Package: gcc-3.4
Version: 3.4.0-2
Severity: important
Tags: experimental
Consider this code fragment:
template <class T>
class A
{
protected:
int f;
};
template <class T>
class B: public A<T>
{
public:
B()
{
f = 1; // line 14
}
};
gcc-3.3 has no problem with this, but gcc-3.4 complains as follows:
a.cc: In constructor `B<T>::B()':
a.cc:14: error: `f' undeclared (first use this function)
a.cc:14: error: (Each undeclared identifier is reported only once for each
function it appears in.)
Changing f on line 14 to any of this->f, B<T>::f, or A<T>::f works
around the problem. There is also no problem if either B or A is not
templated.
I am unable to find anything in the C++ specification that indicates
that gcc 3.4's behavior is correct, but it's hard to find things in
the C++ spec! As far as I know, there are no circumstances under
which fully qualifying a name is required when there is only one
candidate in the scope. The fact that A and B are both templated does
not change the fact that "f" is a protected member variable of the
parent class.
I have NOT reported this upstream as the only version of gcc-3.4 that
I've tried is the one in experimental.
This bug is related to bug 245368. If the gcc people agree that this
is a bug, I will merge that bug with this one. (There someone
reported that xerces23 fails to compile with gcc 3.4. The compiler
errors were of this nature.)
Gratuitous comment: it's great to see g++ 3.4 in experimental. It
will be easier for me to test my complex C++ software against it than
ever before. Thanks. :-)
--
Jay Berkenbilt <[EMAIL PROTECTED]>
http://www.ql.org/q/
-- System Information:
Debian Release: testing/unstable
APT prefers unstable
APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: i386 (i686)
Kernel: Linux 2.4.26-1-686-smp
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8
Versions of packages gcc-3.4 depends on:
ii binutils 2.14.90.0.7-6 The GNU assembler, linker and bina
ii cpp-3.4 3.4.0-2 The GNU C preprocessor
ii gcc-3.4-base 3.4.0-2 The GNU Compiler Collection (base
ii libc6 2.3.2.ds1-12 GNU C Library: Shared libraries an
ii libgcc1 1:3.4.0-2 GCC support library
-- no debconf information
