Added the undofile() function. Updated runtime files.

runtime/compiler/gcc.vim

@@ -1,7 +1,7 @@
 " Vim compiler file
 " Compiler:         GNU C Compiler
 " Maintainer:       Nikolai Weibull <now@bitwi.se>
-" Latest Revision:  2009-05-01
+" Latest Revision:  2010-05-30
 
 if exists("current_compiler")
   finish
@@ -18,7 +18,11 @@ CompilerSet errorformat=
       \\"%f\"%*\\D%l:\ %m,
       \%-G%f:%l:\ %trror:\ (Each\ undeclared\ identifier\ is\ reported\ only\ once,
       \%-G%f:%l:\ %trror:\ for\ each\ function\ it\ appears\ in.),
+      \%f:%l:%c:\ %terror:\ %m,
+      \%f:%l:%c:\ %tarning:\ %m,
       \%f:%l:%c:\ %m,
+      \%f:%l:\ %terror:\ %m,
+      \%f:%l:\ %tarning:\ %m,
       \%f:%l:\ %m,
       \\"%f\"\\,\ line\ %l%*\\D%c%*[^\ ]\ %m,
       \%D%*\\a[%*\\d]:\ Entering\ directory\ `%f',