http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52521
Andy Webber <andy at aligature dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |andy at aligature dot com --- Comment #6 from Andy Webber <andy at aligature dot com> 2012-03-16 19:23:18 UTC --- I've been playing around with a gcc 4.7.0 RC2 build and it seems like the user defined literals might not be working at all now. Building: #include <iostream> #include <cstdlib> constexpr long double operator"" _degrees(long double d) { return d * 0.0175; } int main() { long double pi = 180_degrees; std::cout << pi << std::endl; } Result: literal.cpp: In function ‘int main()’: literal.cpp:11:21: error: unable to find numeric literal operator ‘operator"" _degrees’