Build: Disable -static-libgcc on MacOS building

[mapleFU]

On MacOS clang-13, it doesn't support -static-libgcc. So the code below might get:

clang: error: unsupported option '-static-libgcc'

This patch tries to fix that. This will make LLVM Clang failed, but AppleClang will not meet the problem.

[git-hulk]

LGTM, but I'm wondering why this error didn't happen on my side.

[mapleFU]

@git-hulk did you get a warning like:

clang: warning: argument unused during compilation: '-static-libstdc++'

I'm not sure would it warns that

[git-hulk]

@git-hulk did you get a warning like:

clang: warning: argument unused during compilation: '-static-libstdc++'

I'm not sure would it warns that

I cannot see this warning even building from scratch.

[mapleFU]

✗ clang++ --static-libgcc sample.cpp -a sample.a
clang-13: error: unsupported option '--static-libgcc'; did you mean '-static-libgcc'?
clang-13: error: no such file or directory: 'sample.a'
✗ clang++ -static-libgcc sample.cpp -a sample.a 
clang-13: error: no such file or directory: 'sample.a'
clang-13: error: unsupported option '-static-libgcc'

✗ clang++ --version
Homebrew clang version 13.0.1
Target: arm64-apple-darwin21.3.0
Thread model: posix
InstalledDir: /opt/homebrew/opt/llvm/bin

I guess there is something wrong with clang-13 on MacOS 12.2.1 . But I didn't research about it

[git-hulk]

@mapleFU I know the reason now. Coz I'm using AppleClang Not Clang :D.

[mapleFU]

Oh, so that :

if ((CMAKE_CXX_COMPILER_ID STREQUAL "GNU") OR (CMAKE_CXX_COMPILER_ID STREQUAL "Clang"))

will not step into. So no flags would be added here. Sounds reasonable

[git-hulk]

Yes, that's right.

[mapleFU]

I've update the description.

[git-hulk]

Thanks all, merging...