[Bug c++/15203] New: GDB can't find static variable declared locally

["sergiodj at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=15203

             Bug #: 15203
           Summary: GDB can't find static variable declared locally
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned@sourceware.org
        ReportedBy: sergiodj@redhat.com
                CC: jan.kratochvil@redhat.com, keiths@redhat.com
    Classification: Unclassified


Consider the following code:

class foo
{
public:
    int bar()
    {
        static int x;
        if (x != 5)
        {
            x = 5;
        }
    }
};

int main()
{
    foo myfoo;
    myfoo.bar();
}

On FSF GDB HEAD, one cannot print the value of "x" by doing:

(gdb) print 'foo::bar()::x'
No symbol "foo::bar()::x" in current context.

This happens because some symbols are marked as BSF_GNU_UNIQUE since
<http://sourceware.org/ml/binutils/2009-06/msg00016.html> was committed.  I
have a patch which fixes it (to be sent later) by ensuring that GDB reads those
symbols.  However, just applying the doesn't entirely fixes the issue, since it
exposes another regression:

(gdb) p 'foo::bar()::x'
../../../../gdb-src/gdb/cp-namespace.c:816: internal-error:
cp_lookup_nested_symbol called on a non-aggregate type.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n) 

This regression happens because of
<http://sourceware.org/git/?p=gdb.git;a=commit;h=677b1bfabd372790dca4dad32fcb05dd77658728>.

I am creating this bug in order to track the regression.  I will send patches
to fix it later.

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