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Re: [Qemu-devel] [PATCH v2 1/2] coroutine-ucontext: Help valgrind unders

From: Eric Blake
Subject: Re: [Qemu-devel] [PATCH v2 1/2] coroutine-ucontext: Help valgrind understand coroutines
Date: Fri, 13 Jul 2012 10:13:08 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:13.0) Gecko/20120615 Thunderbird/13.0.1

On 07/13/2012 10:06 AM, Kevin Wolf wrote:
> Am 13.07.2012 17:37, schrieb Peter Maydell:
>> On 13 July 2012 16:31, Kevin Wolf <address@hidden> wrote:
>>> +/* Work around an unused variable in the valgrind.h macro... */
>>> +#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
>>> +static inline void valgrind_stack_deregister(CoroutineUContext *co)
>>> +{
>>> +    VALGRIND_STACK_DEREGISTER(co->valgrind_stack_id);
>>> +}
>>> +#pragma GCC diagnostic error "-Wunused-but-set-variable"
>>> +#endif
>> '#pragma .. error' will defeat the configure code which makes warnings
>> not fatal in release builds.
> I know. What's your suggestion? Switch only to warning? Then it would be
> easy to miss warnings. Disabling the valgrind code for gcc < 4.6 is
> better, but still not really nice.

But you're already disabling the valgrind code for gcc too old to honor

#pragma GCC diagnostic ignored "-Wunused-but-set-variable"

so what's the difference in making your configure check for
CONFIG_VALGRIND_H _also_ check that gcc is new enough to honor push/pop
of diagnostic?

Eric Blake   address@hidden    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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