使用 clang 编译

使用 clang 编译#

使用 CMake 构建时，可以设置 C 和 C++编译器。这个示例与 hello-cmake 示例相同，只是它展示了从默认的 gcc 更改为 clang 的最基本方法。

CMake 提供了选项来控制用于编译和链接你代码的程序。这些程序包括：

  • CMAKE_C_COMPILER - 用于编译 c 代码的程序。

  • CMAKE_CXX_COMPILER - 用于编译 c++代码的程序。

  • CMAKE_LINKER - 用于链接你的二进制文件的程序。

设置标志#

如构建类型示例所述，您可以使用 cmake gui 或通过命令行传递来设置 CMake 选项。

以下是通过命令行传递编译器的示例。

cmake .. -DCMAKE_C_COMPILER=clang-3.6 -DCMAKE_CXX_COMPILER=clang++-3.6

设置这些选项后，运行 make clang 将用于编译您的二进制文件。这可以从 make 输出中的以下行中看到

/usr/bin/clang++-3.6     -o CMakeFiles/hello_cmake.dir/main.cpp.o -c /home/matrim/workspace/cmake-examples/01-basic/I-compiling-with-clang/main.cpp
Linking CXX executable hello_cmake
/usr/bin/cmake -E cmake_link_script CMakeFiles/hello_cmake.dir/link.txt --verbose=1
/usr/bin/clang++-3.6       CMakeFiles/hello_cmake.dir/main.cpp.o  -o hello_cmake -rdynamic

构建示例#

$ mkdir build.clang

$ cd build.clang/

$ cmake .. -DCMAKE_C_COMPILER=clang-3.6 -DCMAKE_CXX_COMPILER=clang++-3.6
-- The C compiler identification is Clang 3.6.0
-- The CXX compiler identification is Clang 3.6.0
-- Check for working C compiler: /usr/bin/clang-3.6
-- Check for working C compiler: /usr/bin/clang-3.6 -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/clang++-3.6
-- Check for working CXX compiler: /usr/bin/clang++-3.6 -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Configuring done
-- Generating done
-- Build files have been written to: /home/matrim/workspace/cmake-examples/01-basic/I-compiling-with-clang/build.clang

$ make VERBOSE=1
/usr/bin/cmake -H/home/matrim/workspace/cmake-examples/01-basic/I-compiling-with-clang -B/home/matrim/workspace/cmake-examples/01-basic/I-compiling-with-clang/build.clang --check-build-system CMakeFiles/Makefile.cmake 0
/usr/bin/cmake -E cmake_progress_start /home/matrim/workspace/cmake-examples/01-basic/I-compiling-with-clang/build.clang/CMakeFiles /home/matrim/workspace/cmake-examples/01-basic/I-compiling-with-clang/build.clang/CMakeFiles/progress.marks
make -f CMakeFiles/Makefile2 all
make[1]: Entering directory `/home/matrim/workspace/cmake-examples/01-basic/I-compiling-with-clang/build.clang'
make -f CMakeFiles/hello_cmake.dir/build.make CMakeFiles/hello_cmake.dir/depend
make[2]: Entering directory `/home/matrim/workspace/cmake-examples/01-basic/I-compiling-with-clang/build.clang'
cd /home/matrim/workspace/cmake-examples/01-basic/I-compiling-with-clang/build.clang && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /home/matrim/workspace/cmake-examples/01-basic/I-compiling-with-clang /home/matrim/workspace/cmake-examples/01-basic/I-compiling-with-clang /home/matrim/workspace/cmake-examples/01-basic/I-compiling-with-clang/build.clang /home/matrim/workspace/cmake-examples/01-basic/I-compiling-with-clang/build.clang /home/matrim/workspace/cmake-examples/01-basic/I-compiling-with-clang/build.clang/CMakeFiles/hello_cmake.dir/DependInfo.cmake --color=
Dependee "/home/matrim/workspace/cmake-examples/01-basic/I-compiling-with-clang/build.clang/CMakeFiles/hello_cmake.dir/DependInfo.cmake" is newer than depender "/home/matrim/workspace/cmake-examples/01-basic/I-compiling-with-clang/build.clang/CMakeFiles/hello_cmake.dir/depend.internal".
Dependee "/home/matrim/workspace/cmake-examples/01-basic/I-compiling-with-clang/build.clang/CMakeFiles/CMakeDirectoryInformation.cmake" is newer than depender "/home/matrim/workspace/cmake-examples/01-basic/I-compiling-with-clang/build.clang/CMakeFiles/hello_cmake.dir/depend.internal".
Scanning dependencies of target hello_cmake
make[2]: Leaving directory `/home/matrim/workspace/cmake-examples/01-basic/I-compiling-with-clang/build.clang'
make -f CMakeFiles/hello_cmake.dir/build.make CMakeFiles/hello_cmake.dir/build
make[2]: Entering directory `/home/matrim/workspace/cmake-examples/01-basic/I-compiling-with-clang/build.clang'
/usr/bin/cmake -E cmake_progress_report /home/matrim/workspace/cmake-examples/01-basic/I-compiling-with-clang/build.clang/CMakeFiles 1
[100%] Building CXX object CMakeFiles/hello_cmake.dir/main.cpp.o
/usr/bin/clang++-3.6     -o CMakeFiles/hello_cmake.dir/main.cpp.o -c /home/matrim/workspace/cmake-examples/01-basic/I-compiling-with-clang/main.cpp
Linking CXX executable hello_cmake
/usr/bin/cmake -E cmake_link_script CMakeFiles/hello_cmake.dir/link.txt --verbose=1
/usr/bin/clang++-3.6       CMakeFiles/hello_cmake.dir/main.cpp.o  -o hello_cmake -rdynamic
make[2]: Leaving directory `/home/matrim/workspace/cmake-examples/01-basic/I-compiling-with-clang/build.clang'
/usr/bin/cmake -E cmake_progress_report /home/matrim/workspace/cmake-examples/01-basic/I-compiling-with-clang/build.clang/CMakeFiles  1
[100%] Built target hello_cmake
make[1]: Leaving directory `/home/matrim/workspace/cmake-examples/01-basic/I-compiling-with-clang/build.clang'
/usr/bin/cmake -E cmake_progress_start /home/matrim/workspace/cmake-examples/01-basic/I-compiling-with-clang/build.clang/CMakeFiles 0

$ ./hello_cmake
Hello CMake!
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