[Bug c++/39906] New: Accepted invalid member template specialization in derived class

[Bug c++/39906] New: Accepted invalid member template specialization in derived class

[sutambe at yahoo dot com]

struct Base  
{
    template <class T>
    struct Kind 
    {
        typedef T type;
    };
};
struct Derived : public Base { };

template <>
struct Derived::Kind<char> // Should fail to compile here
{
    typedef int type;
};

int main(void) { }

I believe the above code should be rejected but gcc 4.1.2 accepted it. Global
scope explicit member template specialization of the inner struct Kind is shown
to be in the Derived class. (It is rejected by Comeau). gcc correctly rejects
in the case of member template functions but not in case of structs/classes.

Compiler information:
Using built-in specs.
Target: i386-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --enable-shared --enable-threads=posix
--enable-checking=release --with-system-zlib --enable-__cxa_atexit
--disable-libunwind-exceptions
--enable-languages=c,c++,objc,obj-c++,java,fortran,ada --enable-java-awt=gtk
--disable-dssi --enable-plugin
--with-java-home=/usr/lib/jvm/java-1.5.0-gcj-1.5.0.0/jre
--enable-libgcj-multifile --enable-java-maintainer-mode
--with-ecj-jar=/usr/share/java/eclipse-ecj.jar --with-cpu=generic
--host=i386-redhat-linux
Thread model: posix
gcc version 4.1.2 20070925 (Red Hat 4.1.2-33)


-- 
           Summary: Accepted invalid member template specialization in
                    derived class
           Product: gcc
           Version: 4.1.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: sutambe at yahoo dot com
 GCC build triplet: i386-redhat-linux
  GCC host triplet: i386-redhat-linux
GCC target triplet: i386-redhat-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39906

[Bug c++/39906] Accepted invalid member template specialization in derived class

[rguenth at gcc dot gnu dot org]

------- Comment #1 from rguenth at gcc dot gnu dot org  2009-04-26 16:52 -------
Confirmed.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
           Keywords|                            |accepts-invalid
      Known to fail|                            |4.5.0
   Last reconfirmed|0000-00-00 00:00:00         |2009-04-26 16:52:02
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39906

[Bug c++/39906] Accepted invalid member template specialization in derived class

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=39906

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Even more shocking this works on all compilers:
int t1;
Derived::Kind<char>::type &t = t1;
Base::Kind<char>::type &t2 = t1;