Just recently, the GCC 4.6.0 came out along with libquadmath. Unfortunately, GNU has supported Fortran, but not C or C++ (all that is included is a .so). I have not found
Apparently, this seems to have been an installation error on my part.
While the core C/C++ portion of the GCC includes libquadmath.so, the Fortran version supplies libquadmath.a and quadmath.h, which can be included to access the functions.
#include
#include
int main()
{
char* y = new char[1000];
quadmath_snprintf(y, 1000, "%Qf", 1.0q);
std::cout << y << std::endl;
return 0;
}