PIE and shared objects usually have many relative relocations. In
2017/2018, a compact relative relocation format RELR was proposed on
("Proposal for a new section type SHT_RELR") and is a pre-standard.
RELR usually takes 3% or smaller space than R_*_RELATIVE relocations.
The virtual memory size of a mostly statically linked PIE is typically 5~10% smaller.
ld.lld --pack-dyn-relocs=relr emits RELR relocations. DT_RELR has been
adopted by Android bionic, Linux kernel's arm64 port, Chrome OS (patched
This patch adds DT_RELR support to rtld-elf.
Author: Fangrui Song <email@example.com>