On Tue, 6 Dec 2022 at 20:32, Gavin Ray wrote: > > Ah got it, didn't know that (handy, will save me duplicating a bunch of > attributes). > Thanks Jonathan!
The Clang doc acually show all the forms that can be used for each attribute: https://clang.llvm.org/docs/AttributeReference.html#may-alias "GNU" means __attribute__((may_alias)) and the C++11 and C2x columns show that [[gnu::may_alias]] is the right way to use it. Clang-specific attributes use clang:: instead e.g. https://clang.llvm.org/docs/AttributeReference.html#preserve-all