[Ffmpeg-devel] [PATCH] Fix --enable-shared on Darwin

[Dan Villiom Podlaski Christiansen]

Hi,

The attached patch fixes --enable-shared so that it builds proper Mach-O 
dynamic libraries on Darwin & Mac OS X. The vhooks directory was changed 
to build Mach-O bundles; it seems their semantics are closer to what is 
expected.

Also included is support for passing a DESTDIR to 'make install', which 
might be useful for open source package managers, such as OpenDarwin and 
Fink, and removal of -bind_at_load to not defer linker errors until runtime.

I haven't tested it beyond ensuring that 'ffmpeg' and 'ffmpeg -formats' 
do not cause runtime linker errors - which they do if the binary isn't 
stripped just the right way :)

There are a few caveats to dynamic libraries on Darwin:

Darwin hard codes all library paths into dependent binaries. As a 
result, libavcodec, libavformat, etc. must reside in the configured 
prefix, and are not relocatable. This means that a dynamic ffmpeg cannot 
be run prior to installation without additional hackery.

I had to edit libavcodec/msmpeg4.c to initialize the three exported 
variables. Otherwise they will cause a linker error: "ld: common symbols 
not allowed with MH_DYLIB output format with the -multi_module option"

Other than that, the changes should be fairly straightforward.

- Dan Christiansen

P.S. Please Cc any replies directly to me, as I am not subscribed to 
this list. Thank you.
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