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Subject: [Bug c++/54413] New: Option for turning off compiler extensions for -std=c++11 with respect to complex/fixed-point numbers missing
Date: Thu, 30 Aug 2012 08:19:00 -0000
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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: unassigned@gcc.gnu.org
        ReportedBy: p4spam@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.