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Evaluation
----------

   The linker uses "lazy evaluation" for expressions; it only calculates
an expression when absolutely necessary.  The linker needs the value of
the start address, and the lengths of memory regions, in order to do any
linking at all; these values are computed as soon as possible when the
linker reads in the command file.  However, other values (such as symbol
values) are not known or needed until after storage allocation.  Such
values are evaluated later, when other information (such as the sizes of
output sections) is available for use in the symbol assignment
expression.