https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104208
--- Comment #8 from Florian Weimer <fw at gcc dot gnu.org> --- (In reply to Peter Bergner from comment #7) > Florian, can you confirm that -mlong-double-64 comes after the > -mabi=ibmlongdouble option in the problematical glibc build? The mailing list post referenced in comment 0 quotes the full command line. Stripped to the vaguely ABI-ish flags, it's -std=gnu11 -fgnu89-inline -O2 -g -m64 -mabi=ibmlongdouble -frounding-math -fmath-errno -mno-gnu-attribute -mlong-double-64 So yes, it comes afterwards for this particular command line (and also in general I think, but we'll know for sure only once we can get past this particular error).