/libcpp
2017-10-20  Mukesh Kapoor   <mukesh.kapoor@oracle.com>

	PR c++/80955
	* lex.c (lex_string): An empty string followed by an identifier is
	a valid user-defined literal. Don't issue a warning for this case.

/testsuite
2017-10-20  Mukesh Kapoor   <mukesh.kapoor@oracle.com>

	PR c++/80955
	* g++.dg/cpp0x/udlit-macros.C: New.