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This file is part of Logtalk
Copyright 1998-2019 Paulo Moura

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.


By default, debug and debug(Group) messages are only printed when the debug flag is turned on. These messages are also suppressed when compiling code with the optimize flag turned on. This tool supports selective enabling of debug and debug(Group) messages in normal and debug modes.

API documentation

To consult this tool API documentation, open in a web browser the link:


For general information on debugging, open in a web browser the following file and consult the debugging section of the User Manual:



This tool can be loaded using the query:

| ?- logtalk_load(debug_messages(loader)).


The tool provides two sets of predicates. The first set allows enabling and disabling of all debug and debug(Group) messages for a given component. The second set allows enabling and disabling of debug(Group) messages for a given group and component.

Upon loading the tool, all debug messages are skipped. The user is then expected to use the tool API to selectively enable the messages that will be printed.

Other notes

All source files are formatted using tabs (the recommended setting is a tab width equivalent to 4 spaces).