re PR c/16409 (ICE in size_binop, at fold-const.c)

	PR c/16409
	* c-decl.c (start_decl): Check for initializing incomplete array
	of VLAs.
	(build_compound_literal): Check for TYPE being error_mark_node.
	* c-parse.in (primary): Check for VLA compound literals.

testsuite:
	* gcc.dg/vla-init-2.c, gcc.dg/vla-init-3.c, gcc.dg/vla-init-4.c,
	gcc.dg/vla-init-5.c: New tests.

From-SVN: r88248

1 files changed, 15 insertions, 1 deletions

diff --git a/gcc/c-decl.c b/gcc/c-decl.c
index 3a2f576..4137876 100644
--- a/gcc/c-decl.c
+++ b/gcc/c-decl.c
@@ -2986,6 +2986,15 @@ start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
 	    error ("elements of array %qD have incomplete type", decl);
 	    initialized = 0;
 	  }
+	else if (C_DECL_VARIABLE_SIZE (decl))
+	  {
+	    /* Although C99 is unclear about whether incomplete arrays
+	       of VLAs themselves count as VLAs, it does not make
+	       sense to permit them to be initialized given that
+	       ordinary VLAs may not be initialized.  */
+	    error ("variable-sized object may not be initialized");
+	    initialized = 0;
+	  }
       }
 
   if (initialized)
@@ -3416,9 +3425,14 @@ build_compound_literal (tree type, tree init)
   /* We do not use start_decl here because we have a type, not a declarator;
      and do not use finish_decl because the decl should be stored inside
      the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR.  */
-  tree decl = build_decl (VAR_DECL, NULL_TREE, type);
+  tree decl;
   tree complit;
   tree stmt;
+
+  if (type == error_mark_node)
+    return error_mark_node;
+
+  decl = build_decl (VAR_DECL, NULL_TREE, type);
   DECL_EXTERNAL (decl) = 0;
   TREE_PUBLIC (decl) = 0;
   TREE_STATIC (decl) = (current_scope == file_scope);