Re: __wine_uuidof causing a wall of "warning: returning reference to temporary" on g++

[Jacek Caban]

On 07/30/12 13:13, Ilya Konstantinov wrote:
> On Sun, Jul 29, 2012 at 9:47 PM, Jacek Caban <[e-mail]
> > wrote:
>     Upon first attempts to compile, I've received a wall of
>     "warning: returning reference to temporary" on Wine's headers
>     from g++.
>     All of those seem to stem from guidgen.h definition of
>     __wine_uuidof / __CRT_UUID_DECL for C++.
>
>
>
> I don't see these warnings here. Also Wine has the same code for
> __uuidof as mingw-w64, which is much more widely used with g++
> (Wine is mostly tested on C), and I never heard about such
> problem. Do you have any idea about what could be different in
> your setup? What's your g++ version?
>
>
> I'm using gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) to build my
> Winelib app.
>
> As to the difference from mingw-w64, I see different code in there:
> http://mingw-w64.svn.sourceforge.net/viewvc/mingw-w64?view=revision&revi...
> http://mingw-w64.svn.sourceforge.net/viewvc/mingw-w64?view=revision&revision=4279
> The idea is that if matches closer to the meaning of __uuidof,
> which should return a reference to constant IID structure.
>
>
> Understood.
> I'd expect compiler to be smart enough to produce same code
> without the reference anyway (after all it's an inline function),
> but still being more explicit would be nice. Could you please test
> if the attached patch fixes the problem for you?
>
>
> Yep, it does.

I've tested it more and sent a patch.

Jacek