Gentoo's Bugzilla –
Attachment 374546 Details for
Bug 506206media-video/ffmpeg-1.2.6 with sys-devel/gcc-4.8.2 on hardened - In function ‘dirac_get_arith_bit’: .../work/ffmpeg-1.2.6/libavcodec/dirac_arith.h:141:5: error: ‘asm’ operand has impossible constraints