re PR c++/55080 (-pedantic produces error: floating-point literal cannot appear…

re PR c++/55080 (-pedantic produces error: floating-point literal cannot appear in a constant-expression)

/cp
2016-11-17  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/55080
	* parser.c (cp_parser_non_integral_constant_expression): Issue a
	pedwarn instead of an error for case NIC_FLOAT.

/testsuite
2016-11-17  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/55080
	* g++.dg/parse/pr55080.C: New.

From-SVN: r242565

gcc/cp/ChangeLog

+2016-11-17  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/55080
+	* parser.c (cp_parser_non_integral_constant_expression): Issue a
+	pedwarn instead of an error for case NIC_FLOAT.
+
 2016-11-17  Jason Merrill  <jason@redhat.com>
 
 	PR c++/78124 - list-initialization and inherited ctor

gcc/cp/parser.c

@@ -3028,8 +3028,9 @@ cp_parser_non_integral_constant_expression (cp_parser  *parser,
 	  switch (thing)
 	    {
   	      case NIC_FLOAT:
-		error ("floating-point literal "
-		       "cannot appear in a constant-expression");
+		pedwarn (input_location, OPT_Wpedantic,
+			 "ISO C++ forbids using a floating-point literal "
+			 "in a constant-expression");
 		return true;
 	      case NIC_CAST:
 		error ("a cast to a type other than an integral or "

gcc/testsuite/ChangeLog

+2016-11-17  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/55080
+	* g++.dg/parse/pr55080.C: New.
+
 2016-11-17  Michael Meissner  <meissner@linux.vnet.ibm.com>
 
 	PR target/78101

gcc/testsuite/g++.dg/parse/pr55080.C

+// PR c++/55080
+// { dg-options "-std=c++98 -pedantic" }
+
+class B {
+ static const int c = 3.1415926; // { dg-warning "constant-expression" }
+};