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[Bug ld/21562] Refs to __start_SCN of non-orphan sections affect --gc-se


From: hjl.tools at gmail dot com
Subject: [Bug ld/21562] Refs to __start_SCN of non-orphan sections affect --gc-sections
Date: Fri, 09 Jun 2017 19:11:04 +0000

https://sourceware.org/bugzilla/show_bug.cgi?id=21562

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |hjl.tools at gmail dot com

--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
_bfd_elf_gc_mark_rsec has

      if (start_stop != NULL) 
        {
          /* To work around a glibc bug, mark all XXX input sections
             when there is an as yet undefined reference to __start_XXX
             or __stop_XXX symbols.  The linker will later define such
             symbols for orphan input sections that have a name
             representable as a C identifier.  */
          asection *s = _bfd_elf_is_start_stop (info, h);

          if (s != NULL) 
            {
              *start_stop = !s->gc_mark;
              return s;
            }
        }

The question is if ELF linker automatically creates a definition when
there is a reference, regardless if the input section is orphan or not.

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