[Bug debug/40660] New: [4.5 Regression] Wierd break points with 4.5, works with 4.4

[Bug debug/40660] New: [4.5 Regression] Wierd break points with 4.5, works with 4.4

[burnus at gcc dot gnu dot org]

Maybe this is a side effect of fixing a DWARF bug, but using GCC 4.5 with
gdb (GDB) SUSE (6.8.50.20090302-41.3) [contains "Merge FC11 update 23"] does
not work while with GCC 4.4 it does.

Example (compile with gfortran -g):

PROGRAM test
  INTEGER, DIMENSION(3) :: a1,a2
  a1 = 1
  PRINT*, a1
  a2 = 2
end program test

GCC 4.4 with gdb:

(gdb) b 3
Breakpoint 1 at 0x4007a7: file test.f90, line 3.
(gdb) run
Starting program: /dev/shm/a.out
Breakpoint 1, test () at test.f90:3
3         a1 = 1
Current language:  auto; currently fortran
(gdb) n
4         PRINT*, a1
(gdb) pt a1
type = integer(kind=4) (3)
(gdb) p a1
$1 = (1, 1, 1)
(gdb) n
           1           1           1
5         a2 = 2


GCC 4.5 with gdb:

(gdb) b 3
Breakpoint 1 at 0x400738: file test.f90, line 3.
(gdb) run
Starting program: /dev/shm/a.out
Breakpoint 1, test () at test.f90:3
3         a1 = 1
Current language:  auto; currently fortran
(gdb) p a1
$1 = (8, 0, -1417923840)
(gdb) n
           1           1           1
0x00002aaaab48ca4d in __libc_start_main () from /lib64/libc.so.6


-- 
           Summary: [4.5 Regression] Wierd break points with 4.5, works with
                    4.4
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Keywords: wrong-debug
          Severity: normal
          Priority: P3
         Component: debug
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: burnus at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40660

[Bug debug/40660] [4.5 Regression] Wierd break points with 4.5, works with 4.4

[steven at gcc dot gnu dot org]

-- 

steven 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         |2009-07-15 07:28:00
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40660

[Bug debug/40660] [4.5 Regression] Wierd break points with 4.5, works with 4.4

[steven at gcc dot gnu dot org]

-- 

steven at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.5.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40660

[Bug debug/40660] [4.5 Regression] Wierd break points with 4.5, works with 4.4

[jsm28 at gcc dot gnu dot org]

------- Comment #1 from jsm28 at gcc dot gnu dot org  2009-07-29 22:52 -------
Setting to P4, but restore to P3 if a C or C++ test for this bug is found.


-- 

jsm28 at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P4


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40660

[Bug debug/40660] [4.5 Regression] Wierd break points with 4.5, works with 4.4

[burnus at gcc dot gnu dot org]

------- Comment #2 from burnus at gcc dot gnu dot org  2009-08-07 14:41 -------
Using 4.5.0 20090805 with GDB 6.8.50.20090803-10.1 (includes patches of
Fedora/Jan Kratochvil which support F90 arrays/C99 VLA and module variables),
the result is now:

Breakpoint 1, test () at fhjf.f90:3
3         a1 = 1
(gdb) n
4         PRINT*, a1(1)
(gdb)
3         a1 = 1
(gdb)
4         PRINT*, a1(1)
(gdb)
           1

That is: Every line is poperly hit, but one has to cycle through "a1 =1;
print*,a1" twice before the PRINT is actually executed.

(Using GCC/gfortran 4.4 with the same gdb the result is as expected: One walk
through the program, line by line.)

(I heard that there were some similar weird things happening under C but I have
not managed to create a test case.)


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40660

[Bug debug/40660] [4.5 Regression] Wierd break points with 4.5, works with 4.4

[jv244 at cam dot ac dot uk]

------- Comment #3 from jv244 at cam dot ac dot uk  2009-08-07 17:28 -------
Is there some meta-bug about Fortran-related debug issues? I've added PR 40823
about another debug issue. It likely requires a FE fix, so the component
'debug' is somewhat too vague.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40660

[Bug debug/40660] [4.5 Regression] Wierd break points with 4.5, works with 4.4

[burnus at gcc dot gnu dot org]

------- Comment #4 from burnus at gcc dot gnu dot org  2009-08-14 13:36 -------
Checking with eu-readelf -w info shows that -- according to "Line number
statements" -- the line jumping is really a GCC problem.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40660

[Bug debug/40660] [4.5 Regression] Wierd break points with 4.5, works with 4.4

[burnus at gcc dot gnu dot org]

------- Comment #5 from burnus at gcc dot gnu dot org  2009-08-21 18:04 -------
Working: 2009-07-10, r149458
Failing: 2009-07-17, r149734


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40660

[Bug debug/40660] [4.5 Regression] Wierd break points with 4.5, works with 4.4

[burnus at gcc dot gnu dot org]

------- Comment #6 from burnus at gcc dot gnu dot org  2009-08-21 18:34 -------
Aldy, I think your patch (r149722, PR 40435) might have caused this. Could you
have a look?


-- 

burnus at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |aldyh at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40660

[Bug debug/40660] [4.5 Regression] Wierd break points with 4.5, works with 4.4

[aldyh at gcc dot gnu dot org]

------- Comment #7 from aldyh at gcc dot gnu dot org  2009-08-21 21:11 -------
Sorry I was out on vacation.  I will take a look.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40660

[Bug debug/40660] [4.5 Regression] Wierd break points with 4.5, works with 4.4

[burnus at gcc dot gnu dot org]

------- Comment #8 from burnus at gcc dot gnu dot org  2009-08-22 09:38 -------
> Sorry I was out on vacation.  I will take a look.
Well, I only CCed you yesterday :-) Thanks for taking a look!

I rechecked: It is indeed Rev. 149722 which caused the problem of this PR (as
described in comment 2).

(Part of PR 40823 is probably a duplicate of this issue; there is another issue
stated in that PR, which is not a regression (i.e. never worked correctly), but
has probably a similar cause.)


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40660

[Bug debug/40660] [4.5 Regression] Weird break points with 4.5, works with 4.4

[aldyh at gcc dot gnu dot org]

------- Comment #9 from aldyh at gcc dot gnu dot org  2009-08-24 18:34 -------
Fixed thusly
http://gcc.gnu.org/ml/gcc-patches/2009-08/msg01306.html


-- 

aldyh at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |aldyh at gcc dot gnu dot org
                   |dot org                     |
             Status|NEW                         |ASSIGNED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40660

[Bug debug/40660] [4.5 Regression] Weird break points with 4.5, works with 4.4

[jv244 at cam dot ac dot uk]

------- Comment #10 from jv244 at cam dot ac dot uk  2009-08-24 19:05 -------
(In reply to comment #8)
>
> (Part of PR 40823 is probably a duplicate of this issue; there is another issue
> stated in that PR, which is not a regression (i.e. never worked correctly), but
> has probably a similar cause.)
>
I tried the switch (-fdump-tree-original-lineno, noticed in Aldy's patch) on
the PR40823 testcase, but there is no reference to line 2 in the output of
'-fdump-tree-original-lineno', just proper reference to lines 4 and 7, so I
guess the issue is elsewhere ?


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40660

[Bug debug/40660] [4.5 Regression] Weird break points with 4.5, works with 4.4

[aldyh at gcc dot gnu dot org]

------- Comment #11 from aldyh at gcc dot gnu dot org  2009-08-25 00:28 -------
Subject: Bug 40660

Author: aldyh
Date: Tue Aug 25 00:27:52 2009
New Revision: 151069

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=151069
Log:
fortran/
        PR fortran/40660
        * trans-io.c (build_dt): Pass UNKNOWN_LOCATION to build_call_expr_loc.
        (transfer_array_desc): Same.


Added:
    trunk/gcc/testsuite/gfortran.dg/PR40660.f90
Modified:
    trunk/gcc/fortran/ChangeLog
    trunk/gcc/fortran/trans-io.c


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40660

[Bug debug/40660] [4.5 Regression] Weird break points with 4.5, works with 4.4

[jv244 at cam dot ac dot uk]

------- Comment #12 from jv244 at cam dot ac dot uk  2009-09-03 06:50 -------
looks like this is fixed on trunk.


-- 

jv244 at cam dot ac dot uk changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40660