[Bug c++/23735] New: Visibility of template base class members

["dreiners at iastate dot edu" <gcc-bugzilla at gcc dot gnu dot org>]

Hi everybody,

I'm running into some unexpected behavior with template base classes:

template <int Q>
struct A
{
   int a;
};

template <int Q>
struct B : public A<Q>
{
    B(void);
};

template <int Q>
B<Q>::B(void)
{
    a = 0;       // This doesn't work
    A<Q>::a = 0; // This does ...
    this->a = 0; // and so does this
}

gcc 3.4.2 says:

> test.cpp: In constructor `B<Q>::B()':
> test.cpp:23: error: `a' undeclared (first use this function)
> test.cpp:23: error: (Each undeclared identifier is reported only once
> for each function it appears in.)

gcc 4.1.0 says:

> test.cpp: In constructor 'B<Q>::B()':
> test.cpp:22: error: 'a' was not declared in this scope

It works fine with VS.Net and Intel compilers. 

This was tested with the following systems:

gcc 3:
Reading specs from /usr/lib/gcc/i386-redhat-linux/3.4.2/specs
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/
usr/share/info --enable-shared --enable-threads=posix --disable-checking --with-
system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-java-
awt=gtk --host=i386-redhat-linux
Thread model: posix
gcc version 3.4.2 20041017 (Red Hat 3.4.2-6.fc3)

gcc 4:
Using built-in specs.
Target: i686-pc-linux-gnu
Configured with: ../gcc/configure --prefix=/opt/gcc-4.0 --with-gcc-version-
trigger=/opt/gcc-4.0/gcc/gcc/version.c --enable-languages=c,c++
Thread model: posix
gcc version 4.1.0 20050727 (experimental)

Thanks for your help!

   Dirk

-- 
           Summary: Visibility of template base class members
           Product: gcc
           Version: 3.4.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: dreiners at iastate dot edu
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23735