re PR target/85056 ([nvptx] wrong declaration of external arrays)

PR target/85056

	gcc/
	* config/nvptx/nvptx.c (nvptx_assemble_decl_begin): Add '[]' to
	extern array declarations.

	gcc/testsuite/
	* testsuite/gcc.target/nvptx/pr85056.c: New test.
	* testsuite/gcc.target/nvptx/pr85056a.c: New test.

From-SVN: r258885

gcc/ChangeLog

+2018-03-27  Cesar Philippidis  <cesar@codesourcery.com>
+
+	PR target/85056
+	* config/nvptx/nvptx.c (nvptx_assemble_decl_begin): Add '[]' to
+	extern array declarations.
+
 2018-03-27  Richard Biener  <rguenther@suse.de>
 
 	PR middle-ed/84067

gcc/config/nvptx/nvptx.c

@@ -2033,6 +2033,9 @@ static void
 nvptx_assemble_decl_begin (FILE *file, const char *name, const char *section,
 			   const_tree type, HOST_WIDE_INT size, unsigned align)
 {
+  bool atype = (TREE_CODE (type) == ARRAY_TYPE)
+    && (TYPE_DOMAIN (type) == NULL_TREE);
+
   while (TREE_CODE (type) == ARRAY_TYPE)
     type = TREE_TYPE (type);
 
@@ -2072,6 +2075,8 @@ nvptx_assemble_decl_begin (FILE *file, const char *name, const char *section,
     /* We make everything an array, to simplify any initialization
        emission.  */
     fprintf (file, "[" HOST_WIDE_INT_PRINT_DEC "]", init_frag.remaining);
+  else if (atype)
+    fprintf (file, "[]");
 }
 
 /* Called when the initializer for a decl has been completely output through

gcc/testsuite/ChangeLog

+2018-03-27  Cesar Philippidis  <cesar@codesourcery.com>
+
+	PR target/85056
+	* testsuite/gcc.target/nvptx/pr85056.c: New test.
+	* testsuite/gcc.target/nvptx/pr85056a.c: New test.
+
 2018-03-27  Richard Biener  <rguenther@suse.de>
 
 	PR testsuite/82847

gcc/testsuite/gcc.target/nvptx/pr85056.c

+/* { dg-do run } */
+/* { dg-additional-sources "pr85056a.c" } */
+
+extern void abort ();
+
+extern int a[];
+
+int
+main ()
+{
+  int i, sum;
+
+  for (i = 0; i < 10; i++)
+    sum += a[i];
+
+  if (sum != 55)
+    abort ();
+
+  return 0;
+}

gcc/testsuite/gcc.target/nvptx/pr85056a.c

+/* { dg-skip-if "" { *-*-* } } */
+
+int a[10] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };