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Re: Identifying when collations change


On 09 Jul 2015 20:42, Craig Ringer wrote:
> On 9 July 2015 at 18:01, Mike Frysinger <vapier@gentoo.org> wrote:
> > On 09 Jul 2015 10:15, OndÅej BÃlka wrote:
> >> On Wed, Jul 08, 2015 at 02:10:40AM -0400, Mike Frysinger wrote:
> 
> >> > i don't know about a portable answer, but perhaps extending nl_langinfo would
> >> > be more on the painless side of things ?  adding a GNU-specific keyword that'd
> >> > return a hash of the collation data so you could easily check. </naive>
> 
> It'd want to be per-collation, so you don't do unnecessary work if a
> locale you aren't using changes.

nl_langinfo operates on the current locale, so you'd have to take care of 
matching the two pieces of data together.

> Is there any sane, generic way we might generate a collation
> "fingerprint" application-side? Or anything within glibc that could
> help?

your best bet for something now would be to maintain a structure that 
fingerprinted collation data in specific glibc versions and then check
the current version at runtime.  yes, it'd require a good amount of effort
and the code would always be behind, but it would work(ish).
-mike

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