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Date: Tue, 16 Jun 2009 16:28:30 +0100
From: Jamie Lokier <jamie@shareable.org>
Subject: Re: [Qemu-devel] [PATCH] Fix SDL configuration for mingw32 cross
	compilation.
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To: Anthony Liguori <aliguori@us.ibm.com>
Cc: qemu-devel@nongnu.org

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