mstorsjo added a comment.

In D81795#2092878 <https://reviews.llvm.org/D81795#2092878>, @rjmccall wrote:

> Seems reasonable; GCC is the "system compiler" for this platform.   Does 
> `isWindowsGNUEnvironment` exactly track the condition that GCC uses?  It's 
> just MinGW, not Cygwin?


Yes: 
https://github.com/llvm/llvm-project/blob/d700237f1aa1bc05d584a0f50fdad89370e17987/llvm/include/llvm/ADT/Triple.h#L563-L574

And the corresponding change in GCC, 
https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=99e7ad2ec6a78a6a55cefaa952b57870594c08ae,
 only changed it for MinGW, not Cygwin (and the corresponding files for cygwin 
don't have that bit set).


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D81795/new/

https://reviews.llvm.org/D81795



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