http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55185
--- Comment #1 from DaBler <dabler at gmail dot com> 2012-12-04 20:55:17 UTC --- I have same problem here: $ gcc -O3 -mno-sse -xc - <<END > #include <stdlib.h> > int main(){return 0;} > END In file included from <stdin>:1:0: /usr/include/stdlib.h: In function ‘atof’: /usr/include/stdlib.h:280:1: error: SSE register return with SSE disabled