[Ffmpeg-devel] OS/X - undefined symbols due to strip'd shared libs

[Joeri van Oostveen]

Being a big noob at this compiling stuff, how do I compile the ffmpeg
as a shared library?
I tried adding --enable-shared in the ./configure, make and make
install, but when I compile some other software (php) which needs the
ffmpeg, I keep getting this message:
checking for ffmpeg libavcodec.so... configure: error: ffmpeg share
libraries not found. Make sure you've built ffmpeg as shared libs
using the --enable-shared option

thanks in advance!
Joeri

On 10/21/05, Diego Biurrun <diego at biurrun.de> wrote:
> On Thu, Oct 20, 2005 at 10:16:33PM -0700, Steven M. Schultz wrote:
> >
> >       On OS/X the shared libs must be installed with "install -s" which
> >       strips all the global symbols.  Linking against a stripped library
> >       gives undefined symbols.
> >
> >       I noticed this when linking against libavutil.dylib where
> >       _ff_log2_tab is supposed to reside.  Looking at the symbol table
> >
> > sms% nm /usr/local/lib/libavutil.dylib
> >
> > /usr/local/lib/libavutil.dylib(single module):
> >          U _frexp
> >          U _ldexp
> >          U _log
> >
> >       "install -s" removed _everything_ except the 3 undefineds.
> >
> >       The attached patch for ./configure creates an 'installstrip' variable
> >       which can be overriden on a per OS basis.  The default is set to be
> >       "-s", then in the Darwin) section installstrip="" is done.  Later
> >       on "INSTALLSTRIP=$installstrip" is used.
> >
> >       After the patch 'nm /usr/local/lib/libavutil.dylib | grep ff_log2"
> >       yields:
> >
> > 00002d90 S _ff_log2_tab
> >
> >       Much better :)
>
> Thanks, applied.
>
> Diego
>
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