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Author SHA1 Message Date
Fangrui Song 6ab89c3c5d [ELF] Allow R_PLT_PC (R_PC) to a hidden undefined weak symbol 
This essentially reverts b841e119d7.

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
 2020-01-17 13:06:42 -08:00
Fangrui Song b159906a9a [test] Change llvm-readobj -long-option to --long-option or well-known short options. NFC 
Also change some options that have different semantics (cause confusion) in llvm-readelf mode:

-s => -S
-t => --symbols
-sd => --section-data

llvm-svn: 359651
 2019-05-01 05:49:01 +00:00
Rafael Espindola 3666025880 Two small related fixes. 
* A hidden undefined is not preemptable.
* It is always zero, so we don't need a dynamic reloc for it.

llvm-svn: 266424
 2016-04-15 11:57:07 +00:00