[Bug debug/36690] [4.3/4.4 Regression] .debug_line first line is behind the first instruction

["jsm28 at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>]

------- Comment #1 from jsm28 at gcc dot gnu dot org  2008-07-01 15:52 -------
I've also observed this problem (as causing a number of GDB testsuite
failures).

With both 4.2 and 4.3, the function prologue is followed by a jump,
the loop body, and then the test of the loop condition which the jump
jumps to.  The loop body has the correct line number, as does the
condition.  With 4.2, the jump has the same line number as the
condition, so that's the line number to which GDB assigns a breakpoint
on the function.  With 4.3, the jump insn does not have a line number
and GDB decides to use the line number of the loop body, and the GDB
tests fail.


-- 

jsm28 at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2008-07-01 15:52:34
               date|                            |
            Summary|.debug_line first line is   |[4.3/4.4 Regression]
                   |behind the first instruction|.debug_line first line is
                   |                            |behind the first instruction
   Target Milestone|---                         |4.3.2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36690