尝试编译 C++ modules 官方测试单元失败

[fumeboy]

环境 macOS 12.3.1 ，xmake v2.6.7+202206171410
测试用例地址 https://github.com/xmake-io/xmake/tree/master/tests/projects/c%2B%2B/modules/hello
错误信息：

error: error: module interface compilation requires '-std=c++20' or '-fmodules-ts'
1 error generated.

完整命令：

"/usr/bin/xcrun -sdk macosx clang" -c -Qunused-arguments -arch x86_64 -mmacosx-version-min=12.3 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.3.sdk -std=c++20 -fmodules -fimplicit-modules -fimplicit-module-maps -fprebuilt-module-path=build/.gens/rules/modules/cache --precompile -x c++-module -fmodules-cache-path=build/.gens/rules/modules/cache -o build/.gens/rules/modules/cache/hello.pcm src/hello.mpp

[waruqi]

mac自带的 clang 是不支持的，得切到 llvm-clang