[Bug debug/92204] Confusing GDB output for an optimized C program

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92204

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |aoliva at gcc dot gnu.org

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
main ()
{
  <bb 2> [local count: 1073741824]:
  # DEBUG BEGIN_STMT
  # DEBUG i => 0
  # DEBUG BEGIN_STMT
  # DEBUG i => 1
  # DEBUG BEGIN_STMT
  return 0;

}

main:
.LFB0:
        .file 1 "t.c"
        .loc 1 2 1
        .cfi_startproc
        .loc 1 3 3
.LVL0:
        .loc 1 4 3
        .loc 1 5 3
        .loc 1 6 1 is_stmt 0
        xorl    %eax, %eax
        ret

So I guess this is an issue with SFN not supported by gdb.  Note that
for me it always prints 1 (at 'start' as well as at end).  Note there
are not enough different PCs to describe all program states without SFN.

I have tried gdb 8.2.