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Re: Need help porting eDuke32

From: Marius Bakke
Subject: Re: Need help porting eDuke32
Date: Sat, 16 Feb 2019 17:45:15 +0100
User-agent: Notmuch/0.28.1 ( Emacs/26.1 (x86_64-pc-linux-gnu)


HiPhish <address@hidden> writes:

> Then it fails at this step:
>     In file included from source/build/include/mutex.h:10:0,
>                      from source/build/include/osd.h:12,
>                      from source/build/include/baselayer.h:11,
>                      from source/duke3d/src/duke3d.h:28,
>                      from source/duke3d/src/sdlmusic.cpp:35:
>     source/build/include/sdl_inc.h:63:25: fatal error: SDL_mixer.h: No such 
> file or directory
>     compilation terminated.
>     Failed building obj/duke3d/sdlmusic.o from source/duke3d/src/sdlmusic.cpp!
>     make: *** [GNUmakefile:982: obj/duke3d/sdlmusic.o] Error 1
> Looking into the offending file shows the following code:
>     #if defined NEED_SDL_MIXER
>     # if defined SDL_USEFOLDER
>     #  if SDL_TARGET == 2
>     #   include <SDL2/SDL_mixer.h>
>     #  else
>     #   include <SDL/SDL_mixer.h>
>     #  endif
>     # else
>     #  include "SDL_mixer.h"
>     # endif
> The second-to-last line is line 63; the compiler looks for the header file in 
> the same directory as the source file, which is obviously wrong. So it seems 
> like my environment specification did not set up SDL properly. Can someone 
> who 
> has experience with SDL please help me out to understand what is going wrong 
> here?

The 'include' keyword makes the compiler look for header files in
$C_INCLUDE_PATH and a few other locations.  The Guix daemon will populate
that variable with all inputs that have an "include" directory.  Running
`guix build sdl2-mixer` shows that it has ".../include/SDL2/SDL_mixer.h".

What's needed here is to make sure SDL_USEFOLDER is set such that it
searches for <SDL2/SDL_mixer.h> as on line 58.  Alternatively, you could
substitute the code on line 63 to read 'include "SDL2/SDL_mixer.h"' as a
probably dirty workaround.


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