Please consider this patch.
It adds recognition of one line gcc note of undeclared identifier to
'errorformat'.
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*** /usr/share/vim/vim73/compiler/gcc.vim 2012-06-07 04:42:38.000000000 +0400
--- /home/shiny/.vim/compiler/gcc.vim 2012-06-20 18:30:57.298165106 +0400
***************
*** 16,21 ****
--- 16,23 ----
\%*[^\"]\"%f\"%*\\D%l:\ %m,
\\"%f\"%*\\D%l:%c:\ %m,
\\"%f\"%*\\D%l:\ %m,
+ \%-G%f:%l:%c:\ note:\ each\ undeclared\ identifier\ is\ reported\ only\ once
+ \\ for\ each\ function\ it\ appears\ in,
\%-G%f:%l:\ %trror:\ (Each\ undeclared\ identifier\ is\ reported\ only\ once,
\%-G%f:%l:\ %trror:\ for\ each\ function\ it\ appears\ in.),
\%f:%l:%c:\ %trror:\ %m,
