安装llvm、clang

sudo apt-get install llvm clang

clang命令会在/usr/bin/clang

cmake配置交叉编译链

建立linux.toolchain.cmake文件

cmake_minimum_required( VERSION 2.6.3 )set(CMAKE_SYSTEM_NAME Linux )SET (CMAKE_C_COMPILER             "/usr/bin/clang")SET (CMAKE_C_FLAGS                "-Wall -std=c99")SET (CMAKE_C_FLAGS_DEBUG          "-g")SET (CMAKE_C_FLAGS_MINSIZEREL     "-Os -DNDEBUG")SET (CMAKE_C_FLAGS_RELEASE        "-O4 -DNDEBUG")SET (CMAKE_C_FLAGS_RELWITHDEBINFO "-O2 -g")SET (CMAKE_CXX_COMPILER             "/usr/bin/clang++")SET (CMAKE_CXX_FLAGS                "-Wall")SET (CMAKE_CXX_FLAGS_DEBUG          "-g")SET (CMAKE_CXX_FLAGS_MINSIZEREL     "-Os -DNDEBUG")SET (CMAKE_CXX_FLAGS_RELEASE        "-O4 -DNDEBUG")SET (CMAKE_CXX_FLAGS_RELWITHDEBINFO "-O2 -g")SET (CMAKE_AR      "/usr/bin/llvm-ar")SET (CMAKE_LINKER  "/usr/bin/llvm-ld")SET (CMAKE_NM      "/usr/bin/llvm-nm")SET (CMAKE_OBJDUMP "/usr/bin/llvm-objdump")SET (CMAKE_RANLIB  "/usr/bin/llvm-ranlib")

cmake命令引入交叉编译配置即可

cmake  -DCMAKE_TOOLCHAIN_FILE=${CURRENT_SCRIPT_DIR}/linux.toolchain.cmake  .

此时会显示下面一些东西，表示编译器已经换成了clang

-- The C compiler identification is Clang 3.8.0-- The CXX compiler identification is Clang 3.8.0-- Check for working C compiler: /usr/bin/clang-- Check for working C compiler: /usr/bin/clang -- works-- Detecting C compiler ABI info-- Detecting C compiler ABI info - done-- Detecting C compile features-- Detecting C compile features - done-- Check for working CXX compiler: /usr/bin/clang++-- Check for working CXX compiler: /usr/bin/clang++ -- works-- Detecting CXX compiler ABI info-- Detecting CXX compiler ABI info - done-- Detecting CXX compile features-- Detecting CXX compile features - done

注意： 如果已经运行过cmake，要先将cmake生成的文件删掉。

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