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Re: [libvirt] gnulib tests in libvirt broken by newer glibc 2.26

From: Christian Ehrhardt
Subject: Re: [libvirt] gnulib tests in libvirt broken by newer glibc 2.26
Date: Fri, 29 Sep 2017 14:02:20 +0200

On Fri, Sep 29, 2017 at 10:45 AM, Daniel P. Berrange <address@hidden> wrote:
On Thu, Sep 28, 2017 at 04:41:37PM -0700, Paul Eggert wrote:
> That patch essentially negates the point of the test, which is that getopt
> should be visible from unistd.h. I'd rather fix the problem than nuke the
> test.
> Could you explain what the Gnulib problem is here? I can't really see it in
> your email. A self-contained example would help.
> For what it's worth, I could not reproduce the problem on Fedora 26 by doing
> this in Gnulib (this tells 'configure' to use Gnulib-supplied getopt.h and
> getopt.c):

Fedora 26 only has glibc 2.25 - you need to have Fedora rawhide to get
the broken behaviour, as that has glibc 2.26.90

> ./gnulib-tool --create-testdir --dir foo getopt-posix
> cd foo
> ./configure gl_cv_func_getopt_posix=no ac_cv_header_getopt_h=no
> make
> make check

As Daniel said at least glibc 2.26 as in Fedora rawhide or Ubuntu Artful.
But thanks for these commands that way I could reproduce without needing any of the libvirt build env.

Here [1] a log of your commands on such a system showing the issue.
I added a gdb to show the assert and an LD_DEBUG so you can see that getopt is not taken from gnulib as the test assumes when verifying behavior.

[1]: http://paste.ubuntu.com/25638847/

Christian Ehrhardt
Software Engineer, Ubuntu Server
Canonical Ltd

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