jyknight added a comment.

I'm not sure we should be populating this.

The _value_ is determined by what libc supports, so it probably needs to be 
left up to libc to define it.

In glibc, this define is set by the file /usr/include/stdc-predef.h, which GCC 
implicitly includes into all TUs whether they include libc headers or not. 
(Clang almost got that feature too in https://reviews.llvm.org/D34158 but it 
was reverted due to some test failures)


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D106577/new/

https://reviews.llvm.org/D106577

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