[Bug libstdc++/65392] New: Bad mangled names in Debug Mode assertions

[Bug libstdc++/65392] New: Bad mangled names in Debug Mode assertions

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65392

            Bug ID: 65392
           Summary: Bad mangled names in Debug Mode assertions
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Keywords: diagnostic
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: redi at gcc dot gnu.org

#include <deque>

int main()
{
    std::deque<int> d;
    auto it = d.begin();
    it - 2;
}



/usr/include/c++/4.8.3/debug/safe_iterator.h:378:error: attempt to retreat 
    a past-the-end iterator 2 steps, which falls outside its valid range.

Objects involved in the operation:
iterator @ 0x0x7fff3e6b1930 {
type =
N11__gnu_debug14_Safe_iteratorINSt9__cxx199815_Deque_iteratorIiRiPiEENSt7__debug5dequeIiSaIiEEEEE
(mutable iterator);
  state = past-the-end;
  references sequence with type `NSt7__debug5dequeIiSaIiEEE' @ 0x0x7fff3e6b1930
}
Aborted (core dumped)

The types shown are not valid symbol names and cannot be demangled. They are
missing the _Z prefix.

We should not bother printing out mangled names if users can't demangle them to
get something meaningful. Ideally we should be demangling them automatically.

[Bug libstdc++/65392] Bad mangled names in Debug Mode assertions

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65392

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-03-11
     Ever confirmed|0                           |1

[Bug libstdc++/65392] Bad mangled names in Debug Mode assertions

[fdumont at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65392

François Dumont <fdumont at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |fdumont at gcc dot gnu.org
         Resolution|---                         |FIXED
           Assignee|unassigned at gcc dot gnu.org      |fdumont at gcc dot gnu.org
   Target Milestone|---                         |6.0

--- Comment #1 from François Dumont <fdumont at gcc dot gnu.org> ---
Symbols are now automatically demangle, the issue doesn't appear anymore.
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Subject: [Bug tree-optimization/46032] openmp inhibits loop vectorization
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idF032

--- Comment #11 from vries at gcc dot gnu.org ---
The ipa-pta solution no longer works. In 4.6, we had:
...
  # USE = anything
  # CLB = anything
  GOMP_parallel_startD.1048 (main._omp_fn.0D.1472, &.omp_data_o.1D.1484, 0);
  # USE = anything
  # CLB = anything
  main._omp_fn.0D.1472 (&.omp_data_o.1D.1484);
  # USE = anything
  # CLB = anything
  GOMP_parallel_endD.1049 ();
...

On trunk, we have now:
...
  # USE = anything
  # CLB = anything
  GOMP_parallelD.1345 (main._omp_fn.0D.1844, &.omp_data_o.1D.1856, 0, 0);
...

So there's no longer a path in the call graph from main to main._omp_fn.
Perhaps a dummy body for GOMP_parallel could fix that.