[PATCH] D137043: [clang] add implicit include for Linux/gnu compatibility

[Fangrui Song via Phabricator via cfe-commits]

MaskRay added a comment.

In GCC, a `*-linux*` triple (this applies to musl as well) gets `c_target_objs="${c_target_objs} glibc-c.o"` from `gcc/config.gcc`.
`"stdc-predef.h"` is defined in `glibc-c.cc`. There is no `musl-c.cc`.
Even if musl does provide `stdc-predef.h` and GCC configured on `*-linux-musl` does include `stdc-predef.h`, this may be an unexpected use.


Repository:
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  https://reviews.llvm.org/D137043/new/

https://reviews.llvm.org/D137043