[Bug c++/14999] New: Clang debug info crashes GDB when trying tocollect local variables in a trace

["dblaikie at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=14999

             Bug #: 14999
           Summary: Clang debug info crashes GDB when trying to collect
                    local variables in a trace
           Product: gdb
           Version: 7.5
            Status: NEW
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned@sourceware.org
        ReportedBy: dblaikie@gmail.com
    Classification: Unclassified


Using Clang ToT (I believe this would easily reproduce with the recently
released 3.2 as well, perhaps with older versions too) to compile the following
program:

  int func(int p) {
    int x = p + 3;
    return x;
  }

  int main() { return func(3); }

Then loading that into GDB (7.5) & executing the following:

  trace 3
  actions
  collect x
  end

At the "collect" point (reproduces when using "collect q" instead) GDB has the
following error:

  ../../gdb-7.5.x/gdb/tracepoint.c:665: internal-error: expression has min
height < 0
  A problem internal to GDB has been detected,
  further debugging may prove unreliable.

It'd be nice if GDB didn't fail. Beyond that, there's nothing in Clang's debug
info that seems unreasonable for this, but evidently there's /some/ difference
between GCC 4.7 and Clang's output here because GCC's output works just fine.
Perhaps the location information is broken in some way. (advice on that would
be appreciated, though not required - this bug is merely about the internal
error)

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