[Bug lto/67548] [5/6 Regression] LTO drops weak binding with "ld -r"

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67548

--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
We have

enum ld_plugin_symbol_resolution
{
  LDPR_UNKNOWN = 0,

  /* Symbol is still undefined at this point.  */
  LDPR_UNDEF,

  /* This is the prevailing definition of the symbol, with references from
     regular object code.  */
  LDPR_PREVAILING_DEF,

  /* This is the prevailing definition of the symbol, with no
     references from regular objects.  It is only referenced from IR
     code.  */
  LDPR_PREVAILING_DEF_IRONLY,

  /* This definition was pre-empted by a definition in a regular
     object file.  */
  LDPR_PREEMPTED_REG,

  /* This definition was pre-empted by a definition in another IR file.  */
  LDPR_PREEMPTED_IR,

  /* This symbol was resolved by a definition in another IR file.  */
  LDPR_RESOLVED_IR,

  /* This symbol was resolved by a definition in a regular object
     linked into the main executable.  */
  LDPR_RESOLVED_EXEC,

  /* This symbol was resolved by a definition in a shared object.  */
  LDPR_RESOLVED_DYN,

  /* This is the prevailing definition of the symbol, with no
     references from regular objects.  It is only referenced from IR
     code, but the symbol is exported and may be referenced from
     a dynamic object (not seen at link time).  */
  LDPR_PREVAILING_DEF_IRONLY_EXP
};

None of them is applicable to a weakdef with "ld -r".