[Bug gdb/11964] support for debugging multithreaded openmp

[Bug gdb/11964] support for debugging multithreaded openmp

[sergiodj at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=11964

Sergio Durigan Junior <sergiodj at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |RESOLVED
                 CC|                            |sergiodj at redhat dot com
         Resolution|---                         |OBSOLETE

--- Comment #3 from Sergio Durigan Junior <sergiodj at redhat dot com> ---
Closing as OBSOLETE due to inactivity.  Feel free to reopen if still valid.

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[Bug gdb/11964] New: support for debugging multithreaded openmp

[hicham at mouline dot org]

Hello,
While debugging this program
https://computing.llnl.gov/tutorials/openMP/samples/C/omp_hello.c
under emacs/GUD with gdb, putting a breakpoint inside the parallel region, line 
30, triggers a stop at that point.
However, stepping over generates this error
"Cannot find bounds of current function", when the cursor hits line 22 (the 
pragma line)

The program was built with gcc (GCC) 4.4.4 20100630 (Red Hat 4.4.4-10), and its 
associated libgomp library.

A fix is proposed by jan.kratochvil@redhat.com though I'm not sure it's related 
to this particular point:
http://cvs.fedoraproject.org/viewvc/rpms/gdb/devel/gdb-bz533176-fortran-omp-
step.patch?content-type=text%2Fplain&view=co


regards,

-- 
           Summary: support for debugging multithreaded openmp
           Product: gdb
           Version: 7.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
        AssignedTo: unassigned at sourceware dot org
        ReportedBy: hicham at mouline dot org
                CC: gdb-prs at sourceware dot org
 GCC build triplet: x86_64-redhat-linux-gnu
  GCC host triplet: Linux 2.6.33.3 x86_64
GCC target triplet: 7.1-33.fc13


http://sourceware.org/bugzilla/show_bug.cgi?id=11964

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[Bug gdb/11964] support for debugging multithreaded openmp

[hicham at mouline dot org]

------- Additional Comments From hicham at mouline dot org  2010-09-01 03:55 -------
I forgot to say that:

Jan Kratochvil [jan.kratochvil@redhat.com] says
"it is only a hack, there should be some proper DWARF annotation instead."

regards,

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http://sourceware.org/bugzilla/show_bug.cgi?id=11964

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[Bug gdb/11964] support for debugging multithreaded openmp

[jan dot kratochvil at redhat dot com]

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           What    |Removed                     |Added
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                 CC|                            |jan dot kratochvil at redhat
                   |                            |dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=11964

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[Bug gdb/11964] support for debugging multithreaded openmp

[jan dot kratochvil at redhat dot com]

------- Additional Comments From jan dot kratochvil at redhat dot com  2010-09-03 06:14 -------
Using
GNU gdb (GDB) 7.2.50.20100903-cvs
gcc-4.4.4-10.fc13.x86_64

(gdb) start
Temporary breakpoint 1 at 0x4006a3: file omp_hello.c, line 22.
Starting program: /home/jkratoch/t/omp_hello 
[Thread debugging using libthread_db enabled]

Temporary breakpoint 1, main (argc=1, argv=0x7fffffffded8) at omp_hello.c:22
22	#pragma omp parallel private(nthreads, tid)
(gdb) step
[New Thread 0x7ffff7fd8710 (LWP 15656)]
[New Thread 0x7ffff75d7710 (LWP 15657)]
[New Thread 0x7ffff6bd6710 (LWP 15658)]
[New Thread 0x7ffff61d5710 (LWP 15659)]
[New Thread 0x7ffff57d4710 (LWP 15660)]
[New Thread 0x7ffff4dd3710 (LWP 15661)]
[New Thread 0x7ffff43d2710 (LWP 15662)]
Hello World from thread = 3
main.omp_fn.0 (.omp_data_i=0x0) at omp_hello.c:26
26	  tid = omp_get_thread_num();
(gdb) 

which seems to be correct.  There is a bit problem it stops earlier if you have
installed gcc-debuginfo:

(gdb) start
Temporary breakpoint 1 at 0x4006a3: file omp_hello.c, line 22.
Starting program: /home/jkratoch/t/omp_hello 
[Thread debugging using libthread_db enabled]

Temporary breakpoint 1, main (argc=1, argv=0x7fffffffded8) at omp_hello.c:22
22	#pragma omp parallel private(nthreads, tid)
(gdb) step
GOMP_parallel_start (fn=0x4006c8 <main.omp_fn.0>, data=0x0, num_threads=0) at
../../../libgomp/parallel.c:106
106	{
(gdb) _

But that happens even with all the system libraries.

I cannot reproduce the "Cannot find bounds of current function" case.


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           What    |Removed                     |Added
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             Status|UNCONFIRMED                 |WAITING


http://sourceware.org/bugzilla/show_bug.cgi?id=11964

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