Re: [Qemu-devel] [PATCH] configure: improve multiarch support for pkgconfig

[John Snow]

On 04/10/2015 09:59 AM, Gerd Hoffmann wrote:
>    Hi,
>
> > 32-bit compilation on 64-bit hosts is broken because pkgconfig isn't
> > multi-arch aware and selects the 64-bit glibconfig.h header file.  That
> > file assumes the LP64 data model so guint64 is defined as unsigned long.
> > This does not work for 32-bit builds where sizeof(unsigned long) == 4
> > bytes.
>
> ... there are more effects, like stuff being enabled because 64bit devel
> lib is installed even when the 32bit devel lib isn't.
>
> IMO it is fine to expect users set PKG_CONFIG_LIBDIR accordingly in that
> case.  It would be very nice though to record this variable (in
> config.status maybe?) so it doesn't get lost in case make figures it
> should re-run configure because it was changed.

I'm not sure I follow you. What would be wrong with configure re-polling 
for the correct setting in that case?

Unless, perhaps, you are discussing the possibility of losing a user 
override from the first time they ran configure with PKG_CONFIG_LIBDIR 
already set to some custom value.

> cheers,
>    Gerd