Bug#799856: libc6: strftime doesn't honor the charmap

[Vincent Lefevre <vincent@vinc17.net>]

Package: libc6
Version: 2.19-22
Severity: normal

strftime doesn't honor the charmap. The following shows that strftime
yields ISO-8859-1 characters while the charmap is UTF-8.

$ locale
LANG=POSIX
LANGUAGE=
LC_CTYPE=en_US.UTF-8
LC_NUMERIC="POSIX"
LC_TIME=fr_FR
LC_COLLATE=POSIX
LC_MONETARY="POSIX"
LC_MESSAGES="POSIX"
LC_PAPER="POSIX"
LC_NAME="POSIX"
LC_ADDRESS="POSIX"
LC_TELEPHONE="POSIX"
LC_MEASUREMENT="POSIX"
LC_IDENTIFICATION="POSIX"
LC_ALL=
$ locale charmap
UTF-8
$ date -d 2015-02-07 +%b
f�vr.
$ date -d 2015-02-07 +%B
f�vrier
$ date -d 2015-02-07 +%B | hd
00000000  66 e9 76 72 69 65 72 0a                           |f.vrier.|
00000008

Note that there is no such problem with LC_MESSAGES, e.g.:

$ LC_MESSAGES=fr_FR cp
cp: opérande de fichier manquant
Saisissez « cp --help » pour plus d'informations.

is UTF-8 as expected.

-- System Information:
Debian Release: stretch/sid
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'unstable'), (500, 'testing'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 4.1.0-2-amd64 (SMP w/8 CPU cores)
Locale: LANG=POSIX, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages libc6 depends on:
ii  libgcc1  1:5.2.1-17

libc6 recommends no packages.

Versions of packages libc6 suggests:
ii  debconf [debconf-2.0]  1.5.57
ii  glibc-doc              2.19-22
ii  locales                2.19-22

-- debconf information:
  glibc/restart-services:
  libraries/restart-without-asking: false
  glibc/restart-failed:
  glibc/disable-screensaver:
  glibc/upgrade: true