Re: [gentoo-dev] [RFC] ban use of base-4 casemods in ebuilds due to locale collation instability

["René Neumann" <lists@necoro.eu>]

Am 11.11.2015 um 05:16 schrieb Ulrich Mueller:
>>>>>> On Tue, 10 Nov 2015, Mike Frysinger wrote:
> 
>> Arfrever highlights these are not even safe to use.  bash is locale aware,
>> so it'll apply LC_COLLATE rules when processing the ^/, casemods.  while
>> you can fix this with external programs ala:
>> 	LC_COLLATE=C tr ...
> 
>> you can't do it with inline code like:
>> 	LC_COLLATE=C SRC_URI=".../${PN^^}/..."
> 
>>>>>> On Tue, 10 Nov 2015, Mike Frysinger wrote:
> 
>> sorry, i meant char classification here (LC_CTYPE), not collation.
> 
> Shouldn't these be safe to use if the string consists purely of ASCII
> characters? I mean, A-Z and a-z should be uppercase and lowercase,
> respectively, in any locale?

Unfortunately, no (have been bitten by this issue already some years ago):

$ echo $LC_ALL
tr_TR
$ f=i; echo ${f^^}
İ
$ f=I; echo ${f,}
ı

- René