http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54413
Bug #: 54413 Summary: Option for turning off compiler extensions for -std=c++11 with respect to complex/fixed-point numbers missing Classification: Unclassified Product: gcc Version: 4.7.1 Status: UNCONFIRMED Severity: major Priority: P3 Component: c++ AssignedTo: unassig...@gcc.gnu.org ReportedBy: p4s...@hispeed.ch All versions of g++ that support UDL operators should have such an option to turn off GNU complex literals and fixed point literals extensions. I am prototyping C++1x library extensions for user-defined literals. While it is possible to turn off GCC's extensions for complex numbers for "old" C++ it is impossible to combine the effects of -ansi with -std=c++11. Especially the syntax extensions for complex numbers, e.g., 1.1i cannot be turned off and thus do not allow testing of UDL operators for the purpose of creating std::complex<> literals, such as constexpr std::complex<double> operator"" i(long double d){ return std::complex<double>(0,d); } >From the fixed-point extension also number suffixes r and R are occupied. More info at my proposal, http://wiki.hsr.ch/PeterSommerlad/files/N3402_UDLsuffixes.pdf All versions of g++ that support UDL operators should have such an option to turn off GNU complex literals and fixed point literals extensions.