djbfft in pkg-multimedia SVN, new revision of a52dec

[Fabian Greffrath]

Hi all,

I'd like to bring this topic back to your attention.

My plan is to package the djbfft library and link a52dec against it to 
get rid of #441693. djbfft is an extremely fast library for 
floating-point convulsion that is a soft dependency for a52dec and 
will speed up the decoding process (at least I hope so!).

I have decided to build only a normal and a PIC static djbfft library 
and to do without a shared library. The reasons for this are that (1) 
upstream does only build a static library and that (2) the library is 
optimized for speed and this benefit may get lost if linked dynamically.

Now I've got a question regarding how to link liba52 against the 
djbfft library. I know that for a shared library to link against a 
static one I have to link against the PIC version of the static one, 
i.e. -ldjbfft_pic. This is not necessary for the static version of 
liba52, but what if I do also link the static liba52 against the PIC 
static libdjbfft_pic? Is there any possible harm in this? Should I 
consider both cases in the Makefiles, i.e. if building the static 
liba52 do -ldjbfft but if building the shared liba52 do -ldjbfft_pic? 
How about the utilities in the a52dec package, should they be linked 
against the PIC or the normal libdjbfft?

Please enlighten me!

Cheers,
Fabian

-- 
Dipl.-Phys. Fabian Greffrath

Ruhr-Universität Bochum
Lehrstuhl für Energieanlagen und Energieprozesstechnik (LEAT)
Universitätsstr. 150, IB 3/134
D-44780 Bochum

Telefon: +49 (0)234 / 32-26334
Fax:     +49 (0)234 / 32-14227
E-Mail:  greffrath at leat.ruhr-uni-bochum.de