http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52654
--- Comment #9 from Ed Smith-Rowland <3dw4rd at verizon dot net> 2012-04-05 19:30:41 UTC --- Created attachment 27103 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27103 Patch including testcases - warn and only when necessary on literal overflow. Pass a flag indicating overflow (or underflow) through the preprocessor and lexer down to the C++ parser. Only if a numeric argument literal operator is found do we finally warn. Otherwise block all warnings for over/under-flow of user-defined literals in the preprocessor and lexer. Waiting for a complete regtest.
