[PATCH] Add GLIBC_PRIVATE_RELR as proxy for DT_RELR

[Florian Weimer]

* H. J. Lu:

> Executables with DT_RELR will crash mysteriously with glibc binaries
> without DT_RELR support.  Bump EI_ABIVERSION won't prevent crash since
> the Linux kernel loader doesn't check EI_ABIVERSION on executables.
> Adding a glibc version dependency on the first glibc version with
> DT_RELR support will prevent backporting DT_RELR support to released
> glibc branches.
>
> Add a GLIBC_PRIVATE_RELR version as a proxy for DT_RELR support in glibc.
> Linker should add the GLIBC_PRIVATE_RELR version dependency on binaries
> with DT_RELR.  GLIBC_PRIVATE_RELR should be backported together when
> backporting DT_RELR support.

I don't like it.  What's wrong about EI_ABIVERSION?

The kernel doesn't need to check EI_ABIVERSION because it does not do
relocation processing.

Thanks,
Florian