[FFmpeg-devel] Why 'You can only build one library type at once on MinGW'?

Michael Niedermayer michaelni
Sat May 12 02:58:33 CEST 2007


On Fri, May 11, 2007 at 04:36:36PM -0700, Trent Piepho wrote:
> On Sat, 12 May 2007, Michael Niedermayer wrote:
> >
> > and to get this totally off topic disscussion a little back to ffmpeg,
> > i wish i could get gcc to make all symbols which arent in a specific set
> > of headers "library-wide static" anyone knows a simple and clean trick
> > to do that?
> Ulrich Drepper has a great paper on how to write DSOs that goes into this:
> http://people.redhat.com/drepper/dsohowto.pdf

ive not read that and i wont, ive read enough from this guy to know that
id learn more by watching excel saga than by reading what he wrote ...

i still have nightmares from the totally broken PT_GNU_STACK mess ...

> The most obvious is just to make things static when you can and try to
> organize your code to make as much static as you can.
> gcc has a visibility attribute that you can assign to functions and globals to
> make them library-wide static or non-library wide static.  There is also the
> gcc -fvisibility option that changes the default.  So you can make the default
> hidden and override the symbols you want your library to export, or do it the
> other way around.

i want the ones in the public header to be vissible and the rest to be not
so i just hmm  hmmm ...... don tell me they didnt have an option for the
case 99.99% of the users of gcc would want but rather some odd feature which
requires to change the whole source?

Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Democracy is the form of government in which you can choose your dictator
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