setting the ``CRAYPE_LINK_TYPE`` environment variable to
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``dynamic``.
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Running CMake without specifying :variable:`CMAKE_SYSTEM_NAME` will
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run the configure step in host mode assuming a standard Linux environment.
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If not overridden, the ``PrgEnv-*`` compiler wrappers will end up getting used,
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which if targeting the either the login node or compute node, is likely not the
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desired behavior. The exception to this would be if you are building directly
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on a NID instead of cross-compiling from a login node. If trying to build
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software for a login node, you will need to either first unload the
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currently loaded ``PrgEnv-*`` module or explicitly tell CMake to use the
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system compilers in ``/usr/bin`` instead of the Cray wrappers. If instead
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targeting a compute node is desired, just specify the
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:variable:`CMAKE_SYSTEM_NAME` as mentioned above.
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Cross Compiling using Clang
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---------------------------
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Some compilers such as Clang are inherently cross compilers.
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The :variable:`CMAKE_<LANG>_COMPILER_TARGET` can be set to pass a
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value to those supported compilers when compiling:
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.. code-block:: cmake
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set(CMAKE_SYSTEM_NAME Linux)
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set(CMAKE_SYSTEM_PROCESSOR arm)
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set(triple arm-linux-gnueabihf)
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set(CMAKE_C_COMPILER clang)
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set(CMAKE_C_COMPILER_TARGET ${triple})
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set(CMAKE_CXX_COMPILER clang++)
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set(CMAKE_CXX_COMPILER_TARGET ${triple})
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Similarly, some compilers do not ship their own supplementary utilities
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such as linkers, but provide a way to specify the location of the external
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toolchain which will be used by the compiler driver. The
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:variable:`CMAKE_<LANG>_COMPILER_EXTERNAL_TOOLCHAIN` variable can be set in a
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toolchain file to pass the path to the compiler driver.
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Cross Compiling for QNX
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-----------------------
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As the Clang compiler the QNX QCC compile is inherently a cross compiler.
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And the :variable:`CMAKE_<LANG>_COMPILER_TARGET` can be set to pass a
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value to those supported compilers when compiling:
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.. code-block:: cmake
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set(CMAKE_SYSTEM_NAME QNX)
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set(arch gcc_ntoarmv7le)
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set(CMAKE_C_COMPILER qcc)
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set(CMAKE_C_COMPILER_TARGET ${arch})
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set(CMAKE_CXX_COMPILER QCC)
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set(CMAKE_CXX_COMPILER_TARGET ${arch})
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Cross Compiling for Windows CE
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------------------------------
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Cross compiling for Windows CE requires the corresponding SDK being
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installed on your system. These SDKs are usually installed under
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``C:/Program Files (x86)/Windows CE Tools/SDKs``.
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A toolchain file to configure a Visual Studio generator for
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Windows CE may look like this:
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.. code-block:: cmake
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set(CMAKE_SYSTEM_NAME WindowsCE)
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set(CMAKE_SYSTEM_VERSION 8.0)
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set(CMAKE_SYSTEM_PROCESSOR arm)
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set(CMAKE_GENERATOR_TOOLSET CE800) # Can be omitted for 8.0
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set(CMAKE_GENERATOR_PLATFORM SDK_AM335X_SK_WEC2013_V310)
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The :variable:`CMAKE_GENERATOR_PLATFORM` tells the generator which SDK to use.
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Further :variable:`CMAKE_SYSTEM_VERSION` tells the generator what version of
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Windows CE to use. Currently version 8.0 (Windows Embedded Compact 2013) is
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supported out of the box. Other versions may require one to set
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:variable:`CMAKE_GENERATOR_TOOLSET` to the correct value.
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Cross Compiling for Windows 10 Universal Applications
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-----------------------------------------------------
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A toolchain file to configure a Visual Studio generator for a
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Windows 10 Universal Application may look like this:
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.. code-block:: cmake
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set(CMAKE_SYSTEM_NAME WindowsStore)
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set(CMAKE_SYSTEM_VERSION 10.0)
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A Windows 10 Universal Application targets both Windows Store and
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Windows Phone. Specify the :variable:`CMAKE_SYSTEM_VERSION` variable
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to be ``10.0`` to build with the latest available Windows 10 SDK.
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Specify a more specific version (e.g. ``10.0.10240.0`` for RTM)
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to build with the corresponding SDK.
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Cross Compiling for Windows Phone
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---------------------------------
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A toolchain file to configure a Visual Studio generator for
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Windows Phone may look like this:
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.. code-block:: cmake
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set(CMAKE_SYSTEM_NAME WindowsPhone)
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set(CMAKE_SYSTEM_VERSION 8.1)
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Cross Compiling for Windows Store
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---------------------------------
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A toolchain file to configure a Visual Studio generator for
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Windows Store may look like this:
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.. code-block:: cmake
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set(CMAKE_SYSTEM_NAME WindowsStore)
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set(CMAKE_SYSTEM_VERSION 8.1)
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.. _`Cross Compiling for Android`:
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Cross Compiling for Android
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---------------------------
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A toolchain file may configure cross-compiling for Android by setting the
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:variable:`CMAKE_SYSTEM_NAME` variable to ``Android``. Further configuration
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is specific to the Android development environment to be used.
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For :ref:`Visual Studio Generators`, CMake expects :ref:`NVIDIA Nsight Tegra
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Visual Studio Edition <Cross Compiling for Android with NVIDIA Nsight Tegra
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Visual Studio Edition>` to be installed. See that section for further
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configuration details.
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For :ref:`Makefile Generators` and the :generator:`Ninja` generator,
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CMake expects one of these environments:
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* :ref:`NDK <Cross Compiling for Android with the NDK>`
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* :ref:`Standalone Toolchain <Cross Compiling for Android with a Standalone Toolchain>`
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CMake uses the following steps to select one of the environments:
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* If the :variable:`CMAKE_ANDROID_NDK` variable is set, the NDK at the
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specified location will be used.
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* Else, if the :variable:`CMAKE_ANDROID_STANDALONE_TOOLCHAIN` variable
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is set, the Standalone Toolchain at the specified location will be used.
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* Else, if the :variable:`CMAKE_SYSROOT` variable is set to a directory
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of the form ``<ndk>/platforms/android-<api>/arch-<arch>``, the ``<ndk>``
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part will be used as the value of :variable:`CMAKE_ANDROID_NDK` and the
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NDK will be used.
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* Else, if the :variable:`CMAKE_SYSROOT` variable is set to a directory of the
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form ``<standalone-toolchain>/sysroot``, the ``<standalone-toolchain>`` part
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will be used as the value of :variable:`CMAKE_ANDROID_STANDALONE_TOOLCHAIN`
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and the Standalone Toolchain will be used.
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* Else, if a cmake variable ``ANDROID_NDK`` is set it will be used
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as the value of :variable:`CMAKE_ANDROID_NDK`, and the NDK will be used.
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* Else, if a cmake variable ``ANDROID_STANDALONE_TOOLCHAIN`` is set, it will be
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used as the value of :variable:`CMAKE_ANDROID_STANDALONE_TOOLCHAIN`, and the
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Standalone Toolchain will be used.
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* Else, if an environment variable ``ANDROID_NDK_ROOT`` or
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``ANDROID_NDK`` is set, it will be used as the value of
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:variable:`CMAKE_ANDROID_NDK`, and the NDK will be used.
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* Else, if an environment variable ``ANDROID_STANDALONE_TOOLCHAIN`` is
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set then it will be used as the value of
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:variable:`CMAKE_ANDROID_STANDALONE_TOOLCHAIN`, and the Standalone
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Toolchain will be used.
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* Else, an error diagnostic will be issued that neither the NDK or
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Standalone Toolchain can be found.
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.. _`Cross Compiling for Android with the NDK`:
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Cross Compiling for Android with the NDK
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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A toolchain file may configure :ref:`Makefile Generators` or the
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:generator:`Ninja` generator to target Android for cross-compiling.
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Configure use of an Android NDK with the following variables:
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:variable:`CMAKE_SYSTEM_NAME`
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Set to ``Android``. Must be specified to enable cross compiling
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for Android.
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:variable:`CMAKE_SYSTEM_VERSION`
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Set to the Android API level. If not specified, the value is
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determined as follows:
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* If the :variable:`CMAKE_ANDROID_API` variable is set, its value
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is used as the API level.
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* If the :variable:`CMAKE_SYSROOT` variable is set, the API level is
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detected from the NDK directory structure containing the sysroot.
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* Otherwise, the latest API level available in the NDK is used.
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:variable:`CMAKE_ANDROID_ARCH_ABI`
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Set to the Android ABI (architecture). If not specified, this
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variable will default to ``armeabi``.
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The :variable:`CMAKE_ANDROID_ARCH` variable will be computed
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from ``CMAKE_ANDROID_ARCH_ABI`` automatically.
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Also see the :variable:`CMAKE_ANDROID_ARM_MODE` and
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:variable:`CMAKE_ANDROID_ARM_NEON` variables.
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:variable:`CMAKE_ANDROID_NDK`
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Set to the absolute path to the Android NDK root directory.
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A ``${CMAKE_ANDROID_NDK}/platforms`` directory must exist.
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If not specified, a default for this variable will be chosen
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as specified :ref:`above <Cross Compiling for Android>`.
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:variable:`CMAKE_ANDROID_NDK_TOOLCHAIN_VERSION`
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Set to the version of the NDK toolchain to be selected as the compiler.
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If not specified, the latest available GCC toolchain will be used.
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:variable:`CMAKE_ANDROID_STL_TYPE`
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Set to specify which C++ standard library to use. If not specified,
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a default will be selected as described in the variable documentation.
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The following variables will be computed and provided automatically:
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:variable:`CMAKE_<LANG>_ANDROID_TOOLCHAIN_PREFIX`
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The absolute path prefix to the binutils in the NDK toolchain.
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:variable:`CMAKE_<LANG>_ANDROID_TOOLCHAIN_SUFFIX`
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The host platform suffix of the binutils in the NDK toolchain.
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For example, a toolchain file might contain:
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.. code-block:: cmake
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set(CMAKE_SYSTEM_NAME Android)
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set(CMAKE_SYSTEM_VERSION 21) # API level
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set(CMAKE_ANDROID_ARCH_ABI arm64-v8a)
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set(CMAKE_ANDROID_NDK /path/to/android-ndk)
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set(CMAKE_ANDROID_STL_TYPE gnustl_static)
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Alternatively one may specify the values without a toolchain file:
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.. code-block:: console
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$ cmake ../src \
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-DCMAKE_SYSTEM_NAME=Android \
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-DCMAKE_SYSTEM_VERSION=21 \
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-DCMAKE_ANDROID_ARCH_ABI=arm64-v8a \
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-DCMAKE_ANDROID_NDK=/path/to/android-ndk \
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-DCMAKE_ANDROID_STL_TYPE=gnustl_static
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.. _`Cross Compiling for Android with a Standalone Toolchain`:
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Cross Compiling for Android with a Standalone Toolchain
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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A toolchain file may configure :ref:`Makefile Generators` or the
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:generator:`Ninja` generator to target Android for cross-compiling
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using a standalone toolchain.
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Configure use of an Android standalone toolchain with the following variables:
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:variable:`CMAKE_SYSTEM_NAME`
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Set to ``Android``. Must be specified to enable cross compiling
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for Android.
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:variable:`CMAKE_ANDROID_STANDALONE_TOOLCHAIN`
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Set to the absolute path to the standalone toolchain root directory.
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A ``${CMAKE_ANDROID_STANDALONE_TOOLCHAIN}/sysroot`` directory
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must exist.
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If not specified, a default for this variable will be chosen
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as specified :ref:`above <Cross Compiling for Android>`.
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:variable:`CMAKE_ANDROID_ARM_MODE`
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When the standalone toolchain targets ARM, optionally set this to ``ON``
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to target 32-bit ARM instead of 16-bit Thumb.
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See variable documentation for details.
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:variable:`CMAKE_ANDROID_ARM_NEON`
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When the standalone toolchain targets ARM v7, optionally set thisto ``ON``
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to target ARM NEON devices. See variable documentation for details.
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The following variables will be computed and provided automatically:
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:variable:`CMAKE_SYSTEM_VERSION`
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The Android API level detected from the standalone toolchain.
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:variable:`CMAKE_ANDROID_ARCH_ABI`
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The Android ABI detected from the standalone toolchain.
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:variable:`CMAKE_<LANG>_ANDROID_TOOLCHAIN_PREFIX`
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The absolute path prefix to the binutils in the standalone toolchain.
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:variable:`CMAKE_<LANG>_ANDROID_TOOLCHAIN_SUFFIX`
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The host platform suffix of the binutils in the standalone toolchain.
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For example, a toolchain file might contain:
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.. code-block:: cmake
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set(CMAKE_SYSTEM_NAME Android)
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set(CMAKE_ANDROID_STANDALONE_TOOLCHAIN /path/to/android-toolchain)
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Alternatively one may specify the values without a toolchain file:
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.. code-block:: console
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$ cmake ../src \
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-DCMAKE_SYSTEM_NAME=Android \
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-DCMAKE_ANDROID_STANDALONE_TOOLCHAIN=/path/to/android-toolchain
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.. _`Cross Compiling for Android with NVIDIA Nsight Tegra Visual Studio Edition`:
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Cross Compiling for Android with NVIDIA Nsight Tegra Visual Studio Edition
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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A toolchain file to configure one of the :ref:`Visual Studio Generators`
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to build using NVIDIA Nsight Tegra targeting Android may look like this:
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|
.. code-block:: cmake
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set(CMAKE_SYSTEM_NAME Android)
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The :variable:`CMAKE_GENERATOR_TOOLSET` may be set to select
|
|
the Nsight Tegra "Toolchain Version" value.
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See also target properties:
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* :prop_tgt:`ANDROID_ANT_ADDITIONAL_OPTIONS`
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|
* :prop_tgt:`ANDROID_API_MIN`
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|
* :prop_tgt:`ANDROID_API`
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|
* :prop_tgt:`ANDROID_ARCH`
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|
* :prop_tgt:`ANDROID_ASSETS_DIRECTORIES`
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* :prop_tgt:`ANDROID_GUI`
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|
* :prop_tgt:`ANDROID_JAR_DEPENDENCIES`
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* :prop_tgt:`ANDROID_JAR_DIRECTORIES`
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|
* :prop_tgt:`ANDROID_JAVA_SOURCE_DIR`
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|
* :prop_tgt:`ANDROID_NATIVE_LIB_DEPENDENCIES`
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* :prop_tgt:`ANDROID_NATIVE_LIB_DIRECTORIES`
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* :prop_tgt:`ANDROID_PROCESS_MAX`
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* :prop_tgt:`ANDROID_PROGUARD_CONFIG_PATH`
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* :prop_tgt:`ANDROID_PROGUARD`
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|
* :prop_tgt:`ANDROID_SECURE_PROPS_PATH`
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|
* :prop_tgt:`ANDROID_SKIP_ANT_STEP`
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* :prop_tgt:`ANDROID_STL_TYPE`
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