The value of *compile-file-pathname*
must always be a pathname or nil
.
The value of *compile-file-truename*
must always be a physical pathname or nil
.
nil
.
During a call to compile-file
,
*compile-file-pathname*
is bound to
the pathname denoted by the first argument to compile-file
,
merged against the defaults;
that is, it is bound to (pathname (merge-pathnames
input-file))
.
During the same time interval,
*compile-file-truename*
is bound to
the truename of the file being compiled.
At other times, the value of these variables is nil
.
If a break loop is entered while compile-file
is ongoing,
it is implementation-dependent whether these variables retain
the values they had just prior to entering the break loop
or whether they are bound to nil
.
The consequences are unspecified if an attempt is made to assign or bind either of these variables.
The file system.