g++ -v
Using built-in specs.
Target: x86_64-unknown-linux-gnu
Configured with: ../configure --enable-threads=posix --prefix=/prj/dsp/qdsp6_aus/users/slarin/x86_gcc_4.4/bin --enable-languages=c,c++ --disable-checking
Thread model: posix
gcc version 4.4.0 (GCC)

Accepts the following code:

class X {
public:
	enum enumX { a=100 };
};

int main(void)
{
	X x;

	(void) &x.a;	// should not compile
}

It should not. This version:

gcc -v
Reading specs from /usr/***specs
Configured with: ../configure --enable-threads=posix --prefix=/usr --with-local-prefix=/usr/local --infodir=/usr/share/info --mandir=/usr/share/man --enable-languages=c,c++,f77,objc,java,ada --disable-checking --libdir=/usr/lib64 --enable-libgcj --with-gxx-include-dir=/usr/include/g++ --with-slibdir=/lib64 --with-system-zlib --enable-shared --enable-__cxa_atexit x86_64-suse-linux
Thread model: posix
gcc version 3.3.3 (SuSE Linux)

Correctly produces the following error:

fe1.cc: In function `int main()':
fe1.cc:12: error: non-lvalue in unary `&'