What's the point having GLIBC_ABI_DT_RELR?

[Florian Weimer]

* Bjørn Mork via Libc-help:

> Isn't the whole GLIBC_ABI_DT_RELR test just unnecessarily preventing
> glibc from loading libraries with DT_RELR?  Any glibc version testing
> for it will also support DT_RELR. So it would have worked fine if it
> weren't for the test.  Looks like unnecessary forced breakage - there
> must be something I'm missing. But what?

The purpose of the check is to stop the proliferation of binaries that
crash when loaded by glibc versions that do not support DT_RELR.

Thanks,
Florian