Android: undefined reference on std::ostringstream. Why?

bogong

Hello all!
I have this pice of code:

std::ostringstream oStringStream;
oStringStream << std::this_thread::get_id();
std::string oThreadIDString = oStringStream.str();
const char* oThreadID = oThreadIDString.c_str();

It's working perfectly for iOS and MacOS but for Android I have this error:

error: error: undefined reference to 'std::__ndk1::basic_ostream<char, std::__ndk1::char_traits<char> >& std::__ndk1::operator<< <char, std::__ndk1::char_traits<char> >(std::__ndk1::basic_ostream<char, std::__ndk1::char_traits<char> >&, std::__ndk1::__thread_id)'

Why is that? What am I missing?

koahnig

@bogong

That is actually not Qt problem as it looks.

Whatever the return value of get_id() is. Assign it to a variable and output this. My guess is that there is a different declaration which is actually different from standard types, but other compilers are not as "nervous".

bogong

Solution found.

QString oThreadIDString = QString("0x%1");
QString oThreadIDValue = oThreadIDString.arg((long)QThread::currentThread(),0,16);
std::string oThreadIDStdString = oThreadIDValue.toStdString();