[PATCH] D91747: [Clang] Add __STDCPP_THREADS__ to standard predefine macros

[Zequan Wu via Phabricator via cfe-commits]

zequanwu added a comment.

In D91747#2423960 <https://reviews.llvm.org/D91747#2423960>, @rnk wrote:

> If we believe the standard says that the compiler is supposed to set `__STDCPP_THREADS__`, then I think the libc++ #error needs to be adjusted. libcxxabi, or any other client, should be able to define `_LIBCPP_HAS_NO_THREADS`, and it should work, even if the compiler thinks they are allowed.

So, we could remove the checking for if `__STDCPP_THREADS__` and `_LIBCPP_HAS_NO_THREADS` are both set. And let libcxx adds flag `-mthread-model single` to use single thread (but this is compiler specific flag, might need a better solution).


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https://reviews.llvm.org/D91747