[Bug lto/54231] LTO generates code for the wrong CPU if different options used

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54231

--- Comment #8 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-08-13 
08:59:18 UTC ---
If you do something like

 gcc -c t1.c -mavx -flto
 gcc -c t2.c -msse2 -flto
 gcc t1.o t2.o -flto

then the link step will use -mavx -msse2, that is, target options are
concatenated.