[Bug ld/27923] ld: Support DT_RELR relative relocation format

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27923

--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
[hjl@gnu-cfl-2 tmp]$ gcc -pie -fPIE -O2 tst-relr.c
-Wl,--pack-dyn-relocs=relr -fuse-ld=lld
[hjl@gnu-cfl-2 tmp]$ ./a.out
Segmentation fault (core dumped)
[hjl@gnu-cfl-2 tmp]$

Given that the current lld implementation generates broken
binaries for existing glibc without any warning at run-time,
we need a different linker command line option to implement
it properly so that the new binary will fail to run on glibc
without DT_RELR support at run-time.

We can do "-z relr=glibc" which generates DT_RELR and adds a
glibc version dependency against the first version of glibc
with DT_RELR support.

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