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

[Ulrich Mueller <ulm@gentoo.org>]

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>>>>> On Wed, 11 Nov 2015, René Neumann wrote:

>> 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

This is wrong on so many levels. :( It starts with the fact that the
dot over the lowercase latin i historically never was a diacritical
mark [1].

Maybe we should advise users in our documentaion that they should
avoid such broken locales for ebuilds?

Ulrich


[1] https://commons.wikimedia.org/wiki/File:Evolution_of_minuscule.svg

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