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C++ PATCH for c++/60628 (auto array)

Message ID 5331C05D.3020903@redhat.com
State New
Headers show

Commit Message

Jason Merrill March 25, 2014, 5:43 p.m. UTC 
We got confused tsubsting the VLA type because tsubst doesn't expect to 
see a SAVE_EXPR.  Simple to fix by enforcing the rule against auto arrays.

Tested x86_64-pc-linux-gnu, applying to trunk.
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Patch

commit f2fbd4a8a0152e2d9d6c0b9d6ccfb1639183ed0c
Author: Jason Merrill <jason@redhat.com>
Date:   Mon Mar 24 14:58:58 2014 -0400

    	PR c++/60628
    	* decl.c (create_array_type_for_decl): Complain about array of auto.

diff --git a/gcc/cp/decl.c b/gcc/cp/decl.c
index c912ffc..f3a081b 100644
--- a/gcc/cp/decl.c
+++ b/gcc/cp/decl.c
@@ -8534,6 +8534,14 @@  create_array_type_for_decl (tree name, tree type, tree size)
       && (flag_iso || warn_vla > 0))
     pedwarn (input_location, OPT_Wvla, "array of array of runtime bound");
 
+  /* 8.3.4p1: ...if the type of the identifier of D contains the auto
+     type-specifier, the program is ill-formed.  */
+  if (type_uses_auto (type))
+    {
+      error ("%qD declared as array of %qT", name, type);
+      return error_mark_node;
+    }
+
   /* Figure out the index type for the array.  */
   if (size)
     itype = compute_array_index_type (name, size, tf_warning_or_error);
diff --git a/gcc/testsuite/g++.dg/cpp0x/auto42.C b/gcc/testsuite/g++.dg/cpp0x/auto42.C
new file mode 100644
index 0000000..fea4c28
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/auto42.C
@@ -0,0 +1,9 @@ 
+// PR c++/60628
+// { dg-do compile { target c++11 } }
+
+#include <initializer_list>
+
+void foo(int i)
+{
+  auto x[1] = { 0 };		// { dg-error "array of .auto" }
+}