[Ffmpeg-devel] [PATCH] Cygwin vhook, always static avformat

Diego Biurrun diego
Thu Aug 3 18:45:28 CEST 2006

On Wed, Aug 02, 2006 at 03:45:42PM +0200, V?ctor Paesa wrote:
> The reason is that WIN32 does not allow undefined symbols during linking.
> These symbols might be defined by:
> a) Adding the av[ucf]* libraries as VHOOKLIBS (the
> ffmpeg.cygwin.vhook.6.patch way)
> b) Creating a .def for the _av_mallocz, _avpicture_get_size, etc. that
> exist in ffmpeg.exe (static build), then adding
> that .def to the linking steps in vhooks.
> c) Using __declspec(dllimport) (a.ka. FF_IMPORT_ATTR) somehow, somewhere
> in vhooks (shared libraries builds).
> I believe that (a) is the solution that minimizes changes and is more
> portable.

But it has the downsize of creating huge vhooks.  This is not
acceptable.  I'm confident that this is just a matter of finding the
right linker incantation ...


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