glibc updarte 2.31 to 2.38

Hi,

we have SLES 15.5 which has glibc 2.31. Our admin told us that he's about to install the SLES 15.6 update which contains glibc 2.38.

I have built our PostgreSQL software from source on SLES 15.5, because we have some special requirements which the packages cannot fulfill. So I have questions:

1) Do I have to build it again on 15.6?

2) Does the glibc update have any impact? I recall having to have everything reindexed when the 2.28 update came due to major locale changes, but I didn't have to do it since then.

3) Where and how can I find out if it is necessary to reindex? And how can I find out what indexes would be affected.

I'd really appreciate your comments. Thanks very much in advance.

Paul