[PATCH] D42748: [ELF] Don't create a .dynamic section when linking with -Bstatic

[Fangrui Song via Phabricator via llvm-commits]

MaskRay added a comment.

@arichardson @emaste @kib

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236165 was raised again recently.
I'll reiterate that I think lld's current behavior (after rL295240 <https://reviews.llvm.org/rL295240>) is quite reasonable.

> lld: has_dso || --shared || --pie || --export-dynamic
>  gold: has_dso || --shared || --pie
>  bfd: (--shared || --pie) || ((not -r) && info->nointerp && (info->export_dynamic || info->dynamic)) && some (almost always true) conditions

The following example demonstrates why ld.bfd's behavior is unreasonable.

  % cat <e >> a.s
  .globl _start
  _start:
  e
  % as a.s -o a.o
  % ld.bfd a.o --export-dynamic -o a; readelf -S a | grep -c dynsym
  0
  % ld.bfd a.o --no-dynamic-linker --export-dynamic -o a; readelf -S a | grep -c dynsym
  1

`--no-dynamic-linker` was invented to fix its historical mistake: hard-coded ld.so path (e.g. `/lib/ld64.so.1` on x86-64). The fallout caused trouble to static pie (so a new -static-pie was invented).


Repository:
  rLLD LLVM Linker

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D42748/new/

https://reviews.llvm.org/D42748