Re: [Qemu-devel] [PATCH v2] configure: sanity check the glib library that pkg-config finds

["Daniel P. Berrange" <berrange@redhat.com>]

On Fri, Nov 13, 2015 at 01:01:52PM +0000, Peter Maydell wrote:
> On 13 November 2015 at 11:31, Daniel P. Berrange <berrange@redhat.com> wrote:
> > Developers on 64-bit machines will often try to perform a
> > 32-bit build of QEMU by running
> >
> >   ./configure --extra-cflags="-m32"
> >
> > Unfortunately if PKG_CONFIG_LIBDIR is not set to point to
> > the location of the 32-bit pkg-config files, then configure
> > will silently pick up the 64-bit pkg-config files and still
> > succeed.
> 
> Will this also handle all the other -config programs that
> seem to have sprouted up? Looking in configure we also call
>  sdl-config
>  sdl2-config
>  libgcrypt-config
>  aalib-config
>  curl-config

For custom non-pkg-config programs there's not any good general
purpose solution for them to look for 32-bit versions while on
64-bit hosts, at least not when 32-bit and 64-bit are both
installed into the same /usr prefix. If the 32-bit stuff is
installed in a completely separate root prefix, then you can
sometimes update $PATH to ensure the right -config binary is
found. This is a good reason why libs are encouraged to switch
to using pkg-config instead of home-grown alternatives

Regards,
Daniel
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