Support weak semantics in symbol packages.

A package is weak if it holds weak references to symbols,
meaning that if there are no references to a symbol other than
its entry in a weak package, it can be removed from the
package and reclaimed by the garbage collector.

* eval.c (eval_init): Update registrations for make-package
and sys:make-anon-package to reflect new optional argument.

* lib.c (make_package_common): New argument weak. If it is
true then both the hashes will have weak values.
(make_package, make_anon_package): New optional argument weak.
(obj_init): Add nil argument to calls to make_package. All the
standard packages are regular, not weak.

* lib.h (make_package, make_anon_package): Declarations
updated.

* txr.1: Documented.

0 files changed, 0 insertions, 0 deletions