ubuntu下cmake 使用clang

安裝llvm、clang

sudo apt-get install llvm clang

clang命令會在/usr/bin/clang

cmake配置交叉編譯鏈

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命令引入交叉編譯配置即可

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

此時會顯示下面一些東西，表示編譯器已經換成了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： 如果已經運行過cmake，要先將cmake生成的文件刪掉。

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