Re: Issue: TORCS won't link libpng on Ubuntu 13.10

Hi Tom

No, looks good, no idea...

Recap:
- The command line shows -lpng -> ok
- There is actually a png library -> ok
- The symbol is defined -> ok

So the last thing what comes to my mind is that something is broken 
(toochain, environment, libs, ...). Could you try to reinstall the png 
lib and png devel packages, and then try to reconfigure/rebuild torcs 
(make distclean, ./configure, make)?

Kind regards

Bernhard

On 12/04/2013 02:41 PM, Toms Lēšmanis wrote:
> Hi,
>
> 1. "nm /usr/lib/x86_64-linux-gnu/libpng.a | grep create_info_struct" on
> ./lib/x86_64-linux-gnu/libpng.a gives:
> 00000000000002e0 T png_create_info_struct
> So it's defined there.
>
> 2. locate libpng* gives:
> /lib/i386-linux-gnu/libpng12.so.0
> /lib/i386-linux-gnu/libpng12.so.0.49.0
> /lib/x86_64-linux-gnu/libpng12.so.0
> /lib/x86_64-linux-gnu/libpng12.so.0.49.0
> /usr/lib/x86_64-linux-gnu/libpng.a
> /usr/lib/x86_64-linux-gnu/libpng.so
> /usr/lib/x86_64-linux-gnu/libpng12.a
> /usr/lib/x86_64-linux-gnu/libpng12.so
> /usr/lib/x86_64-linux-gnu/libpng12.so.0
>
> the file command gives:
> /lib/x86_64-linux-gnu/libpng12.so.0: symbolic link to `libpng12.so.0.49.0'
> /lib/x86_64-linux-gnu/libpng12.so.0.49.0: ELF 64-bit LSB shared object,
> x86-64, version 1 (SYSV), dynamically linked,
> BuildID[sha1]=0x01b6604fb7db9154179ae8f67378fe56b0791a3f, stripped
> /usr/lib/x86_64-linux-gnu/libpng.so: symbolic link to `libpng12.so'
> /usr/lib/x86_64-linux-gnu/libpng12.so: symbolic link to `libpng12.so.0'
> /usr/lib/x86_64-linux-gnu/libpng12.so.0: symbolic link to
> `/lib/x86_64-linux-gnu/libpng12.so.0'
>
> So it all comes down to this one file
> /lib/x86_64-linux-gnu/libpng12.so.0.49.0
> And all the files have the "png_create_info_struct"
>
> Does this give you anything?
>
> Thanks,
> Reinis
>
>
> Quoting *Bernhard Wymann <[email protected]> <mailto:[email protected]>* :
>
>     Hi Tom
>
>     This looks good:
>
>      > When I do "nm -D ./lib/x86_64-linux-gnu/libpng12.so | grep
>      > create_info_struct", I get:
>      > 0000000000003e80 T png_create_info_struct
>      > So it's defined there.
>
>      >
>     COMPILER_PATH=/usr/lib/gcc/x86_64-linux-gnu/4.8/:/usr/lib/gcc/x86_64-linux-gnu/4.8/:/usr/lib/gcc/x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/4.8/:/usr/lib/gcc/x86_64-linux-gnu/
>      >
>     LIBRARY_PATH=/usr/lib/gcc/x86_64-linux-gnu/4.8/:/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../lib/:/lib/x86_64-linux-gnu/:/lib/../lib/:/usr/lib/x86_64-linux-gnu/:/usr/lib/../lib/:/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../:/lib/:/usr/lib/
>
>     But this is suspect:
>     1.
>     ./lib/x86_64-linux-gnu/libpng.a
>     I do not have this on my system, what does nm on this file say (without
>     the "-D" option this time, because it is a static library), maybe it
>     tries to link with the static version (your output does not indicate
>     this, but check it anyway).
>
>      > P.S. when I do "ldd png_test" [my sample program], I get the
>     following:
>      > linux-vdso.so.1 => (0x00007fff2bbc0000)
>      > libpng12.so.0 => /lib/x86_64-linux-gnu/libpng12.so.0
>      > (0x00007f651a44f000)
>      > libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f651a087000)
>      > libz.so.1 => /usr/local/lib/libz.so.1 (0x00007f6519e6a000)
>      > libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f6519b66000)
>      > /lib64/ld-linux-x86-64.so.2 (0x00007f651a68e000)
>
>     2. The libpng here seems to be in /lib/..., where the former one was in
>     /usr/lib, could you check if this is the same file (symbolic/hard link?)
>     Does the file in lib has the symbol as well (check this as well with
>     nm)? Which packages do these files belong to, are these in the same one?
>
>     Kind regards
>
>     Bernhard
>
>


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