https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69865
--- Comment #8 from Bernd Edlinger <bernd.edlinger at hotmail dot de> --- (In reply to Jonathan Wakely from comment #7) > (In reply to Bernd Edlinger from comment #1) > > weird: > > If I add -std=c++14 (or any other c++ version, including -ansi) > > to the command line, it works. > > As documented in the manual: > > -trigraphs > Support ISO C trigraphs. The -ansi option (and -std options for > strict ISO C conformance) implies -trigraphs. > > Since the default is -std=gnu++14, -trigraphs is not enabled by default. Yes, but -trigraphs does not work, unless you explicictly add -std=gnu++14 -trigraphs to the command line. Same for -fno-extended-identifiers, it is overwritten in line 805. and the handling of flag_gnu89_inline uses the flag_isoc99 which is not defined correctly here.
