https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57125
--- Comment #9 from Mike Frysinger <vapier at gentoo dot org> ---
after having the backport deployed in Gentoo, we found an edge case with the
fix in trunk ...
we still have this rule in gcc/Makefile.in:
# Generated source files for gengtype. Prepend inclusion of
# bconfig.h because AIX requires _LARGE_FILES to be defined before
# any system header is included.
gengtype-lex.c : gengtype-lex.l
-$(FLEX) $(FLEXFLAGS) -o$@ $< && { \
echo '#include "bconfig.h"' > $@.tmp; \
cat $@ >> $@.tmp; \
mv $@.tmp $@; \
}
so even though gengtype-lex.l was adapted to not include bconfig.h when
HOST_GENERATOR_FILE is defined, and the bconfig.h dep on that file was dropped,
the source still tries to always include it for both host & build modes.
i don't really understand the comment ... it seems to me that the lex file will
include the right config.h header files first already, so we should drop the
explicit insertion of bconfig.h here.
