Commits on Mar 13, 2024

1. [libc++] Enable availability based on the compiler instead of __has_e… …

   …xtension (llvm#84065)
   
   __has_extension(...) doesn't work as intended when -pedantic-errors is
   used with Clang. With that flag, __has_extension(...) is equivalent to
   __has_feature(...), which means that checks like
   
       __has_extension(pragma_clang_attribute_external_declaration)
   
   will return 0. In turn, this has the effect of disabling availability
   markup in libc++, which is undesirable.
   
   rdar://124078119
   (cherry picked from commit 292a28d)

   

   ldionne authored and tstellar committed Mar 13, 2024
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