https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67854
--- Comment #1 from joseph at codesourcery dot com <joseph at codesourcery dot com> --- I wonder if this is yet another issue with macros from system headers (bool being defined in a system header to expand to _Bool) ... maybe we need a systematic review of diagnostic locations in the C-family front ends to identify such cases where the diagnostic relates to a property of the use of the (type / expression) macro from a system header, not to a property of that (type / expression) itself, and so system-header suppression should only apply if the use itself is in a system header.
