[llvm-bugs] [Bug 44517] Stop adding new type traits builtins without adding __has_feature support for them

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=44517

Richard Smith <richard-llvm at metafoo.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |INVALID

--- Comment #4 from Richard Smith <richard-llvm at metafoo.co.uk> ---
Per our documentation (see the end of
https://clang.llvm.org/docs/LanguageExtensions.html#type-trait-primitives),
__has_builtin is the right way to detect type traits. __has_feature only
supports detecting old type traits for backwards compatibility reasons.

(Note that GCC also supports __has_builtin as a way to detect __is_same and
friends.)

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