Re: [RFT PATCH v3 3/9] add --with-sysroot

[Ralf Wildenhues]

* Paolo Bonzini wrote on Tue, Aug 03, 2010 at 10:04:08AM CEST:
> On 08/01/2010 12:48 PM, Ralf Wildenhues wrote:
> 
[ other packages that already use --with-sysroot ]

> >I'm not sure how to address these (not even sure
> >they use Libtool) except for a big sign in NEWS, and documentation in
> >the manual.
> 
> I can think of two ways:
> 
> 1) ignore --with-sysroot if not cross-compiling.  This however has a
> problem: if we test $cross_compiling = yes, sysroot tests will fail
> under Wine.

Yes, both that, and: I thought this patch series was meant to be usable
also for native compilation?

Distro packages much like to do things like that.

> 2) support both --with-sysroot and --with-host-sysroot, with the
> latter overriding the first.  Make GCC's toplevel always pass
> --without-host-sysroot to build modules, always pass
> --without-host-sysroot unless it was specified for host modules
> (this serves Canadian crosses), and skip --with-host-sysroot for
> target modules.  This is a hack, but one that can work reliably.

At this point you have me lost, simply because I can't claim to
understand all the details here.  So I can't give good advice.
My best bet would be to either trust you, or require some way to
set things up with GCC to try them out.  Doesn't have to be a
testsuite addition, just some recipe that works.


Also, I just noticed that recent GCC can just be passed --sysroot $D
and it will print $D upon --print-sysroot, so maybe if this is supported
it can be used for wider test exposure?  If you need GCC to support the
sysroot, that is.  And maybe symlink-tree will come in handy ... ?

Thanks,
Ralf