From: Wim Vander Schelden <wim.vanderschelden@...>
Date: 2006-12-29T18:13:33+09:00
Subject: Re: Ruby extension issue

Eric Hodel wrote:
> On Dec 28, 2006, at 14:39, Wim Vander Schelden wrote:
>> Eric Hodel wrote:
>>> On Dec 28, 2006, at 13:45, Wim Vander Schelden wrote:
>>>
>>>> I was able to fix the problem by changing my extconf.rb to:
>>>>
>>>> However, I don't know *WHY* it works. The pkg_config seems to be 
>>>> the crucial line.
>>>> I just went through other people's extconf.rb files and guessed the 
>>>> "sdl" value.
>>>> Any help would be appreciated, since there seems to be no 
>>>> documentation about
>>>> pkg_config...
>>>
>>> $ ruby extconf.rb
>>> checking for SDL_Init() in -lSDL... no
>>> checking for SDL/SDL.h... no
>>> creating Makefile
>>> $
>>>
>>> You should never call create_makefile makefile when required 
>>> libraries and headers can't be found.
>>
>> Ok thanks :) Could you also explain what these methods do exactly?
>
>>    require 'mkmf'
>>
>>    dir_config('gamer')
>
> dunno
>
>>    have_library("SDL", "SDL_Init")
>
> Do we have an SDL_Init() declared in libSDL.so (platform dependent)?  
> Returns true or false if it was found or not.   Check the return value 
> and abort if false and you need this library.
>
>>    have_header("SDL/SDL.h")
>
> Do we have an SDL/SDL.h file lying around somewhere?  Returns true or 
> false if it was found or not.  Check the return value and abort if 
> false and you need this library.
>
>>    pkg_config("sdl")
>
> dunno
>
>>    create_makefile('gamer')
>
> creates a Makefile that will build gamer.so
>
> --Eric Hodel - drbrain@segment7.net - http://blog.segment7.net
>
> I LIT YOUR GEM ON FIRE!
>
>
>
Thank you, but my main problem is the pkg_config :-(
Well for now I'll just be happy that it works :-)

Wim

-- 
Wim Vander Schelden
Bachelor Computer Science, University Ghent

http://nanoblog.ath.cx
My weblog, powered by Ruby and BSD licensed.