[Bug middle-end/37500] [4.4 Regression] libstdc++ failed to compile at -O0

["pinskia at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #5 from pinskia at gcc dot gnu dot org  2008-09-13 03:52 -------
Here is a reduced testcase for the variadic-tuple.C failure.
Compile with --param ggc-min-expand=0 --param ggc-min-heapsize=0 -w:

namespace std __attribute__ ((__visibility__ ("default"))) {
  template<typename _CharT>     class basic_string;
  typedef basic_string<char> string;
  template<typename _CharT>
  struct basic_string     {
    void  _M_destroy() throw();
    basic_string(const char* __s);
    ~basic_string()       {
      _M_destroy();
    }
  };
  template<typename _CharT>   void basic_string<_CharT>:: _M_destroy() throw ()
    {   }
  extern template class basic_string<char>;
};
template<typename... Values> class tuple;
template<> class tuple<> { };
template<typename Head, typename... Tail> struct tuple<Head, Tail...> : private
tuple<Tail...>  {
  typedef tuple<Tail...> inherited;
  tuple()  {  }
  template<typename... VValues>   tuple(const tuple<VValues...>& other)
    :
    m_head(other.head())
    ,inherited(other.tail())
  {  }
  const Head &head() const {  }
  const inherited& tail() const {  }
  Head m_head;
};
int main() {
  tuple<int, float, const char*> t3a;
  tuple<long, double, std::string> t3b(t3a);
}


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37500