C++ 在 CMake 中，如何测试编译器是否为 Clang？
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In CMake, how can I test if the compiler is Clang?
提问by leedm777
We have a set of cross-platform CMake build scripts, and we support building with Visual C++and GCC.
我们有一套跨平台的 CMake 构建脚本，我们支持使用Visual C++和GCC构建。
We're trying out Clang, but I can't figure out how to test whether or not the compiler is Clang with our CMake script.
我们正在尝试Clang，但我不知道如何使用我们的 CMake 脚本测试编译器是否是 Clang 。
What should I test to see if the compiler is Clang or not? We're currently using MSVCand CMAKE_COMPILER_IS_GNU<LANG>to test for Visual C++ and GCC, respectively.
我应该测试什么来查看编译器是否是 Clang？我们目前分别使用MSVC和CMAKE_COMPILER_IS_GNU<LANG>测试 Visual C++ 和 GCC。
回答by sakra
A reliable check is to use the CMAKE_<LANG>_COMPILER_IDvariables. E.g., to check the C++ compiler:
可靠的检查是使用CMAKE_<LANG>_COMPILER_ID变量。例如，要检查 C++ 编译器：
if (CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
# using Clang
elseif (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
# using GCC
elseif (CMAKE_CXX_COMPILER_ID STREQUAL "Intel")
# using Intel C++
elseif (CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
# using Visual Studio C++
endif()
These also work correctly if a compiler wrapper like ccacheis used.
如果使用像ccache这样的编译器包装器，这些也能正常工作。
As of CMake 3.0.0 the CMAKE_<LANG>_COMPILER_IDvalue for Apple-provided Clang is now AppleClang. To test for both the Apple-provided Clang and the regular Clang use the following if condition:
从 CMake 3.0.0 开始CMAKE_<LANG>_COMPILER_ID，Apple 提供的 Clang 的值现在是AppleClang. 要测试 Apple 提供的 Clang 和常规 Clang，请使用以下 if 条件：
if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
# using regular Clang or AppleClang
endif()
Also see the AppleClang policy description.
另请参阅AppleClang 政策说明。
回答by arrowd
回答by Antonio
Just to avoid any mispelling problem, I am using this:
为了避免任何拼写错误的问题，我使用了这个：
if (CMAKE_CXX_COMPILER_ID MATCHES "[cC][lL][aA][nN][gG]") #Case insensitive match
set(IS_CLANG_BUILD true)
else ()
set(IS_CLANG_BUILD false)
endif ()
For making the regex case insensitive, I tried everything herewithout success (doesn't seem to be supported in CMake).
为了使正则表达式不区分大小写，我在这里尝试了所有方法都没有成功（CMake 似乎不支持）。
回答by Searene
This is a slightly more detailed answer for cmake newbies, modified from sakra's answer, just append the following lines toCMakeLists.txt:
这是针对 cmake 新手的稍微更详细的答案，根据 sakra 的答案进行了修改，只需将以下行附加到CMakeLists.txt：
if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
MESSAGE("Clang")
elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
MESSAGE("GNU")
elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Intel")
MESSAGE("Intel")
elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
MESSAGE("MSVC")
endif()
Then run cmake .in the folder where CMakeLists.txt lies. Then you will see a bunch of outputs along with your answer.
然后cmake .在 CMakeLists.txt 所在的文件夹中运行。然后你会看到一堆输出以及你的答案。
...
-- Detecting CXX compile features
-- Detecting CXX compile features - done
GNU
-- Configuring done
-- Generating done
...
