libstdc++-v3 error similar to Gnats PR 248

[David Edelsohn]

	FYI, PR 248 in the GCC Gnats database looks very similar to a
problem affecting v3 on AIX.  The PR is an extremely small testcase which
produces the linker error:

ld: 0711-317 ERROR: Undefined symbol: PropertySet::Value<int> virtual table

Some v3 testcases produce linker errors:

ld: 0711-317 ERROR: Undefined symbol: std::_Ctype<unsigned char> virtual table
ld: 0711-317 ERROR: Undefined symbol: std::_Ctype_nois<unsigned char> virtual table
ld: 0711-317 ERROR: Undefined symbol: std::ctype<unsigned char> virtual table
ld: 0711-317 ERROR: Undefined symbol: std::basic_stringstream<char, std::char_traits<char>, std::allocator<char> >::std::basic_ios<char, std::char_traits<char> > virtual table

so it looks like these are related.

David