[PATCH] D92336: repair cygwin build

[Jameson Nash via Phabricator via llvm-commits]

vtjnash added a comment.

I think with the move to newer C++ standards, some of the missing functionality in C could be replicated (or use the `_WIN32` code paths for `__CYGWIN__` in more places). I tried that for a bit, but it was pieces like `struct  sigaction`, `realpath`, and `getsid` missing, which are very platform-specific.

Thanks.


Repository:
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https://reviews.llvm.org/D92336