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From: "tromey at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug c++/15383] New: name lookup and dependent bases
Date: Fri, 19 Apr 2013 18:06:00 -0000
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X-Bugzilla-Product: gdb
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X-Bugzilla-Status: NEW
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http://sourceware.org/bugzilla/show_bug.cgi?id=15383

             Bug #: 15383
           Summary: name lookup and dependent bases
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned@sourceware.org
        ReportedBy: tromey@redhat.com
    Classification: Unclassified


Consider this test case:

int f() { return 23; }

template<typename T>
struct Base {
  int f() { return 13; }
};

template<typename T>
struct Derived : public Base<T> {
  int g() { return f(); }
};

int main()
{
  Derived<int> value;
  return value.g();
}

Here, Derived::g calls ::f, not Base::f.
This is due to a C++ name lookup rule, see:

http://gcc.gnu.org/onlinedocs/gcc/Name-lookup.html
http://gcc.gnu.org/wiki/VerboseDiagnostics#dependent_base

gdb implements this wrongly -- if you stop in g and try to call f,
gdb will try to call Base::f.

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