http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55925
--- Comment #5 from Uros Bizjak <ubizjak at gmail dot com> 2013-01-14 21:53:16 UTC --- (In reply to comment #4) > I tried building several compilers (4.7.2), none of which understand the > '-mfxsr' option. One was configured with: True. -mfxsr option was added to 4.8.0. After that, I build the mingw-w64 library, went back to my GCC build dir, and did: make && make install This command should first build a 4.8.0 crosscompiler, and then compile the library with the newly built compiler. The command should look like: /home/uros/gcc-build/./gcc/xgcc -B/home/uros/gcc-build/./gcc/ -B/usr/local/x86_64-unknown-linux-gnu/bin/ -B/usr/local/x86_64-unknown-linux-gnu/lib/ -isystem /usr/local/x86_64-unknown-linux-gnu/include -isystem /usr/local/x86_64-unknown-linux-gnu/sys-include -g -O2 -O2 -g -O2 -DIN_GCC -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition -isystem ./include -fpic -mlong-double-80 -g -DIN_LIBGCC2 -fbuilding-libgcc -fno-stack-protector -fpic -mlong-double-80 -I. -I. -I../.././gcc -I../../../gcc-svn/trunk/libgcc -I../../../gcc-svn/trunk/libgcc/. -I../../../gcc-svn/trunk/libgcc/../gcc -I../../../gcc-svn/trunk/libgcc/../include -I../../../gcc-svn/trunk/libgcc/config/libbid -DENABLE_DECIMAL_BID_FORMAT -DHAVE_CC_TLS -DUSE_TLS -o crtfastmath.o -MT crtfastmath.o -MD -MP -MF crtfastmath.dep -mfxsr -msse -c ../../../gcc-svn/trunk/libgcc/config/i386/crtfastmath.c As you can see, using -mfxsr does not fail here.
