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ANSI Common Lisp  3 Evaluation and Compilation 3.2 Compilation
3.2.4 Literal Objects in Compiled Files
The functions eval and compile are
required to ensure that literal objects referenced within the resulting
interpreted or compiled code objects are the same as the
corresponding objects in the source code.
compile-file, on the other hand,
must produce a compiled file that, when loaded with
load, constructs the objects defined by the
source code and produces references to them.
In the case of compile-file, objects
constructed by load of the compiled file cannot be spoken
of as being the same as the objects constructed at
compile time, because the compiled file may be loaded into a different
Lisp image than the one in which it was compiled. This section
defines the concept of similarity which relates
objects in the evaluation environment to the
corresponding objects in the run-time environment.
The constraints on literal objects described in this section
apply only to compile-file;
eval and compile do not copy or coalesce constants.
3.2.4.1 Externalizable Objects
3.2.4.2 Similarity of Literal Objects
3.2.4.3 Extensions to Similarity Rules
3.2.4.4 Additional Constraints on Externalizable Objects
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