Bug#786518: Latest dpkg-dev breaks debdiff in some locales

[David Prévot]

Package: dpkg-dev,devscripts
Version: dpkg-dev/1.18.0
Version: devscripts/2.15.4
User: devscripts at packages.debian.org
Usertags: debdiff
Severity: normal

Hi,

Since dpkg-dev has been upgraded to 1.18.0, debdiff always fails to
display an actual wdiff between the control files in my locale
(LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8):

	$ debdiff mozilla-noscript_2.6.9.23~rc{2,3}-1_amd64.changes
	File lists identical (after any substitutions)
	debdiff: erreur: wdiff -n /tmp/IkoyCRMfRz/control /tmp/dTNFZ__x58/control a produit une erreur de sortie de type 1
	
	wdiff failed

On the other hand, forcing LC_ALL=C allows to workaround the issue:

	$ LC_ALL=C debdiff mozilla-noscript_2.6.9.23~rc{2,3}-1_amd64.changes
	File lists identical (after any substitutions)
	
	Control files: lines which differ (wdiff format)
	------------------------------------------------
	Version: [-2.6.9.23~rc2-1-] {+2.6.9.23~rc3-1+}

Downgrading dpkg-dev (and libdpkg-perl) to 1.17.25 also fixes the issue.

Regards

David

-- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'stable'), (110, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.0.0-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages dpkg-dev depends on:
ii  base-files    9.2
ii  binutils      2.25-7
ii  bzip2         1.0.6-8
ii  libdpkg-perl  1.18.0
ii  make          4.0-8.1
ii  patch         2.7.5-1
ii  xz-utils      5.1.1alpha+20120614-2+b3

Versions of packages dpkg-dev recommends:
ii  build-essential          11.7
ii  fakeroot                 1.20.2-1
ii  gcc [c-compiler]         4:4.9.2-4
ii  gcc-4.6 [c-compiler]     4.6.4-7
ii  gcc-4.7 [c-compiler]     4.7.4-3
ii  gcc-4.8 [c-compiler]     4.8.4-2
ii  gcc-4.9 [c-compiler]     4.9.2-18
ii  gnupg                    1.4.19-2
ii  gnupg2                   2.0.26-6
ii  gpgv                     1.4.19-2
ii  libalgorithm-merge-perl  0.08-2

Versions of packages dpkg-dev suggests:
ii  debian-keyring  2015.05.17

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