Re: LTO vs LD_PRELOAD (libvirt FTBFS test suite failure)

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On Tue, Aug 04, 2020 at 12:02:05PM +0200, Florian Weimer wrote:
> * Daniel P. Berrangé:
> 
> > Taken from https://koji.fedoraproject.org/koji/taskinfo?taskID=48525923
> 
> Sorry, what would be more interesting is the linker invocation.  The
> build log does not show this, only the libtool invocation.  We don't
> really know what kind of transformations libtool does in this case.

Upstream libvirt has just yesterday replaced use of autotools with
meson. I just tried a Fedora rawhide build of our new meson based
code and it succeeded with LTO.

Given this, I think I'm fine just disabling LTO in rawhide for the
current libvirt release, with the expectation we'll re-enable LTO
in ~1 month time when we import the meson based release of libvirt.

IOW lets not waste any more time debugging this LTO / LD_PRELOAD
problem with libvirt.

> libtool is really not built for LTO, and it really should not be used on
> GNU systems.  But I understand that this is not uncontroversial.

There's oooh so many problems with libtool we've hit over the years,
especially with it re-arranging order of compiler/linker flags, and
so I'm beyond ecstatic that we've finally thrown it away for libvirt
in favour of meson.

There may have been a time & place for libtool and autotools in
general, but that time has passed....

Regards,
Daniel
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