[Bug fortran/24526] New: variables from modules not visible in gdb

[Bug fortran/24526] New: variables from modules not visible in gdb

[tkoenig at gcc dot gnu dot org]

$ cat module.f90
module foo
  real :: a
end module foo

program main
  use foo, only : a
  a = 42.
  print *,a
end program main
$ gfortran -g module.f90
$ gdb ./a.out
GNU gdb 6.3-debian
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-linux"...Using host libthread_db library
"/lib/tls/libthread_db.so.1".

(gdb) b module.f90:7
Breakpoint 1 at 0x80485e4: file module.f90, line 7.
(gdb) r
Starting program: /home/ig25/Krempel/Gdb/a.out

Breakpoint 1, MAIN__ () at module.f90:7
7         a = 42.
Current language:  auto; currently fortran
(gdb) p a
No symbol "a" in current context.
(gdb)

$ gfortran -v
Using built-in specs.
Target: i686-pc-linux-gnu
Configured with: ../gcc-4.1/configure --prefix=/home/ig25
--enable-languages=c,fortran : (reconfigured) ../gcc-4.1/configure
--prefix=/home/ig25 --enable-languages=c,fortran --no-create --no-recursion
Thread model: posix
gcc version 4.1.0 20051011 (experimental)
$ gdb --version
GNU gdb 6.3-debian
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-linux".


-- 
           Summary: variables from modules not visible in gdb
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Keywords: wrong-debug
          Severity: normal
          Priority: P2
         Component: fortran
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: tkoenig at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24526

[Bug fortran/24526] variables from modules not visible in gdb

[woodzltc at sources dot redhat dot com]

------- Comment #1 from woodzltc at sources dot redhat dot com  2005-10-26 03:25 -------
Variable a in modular foo is represented as __foo__a in the DWARF output.  So
you can use "print __foo__a" to get the value of modular variable a.

[woodzltc@plinuxt2 ~]$ gdb -q ./modular
Using host libthread_db library "/lib64/tls/libthread_db.so.1".
(gdb) b modular.f90:7
Breakpoint 1 at 0x10001700: file modular.f90, line 7.
(gdb) r
Starting program: /home/woodzltc/modular

Breakpoint 1, MAIN__ () at modular.f90:7
7         a = 42.
Current language:  auto; currently fortran
(gdb) p __foo__a
$2 = 0
(gdb) n
8         print *,a
(gdb) p __foo__a
$3 = 42
(gdb)

To let gdb recognize 'a' directly, some trick in gdb might be needed.


-- 

woodzltc at sources dot redhat dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |woodzltc at sources dot
                   |                            |redhat dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24526

[Bug fortran/24526] variables from modules not visible in gdb

[pinskia at gcc dot gnu dot org]

------- Comment #2 from pinskia at gcc dot gnu dot org  2005-10-27 23:15 -------
(In reply to comment #1)
> To let gdb recognize 'a' directly, some trick in gdb might be needed.

I don't know if some trickery is needed, just we might need to emit something
like what C++ does with it using statements.


-- 

pinskia 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         |2005-10-27 23:15:15
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24526

[Bug fortran/24526] variables from modules not visible in gdb

[steven at gcc dot gnu dot org]

------- Comment #3 from steven at gcc dot gnu dot org  2006-10-14 14:21 -------
There is support for Fortran module variables in DWARF3, see
http://dwarf.freestandards.org/Dwarf3.pdf.

Unfortunately GDB doesn't seem to support this.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24526

[Bug fortran/24526] variables from modules not visible in gdb

[burnus at gcc dot gnu dot org]

------- Comment #4 from burnus at gcc dot gnu dot org  2008-08-21 21:31 -------
I think the gfortran part is fixed by PR 29635. The rest has to be solved in
gdb. Other debugers seem to have also some problems, e.g. Intel's idb, cf.
http://gcc.gnu.org/ml/fortran/2008-08/msg00128.html


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24526

[Bug fortran/24526] variables from modules not visible in gdb

[burnus at gcc dot gnu dot org]

------- Comment #5 from burnus at gcc dot gnu dot org  2009-05-29 07:43 -------
Is this a duplicate of PR 40040?


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24526