# # CMake Toolchain file for crosscompiling Android / aarch64 # # This can be used when running cmake in the following way: # cd build/ # cmake .. -DCMAKE_TOOLCHAIN_FILE=contrib/cross-aarch64-android.cmake # set(ANDROID_API_VER 24) set(ABARCH1 arm64) set(CMAKE_SYSTEM_PROCESSOR aarch64) set(NDK /opt/android/ndk/21.1.6352462/) set(CROSS_SYSROOT "${NDK}/platforms/android-${ANDROID_API_VER}/arch-${ABARCH1}") set(BUILD_ARCH linux-x86_64) # # Rest should be computed from the above # set(TC_PATH ${NDK}/toolchains/llvm/prebuilt/${BUILD_ARCH}) set(TC_BASE ${TC_PATH}/bin/${CMAKE_SYSTEM_PROCESSOR}-linux-android) set(PLATFORM android) set(CMAKE_SYSTEM_NAME Linux) set(CMAKE_C_COMPILER "${TC_BASE}${ANDROID_API_VER}-clang") set(CMAKE_CXX_COMPILER "${TC_BASE}${ANDROID_API_VER}-clang++") set(CMAKE_STAGING_PREFIX "${CROSS_SYSROOT}") # # Different build system distros set release optimization level to different # things according to their local policy, eg, Fedora is -O2 and Ubuntu is -O3 # here. Actually the build system's local policy is completely unrelated to # our desire for cross-build release optimization policy for code built to run # on a completely different target than the build system itself. # # Since this goes last on the compiler commandline we have to override it to a # sane value for cross-build here. Notice some gcc versions enable broken # optimizations with -O3. # if (CMAKE_BUILD_TYPE MATCHES RELEASE OR CMAKE_BUILD_TYPE MATCHES Release OR CMAKE_BUILD_TYPE MATCHES release) set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -O2") set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -O2") endif() #-nostdlib SET(CMAKE_C_FLAGS "-DGCC_VER=\"\\\"$(GCC_VER)\\\"\" -DARM64=1 -D__LP64__=1 -Os -g3 -fpie -mstrict-align -fPIC -ffunction-sections -fdata-sections -D__ANDROID_API__=${ANDROID_API_VER} -Wno-pointer-sign" CACHE STRING "" FORCE) set(CMAKE_FIND_ROOT_PATH "${CROSS_SYSROOT}") # Adjust the default behavior of the FIND_XXX() commands: # search programs in the host environment only. set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER) # Search headers and libraries in the target environment only. set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY) set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)