MacOs：如何更改 C++ 编译器和 stdlib
[英]MacOs: How to change the C++ compiler and stdlib
问题描述
I have a C++ project with CMake (and conan) and I want to switch the compiler to GCC-10, and its corresponding stdlibc++.
我有一个带有 CMake（和 conan）的 C++ 项目，我想将编译器切换到 GCC-10 及其相应的 stdlibc++。 How do I do this on MacOS (Big Sur).我如何在 MacOS (Big Sur) 上执行此操作。
Specifying -DCMAKE_CXX_COMPILER= which g++-10 in the cmake configure command successfully makes the switch to the g++ 10 compiler that I have on my system (installed with brew).在 cmake configure 命令中指定 -DCMAKE_CXX_COMPILER= which g++-10成功地切换到我的系统上的 g++ 10 编译器（与 brew 一起安装）。 However, I do not see any indicator that the includes and the stdlib are changed.但是，我没有看到任何指示包含和 stdlib 已更改。
My buidld command looks like:我的 buidld 命令看起来像：
/usr/local/bin/g++-10 -DCONCORE_USE_GLM=1 -DCONCORE_USE_OPENMP=1 -DCONCORE_USE_TBB=1 -DRC_USE_RTTI -I../test/. -I../test/../include -I../include -isystem /usr/local/Cellar/tbb/2020_U3/include -isystem /Users/lucteo/.conan/data/Catch2/2.11.0/catchorg/stable/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include -isystem /Users/lucteo/.conan/data/rapidcheck/20200131/_/_/package/d2dbafdccc1ddd834eb76a31bdfdc6cc51e23ec1/include -fsanitize=address -fsanitize=undefined -D_GLIBCXX_USE_CXX11_ABI=1 -O3 -DNDEBUG -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk -Wall -std=gnu++17 -MD -MT test/CMakeFiles/test.concore.dir/func/test_serializers.cpp.o -MF test/CMakeFiles/test.concore.dir/func/test_serializers.cpp.o.d -o test/CMakeFiles/test.concore.dir/func/test_serializers.cpp.o -c ../test/func/test_serializers.cpp
What is the best way to switch the compiler and stdlib?切换编译器和 stdlib 的最佳方法是什么？
1 个解决方案
解决方案1
0 2020-09-27 18:14:19
To change stdlib you need to provide the -stdlib=stdlibc++ flag to the compiler in order to activate stdlibc++.要更改 stdlib，您需要向编译器提供-stdlib=stdlibc++标志以激活 stdlibc++。 This can be done through ccmake (turn on advanced mode (with t), and set CMAKE_CXX_FLAGS to -stdlib=stdlibc++ ), or through an equivalent directive in your CMakeLists.txt:这可以通过 ccmake（打开高级模式（使用 t），并将CMAKE_CXX_FLAGS设置为-stdlib=stdlibc++ ）或通过 CMakeLists.txt 中的等效指令来完成：
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=stdlibc++")
You also may need set(CMAKE_EXE_LINKER_FLAGS "-stdlib=stdlibc++") :您可能还需要set(CMAKE_EXE_LINKER_FLAGS "-stdlib=stdlibc++") ：
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -stdlib=stdlibc++")
To update your conan profile (say default ) use the command as follows:要更新您的柯南配置文件（例如default ），请使用以下命令：
conan profile update settings.compiler.libcxx=stdlibc++ default
Note: -stdlib is a Clang flag and will not work with any version of GCC ever released.注意： -stdlib是一个 Clang 标志，不适用于任何已发布的 GCC 版本。 GCC always uses libstdc++ unless you tell it to use no standard library at all with the -nostdlib option (in which case you either need to avoid using any standard library features, or use -I and -L and -l flags to point it to an alternative set of header and library files). GCC 总是使用libstdc++除非您通过-nostdlib选项告诉它根本不使用标准库（在这种情况下，您要么需要避免使用任何标准库功能，要么使用-I和-L和-l标志将其指向一组替代的头文件和库文件）。
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