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+#| -*-Scheme-*-
+
+$Id: optiondb.scm,v 1.1 1994/10/03 17:31:32 adams Exp $
+
+Copyright (c) 1994 Massachusetts Institute of Technology
+
+This material was developed by the Scheme project at the Massachusetts
+Institute of Technology, Department of Electrical Engineering and
+Computer Science.  Permission to copy this software, to redistribute
+it, and to use it for any purpose is granted, subject to the following
+restrictions and understandings.
+
+1. Any copy made of this software must include this copyright notice
+in full.
+
+2. Users of this software agree to make their best efforts (a) to
+return to the MIT Scheme project any improvements or extensions that
+they make, so that these may be included in future releases; and (b)
+to inform MIT of noteworthy uses of this software.
+
+3. All materials developed as a consequence of the use of this
+software shall duly acknowledge such use, in accordance with the usual
+standards of acknowledging credit in academic research.
+
+4. MIT has made no warrantee or representation that the operation of
+this software will be error-free, and MIT is under no obligation to
+provide any services, by way of maintenance, update, or otherwise.
+
+5. In conjunction with products arising from the use of this material,
+there shall be no use of the name of the Massachusetts Institute of
+Technology nor of any adaptation thereof in any advertising,
+promotional, or sales literature without prior written consent from
+MIT in each case. |#
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;
+;; This file contains Scheme code to define a set of load options.  Each
+;; time a new (not-yet-loaded) load option is requested, this file is
+;; loaded into a fresh environment which has the system global
+;; environment as parent.
+;;
+;; Procedures used for defining load options:
+;;
+;; (DEFINE-LOAD-OPTION 'NAME loader loader ...)
+;;   Defines a load option (NAME) which is loaded by the execution of its
+;;   loaders.  Loaders are executed left to right.  Loaders are thunks.
+;;
+;; (STANDARD-OPTION-LOADER 'PACKAGE-NAME 'EXPR file file ...)
+;;   Creates a loader that loads the files (strings relative to
+;;   $MITSCHEME_LIBRARY_PATH/options) into the environment of the
+;;   package named PACKAGE-NAME, and then evaluates EXPR in that load
+;;   environment. If EXPR is #F of course evaluating it has no effect.
+;; 
+;; (FURTHER-LOAD-OPTIONS EXPR)
+;;   EXPR is the place to look next for the load options.  Useful objects
+;;   are STANDARD-LOAD-OPTIONS (load options supplied with the
+;;   MIT-Scheme distribution) and LOCAL-LOAD-OPTIONS (load options
+;;   supplied for every user of your architecture at your site).  If
+;;   not specified, or is #F, then this file is the last options
+;;   database that is searched.
+\f
+(declare (usual-integrations))
+
+;; Standard load options are defined like this:
+
+(define-load-option 'ARITHMETIC-INTERFACE
+  (standard-option-loader '(RUNTIME NUMBER INTERFACE) #F "numint"))
+
+;; We can use programming to make the definitions less noisy and tedious:
+
+(for-each
+ (lambda (spec)
+   (define-load-option (car spec) (apply standard-option-loader (cdr spec))))
+ '((FORMAT      (RUNTIME FORMAT)     (INITIALIZE-PACKAGE!) "format")
+   (COMPRESS    (RUNTIME COMPRESS)   #F "cpress")
+   (HASH-TABLE  (RUNTIME HASH-TABLE) (INITIALIZE-PACKAGE!) "hashtb")
+   (RB-TREE     (RUNTIME RB-TREE)    #F "rbtree")
+   (WT-TREE     (RUNTIME WT-TREE)    #F "wttree")
+   (SUBPROCESS  (RUNTIME SUBPROCESS) (INITIALIZE-PACKAGE!) "process")))
+
+(define-load-option 'DOSPROCESS
+  (standard-option-loader '() #F "dosproc"))