[PATCH] D99852: [Driver] Detect libstdc++ include paths for native gcc (-m32 and -m64) on Debian i386

[Fangrui Song via Phabricator via cfe-commits]

MaskRay added a comment.

>From an upstream multiarch build of gcc, the libstdc++ search paths are

  /tmp/opt/gcc-debug/lib/gcc/x86_64-pc-linux-gnu/11.0.1/../../../../include/c++/11.0.1
  /tmp/opt/gcc-debug/lib/gcc/x86_64-pc-linux-gnu/11.0.1/../../../../include/c++/11.0.1/x86_64-pc-linux-gnu
  /tmp/opt/gcc-debug/lib/gcc/x86_64-pc-linux-gnu/11.0.1/../../../../include/c++/11.0.1/backward

(this is similar to cross gcc on Debian)

If you specify `--target=x86_64-linux-gnu` and install it to `/usr`, the paths will become.

  /usr/include/c++/11.0.1
  /usr/include/c++/11.0.1/x86_64-linux-gnu
  /usr/include/c++/11.0.1/backward

If Debian can drop the incdir patch for native gcc, clang driver can still detect the libstdc++ search paths.


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D99852/new/

https://reviews.llvm.org/D99852