Bug? in bash setlocale implementation

[John Kearney]

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Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64'
- -DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-pc-linux-gnu'
- -DCONF_VENDOR='pc' -DLOCALEDIR='/usr/s
uname output: Linux DETH00 3.0.0-15-generic #26-Ubuntu SMP Fri Jan 20
17:23:00 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
Machine Type: x86_64-pc-linux-gnu

Bash Version: 4.2
Patch Level: 10
Release Status: release

Description:
  Basically if setting the locale fails variable should not be changed.

 Consider


export LC_CTYPE=

bash -c 'LC_CTYPE=ISO-8859-1 eval printf "\${LC_CTYPE:-unset}"'
bash: warning: setlocale: LC_CTYPE: cannot change locale (ISO-8859-1):
No such file or directory
ISO-8859-1

ksh93 -c 'LC_CTYPE=ISO-8859-1 eval printf "\${LC_CTYPE:-unset}"'
ISO-8859-1: unknown locale
unset
ksh93 -c 'LC_CTYPE=C.UTF-8 eval printf "\${LC_CTYPE:-unset}"'
C.UTF-8

  the advantage being you can check in the script if the local change
worked.
  e.g.
  LC_CTYPE=ISO-8859-1
  [ "${LC_CTYPE:-}" = "ISO-8859-1" ] || error exit
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