re PR debug/85252 (ICE with -g for static zero-length array initialization)

	PR debug/85252
	* dwarf2out.c (rtl_for_decl_init): For STRING_CST initializer only
	build CONST_STRING if TYPE_MAX_VALUE is non-NULL and is INTEGER_CST.

	* gcc.dg/debug/pr85252.c: New test.

From-SVN: r259183

gcc/ChangeLog

 2018-04-06  Jakub Jelinek  <jakub@redhat.com>
 
+	PR debug/85252
+	* dwarf2out.c (rtl_for_decl_init): For STRING_CST initializer only
+	build CONST_STRING if TYPE_MAX_VALUE is non-NULL and is INTEGER_CST.
+
 	PR rtl-optimization/84872
 	* cfgloopmanip.c (create_preheader): Use make_forwarder_block even if
 	nentry == 1 when CP_FALLTHRU_PREHEADERS and single_entry is

gcc/dwarf2out.c

@@ -19596,6 +19596,8 @@ rtl_for_decl_init (tree init, tree type)
       if (is_int_mode (TYPE_MODE (enttype), &mode)
 	  && GET_MODE_SIZE (mode) == 1
 	  && domain
+	  && TYPE_MAX_VALUE (domain)
+	  && TREE_CODE (TYPE_MAX_VALUE (domain)) == INTEGER_CST
 	  && integer_zerop (TYPE_MIN_VALUE (domain))
 	  && compare_tree_int (TYPE_MAX_VALUE (domain),
 			       TREE_STRING_LENGTH (init) - 1) == 0

gcc/testsuite/ChangeLog

 2018-04-06  Jakub Jelinek  <jakub@redhat.com>
 
+	PR debug/85252
+	* gcc.dg/debug/pr85252.c: New test.
+
 	PR rtl-optimization/84872
 	* gcc.dg/graphite/pr84872.c: New test.
 

gcc/testsuite/gcc.dg/debug/pr85252.c

+/* PR debug/85252 */
+/* { dg-do compile } */
+
+void
+foo (void)
+{
+  static char a[0] = "";
+  static char b[0] = "b";	/* { dg-warning "initializer-string for array of chars is too long" } */
+  static char c[1] = "c";
+  static char d[1] = "de";	/* { dg-warning "initializer-string for array of chars is too long" } */
+}