[PATCH 3/7] Add GLIBC_ABI_DT_RELR for DT_RELR support

[Joseph Myers]

On Thu, 3 Feb 2022, H.J. Lu via Libc-alpha wrote:

> +%if HAVE_DT_RELR
> +  GLIBC_ABI_DT_RELR {
> +    # This symbol is used only for empty version map and will be removed
> +    # by scripts/versions.awk.
> +    __placeholder_only_for_empty_version_map;
> +  }

My understanding is that HAVE_DT_RELR describes a property of the linker 
used to build glibc, not a property of what features glibc itself 
supports.

The symbol versions provided by glibc, and whether glibc supports binaries 
using RELR relocations, should be independent of whether the linker 
version used to build glibc supports such relocations.  A given glibc 
version should either always support RELR relocations (for a given glibc 
ABI) or never support them (for that ABI), independent of linker features, 
and likewise the symbol versions provided by glibc should be independent 
of linker features.

-- 
Joseph S. Myers
joseph@codesourcery.com