[FFmpeg-user] multiple definition of `_SDL_GetError'

[JonY]

On 9/11/2011 13:00, Kyle wrote:
> After working through this bug:
> https://ffmpeg.org/trac/ffmpeg/ticket/282 I ran into this:
> /home/kyle/software/ffmpeg/packages/sdl/sdl-1.2.14-win32/lib/libSDL.a(SDL_error.o):SDL_error.c:(.text+0x477):
> multiple definition of `_SDL_GetError'
> libavdevice/libavdevice.dll.a(d000060.o):(.text+0x0): first defined here
> /home/kyle/software/ffmpeg/packages/sdl/sdl-1.2.14-win32/lib/libSDL.a(SDL_thread.o):SDL_thread.c:(.text+0x2c1):
> multiple definition of `_SDL_CreateThread'
> libavdevice/libavdevice.dll.a(d000030.o):(.text+0x0): first defined here
> /home/kyle/software/ffmpeg/packages/sdl/sdl-1.2.14-win32/lib/libSDL.a(SDL_thread.o):SDL_thread.c:(.text+0x411):
> multiple definition of `_SDL_WaitThread'
> libavdevice/libavdevice.dll.a(d000168.o):(.text+0x0): first defined here

Hi,

This would be a symptom of not using dllexport properly (eg using
-export-all-symbols).

It is also possible that dllexport directives leaked into the SDL static
lib, and finally into libavdevice, caused by sloppy use of the dllexport
attribute and the use of static libs to build DLLs.

Anyway, libavdevice shouldn't be exporting SDL symbols.

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