https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109882
Jonathan Wakely <redi at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2023-05-16 Ever confirmed|0 |1 --- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> --- The header is included since r13-2677-g0abc63a5ea4550 (and r12-9342-g0cec4e9cd44e25 on the branch), and not including it would mean not being able to annotate atomic<shared_ptr<T>>. I agree with Andrew, this is a bug in libsanitizer. The correct way to use __has_feature in a public header is to test with #ifdef __has_feature not to define the fallback definition.