This patch keeps gcc-4.0.0-snapshot from segfaulting when building glibc with -O3 or
-finline-functions.
See:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19345
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/dwarf2out.c.diff?cvsroot=gcc&only_with_tag=gcc-4_0-rhl-branch&r1=1.570.4.2&r2=1.570.4.3

===================================================================
RCS file: /cvs/gcc/gcc/gcc/dwarf2out.c,v
retrieving revision 1.570.4.2
retrieving revision 1.570.4.3
diff -u -r1.570.4.2 -r1.570.4.3
--- gcc/gcc/dwarf2out.c	2005/03/09 00:33:56	1.570.4.2
+++ gcc/gcc/dwarf2out.c	2005/03/11 13:06:40	1.570.4.3
@@ -10497,8 +10497,12 @@
 
       if (TYPE_P (fn))
 	fn = TYPE_STUB_DECL (fn);
+      
+      /* TYPE_STUB_DECL may have given us a NULL, which decl_function_context
+	 won't like.  */
+      if (fn)	
+	fn = decl_function_context (fn);
 
-      fn = decl_function_context (fn);
       if (fn)
 	dwarf2out_abstract_function (fn);
     }