Bug#827173: gcc-6: missing "Debian" in "gcc-6 --version" output

[Vincent Lefevre <vincent@vinc17.net>]

On 2016-06-13 14:43:06 +0200, Matthias Klose wrote:
> from the logs:
> 
> > Configured with: -v
> > 	 --with-pkgversion=' 6.1.1-6'
> 
> Don't know what happened. A new build has the distro name again.

I can see in the debian/rules2 file of 6.1.1-6:

CONFARGS = -v \
        --with-pkgversion='$(distribution)$(if $(with_linaro_branch),/Linaro)$(if $(with_ibm_branch),/IBM)___$(DEB_VERSION)' \
        --with-bugurl='file:///usr/share/doc/$(subst gcj,gcc,$(PKGSOURCE))/README.Bugs'

So, I suppose that the cause was that $(distribution) was unset.
If I understand correctly, this comes from debian/rules.defs,
which has:

distribution    := $(shell lsb_release -is)

In the logs[*], I can see multiple errors:

Traceback (most recent call last):
  File "/usr/bin/lsb_release", line 25, in <module>
    import lsb_release
ImportError: No module named 'lsb_release'

Shouldn't the build tools check for errors?

[*] https://buildd.debian.org/status/fetch.php?pkg=gcc-6&arch=amd64&ver=6.1.1-6&stamp=1465527737

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Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
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