[SCM] libav/experimental: Re-add check for compilation failure with ebx clobber, and only set ebx_available if both "b" constraint and exb clobber code compile. This is to fix compilation with Mac OSX 10.5.8's gcc 4.0.1 in 64 bit mode (-m64) which only fails for ebx/rbx clobbers but not "b" constraints - this is probably a compiler bug.

[siretart at users.alioth.debian.org]

The following commit has been merged in the experimental branch:
commit e04a3c9613358b139f194df331ead6eba6369d8a
Author: Reimar Döffinger <Reimar.Doeffinger at gmx.de>
Date:   Wed Sep 30 21:57:13 2009 +0000

    Re-add check for compilation failure with ebx clobber, and only set
    ebx_available if both "b" constraint and exb clobber code compile.
    This is to fix compilation with Mac OSX 10.5.8's gcc 4.0.1 in 64
    bit mode (-m64) which only fails for ebx/rbx clobbers but not
    "b" constraints - this is probably a compiler bug.
    
    Originally committed as revision 20107 to svn://svn.ffmpeg.org/ffmpeg/trunk

diff --git a/configure b/configure
index 1c05d71..04f20e6 100755
--- a/configure
+++ b/configure
@@ -2163,7 +2163,7 @@ elif enabled x86; then
 EOF
 
     # check whether EBX is available on x86
-    check_asm ebx_available '""::"b"(0)'
+    check_asm ebx_available '""::"b"(0)' && check_asm ebx_available '"":::"%ebx"'
 
     # check whether more than 10 operands are supported
     check_cc <<EOF && enable ten_operands

-- 
Libav/FFmpeg packaging