Re: [Qemu-devel] [PATCH 6/7] Add -Wold-style-declaration -Wold-style-definition to QEMU_CFLAGS

[Blue Swirl <blauwirbel@gmail.com>]

On Wed, Sep 23, 2009 at 7:09 PM, Markus Armbruster <armbru@redhat.com> wrote:
> Laurent Desnogues <laurent.desnogues@gmail.com> writes:
>
>> On Wed, Sep 23, 2009 at 1:19 AM, Juan Quintela <quintela@redhat.com> wrote:
>>> ANSI c89 has been with us for a while.
>>>
>>> Signed-off-by: Juan Quintela <quintela@redhat.com>
>>> ---
>>>  configure |    1 +
>>>  1 files changed, 1 insertions(+), 0 deletions(-)
>>>
>>> diff --git a/configure b/configure
>>> index 62dccd2..81b9ba8 100755
>>> --- a/configure
>>> +++ b/configure
>>> @@ -1648,6 +1648,7 @@ if test "$debug" = "no" ; then
>>>  fi
>>>  QEMU_CFLAGS="-Wall -Wundef -Wendif-labels -Wwrite-strings -Wmissing-prototypes $QEMU_CFLAGS"
>>>  QEMU_CFLAGS="-Wstrict-prototypes -Wredundant-decls $QEMU_CFLAGS"
>>> +QEMU_CFLAGS="-Wold-style-declaration -Wold-style-definition $QEMU_CFLAGS"
>>
>> Some older versions of gcc don't handle -Wold-style-declaration.
>> For instance gcc 4.1.2.
>
> Pretty old, do we want to support it?  If yes, make configure detect
> whether the warning works?

Yes, OpenBSD uses 3.3.5 (propolice).

There are already similar checks for linker flags in configure, new
checks for warnings available would allow a different set of flags for
the latest and greatest GCC and the good old ones.