[Bug c++/44753] New: [4.5 Regression] class partial specialization error

[Bug c++/44753] New: [4.5 Regression] class partial specialization error

[rodolfo at rodsoft dot org]

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The following code compiles on gcc-4.2/4.3/4.4 but doesn't on gcc-4.5, with
error: aggregate ‘foo<identity<int>, 0> bar’ has incomplete type and cannot be
defined

template <class T>
struct identity
{
    typedef T type;
};

template <class T, typename T::type A>
struct foo {};

template <class T, T A>
struct foo<identity<T>, A> {};

int main()
{
    foo<identity<int>,0> bar; // error here
}

g++ somehow is messed up because foo is defined, and it should pick the partial
specialization. If we comment the latter, it compiles, picking the main foo
definition.


-- 
           Summary: [4.5 Regression] class partial specialization error
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: rodolfo at rodsoft dot org
 GCC build triplet: x86_64-pc-linux-gnu
  GCC host triplet: x86_64-pc-linux-gnu
GCC target triplet: x86_64-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44753

[Bug c++/44753] [4.5 Regression] class partial specialization error

[pinskia at gcc dot gnu dot org]

------- Comment #1 from pinskia at gcc dot gnu dot org  2010-07-05 01:29 -------
Works on the trunk:
GNU C++ (GCC) version 4.6.0 20100627 (experimental) [trunk revision 161476]
(x86_64-unknown-linux-gnu)
        compiled by GNU C version 4.6.0 20100627 (experimental) [trunk revision
161476], GMP version 4.3.2, MPFR version 2.4.2, MPC version 0.8.1


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|4.2.1 4.3.1 4.4.1           |4.2.1 4.3.1 4.4.1 4.6.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44753

[Bug c++/44753] [4.5 Regression] class partial specialization error

[rguenth at gcc dot gnu dot org]

-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.5.1


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44753

[Bug c++/44753] [4.5 Regression] class partial specialization error

[rguenth at gcc dot gnu dot org]

------- Comment #2 from rguenth at gcc dot gnu dot org  2010-07-22 09:05 -------
Fixed on the branch.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |FIXED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44753