[PATCH] D70398: [lld] Support copy relocations for TLS symbols

[Fangrui Song via Phabricator via llvm-commits]

MaskRay added a comment.

TLS copy relocation requires cooperation from the dynamic loader. Just skimmed through several dynamic loader implementations:

- glibc: `sysdeps/riscv/dl-machine.h`
- musl: https://git.musl-libc.org/cgit/musl/tree/ldso/dynlink.c `case REL_COPY:`
- FreeBSD ld.so: `libexec/rtld-elf/riscv/reloc.c`

None special cases STT_TLS and copies the data from the shared object to the TLS image in the executable. So even if lld supported TLS copy relocation, it would not work because the TLS image would not be properly initialized.


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  https://reviews.llvm.org/D70398/new/

https://reviews.llvm.org/D70398