re PR c++/84596 (internal compiler error: unexpected expression '(bool)c' of…

re PR c++/84596 (internal compiler error: unexpected expression '(bool)c' of kind implicit_conv_expr (cxx_eval_constant_expression))

	PR c++/84596
	* constexpr.c (require_rvalue_constant_expression): New function.
	* cp-tree.h: Declare it.
	* semantics.c (finish_static_assert): Use it instead of
	require_potential_rvalue_constant_expression.

	* g++.dg/cpp0x/static_assert14.C: New test.

From-SVN: r258107

gcc/cp/ChangeLog

+2018-03-01  Marek Polacek  <polacek@redhat.com>
+
+	PR c++/84596
+	* constexpr.c (require_rvalue_constant_expression): New function.
+	* cp-tree.h: Declare it.
+	* semantics.c (finish_static_assert): Use it instead of
+	require_potential_rvalue_constant_expression.
+
 2018-03-01  Jason Merrill  <jason@redhat.com>
 	    Alexandre Oliva <aoliva@redhat.com>
 

gcc/cp/constexpr.c

@@ -6047,7 +6047,8 @@ potential_rvalue_constant_expression (tree t)
 bool
 require_potential_constant_expression (tree t)
 {
-  return potential_constant_expression_1 (t, false, true, false, tf_warning_or_error);
+  return potential_constant_expression_1 (t, false, true, false,
+					  tf_warning_or_error);
 }
 
 /* Cross product of the above.  */
@@ -6055,7 +6056,17 @@ require_potential_constant_expression (tree t)
 bool
 require_potential_rvalue_constant_expression (tree t)
 {
-  return potential_constant_expression_1 (t, true, true, false, tf_warning_or_error);
+  return potential_constant_expression_1 (t, true, true, false,
+					  tf_warning_or_error);
+}
+
+/* Like above, but don't consider PARM_DECL a potential_constant_expression.  */
+
+bool
+require_rvalue_constant_expression (tree t)
+{
+  return potential_constant_expression_1 (t, true, true, true,
+					  tf_warning_or_error);
 }
 
 /* Like potential_constant_expression, but don't consider possible constexpr

gcc/cp/cp-tree.h

@@ -7409,6 +7409,7 @@ extern bool is_static_init_expression    (tree);
 extern bool potential_rvalue_constant_expression (tree);
 extern bool require_potential_constant_expression (tree);
 extern bool require_constant_expression (tree);
+extern bool require_rvalue_constant_expression (tree);
 extern bool require_potential_rvalue_constant_expression (tree);
 extern tree cxx_constant_value			(tree, tree = NULL_TREE);
 extern tree cxx_constant_init			(tree, tree = NULL_TREE);

gcc/cp/semantics.c

@@ -8671,7 +8671,7 @@ finish_static_assert (tree condition, tree message, location_t location,
       else if (condition && condition != error_mark_node)
 	{
 	  error ("non-constant condition for static assertion");
-	  if (require_potential_rvalue_constant_expression (condition))
+	  if (require_rvalue_constant_expression (condition))
 	    cxx_constant_value (condition);
 	}
       input_location = saved_loc;

gcc/testsuite/ChangeLog

+2018-03-01  Marek Polacek  <polacek@redhat.com>
+
+	PR c++/84596
+	* g++.dg/cpp0x/static_assert14.C: New test.
+
 2018-03-01  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/79410

gcc/testsuite/g++.dg/cpp0x/static_assert14.C

+// PR c++/84596
+// { dg-do compile { target c++11 } }
+
+template<int x>
+void b(int c) {
+  static_assert (c, "c"); // { dg-error "non-constant|not a constant" }
+}