Adding a patch for mesa, for it to build on the loongson2f.

svn path=/nixpkgs/trunk/; revision=31749

pkgs/development/libraries/mesa/default.nix

@@ -17,7 +17,8 @@ stdenv.mkDerivation {
     sha256 = "0msk1fh4yw4yi7z37v75vhpa23z49lkwgin6drczbihbqsl6lx2p";
   };
 
-  patches = [ ./swrast-settexbuffer.patch ];
+  patches = [ ./swrast-settexbuffer.patch ] ++ stdenv.lib.optional
+    (stdenv.system == "mips64-linux") ./mips_wmb.patch;
 
   prePatch = "patchShebangs .";
 

pkgs/development/libraries/mesa/mips_wmb.patch

@@ -0,0 +1,16 @@
+rixed told me (viric) it's the patch to apply for mesa.
+I adapted his patch for mesa 7.5 to this 7.10
+
+diff --git a/src/mesa/drivers/dri/sis/sis_context.h b/src/mesa/drivers/dri/sis/sis_context.h
+index a82a659..d8d8d9a 100644
+--- a/src/mesa/drivers/dri/sis/sis_context.h
++++ b/src/mesa/drivers/dri/sis/sis_context.h
+@@ -404,6 +404,8 @@ struct sis_context
+ #define MMIO_WMB()	__asm __volatile("" : : : "memory")
+ #elif defined(__ia64__)
+ #define MMIO_WMB()	__asm __volatile("mf" : : : "memory")
++#elif defined(__mips__)
++#define MMIO_WMB()     __asm __volatile("" : : : "memory")
+ #else
+ #error platform needs WMB
+ #endif