[PATCH] D67159: [clang] New __attribute__((__clang_builtin)).

[Roman Lebedev via Phabricator via cfe-commits]

lebedev.ri added a comment.

In D67159#1659084 <https://reviews.llvm.org/D67159#1659084>, @simon_tatham wrote:

> On the general discomfort with this attribute existing: I'd be happy to lock it down, or mark it as "not recommended" in some way, if that's any help. I don't personally intend any use of it outside a single system header file (namely `arm_mve.h`, which D67161 <https://reviews.llvm.org/D67161> will introduce the initial version of).


I think that would at least be something - make it print big fat undisableable warning if used outside of a system header.

> A warning along the lines of "don't use this!", automatically suppressed by the usual change of warning settings in system headers, would seem like a perfectly reasonable precaution, for example.




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  https://reviews.llvm.org/D67159/new/

https://reviews.llvm.org/D67159