[Bug c++/26988] template constructor in template class derived from virtual base can not be specialized

[bangerth at dealii dot org]

------- Comment #2 from bangerth at dealii dot org  2006-04-18 03:45 -------
Confirmed, though this doesn't seem to have anything to do with PR 9050.

Here's a shorter testcase:
--------------
struct B{};

struct Bar : virtual B {               
    template <typename T> Bar( T const& cast );
};

template <> Bar::Bar( int const & cast ) {}

template <typename T>
struct Foo : virtual B {               
    template <typename T1> Foo( T1 const& cast );
};

template< > template< >
Foo< char >::Foo( int const & cast ) {}
---------------------

g/x> /home/bangerth/bin/gcc-4.1-pre/bin/c++ -c x.cc
x.cc:7: error: template-id &#8216;Bar<>&#8217; for &#8216;Bar::Bar(const
int&)&#8217; does not match any template declaration
x.cc:7: error: invalid function declaration
x.cc:15: error: template-id &#8216;Foo<>&#8217; for &#8216;Foo<char>::Foo(const
int&)&#8217; does not match any template declaration
x.cc:15: error: invalid function declaration

The thing that makes me think that this has nothing to do with 9050 is that
if the inheritance is made non-virtual, then the bug goes away. That's 
certainly odd behavior -- this is a bug in semantic analysis, not in the 
parser!

This used to work in 2.95, so is a regression of rejects-valid kind.

W.


-- 

bangerth at dealii dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bangerth at dealii dot org
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
           Keywords|                            |rejects-valid
      Known to fail|                            |3.3.5 3.4.4 4.0.1 4.1.0
      Known to work|                            |2.95
           Priority|P3                          |P2
   Last reconfirmed|0000-00-00 00:00:00         |2006-04-18 03:45:10
               date|                            |
   Target Milestone|---                         |4.1.1


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26988