id	summary	reporter	owner	description	type	status	priority	component	version	resolution	keywords	cc	blockedby	blocking	reproduced	analyzed
1241	ffmpeg build is trying to compile 'neon' although this instruction set is disabled @ ./configure ( '--disable-neon' )	nadav		" == Environment ==
|| OS || Ubuntu 11.10 ||
|| RELEASE || 0.10.2.git ||
|| Platform || Android ||
|| neon || --disable-neon ||
|| optimizations || --disable-optimizations ||

 == Problem ==
|| Problem || ffmpeg build is trying to compile 'neon' although this instruction set is disabled @ ./configure ( '--disable-neon' ) ||
|| Symptom || libavcodec/libavcodec.so: undefined reference to `ff_pred16x16_vert_neon' ... ||
|| Analysis || The problem is in affect ONLY when compiling with '--disable-optimizations', going though the code, at multiple places the line 'if (HAVE_NEON)' is used, my assumption is that when the optimizer is on, the 'if (HAVE_NEON)' phrases are omitted from compilation, and, when the optimization is disabled, they ( neon phrases ) are not, and thus, the import table for neon instructions @ 'if (false)' phrases is added the neon instructions ( although they are not used by the code ), and this, leads to the undefined reference linker error. ||

"	defect	closed	normal	build system	git-master	fixed	arm neon build	notzed			1	0