[FFmpeg-devel] dependency problems

[Diego Biurrun]

On Sun, Dec 14, 2008 at 02:44:53PM +0100, Luca wrote:
> 
> On Sun, 2008-12-14 at 13:35 +0100, Diego Biurrun wrote:
> [...]
> > > Or is building from libav* subdirectories unsupported?
> > 
> > Is this really such a problem?  You can always just run
> > 
> > make libavformat/libavformat.a
> > 
> > or similar to skip building all libs and binaries...
> 
> I am not saying that this is a problem, but I did not know that building
> from a subdir is unsupported, and I think this is not documented.
> 
> I apologise if I am missing some documentation, but I think that this
> silent failure without any notice is is the problem: I was going to
> commit a broken patch because of this (I entered libavformat, I modified
> rtp.h and some .c files, I did "make" and I saw no failure, and I was
> going to do "svn commit"... But I forgot to modify a .c file, and my
> patch was broken. Fortunately, for some reason I ran "make" from the
> main directory and I noticed the problem). 

To be honest, you should not just run make in the subdirectory.  It's a
trained reflex people got from recursive make implementations IMO.  You
should run make from the root, some linking problems will only show up
when you link together binaries ...

Diego