The SCons build using GCC on Mac OS X is failing now. The SCons build with clang on Mac OS X completes though.

$ scons
[...]
  Linking build/darwin-x86_64-debug/mesa/drivers/osmesa/libosmesa.dylib ...
ld: duplicate symbol _mem_ctx in build/darwin-x86_64-debug/mesa/libmesa.a(driverfuncs.os) and build/darwin-x86_64-debug/mesa/drivers/osmesa/osmesa.os for architecture x86_64
collect2: ld returned 1 exit status

$ gcc --version
i686-apple-darwin11-llvm-gcc-4.2 (GCC) 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.9.00)
Copyright (C) 2007 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

299acac849eb8506de9760c94c6e8e8b1046d909 is the first bad commit
commit 299acac849eb8506de9760c94c6e8e8b1046d909
Author: Anuj Phogat <anuj.phogat@gmail.com>
Date:   Fri Aug 31 13:51:39 2012 -0700

    _mesa_meta_GenerateMipmap: Support all texture targets by generating shaders at runtime
    
    glsl path of _mesa_meta_GenerateMipmap() function would require different fragment
    shaders depending on the texture target. This patch adds the code to generate
    appropriate fragment shader programs at run time.
    Fixes https://bugs.freedesktop.org/show_bug.cgi?id=54296
    
    V2: Removed the code for integer textures as ARB is planning to
        disallow automatic mipmap generation for integer textures.
        Now using ralloc_asprintf in setup_glsl_generate_mipmap().
    
    NOTE: This is a candidate for stable branches.
    
    Signed-off-by: Anuj Phogat <anuj.phogat@gmail.com>
    Reviewed-by: Brian Paul <brianp@vmware.com>

:040000 040000 040e6b344d415c31dc9558b21b5878d600621bf5 0eac98ab198e9e2a6b423a6a911781f46c186519 M	src
bisect run success