An output stream for message reporting. If set to
, then no output will be produced. By default this is
function produces break-on-entry code for all currently undefined but referenced (that is, unresolved) foreign symbols, so that if an undefined foreign function is called from within the foreign code, a Lisp error will occur. Break-on-entry code will also be produced for any new unresolved symbols loaded later in your Lisp session.
The special variable
will, when set to non-nil, produce break-on-entry code for all new unresolved symbols that are loaded, but won't do so for symbols already loaded. By default this variable is set to