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Hi there!!

I'm having the very same problem reported by mjepson:

error: explicit instantiation of 'std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char, _Traits = std::char_traits<char>, _Alloc = std::allocator<char>]' but no definition available

caused by a "cout" call.

the very same project was working smoothly before updating to mountain lion.

ENVIRONMENT: IDE: QtCreator 2.4.1 based on qt 4.7.4 (64 bit) Platform macbook pro 2.2ghz early 2011 with mountain lion (osx 10.8). Xcode version 4.4.1

I installed the command line tools using Xcode. Uninstalled and re-installed the Qt so it automatically found the compilers toolchains but nothing worked.

Curiously, if I add

cout << myString.c_str();

The problem is solved both for compilation and running.

I'd rather find out what's the problem, though.