Hi Martin,
Any updates on this? I'm having the same problem. Creating a library with something as simple as what's below fails:
#include <string>
class C {
public:
std::string m_string;
};
Note that the library does compile.
I pocked around and found that by updating the Preprocessor Include Paths, the "Unresolved inclusion: <string> error." goes away.

But, I still get a "Type 'std::string' could not be resolved" error and I wasn't able to get any further... bummer.
Looks like something in the "CDT S32 Built-in Compiler Settings" for C++ is off.
Note his piece does work fine on the Kinetis Design Studio.
Thanks,
René
PS: Do you know where I can find a S32DS vs KDS comparison? Trying to figure out which way to head with KEA family chips...