re PR c++/85015 (internal compiler error: tree check: expected class 'type',…

re PR c++/85015 (internal compiler error: tree check: expected class 'type', have 'exceptional' (error_mark) in build_int_cst, at tree.c:1360)

	PR c++/85015
	* decl.c (compute_array_index_type): Set osize to mark_rvalue_use
	result.

	* g++.dg/cpp0x/pr85015.C: New test.

From-SVN: r258822

gcc/cp/ChangeLog

 2018-03-23  Jakub Jelinek  <jakub@redhat.com>
 
+	PR c++/85015
+	* decl.c (compute_array_index_type): Set osize to mark_rvalue_use
+	result.
+
 	PR c++/84942
 	* pt.c (tsubst_copy_and_build) <case FIX_TRUNC_EXPR>: Replace
 	cp_build_unary_op call with gcc_unreachable ().

gcc/cp/decl.c

@@ -9520,7 +9520,7 @@ compute_array_index_type (tree name, tree size, tsubst_flags_t complain)
 
   if (!type_dependent_expression_p (size))
     {
-      size = mark_rvalue_use (size);
+      osize = size = mark_rvalue_use (size);
 
       if (cxx_dialect < cxx11 && TREE_CODE (size) == NOP_EXPR
 	  && TREE_SIDE_EFFECTS (size))

gcc/testsuite/ChangeLog

 2018-03-23  Jakub Jelinek  <jakub@redhat.com>
 
+	PR c++/85015
+	* g++.dg/cpp0x/pr85015.C: New test.
+
 	PR c++/84942
 	* g++.dg/cpp1y/pr84942.C: New test.
 

gcc/testsuite/g++.dg/cpp0x/pr85015.C

+// PR c++/85015
+// { dg-do compile { target c++11 } }
+// { dg-options "" }
+
+void
+foo ()
+{
+  int &&c = v + 1;		// { dg-error "was not declared in this scope" }
+  struct S {			// { dg-message "declared here" "" { target *-*-* } .-1 }
+    void bar () { int a[c]; }	// { dg-error "use of local variable with automatic storage from containing function" }
+  } e;
+}