http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55325
--- Comment #4 from Ed Smith-Rowland <3dw4rd at verizon dot net> 2012-11-14 20:20:27 UTC --- OK, g++.dg/cpp0x/constexpr-complex.C will fail with the patch to control GNU literal parsing. i.e. this behavior in intended. The purpose of the test is to check that constexpr works with C99 complex literals. So we could fix the test in either one of two equivalent ways: Invoke with gnu++0x: // { dg-options -std=gnu++0x } Invoke with new flag: // { dg-options -std=c++0x -fext-numeric-literals } Any preference on which one? I'll look at the other fails.