Re: gEDA: Problems compiling gerbv: -lz, -lm

[Karel Kulhavý <clock@twibright.com>]

On Fri, Aug 20, 2004 at 11:43:26PM +0200, Stefan Petersen wrote:
> On Sat, 21 Aug 2004, Hamish Moffatt wrote:
> 
> > On Fri, Aug 20, 2004 at 08:23:45AM +0000, Karel Kulhavý wrote:
> > > I got numerous problems with missing -lz, -lm in addition to -lpng during compilation
> > > of gerbv-0.16
> >
> > > configure:3716: gcc -o conftest -O2 -march=athlon-xp -fomit-frame-pointer -fstrength-reduce -fschedule-insns -I/home/clock/usr/include   conftest.c -lpng   >&5
> > > /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.2.3/../../../libpng.so: undefined reference to `deflate'
> >
> > That means your libpng is built wrong. It should link against libz
> > itself if it needs it, rather then depending on user applications to
> > provide that link.

Can you point to a section of libpng specification saying that the user program
may rely on the fact that -lm and -lz will be linked by libpng itself?

Have you written the program according to the libpng interface specification?

Cl<

> 
> Hamish is right. On my machine I get from "ldd /usr/lib/libpng.so"
>         libz.so.1 => /usr/lib/libz.so.1 (0x40032000)
>         libm.so.6 => /lib/libm.so.6 (0x40043000)
>         libc.so.6 => /lib/libc.so.6 (0x40065000)
>         /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x80000000)
> 
> 
> 
> > You only changed configure. You would need to change the makefiles also.
> 
> Do the changes in configure.in. Then rerun aclocal, autoheader, autconf,
> automake --copy --add-missing (in that order). Then rerun ./configure et
> al.
> 
> -OR-
> 
> you could run
> 	./configure --disable-exportpng
> 
> if you don't need png export functionality.
> 
> 
> > > I think the ./configure and make mechanism of gerbv must be broken somehow.
> >
> > No, your libpng is broken.
> 
> I agree with Hamish.
> 
> Regards,
> /Stefan