Improved debugging. Debug nesting depth counter maintained

and used for next/step/finish stepping.

* Makefile (OBJS): debug.o moved to OBJS-y or OBJS-.
(OBJS-y, OBJS-): New variables.
$(PROG): Depends on OBJS-y also.
clean: clean $(OBJS-y).
depend: include $(OBJS-y) in dependency generation.

* configure: Underscores and dashes are interchangeable in
configure variables.
(yaccname_given, yacc_given): Default value is y, not yes.
(debug_support): New config variable.
(CONFIG_DEBUG_SUPPORT): New config.h symbol.

* debug.c (debug_depth): New global variable.
(debug_block_s): New symbol variable.
(next_depth): New static variable.
(debug): Renamed some commands. Introduced separate next, step
and finish.
(debug_init): debug_block_s initialized.

* debug.h (debug_depth, debug_block_s): Declared.
(debug_enter, debug_leave, debug_return): New macros.
(debug_check, debug_init): Conditionally defined based on
if this is a debug build.

* dep.mk: Regenerated.

* eval.c (eval): Instrumented with debug_enter, debug_leave,
debug_return.

* match.c (match_line, v_fun, match_files): Likewise.

* txr.c (txr_main): Bail if -d or --debug used in build
that lacks debug support.

1 files changed, 15 insertions, 1 deletions

diff --git a/txr.c b/txr.c
index 55bf811f..5e18871e 100644
--- a/txr.c
+++ b/txr.c
@@ -304,7 +304,14 @@ int txr_main(int argc, char **argv)
       argv++, argc--;
       continue;
     } else if (!strcmp(*argv, "--debugger")) {
+#if CONFIG_DEBUG_SUPPORT
       opt_debugger = 1;
+#else
+      format(std_error,
+             lit("~a: option ~a requires debug support compiled in\n"),
+             prog_string, string_utf8(*argv), nao);
+      return EXIT_FAILURE;
+#endif
       argv++, argc--;
       continue;
     }
@@ -327,13 +334,20 @@ int txr_main(int argc, char **argv)
           opt_lisp_bindings = 1;
           break;
         case 'd':
+#if CONFIG_DEBUG_SUPPORT
           opt_debugger = 1;
+#else
+          format(std_error,
+                 lit("~a: option ~a requires debug support compiled in\n"),
+                 prog_string, chr(*popt), nao);
+          return EXIT_FAILURE;
+#endif
           break;
         case 'a':
         case 'c':
         case 'D':
           format(std_error, lit("~a: option -~a does not clump\n"),
-                   prog_string, chr(*popt), nao);
+                 prog_string, chr(*popt), nao);
           return EXIT_FAILURE;
         case '-':
           format(std_error, lit("~a: unrecognized long option: --~a\n"),