re PR c++/51225 ([c++0x] [4.7 Regression] ICE with invalid template parameter)

/cp
2012-01-18  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/51225
	* typeck2.c (store_init_value): Within a template guard
	cxx_constant_value with require_potential_constant_expression.
	* pt.c (convert_nontype_argument): Likewise.

/testsuite
2012-01-18  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/51225
	* g++.dg/cpp0x/pr51225.C: New.

From-SVN: r183286

gcc/cp/ChangeLog

+2012-01-18  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/51225
+	* typeck2.c (store_init_value): Within a template guard
+	cxx_constant_value with require_potential_constant_expression.
+	* pt.c (convert_nontype_argument): Likewise.
+
 2012-01-16  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c++/51854

gcc/cp/pt.c

@@ -5807,6 +5807,9 @@ convert_nontype_argument (tree type, tree expr, tsubst_flags_t complain)
 	  if (complain & tf_error)
 	    {
 	      int errs = errorcount, warns = warningcount;
+	      if (processing_template_decl
+		  && !require_potential_constant_expression (expr))
+		return NULL_TREE;
 	      expr = cxx_constant_value (expr);
 	      if (errorcount > errs || warningcount > warns)
 		inform (EXPR_LOC_OR_HERE (expr),

gcc/cp/typeck2.c

@@ -718,8 +718,14 @@ store_init_value (tree decl, tree init, VEC(tree,gc)** cleanups, int flags)
       value = fold_non_dependent_expr (value);
       value = maybe_constant_init (value);
       if (DECL_DECLARED_CONSTEXPR_P (decl))
-	/* Diagnose a non-constant initializer for constexpr.  */
-	value = cxx_constant_value (value);
+	{
+	  /* Diagnose a non-constant initializer for constexpr.  */
+	  if (processing_template_decl
+	      && !require_potential_constant_expression (value))
+	    value = error_mark_node;
+	  else
+	    value = cxx_constant_value (value);
+	}
       const_init = (reduced_constant_expression_p (value)
 		    || error_operand_p (value));
       DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = const_init;

gcc/testsuite/ChangeLog

+2012-01-18  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/51225
+	* g++.dg/cpp0x/pr51225.C: New.
+
 2012-01-17  Ian Lance Taylor  <iant@google.com>
 
 	PR go/50656

gcc/testsuite/g++.dg/cpp0x/pr51225.C

+// PR c++/51225
+// { dg-options "-std=c++0x" }
+
+template<int> struct A {};
+
+template<typename> void foo()
+{
+  A<int(x)> a; // { dg-error "not declared|invalid type" }
+}
+
+template<typename> struct bar
+{
+  static constexpr A<1> b = A<1>(x); // { dg-error "not declared" }
+};