Index: crx.h
===================================================================
--- crx.h	(revision 144812)
+++ crx.h	(working copy)
@@ -63,8 +63,16 @@
     } while (0)
 
 /* Show we can debug even without a frame pointer.  */
-#define CAN_DEBUG_WITHOUT_FP
+#define CAN_DEBUG_WITHOUT_FP 1
 
+#define DWARF2_FRAME_INFO 1
+
+#define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
+
+/* Generate .file/.loc directives, so that the assembler generates the
+   line table. */
+#define DWARF2_ASM_LINE_DEBUG_INFO 1
+
 /*****************************************************************************/
 /* STORAGE LAYOUT							     */
 /*****************************************************************************/