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Date: Tue, 16 Jun 2009 18:31:53 +0200
From: Stefan Weil <weil@mail.berlios.de>
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Subject: Re: [Qemu-devel] [PATCH] Fix SDL configuration for mingw32 cross
	compilation.
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To: Jamie Lokier <jamie@shareable.org>
Cc: QEMU Developers <qemu-devel@nongnu.org>

Jamie Lokier schrieb:
> Anthony Liguori wrote:
>   
>> Stefan Weil wrote:
>>     
>>> Anthony Liguori schrieb:
>>>  
>>>       
>>>> Stefan Weil wrote:
>>>>    
>>>>         
>>>>> When building QEMU for win32 on linux with mingw32,
>>>>> configure must call ${cross_prefix}-sdl-config (not
>>>>> sdl-config) to get the correct include and lib paths.
>>>>>
>>>>> The results of the native sdl-config are only valid
>>>>> for native builds. They are useless for cross builds.
>>>>>  
>>>>>      
>>>>>           
>>>> No, when you cross compile sdl, you still end up with an sdl-config
>>>> binary.  The solution is to install the binary to a different path and
>>>> use PATH when building.
>>>>
>>>> Where did you get your cross build of SDL from?  I assume whoever
>>>> packaged it renamed the binary but it's not what sdl actually does.
>>>>
>>>>    
>>>>         
>>> The PATH solution works (I used it, too), but it is bad:
>>> you have to use a modified PATH for every cross build
>>> (make calls configure when the configure script is updated).
>>>  
>>>       
>> Yes, this annoys me too.  One thing I thought about is that we could 
>> record important environment variables for use when re-running make.
>> It's not just PATH.  PKG_CONFIG_PATH is also important for running 
>> configure.  To properly cross compile, you need to set both.
>>     
>
> You can record PATH and other environment variables picked up at
> configure time in the Makefile itself.  Makefile.in:
>
>    export PATH = @PATH@
>
> It's not pretty, but it works.
>
> -- Jamie
>
>   

Only with autoconf / automake? QEMU does not use them,
so there is no Makefile.in.

I'd prefer setting paths for pkg-config and sdl-config via
configure options (those are recorded in config-host.mak).

Stefan