"); //-->
DCMAKE_TOOLCHAIN_FILE
absolute or relative path to a cmake script which sets up all the toolchain related variables mentioned above
CMAKE给交叉编译预留了一个变量CMAKE_TOOLCHAIN_FILE,它定义了一个.cmake文件的路径,该文件里面设置了一系列CMAKE变量和属性,比如C_COMPILER,CXX_COMPILER等。.cmake文件的好处是一次编写多次使用,不同平台架构的交叉编译工具链可以编写一个独立的toolchain.cmake文件,而工程的CMakeLists.txt可以编写为通用格式,对工具链不可见。cmake脚本可以如下形式:
cmake -DCMAKE_TOOLCHAIN_FILE=./toolchains/ndk64-toolchain.cmake .. && make
cmake -DCMAKE_TOOLCHAIN_FILE=./toolchain/ndk32-toolchain.cmake .. && maketoolchain.cmake demo
set(CMAKE_SYSTEM_NAME Android) set(CMAKE_ANDROID_API 21) set(CMAKE_ANDROID_ARCH_ABI aarch64) set(CMAKE_ANDROID_STL_TYPE gnustl_static) set(TOOLCHAIN_PATH /opt/sdk/android-aarch64)# set(ANDROID_LIB_PATH ${TOOLCHAIN_PATH}/sysroot/usr/lib) set(CMAKE_C_COMPILER ${TOOLCHAIN_PATH}/bin/aarch64-linux-android-gcc) set(CMAKE_C_FLAGS "-D__ANDROID_API__=21 -fno-exceptions -O2 -fpie -fpic -fPIE -fPIC -pie -lm -Wl,-llog" CACHE STRING "" FORCE) set(CMAKE_CXX_COMPILER ${TOOLCHAIN_PATH}/bin/aarch64-linux-android-g++)set(CMAKE_CXX_FLAGS "-D__ANDROID_API__=21 -DANDROID_STL=gnustl_static -fno-exceptions -O2 -fpie -fpic -fPIE -fPIC -pie -std=c++11 -lm -lstdc++ -Wl,-llog" CACHE STRING "" FORCE)
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