Suppress debug stepping into auto-loaded library code.

* debug.c (debug_set_state, debug_restore_state): New functions.

* debug.h (debug_state_t): New type.
(debug_set_state, debug_restore_state): Declared, and defined
as dummy macros in non-debug-support build.

* lisplib.c (opt_dbg_autoload): New global variable.
(lisplib_try_load): Disable or enable debugging around
library loading based on opt_dbg_autoload option.

* lisplib.h (opt_dbg_autoload): Declared.

* txr.c (help): List --debug-autoload option.
(no_dbg_support): New static function to avoid repeated code.
(txr_main): Add debugger option. Change duplicate no debug support
error messages into calls to no_dbg_support.

* txr.1: Document --debug-autoload

1 files changed, 1 insertions, 1 deletions

diff --git a/lisplib.h b/lisplib.h
index 1e5ce485..e12d4641 100644
--- a/lisplib.h
+++ b/lisplib.h
@@ -25,7 +25,7 @@
  */
 
 extern val dl_table;
-
+extern int opt_dbg_autoload;
 void lisplib_init(void);
 val lisplib_try_load(val sym);
 void set_dlt_entries(val dlt, val *name, val fun);