Set CONFIG_EBP_AVAILABLE, CONFIG_EBX_AVAILABLE for FFmpeg

After FFmpeg r8549 these variables are used in libavcodec to determine
whether x86 inline asm sections using these registers or requiring a
certain total number of total free registers are enabled. Because they
were not set by MPlayer configure some H264 decoding optimizations were
disabled after that FFmpeg version. This change sets the variables to
true unconditionally which should restore previous behavior. Adding
proper detection is left for later.

EBX should always be available because internal libavcodec is never
compiled with PIC. However if -fomit-frame-pointer is not used because
of --enable-debug then EBP is not available. Thus proper detection would
be preferable to fix compilation with --enable-debug on x86. Currently
the variables are also set on non-x86 which should be harmless even if
somewhat ugly.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@22848 b3059339-0415-0410-9bf9-f77b7e298cf2

1 files changed, 4 insertions, 0 deletions

diff --git a/configure b/configure
index fc4084c53e..7be1c14e60 100755
--- a/configure
+++ b/configure
@@ -8005,6 +8005,10 @@ $_def_libavutil_so
 /* Use libavformat's muxers */
 $_def_muxers
 
+/* Use these registers in FFmpeg x86 inline asm. No proper detection yet. */
+#define CONFIG_EBX_AVAILABLE 1
+#define CONFIG_EBP_AVAILABLE 1
+
 #define CONFIG_GPL 1
 
 /* Use amr codecs from libavcodec (requires amr sources) */