https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102821
--- Comment #2 from Pavel M <pavel.morozkin at gmail dot com> --- Addition to "Notes" above. 3. C11, 5.1.1.3 Diagnostics, 1: > A conforming implementation shall produce at least one diagnostic message > (identified in an implementation-defined manner) if a preprocessing > translation unit or translation unit contains a violation of any syntax rule > or constraint, even if the behavior is also explicitly specified as undefined > or implementation-defined.
