PR c++/69523 make -Wliteral-suffix control warning

gcc:

	PR c++/69523
	* doc/invoke.texi (C++ Dialect Options) [-Wliteral-suffix]: Update
	description.

gcc/cp:

2017-02-19  Eric Fiselier  <eric@efcs.ca>
	    Jonathan Wakely  <jwakely@redhat.com>

	PR c++/69523
	* parser.c (cp_parser_unqualified_id): Use OPT_Wliteral_suffix to
	control warning about literal suffix identifiers without a leading
	underscore.

gcc/testsuite:

2017-02-19  Eric Fiselier  <eric@efcs.ca>
	    Jonathan Wakely  <jwakely@redhat.com>

	PR c++/69523
	* g++.dg/cpp0x/Wliteral-suffix2.C: New test.

From-SVN: r245574

gcc/ChangeLog

+2017-02-19  Jonathan Wakely  <jwakely@redhat.com>
+
+	PR c++/69523
+	* doc/invoke.texi (C++ Dialect Options) [-Wliteral-suffix]: Update
+	description.
+
 2017-02-19  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>
 
 	* gimple-pretty-print.c (dump_ternary_rhs): Adjust gimple dump format

gcc/cp/ChangeLog

+2017-02-19  Eric Fiselier  <eric@efcs.ca>
+	    Jonathan Wakely  <jwakely@redhat.com>
+
+	PR c++/69523
+	* parser.c (cp_parser_unqualified_id): Use OPT_Wliteral_suffix to
+	control warning about literal suffix identifiers without a leading
+	underscore.
+
 2017-02-17  Jason Merrill  <jason@redhat.com>
 
 	PR c++/79508 - lookup error with member template

gcc/cp/parser.c

@@ -5812,8 +5812,9 @@ cp_parser_unqualified_id (cp_parser* parser,
 	      const char *name = UDLIT_OP_SUFFIX (id);
 	      if (name[0] != '_' && !in_system_header_at (input_location)
 		  && declarator_p)
-		warning (0, "literal operator suffixes not preceded by %<_%>"
-			    " are reserved for future standardization");
+		warning (OPT_Wliteral_suffix,
+			 "literal operator suffixes not preceded by %<_%>"
+			 " are reserved for future standardization");
 	    }
 
 	  return id;

gcc/doc/invoke.texi

@@ -2852,6 +2852,11 @@ int main() @{
 
 In this case, @code{PRId64} is treated as a separate preprocessing token.
 
+Additionally, warn when a user-defined literal operator is declared with
+a literal suffix identifier that doesn't begin with an underscore. Literal
+suffix identifiers that don't begin with an underscore are reserved for
+future standardization.
+
 This warning is enabled by default.
 
 @item -Wlto-type-mismatch

gcc/testsuite/ChangeLog

+2017-02-19  Eric Fiselier  <eric@efcs.ca>
+	    Jonathan Wakely  <jwakely@redhat.com>
+
+	PR c++/69523
+	* g++.dg/cpp0x/Wliteral-suffix2.C: New test.
+
 2017-02-19  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>
 
 	* gcc.dg/gimplefe-26.c: New test.

gcc/testsuite/g++.dg/cpp0x/Wliteral-suffix2.C

+// { dg-do compile { target c++11 } }
+// { dg-options "-Wno-literal-suffix" }
+
+// Test user-defined literals.
+// Test "-Wno-literal-suffix" suppresses warnings on declaration without
+// leading underscore.
+
+long double operator"" nounder(long double); // { dg-bogus "" }
+
+template<char...>
+  int operator"" nounder(); // { dg-bogus "" }