[PATCH] build: fix libarchive detection

[David Disseldorp]

On Fri, 29 May 2015 10:26:55 +0200, Björn Jacke wrote:

> On 2015-05-29 at 09:15 +1200 Andrew Bartlett sent off:
> > On Thu, 2015-05-28 at 16:52 +0200, Björn Jacke wrote:
> > > our libarchive detection was solidly broken, we also don't rely on pkgconfig now.
> > 
> > What was wrong with relying on pkg-config?  We really should be using
> > that as much as possible.
> 
> basically I agree that pkg-config should be preferred if available. The
> non-pkg-config check should also worth though in any case. And as I've written
> in the bug report later on also, the check function that was used was wrong -
> conf.CHECK_BUNDLED_SYSTEM works only for our bundeled libraries.

CHECK_BUNDLED_SYSTEM works for both bundled and system libraries. If you
really want to avoid the bundled check behavior then we could go with
the attached patch, but I still wouldn't really call it a bug fix.

> > I would much rather we fix whatever was wrong with using pkg-config, or
> > at least use that and recover if we really know there is a broken
> > libarchive that:
> >  - we still want to use
> >  - but has a broken pkg-config
> 
> see comment 4 in the bug report. I would apreciate if you can enhance the waf
> build system to make proper pkg-config checks for generic libraries including
> falback for non-pkg-config checks and the function check feature of
> CHECK_FUNCS_IN we can then change the checks of this and actually all the other
> external library checks that to such a function. Currently this is wrong and a
> limitation of waf obviously. I'll change the comment as sugested by David.

I don't see why we need the function check fallback for libarchive. The
library provides a perfectly usable pkg-config file.

Cheers, David
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