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From: "joseph at codesourcery dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug driver/46802] GCC option handling change breaks dejagnu
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46802

--- Comment #1 from joseph at codesourcery dot com <joseph at codesourcery dot com> 2010-12-04 18:44:51 UTC ---
On Sat, 4 Dec 2010, hjl.tools at gmail dot com wrote:

> g++: warning: switch '-fvtable-gc' is no longer supported
> g++: warning: switch '-fvtable-gc' is no longer supported

This is unrelated to the DejaGnu code you quote.

> prune_warnings in dejagnu has
> 
>     regsub -all "(^|\n)(cc1: warning: -g is only supported when using GAS on
> this processor\[^\n\]*\ncc1: warning:\[^\n\]*\n?)+" $text "\\1" text
>     regsub -all "(^|\n)(cc1plus: warning: -g is only supported when using GAS
> on this processor\[^\n\]*\ncc1plus: warning:\[^\n\]*\n?)+" $text "\\1" text

None of this DejaGnu code appears to do anything with -fvtable-gc 
diagnostics, unless there was a previous warning about -g that you didn't 
quote.  The ld testsuite tries to skip these tests case on the compiler 
version number - is that broken?

In any case, it's clearly better for warnings to start "g++:" instead of 
"cc1plus:".  The cc1plus binary is an internal implementation detail; 
diagnostics should refer to the user-visible binary, which is g++ here.