[ELF] Allow R_PLT_PC (R_PC) to a hidden undefined weak symbol

This essentially reverts b841e119d77ed0502e3a2e710f26a899bef28b3c.

Such code construct can be used in the following way:

  // glibc/stdlib/exit.c
  // clang -fuse-ld=lld => succeeded
  // clang -fuse-ld=lld -fpie -pie => relocation R_PLT_PC cannot refer to absolute symbol
  __attribute__((weak, visibility("hidden"))) extern void __call_tls_dtors();
  void __run_exit_handlers() {
    if (__call_tls_dtors)
        __call_tls_dtors();
  }

Since we allow R_PLT_PC in -no-pie mode, it makes sense to allow it in
-pie mode as well.

Reviewed By: pcc

Differential Revision: https://reviews.llvm.org/D72943

(cherry picked from commit 6ab89c3c5df8b679e6ee240a13356309c048fc71)

0 files changed, 0 insertions, 0 deletions