tra added inline comments.
================
Comment at: lib/Frontend/InitPreprocessor.cpp:1126
Builder.defineMacro("__linux__");
+ if (AuxTriple.getEnvironment() == llvm::Triple::GNU)
+ Builder.defineMacro("__gnu_linux__");
----------------
AFAICT, we always define `__gnu_linix__` on Linux:
https://github.com/llvm-mirror/clang/blob/master/lib/Basic/Targets/OSTargets.h#L306
I think it should be the case here, too.
https://reviews.llvm.org/D51441
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