[Bug debug/40521] [4.4/4.5 Regression] -g causes GCC to generate .eh_frame

["jakub at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #12 from jakub at gcc dot gnu dot org  2009-10-09 19:17 -------
Ah, now I see it in the 4.4 version.  Your backport is wrong then, you must not
return true from dwarf2out_do_cfi_asm when !eh_personality_libfunc, but
HAVE_GAS_CFI_SECTIONS_DIRECTIVE is 0 and not emitting normal unwind info.

Either you want:
int
dwarf2out_do_cfi_asm (void)
{
  int enc;

#ifdef MIPS_DEBUGGING_INFO
  return false;
#endif
  if (!flag_dwarf2_cfi_asm || !dwarf2out_do_frame ())
    return false;
  if (saved_do_cfi_asm)
    return true;
  if (eh_personality_libfunc)
    {
      if (!HAVE_GAS_CFI_PERSONALITY_DIRECTIVE)
        return false;

      /* Make sure the personality encoding is one the assembler can support.
         In particular, aligned addresses can't be handled.  */
      enc = ASM_PREFERRED_EH_DATA_FORMAT (/*code=*/2,/*global=*/1);
      if ((enc & 0x70) != 0 && (enc & 0x70) != DW_EH_PE_pcrel)
        return false;
      enc = ASM_PREFERRED_EH_DATA_FORMAT (/*code=*/0,/*global=*/0);
      if ((enc & 0x70) != 0 && (enc & 0x70) != DW_EH_PE_pcrel)
        return false;
    }

  if (!HAVE_GAS_CFI_SECTIONS_DIRECTIVE)
    {
#ifdef TARGET_UNWIND_INFO
      return false;
#else
      if (USING_SJLJ_EXCEPTIONS || (!flag_unwind_tables && !flag_exceptions))
        return false;
#endif
    }

  saved_do_cfi_asm = true;
  return true;
}

or move the !HAVE_GAS_CFI_SECTIONS_DIRECTIVE tests in between if
(saved_do_cfi_asm) return true; and if (!eh_personality_libfunc) return true;.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40521