I'm committing this patch which correctly forces a flag on instead of off.
AG 2015-01-10 Anthony Green <gr...@moxielogic.com> * config/moxie/moxie.c (moxie_option_override): Fix forcing of mul.x availability for moxiebox configuration. Index: gcc/config/moxie/moxie.c =================================================================== --- gcc/config/moxie/moxie.c (revision 219421) +++ gcc/config/moxie/moxie.c (working copy) @@ -262,7 +262,7 @@ init_machine_status = moxie_init_machine_status; #ifdef TARGET_MOXIEBOX - target_flags &= ~MASK_HAS_MULX; + target_flags |= MASK_HAS_MULX; #endif }