[Ffmpeg-devel] [PATCH] Networking with MingW

[Michael A. Kohn]

On Mon, 6 Nov 2006, V?ctor Paesa wrote:

> Hi,
>>
>> On Mon, 6 Nov 2006, Alex Beregszaszi wrote:
>>
>>> Hi,
>>>
>>>> I also made a quick #define change in gxf.c so MingW can build a
>>>> shared DLL.  I was getting errors during linking without this change.
>>>>
>>>> I really hope someone accepts this patch.  I'm trying to convince the
>>>> company I work for to move to Linux or at least cross-platform and
>>>> this is the best library (in my opinion) for doing the graphics that
>>>> we would need.
>>>
>>> static AVRational fps_tag2avr(int32_t fps) {
>>> +#ifndef __MINGW32__
>>>     extern const AVRational ff_frame_rate_tab[];
>>> +#else
>>> +    extern __declspec(dllimport) const AVRational ff_frame_rate_tab[];
>>> +#endif
>>>     if (fps < 1 || fps > 9) fps = 9;
>>>     return ff_frame_rate_tab[9 - fps]; // values have opposite order
>>> }
>>>
>>> What the hell is that?
>>
>> Good question.  The linker gave an error about "auto-import" and reading
>> the man page for ld it said that would fix it.  I believe it's forcing
>> that symbol to be exported or imported for some reason, no sure why.  Yes
>> it's disgusting, but a lot of Windows programming is.
>>
>
> If I recall correctly, this is a bug in binutils.
> If you use binutils-2.15.91-20040904-1 upgrade or downgrade them.

I was using GNU ld version 2.15.90.0.2... but I suppose the bug could be 
in here too..  that code is simple to fix by hand anyway so it's not so 
important to me..  I'll remove it from the patch..