[Mesa-maintainers] Mesa master requires expat which ships with a .pc file

[Jonathan Gray]

On Tue, Aug 08, 2017 at 01:10:15PM +0100, Emil Velikov wrote:
> [Adding a couple of CentOS guys]
> 
> Hi all,
> 
> With the following Mesa commit [1] I dropped a workaround we had for
> 10+year old version of expat that lack a expat.pc file.
> The file was introduced with v 2.1 released 2012, which is available
> even in Debian oldoldstable.
> 
> Seems like I've missed the CentOS/RHEL 6 series which still uses 2.0 by default.
> 
> Which brings the questions:
> - Does your platform ship expat 2.1/expat.pc file?
> - How many distributions/people are affected?

OpenBSD-current includes expat 2.2.3 as part of the base system and
includes /usr/lib/pkgconfig/expat.pc.

Still need to find some time to get Mesa building without gnu make
again, but no concerns with this change as far as I can tell.

> 
> If it's more than the odd build-test bot, we could opt for Vinson's
> workaround [2].
> Alternatively can the affected platforms/setups use a local workaround?
> 
> Possible solutions include:
>  - create/cp/symlink a expat.pc file, and point PKG_CONFIG_PATH to it
>  - set EXPAT_CFLAGS and EXPAT_LIBS alongside/prior to calling configure
> 
> Please, let's not dwell into distributions' packaging decisions and
> focus on how many uses-cases we have.
> 
> Thanks
> Emil
> 
> [1] https://cgit.freedesktop.org/mesa/mesa/commit/?id=5c007203b73da88b9e76ce28027c6d27661e45b1
> [2] https://patchwork.freedesktop.org/patch/170551/
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