[llvm-dev] Failed to build libunwind the libcxx's __config header

[Eric Fiselier via llvm-dev]

The bug here is that the default definition for __has_feature is withing a
#ifdef __cplusplus block, but the usage at the end of the file is not.
You're processing the __config header in C, not C++, so that's why you're
seeing this and most people are not.

I'll fix this up over the weekend.

/Eric
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