Help: Document cross compiling for Android
CMake now supports cross compiling for Android using the NDK or a standalone toolchain. Document the associated variables and how how to write toolchain files for Android.
This commit is contained in:
Brad King
parent
d7d4083025
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@ -290,12 +290,206 @@ Windows Store may look like this:
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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 using NVIDIA Nsight Tegra
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-----------------------------------------
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.. _`Cross Compiling for Android`:
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A toolchain file to configure a Visual Studio generator to
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build using NVIDIA Nsight Tegra targeting Android may look
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like this:
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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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@ -225,6 +225,9 @@ Variables that Control the Build
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/variable/CMAKE_ANDROID_API
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/variable/CMAKE_ANDROID_API_MIN
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/variable/CMAKE_ANDROID_ARCH
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/variable/CMAKE_ANDROID_ARCH_ABI
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/variable/CMAKE_ANDROID_ARM_MODE
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/variable/CMAKE_ANDROID_ARM_NEON
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/variable/CMAKE_ANDROID_ASSETS_DIRECTORIES
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/variable/CMAKE_ANDROID_GUI
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/variable/CMAKE_ANDROID_JAR_DEPENDENCIES
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@ -232,11 +235,14 @@ Variables that Control the Build
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/variable/CMAKE_ANDROID_JAVA_SOURCE_DIR
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/variable/CMAKE_ANDROID_NATIVE_LIB_DEPENDENCIES
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/variable/CMAKE_ANDROID_NATIVE_LIB_DIRECTORIES
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/variable/CMAKE_ANDROID_NDK
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/variable/CMAKE_ANDROID_NDK_TOOLCHAIN_VERSION
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/variable/CMAKE_ANDROID_PROCESS_MAX
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/variable/CMAKE_ANDROID_PROGUARD
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/variable/CMAKE_ANDROID_PROGUARD_CONFIG_PATH
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/variable/CMAKE_ANDROID_SECURE_PROPS_PATH
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/variable/CMAKE_ANDROID_SKIP_ANT_STEP
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/variable/CMAKE_ANDROID_STANDALONE_TOOLCHAIN
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/variable/CMAKE_ANDROID_STL_TYPE
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/variable/CMAKE_ARCHIVE_OUTPUT_DIRECTORY
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/variable/CMAKE_ARCHIVE_OUTPUT_DIRECTORY_CONFIG
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@ -337,6 +343,8 @@ Variables for Languages
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/variable/CMAKE_Fortran_MODDIR_FLAG
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/variable/CMAKE_Fortran_MODOUT_FLAG
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/variable/CMAKE_INTERNAL_PLATFORM_ABI
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/variable/CMAKE_LANG_ANDROID_TOOLCHAIN_PREFIX
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/variable/CMAKE_LANG_ANDROID_TOOLCHAIN_SUFFIX
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/variable/CMAKE_LANG_ARCHIVE_APPEND
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/variable/CMAKE_LANG_ARCHIVE_CREATE
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/variable/CMAKE_LANG_ARCHIVE_FINISH
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@ -1,7 +1,8 @@
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ANDROID_API
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-----------
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Set the Android Target API version (e.g. ``15``). The version number
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must be a positive decimal integer. This property is initialized by
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the value of the :variable:`CMAKE_ANDROID_API` variable if it is set
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when a target is created.
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When :ref:`Cross Compiling for Android with NVIDIA Nsight Tegra Visual Studio
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Edition`, this property sets the Android target API version (e.g. ``15``).
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The version number must be a positive decimal integer. This property is
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initialized by the value of the :variable:`CMAKE_ANDROID_API` variable if
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it is set when a target is created.
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@ -1,7 +1,8 @@
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ANDROID_ARCH
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------------
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Set the Android target architecture.
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When :ref:`Cross Compiling for Android with NVIDIA Nsight Tegra Visual Studio
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Edition`, this property sets the Android target architecture.
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This is a string property that could be set to the one of
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the following values:
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@ -1,7 +1,9 @@
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ANDROID_GUI
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-----------
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Build an executable as an application package on Android.
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When :ref:`Cross Compiling for Android with NVIDIA Nsight Tegra Visual Studio
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Edition`, this property specifies whether to build an executable as an
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application package on Android.
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When this property is set to true the executable when built for Android
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will be created as an application package. This property is initialized
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@ -1,15 +1,27 @@
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ANDROID_STL_TYPE
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----------------
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Set the Android property that defines the type of STL support for the project.
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When :ref:`Cross Compiling for Android with NVIDIA Nsight Tegra Visual Studio
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Edition`, this property specifies the type of STL support for the project.
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This is a string property that could set to the one of the following values:
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``none`` e.g. "No C++ Support"
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``system`` e.g. "Minimal C++ without STL"
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``gabi++_static`` e.g. "GAbi++ Static"
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``gabi++_shared`` e.g. "GAbi++ Shared"
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``gnustl_static`` e.g. "GNU libstdc++ Static"
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``gnustl_shared`` e.g. "GNU libstdc++ Shared"
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``stlport_static`` e.g. "STLport Static"
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``stlport_shared`` e.g. "STLport Shared"
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``none``
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No C++ Support
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``system``
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Minimal C++ without STL
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``gabi++_static``
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GAbi++ Static
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``gabi++_shared``
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GAbi++ Shared
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``gnustl_static``
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GNU libstdc++ Static
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``gnustl_shared``
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GNU libstdc++ Shared
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``stlport_static``
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STLport Static
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``stlport_shared``
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STLport Shared
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This property is initialized by the value of the
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variable:`CMAKE_ANDROID_STL_TYPE` variable if it is set when a target is created.
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:variable:`CMAKE_ANDROID_STL_TYPE` variable if it is set when a target is
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created.
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@ -0,0 +1,5 @@
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android-platform-modules
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------------------------
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* CMake now supports :ref:`Cross Compiling for Android` with simple
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toolchain files.
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@ -1,5 +1,11 @@
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CMAKE_ANDROID_API
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-----------------
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Default value for the :prop_tgt:`ANDROID_API` target property.
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See that target property for additional information.
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When :ref:`Cross Compiling for Android with NVIDIA Nsight Tegra Visual Studio
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Edition`, this variable may be set to specify the default value for the
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:prop_tgt:`ANDROID_API` target property. See that target property for
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additional information.
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Otherwise, when :ref:`Cross Compiling for Android`, this variable provides
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the Android API version number targeted. This will be the same value as
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the :variable:`CMAKE_SYSTEM_VERSION` variable for ``Android`` platforms.
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@ -1,5 +1,19 @@
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CMAKE_ANDROID_ARCH
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------------------
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Default value for the :prop_tgt:`ANDROID_ARCH` target property.
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See that target property for additional information.
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When :ref:`Cross Compiling for Android with NVIDIA Nsight Tegra Visual Studio
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Edition`, this variable may be set to specify the default value for the
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:prop_tgt:`ANDROID_ARCH` target property. See that target property for
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additional information.
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Otherwise, when :ref:`Cross Compiling for Android`, this variable provides
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the name of the Android architecture corresponding to the value of the
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:variable:`CMAKE_ANDROID_ARCH_ABI` variable. The architecture name
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may be one of:
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* ``arm``
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* ``arm64``
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* ``mips``
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* ``mips64``
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* ``x86``
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* ``x86_64``
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@ -0,0 +1,17 @@
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CMAKE_ANDROID_ARCH_ABI
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----------------------
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When :ref:`Cross Compiling for Android`, this variable specifies the
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target architecture and ABI to be used. Valid values are:
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* ``arm64-v8a``
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* ``armeabi-v7a``
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* ``armeabi-v6``
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* ``armeabi``
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* ``mips``
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* ``mips64``
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* ``x86``
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* ``x86_64``
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See also the :variable:`CMAKE_ANDROID_ARM_MODE` and
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:variable:`CMAKE_ANDROID_ARM_NEON` variables.
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@ -0,0 +1,7 @@
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CMAKE_ANDROID_ARM_MODE
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----------------------
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When :ref:`Cross Compiling for Android` and :variable:`CMAKE_ANDROID_ARCH_ABI`
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is set to one of the ``armeabi`` architectures, set ``CMAKE_ANDROID_ARM_MODE``
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to ``ON`` to target 32-bit ARM processors (``-marm``). Otherwise, the
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default is to target the 16-bit Thumb processors (``-mthumb``).
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@ -0,0 +1,6 @@
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CMAKE_ANDROID_ARM_NEON
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----------------------
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When :ref:`Cross Compiling for Android` and :variable:`CMAKE_ANDROID_ARCH_ABI`
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is set to ``armeabi-v7a`` set ``CMAKE_ANDROID_ARM_NEON`` to ``ON`` to target
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ARM NEON devices.
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@ -0,0 +1,7 @@
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CMAKE_ANDROID_NDK
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-----------------
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When :ref:`Cross Compiling for Android with the NDK`, this variable holds
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the absolute path to the root directory of the NDK. The directory must
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contain a ``platforms`` subdirectory holding the ``android-<api>``
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directories.
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@ -0,0 +1,13 @@
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CMAKE_ANDROID_NDK_TOOLCHAIN_VERSION
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-----------------------------------
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When :ref:`Cross Compiling for Android with the NDK`, this variable
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may be set to specify the version of the toolchain to be used
|
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as the compiler. The variable must be set to one of these forms:
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* ``<major>.<minor>``: GCC of specified version
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* ``clang<major>.<minor>``: Clang of specified version
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* ``clang``: Clang of most recent available version
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A toolchain of the requested version will be selected automatically to
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match the ABI named in the :variable:`CMAKE_ANDROID_ARCH_ABI` variable.
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@ -0,0 +1,6 @@
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CMAKE_ANDROID_STANDALONE_TOOLCHAIN
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----------------------------------
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|
||||
When :ref:`Cross Compiling for Android with a Standalone Toolchain`, this
|
||||
variable holds the absolute path to the root directory of the toolchain.
|
||||
The specified directory must contain a ``sysroot`` subdirectory.
|
||||
|
|
@ -1,5 +1,36 @@
|
|||
CMAKE_ANDROID_STL_TYPE
|
||||
----------------------
|
||||
|
||||
Default value for the :prop_tgt:`ANDROID_STL_TYPE` target property.
|
||||
See that target property for additional information.
|
||||
When :ref:`Cross Compiling for Android with NVIDIA Nsight Tegra Visual Studio
|
||||
Edition`, this variable may be set to specify the default value for the
|
||||
:prop_tgt:`ANDROID_STL_TYPE` target property. See that target property
|
||||
for additional information.
|
||||
|
||||
When :ref:`Cross Compiling for Android with the NDK`, this variable may be
|
||||
set to specify the STL variant to be used. The value may be one of:
|
||||
|
||||
``none``
|
||||
No C++ Support
|
||||
``system``
|
||||
Minimal C++ without STL
|
||||
``gabi++_static``
|
||||
GAbi++ Static
|
||||
``gabi++_shared``
|
||||
GAbi++ Shared
|
||||
``gnustl_static``
|
||||
GNU libstdc++ Static
|
||||
``gnustl_shared``
|
||||
GNU libstdc++ Shared
|
||||
``c++_static``
|
||||
LLVM libc++ Static
|
||||
``c++_shared``
|
||||
LLVM libc++ Shared
|
||||
``stlport_static``
|
||||
STLport Static
|
||||
``stlport_shared``
|
||||
STLport Shared
|
||||
|
||||
The default value is ``gnustl_static``. Note that this default differs from
|
||||
the native NDK build system because CMake may be used to build projects for
|
||||
Android that are not natively implemented for it and use the C++ standard
|
||||
library.
|
||||
|
|
|
|||
|
|
@ -0,0 +1,11 @@
|
|||
CMAKE_<LANG>_ANDROID_TOOLCHAIN_PREFIX
|
||||
-------------------------------------
|
||||
|
||||
When :ref:`Cross Compiling for Android` this variable contains the absolute
|
||||
path prefixing the toolchain GNU compiler and its binutils.
|
||||
|
||||
See also :variable:`CMAKE_<LANG>_ANDROID_TOOLCHAIN_SUFFIX`.
|
||||
|
||||
For example, the path to the linker is::
|
||||
|
||||
${CMAKE_CXX_ANDROID_TOOLCHAIN_PREFIX}ld${CMAKE_CXX_ANDROID_TOOLCHAIN_SUFFIX}
|
||||
|
|
@ -0,0 +1,7 @@
|
|||
CMAKE_<LANG>_ANDROID_TOOLCHAIN_SUFFIX
|
||||
-------------------------------------
|
||||
|
||||
When :ref:`Cross Compiling for Android` this variable contains the
|
||||
host platform suffix of the toolchain GNU compiler and its binutils.
|
||||
|
||||
See also :variable:`CMAKE_<LANG>_ANDROID_TOOLCHAIN_PREFIX`.
|
||||
Loading…
Reference in New Issue