gdb

	* parser-defs.h (parser_debug): Declare.
	* parse.c (_initialize_parse): Install "debug parser" set/show
	command.
	(parser_debug): New global.
	(show_parserdebug): New function.
	* c-exp.y (c_parse): Set yydebug.
gdb/testsuite
	* gdb.texinfo (Debugging Output): Document set debug parser and
	show debug parser.

1 files changed, 20 insertions, 0 deletions

diff --git a/gdb/parse.c b/gdb/parse.c
index d5a199b..aabc461 100644
--- a/gdb/parse.c
+++ b/gdb/parse.c
@@ -109,6 +109,18 @@ show_expressiondebug (struct ui_file *file, int from_tty,
   fprintf_filtered (file, _("Expression debugging is %s.\n"), value);
 }
 
+
+/* Non-zero if an expression parser should set yydebug.  */
+int parser_debug;
+
+static void
+show_parserdebug (struct ui_file *file, int from_tty,
+		  struct cmd_list_element *c, const char *value)
+{
+  fprintf_filtered (file, _("Parser debugging is %s.\n"), value);
+}
+
+
 static void free_funcalls (void *ignore);
 
 static int prefixify_expression (struct expression *);
@@ -1377,4 +1389,12 @@ When non-zero, the internal representation of expressions will be printed."),
 			    NULL,
 			    show_expressiondebug,
 			    &setdebuglist, &showdebuglist);
+  add_setshow_boolean_cmd ("parser", class_maintenance,
+			    &parser_debug, _("\
+Set parser debugging."), _("\
+Show parser debugging."), _("\
+When non-zero, expression parser tracing will be enabled."),
+			    NULL,
+			    show_parserdebug,
+			    &setdebuglist, &showdebuglist);
 }