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Re: release soonish

On Fri, Jan 20, 2012 at 01:05:04PM -0800, Roland McGrath wrote:
> Mark is going to look into a new elflint-self regression on Fedora 17.
> Chances are that is a toolchain bug rather than something for us to fix.
> But it needs figured out before we consider a release.

The issue is as follows on x86_64 with gcc (GCC) 4.7.0 20120119
(Red Hat 4.7.0-0.8) and binutils-2.22-4.fc17.x86_64 any program
will have a __TMC_END__ symbol in .symtab that looks as follows:
   66: 0000000000600850      0 OBJECT  GLOBAL HIDDEN        24 __TMC_END__
Section 24 is:
[24] .data                PROGBITS     0000000000600848 00000848 00000004  0 WA     0   0  4
So the address of __TMC_END__ is just beyond the end of the .data section.

__TMC_END__ comes from /usr/lib/gcc/x86_64-redhat-linux/4.7.0/crtend.o
   12: 0000000000000000      0 OBJECT  GLOBAL HIDDEN         6 __TMC_END__
[ 6] .tm_clone_table      PROGBITS     0000000000000000 00000050 00000000  0 WA     0   0  8

I assume this is a linker bug. In elflint we already have special cases
for some issues with gnu ld for this particular error:

      if (sym->st_value - sh_addr > destshdr->sh_size)
          /* GNU ld has severe bugs.  When it decides to remove
             empty sections it leaves symbols referencing them
             behind.  These are symbols in .symtab.  */
          if (!gnuld
              || strcmp (section_name (ebl, idx), ".symtab")
              || (strcmp (name, "__preinit_array_start") != 0
                  && strcmp (name, "__preinit_array_end") != 0
                  && strcmp (name, "__init_array_start") != 0
                  && strcmp (name, "__init_array_end") != 0
                  && strcmp (name, "__fini_array_start") != 0
                  && strcmp (name, "__fini_array_end") != 0))
            ERROR (gettext ("\
section [%2d] '%s': symbol %zu: st_value out of bounds\n"),
                   idx, section_name (ebl, idx), cnt);

Do we want an extra special case, or shall I file a bug report against
gnu ld?



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