Re: [PATCH] gnu: Add abbaye

["Thompson, David" <dthompson2@worcester.edu>]

On Fri, May 2, 2014 at 3:05 AM, Ludovic Courtès <ludo@gnu.org> wrote:
> "Thompson, David" <dthompson2@worcester.edu> skribis:
>
>> On Thu, May 1, 2014 at 12:27 PM, Ludovic Courtès <ludo@gnu.org> wrote:
>>> I noticed that ‘abbaye’ segfaults for me, immediately after opening its
>>> first window (splash screen?).
>>>
>>
>> That crash happens with the old version of the sdl-image package
>> because it can't use libpng to open images.  Did something go wrong
>> where the fixed sdl-image package isn't being used?
>
> Looking at the strace output, it does seem to relate to libpng:
>
> --8<---------------cut here---------------start------------->8---
> open("/gnu/store/hf5kklv837xbfcv6gc7gpsj36l69j3sj-glibc-2.19/lib/libpng15.so.15", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
> open("/gnu/store/6z7k9ms4sf367c3phl7djhb740ly3dqi-gcc-4.8.2/lib/libpng15.so.15", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
> open("/gnu/store/hf5kklv837xbfcv6gc7gpsj36l69j3sj-glibc-2.19/lib/libpng15.so.15", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
> close(6)                                = 0
> munmap(0x7f09053e2000, 4096)            = 0
> --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0x8} ---
> --8<---------------cut here---------------end--------------->8---
>
> And indeed, ‘abbaye’ is not explicitly linked against libpng, so it
> can’t find it.
>
> If I do:
>
> --8<---------------cut here---------------start------------->8---
> LD_LIBRARY_PATH=/gnu/store/naxqxdf7f6lfpy4h481h8j8hs2r44v09-libpng-1.5.17/lib /gnu/store/9gfzrsj71ph5pk2hxn7mmpsfflz0jpc7-abbaye-1.13/bin/abbaye
> --8<---------------cut here---------------end--------------->8---
>
> Then it works like a charm.
>
> I suppose we need to add -lpng on the link command line?
>

Thanks for investigating.  Abbaye doesn't directly use libpng,
SDL_image does, so I think that your copy of Abbaye is not using the
latest sdl-image package that propagates libpng (and others).  Did you
build abbaye yourself or use a substitute from hydra?  I noticed that
there have been some build failures of SDL libraries to another
dependency failing to build.
http://hydra.gnu.org/job/gnu/master/sdl-image-1.2.12.x86_64-linux

> BTW, the splash screen says “freeware”; would be great if we could
> change that to “free software”.
>

I noticed that and wanted to change it, too.  However, it's not as
simple as a quick substitute, since it's actually part of an image.
Perhaps we could simply use imagemagick to write over the text with
the background color.  WDYT?

> (Seeing this game makes me feel younger.  ;-))
>
> Thanks,
> Ludo’.

It's a simple little game with a very old-school feel, but it's fun,
very difficult, and the enhanced pixel art graphics are nice.  :)

- Dave