re PR c++/87324 (g++ ICE with overriding initializers: Segmentation fault)

/cp
2018-09-19  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/87324
	* parser.c (cp_parser_initializer_list): Assign error_mark_node
	to the index upon error.

/testsuite
2018-09-19  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/87324
	* g++.dg/cpp0x/desig5.C: New.

From-SVN: r264428

gcc/cp/ChangeLog

+2018-09-19  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/87324
+	* parser.c (cp_parser_initializer_list): Assign error_mark_node
+	to the index upon error.
+
 2018-09-19  Marek Polacek  <polacek@redhat.com>
 
 	PR c++/87357 - missing -Wconversion warning

gcc/cp/parser.c

@@ -22394,7 +22394,7 @@ cp_parser_initializer_list (cp_parser* parser, bool* non_constant_p)
 			  "%<.%s%> designator used multiple times in "
 			  "the same initializer list",
 			  IDENTIFIER_POINTER (designator));
-		(*v)[i].index = NULL_TREE;
+		(*v)[i].index = error_mark_node;
 	      }
 	    else
 	      IDENTIFIER_MARKED (designator) = 1;

gcc/testsuite/ChangeLog

+2018-09-19  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/87324
+	* g++.dg/cpp0x/desig5.C: New.
+
 2018-09-19  Paul Thomas  <pault@gcc.gnu.org>
 
 	PR fortran/84109

gcc/testsuite/g++.dg/cpp0x/desig5.C

+// PR c++/87324
+// { dg-do compile { target c++11 } }
+// { dg-options "-Wno-pedantic" }
+
+struct {
+  struct {
+    double a;
+    struct {
+      short b;
+    };
+  };
+  int c;
+} d{.a = 7, .a = 8.09};  // { dg-error "designator used multiple times in the same initializer list" }