See section 2.13 . If true the normal consult message will be printed if a library is autoloaded. By default this message is suppressed. Intended to be used for debugging purposes. May be changed.
Value depends on the C-compiler used.
May be set. Determines the behaviour if an undefined procedure is encountered. If fail , the predicates fails silently. This flag is local to each module. Disabling these optimisations can cause the system to run out of memory on programs that behave correctly if debug mode is off.