Re: [Qemu-devel] [PATCH] configure: Disable (clang) initializer-overrides warnings

[Peter Maydell <peter.maydell@linaro.org>]

On 27 October 2012 22:24, Stefan Weil <sw@weilnetz.de> wrote:
> Am 27.10.2012 22:32, schrieb Igor Mitsyanko:
>> I encountered strange behavior of latest mingw gcc, it ignores
>> unrecognized -Wno-wombat options only in case if no other warnings are
>> issued (configure gccflags test doesn't issue any), otherwise I get this:
>>
>> cc1.exe: warning: unrecognized command line option
>> "-Wno-initializer-overrides" [enabled by default]
>>
>> This is probably a bug in mingw GCC (or perhaps I'm using it wrong), but
>> anyway, this makes QEMU mingw build output very noisy.

> This "feature" of gcc is not restricted to MinGW nor to a special version of
> gcc but can also occur on Linux.

Incidentally, I was tangentially involved in getting gcc to adopt
this behaviour. The rationale is that it allows you to write
straightforward makefiles which use -Werror and also some -Wno-*
options without having to add some configure-like step to test
whether gcc supports the -Wno-*. If the gcc version you're using
doesn't support detecting the presence of wombats in your source
code then it will never produce warnings about them, so it's
safe for it to treat -Wno-wombat as a no-op. The reason for
printing the message if some other warning is also emitted is
so the user can spot the case where they accidentally typo'd
the -Wno-* option they meant to use to suppress the warning.

-- PMM