Louis Dionne c2a42381c1 [libc++] Don't try to provide source_location on AppleClang 1403 ...

AppleClang 1403 has some bugs that prevent std::source_location from
working properly on it. Consequently, we XFAILed the unit test for
source_location with that compiler. However, we should also avoid
advertising that the feature is supported on that compiler, otherwise
our feature-test macros lie. This was noticed to break Boost.Asio
when building with a recent libc++ and AppleClang 14.0.3.

rdar://106863087

Differential Revision: https://reviews.llvm.org/D146837

2023-03-28 09:53:07 -04:00

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