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From: Anthony Liguori <aliguori@us.ibm.com>
In-Reply-To: <CAFEAcA_9Vra0HGG5BjV4EKkvxwGLLaYUOyj1pTLkYwoJqs+5EA@mail.gmail.com>
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Date: Fri, 27 Jul 2012 09:27:10 -0500
Message-ID: <87hastmg8x.fsf@codemonkey.ws>
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Subject: Re: [Qemu-devel] [PATCH 4/7] compiler: add macro for GCC weak
	symbols
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To: Peter Maydell <peter.maydell@linaro.org>
Cc: libvir-list@redhat.com, Markus Armbruster <armbru@redhat.com>, Eric Blake <eblake@redhat.com>, qemu-devel@nongnu.org, Alexander Graf <agraf@suse.de>

Peter Maydell <peter.maydell@linaro.org> writes:

> On 27 July 2012 14:37, Anthony Liguori <aliguori@us.ibm.com> wrote:
>> --- a/compiler.h
>> +++ b/compiler.h
>> @@ -45,6 +45,7 @@
>>  #  define GCC_ATTR __attribute__((__unused__, format(gnu_printf, 1, 2)))
>>  #  define GCC_FMT_ATTR(n, m) __attribute__((format(gnu_printf, n, m)))
>>  # endif
>> +#define GCC_WEAK __attribute__((weak))
>>  #else
>>  #define GCC_ATTR /**/
>>  #define GCC_FMT_ATTR(n, m)
>
> The GCC manual says "Weak symbols are supported for ELF targets,
> and also for a.out targets when using the GNU assembler and linker".
> Have you tested this on Windows and MacOSX ?

Weak symbols are supposed to be supported by mingw32.

I have no idea about MacOS X.

I have no way to develop or test for MacOS X using free software so I
honestly don't care about it.

Regards,

Anthony Liguori

>
> (Also, no version of the macro in the not-GCC branch of the #if.)
>
> -- PMM