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<HTML
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>cdl_option</TITLE
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><H1
><A
NAME="REF.CDL-OPTION"><TT
CLASS="LITERAL"
>cdl_option</TT
></H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN2940"
></A
><H2
>Name</H2
>Command <TT
CLASS="LITERAL"
>cdl_option</TT
>&nbsp;--&nbsp;Define a single configuration option</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN2944"><H2
>Synopsis</H2
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="SYNOPSIS"
>cdl_option &lt;name&gt; {
    &#8230;
}</PRE
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN2946"
></A
><H2
>Description</H2
><P
>The option is the basic unit of configurability. Generally each option
corresponds to a single user choice. Typically there is a certain
amount of information associated with an option to assist the user in
manipulating that option, for example a textual description. There
will also be some limits on the possible values that the user can
choose, so an option may be a simple yes-or-no choice or it may be
something more complicated such as an array size or a device name.
Options may have associated constraints, so if that option is enabled
then certain conditions have to satisfied elsewhere in the
configuration. Options usually have direct consequences such as
preprocessor <TT
CLASS="LITERAL"
>#define</TT
> symbols in a configuration
header file.</P
><P
><TT
CLASS="LITERAL"
>cdl_option</TT
> is implemented as a Tcl command that takes two arguments,
a name and a body. The name must be a valid C preprocessor identifier:
a sequence of upper or lower case letters, digits or underscores,
starting with a non-digit character; identifiers beginning with an
underscore should normally be avoided because they may clash with
system packages or with identifiers reserved for use by the compiler.
Within a single configuration, names must be unique. If a
configuration contained two packages which defined the same entity
<TT
CLASS="LITERAL"
>CYGIMP_SOME_OPTION</TT
>, any references to that entity
in a <SPAN
CLASS="PROPERTY"
>requires</SPAN
> property or any other expression
would be ambiguous. It is possible for a given name to be used by two
different packages if those packages should never be loaded into a
single configuration. For example, architectural HAL packages are
allowed to re-use names because a single configuration cannot target
two different architectures. For a recommended naming convention see
<A
HREF="package.contents.html"
>the Section called <I
>Package Contents and Layout</I
> in Chapter 2</A
>.</P
><P
>The second argument to <TT
CLASS="LITERAL"
>cdl_option</TT
> is a body of
properties, typically surrounded by braces so that the Tcl interpreter
treats it as a single argument. This body will be processed by a
recursive invocation of the Tcl interpreter, extended with additional
commands for the various properties that are allowed inside a
<TT
CLASS="LITERAL"
>cdl_option</TT
>. The valid properties are:</P
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><A
HREF="ref.active-if.html"
><SPAN
CLASS="PROPERTY"
>active_if</SPAN
></A
></DT
><DD
><P
>Allow additional control over the active state of this option.</P
></DD
><DT
><A
HREF="ref.calculated.html"
><SPAN
CLASS="PROPERTY"
>calculated</SPAN
></A
></DT
><DD
><P
>The option's value is not directly user-modifiable, it is calculated
using a suitable CDL expression.</P
></DD
><DT
><A
HREF="ref.compile.html"
><SPAN
CLASS="PROPERTY"
>compile</SPAN
></A
></DT
><DD
><P
>List the source files that should be built if this option is active
and enabled.</P
></DD
><DT
><A
HREF="ref.default-value.html"
><SPAN
CLASS="PROPERTY"
>default_value</SPAN
></A
></DT
><DD
><P
>Provide a default value for this option using a CDL expression.</P
></DD
><DT
><A
HREF="ref.define.html"
><SPAN
CLASS="PROPERTY"
>define</SPAN
></A
></DT
><DD
><P
>Specify additional <TT
CLASS="LITERAL"
>#define</TT
> symbols that should go
into the owning package's configuration header file.</P
></DD
><DT
><A
HREF="ref.define-format.html"
><SPAN
CLASS="PROPERTY"
>define_format</SPAN
></A
></DT
><DD
><P
>Control how the option's value will appear in the configuration header
file.</P
></DD
><DT
><A
HREF="ref.define-proc.html"
><SPAN
CLASS="PROPERTY"
>define_proc</SPAN
></A
></DT
><DD
><P
>Use a fragment of Tcl code to output additional data to
configuration header files.</P
></DD
><DT
><A
HREF="ref.description.html"
><SPAN
CLASS="PROPERTY"
>description</SPAN
></A
></DT
><DD
><P
>Provide a textual description for this option.</P
></DD
><DT
><A
HREF="ref.display.html"
><SPAN
CLASS="PROPERTY"
>display</SPAN
></A
></DT
><DD
><P
>Provide a short string describing this option.</P
></DD
><DT
><A
HREF="ref.doc.html"
><SPAN
CLASS="PROPERTY"
>doc</SPAN
></A
></DT
><DD
><P
>The location of on-line documentation for this option.</P
></DD
><DT
><A
HREF="ref.flavor.html"
><SPAN
CLASS="PROPERTY"
>flavor</SPAN
></A
></DT
><DD
><P
>Specify the nature of this option.</P
></DD
><DT
><A
HREF="ref.if-define.html"
><SPAN
CLASS="PROPERTY"
>if_define</SPAN
></A
></DT
><DD
><P
>Output a common preprocessor construct to a configuration header file. </P
></DD
><DT
><A
HREF="ref.implements.html"
><SPAN
CLASS="PROPERTY"
>implements</SPAN
></A
></DT
><DD
><P
>Enabling this option provides one instance of a more general
interface. </P
></DD
><DT
><A
HREF="ref.legal-values.html"
><SPAN
CLASS="PROPERTY"
>legal_values</SPAN
></A
></DT
><DD
><P
>Impose constraints on the possible values for this option.</P
></DD
><DT
><A
HREF="ref.make.html"
><SPAN
CLASS="PROPERTY"
>make</SPAN
></A
></DT
><DD
><P
>An additional custom build step associated with this option, resulting
in a target that should not go directly into a library.</P
></DD
><DT
><A
HREF="ref.make-object.html"
><SPAN
CLASS="PROPERTY"
>make_object</SPAN
></A
></DT
><DD
><P
>An additional custom build step associated with this option, resulting
in an object file that should go into a library.</P
></DD
><DT
><A
HREF="ref.no-define.html"
><SPAN
CLASS="PROPERTY"
>no_define</SPAN
></A
></DT
><DD
><P
>Suppress the normal generation of a preprocessor
<TT
CLASS="LITERAL"
>#define</TT
> symbol in a configuration header file.</P
></DD
><DT
><A
HREF="ref.parent.html"
><SPAN
CLASS="PROPERTY"
>parent</SPAN
></A
></DT
><DD
><P
>Control the location of this option in the configuration hierarchy. </P
></DD
><DT
><A
HREF="ref.requires.html"
><SPAN
CLASS="PROPERTY"
>requires</SPAN
></A
></DT
><DD
><P
>List constraints that the configuration should satisfy if this option is
active and enabled.</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN3075"
></A
><H2
>Example</H2
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>cdl_option CYGDBG_INFRA_DEBUG_PRECONDITIONS {
    display       "Preconditions"
    default_value 1
    description   "
        This option allows individual control of preconditions.
        A precondition is one type of assert, which it is
        useful to control separately from more general asserts.
        The function is CYG_PRECONDITION(condition,msg)."
}</PRE
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN3078"
></A
><H2
>See Also</H2
><P
>Command <A
HREF="ref.cdl-component.html"
><TT
CLASS="LITERAL"
>cdl_component</TT
></A
>,
command <A
HREF="ref.cdl-package.html"
><TT
CLASS="LITERAL"
>cdl_package</TT
></A
>,
command <A
HREF="ref.cdl-interface.html"
><TT
CLASS="LITERAL"
>cdl_interface</TT
></A
>.</P
></DIV
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Line No.	Rev	Author	Line
1	28	unneback	`<!-- Copyright (C) 2003 Red Hat, Inc. -->`
2			`<!-- This material may be distributed only subject to the terms -->`
3			`<!-- and conditions set forth in the Open Publication License, v1.0 -->`
4			`<!-- or later (the latest version is presently available at -->`
5			`<!-- http://www.opencontent.org/openpub/). -->`
6			`<!-- Distribution of the work or derivative of the work in any -->`
7			`<!-- standard (paper) book form is prohibited unless prior -->`
8			`<!-- permission is obtained from the copyright holder. -->`
9			`<HTML`
10			`><HEAD`
11			`><TITLE`
12			`>cdl_option</TITLE`
13			`><meta name="MSSmartTagsPreventParsing" content="TRUE">`
14			`<META`
15			`NAME="GENERATOR"`
16			`CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+`
17			`"><LINK`
18			`REL="HOME"`
19			`TITLE="The eCos Component Writer's Guide"`
20			`HREF="cdl-guide.html"><LINK`
21			`REL="UP"`
22			`TITLE="CDL Language Specification"`
23			`HREF="reference.html"><LINK`
24			`REL="PREVIOUS"`
25			`TITLE="CDL Language Specification"`
26			`HREF="reference.html"><LINK`
27			`REL="NEXT"`
28			`TITLE="cdl_component"`
29			`HREF="ref.cdl-component.html"></HEAD`
30			`><BODY`
31			`CLASS="REFENTRY"`
32			`BGCOLOR="#FFFFFF"`
33			`TEXT="#000000"`
34			`LINK="#0000FF"`
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44			`CELLSPACING="0"`
45			`><TR`
46			`><TH`
47			`COLSPAN="3"`
48			`ALIGN="center"`
49			`>The <SPAN`
50			`CLASS="APPLICATION"`
51			`>eCos</SPAN`
52			`> Component Writer's Guide</TH`
53			`></TR`
54			`><TR`
55			`><TD`
56			`WIDTH="10%"`
57			`ALIGN="left"`
58			`VALIGN="bottom"`
59			`><A`
60			`HREF="reference.html"`
61			`ACCESSKEY="P"`
62			`>Prev</A`
63			`></TD`
64			`><TD`
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66			`ALIGN="center"`
67			`VALIGN="bottom"`
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69			`><TD`
70			`WIDTH="10%"`
71			`ALIGN="right"`
72			`VALIGN="bottom"`
73			`><A`
74			`HREF="ref.cdl-component.html"`
75			`ACCESSKEY="N"`
76			`>Next</A`
77			`></TD`
78			`></TR`
79			`></TABLE`
80			`><HR`
81			`ALIGN="LEFT"`
82			`WIDTH="100%"></DIV`
83			`><H1`
84			`><A`
85			`NAME="REF.CDL-OPTION"><TT`
86			`CLASS="LITERAL"`
87			`>cdl_option</TT`
88			`></H1`
89			`><DIV`
90			`CLASS="REFNAMEDIV"`
91			`><A`
92			`NAME="AEN2940"`
93			`></A`
94			`><H2`
95			`>Name</H2`
96			`>Command <TT`
97			`CLASS="LITERAL"`
98			`>cdl_option</TT`
99			`> -- Define a single configuration option</DIV`
100			`><DIV`
101			`CLASS="REFSYNOPSISDIV"`
102			`><A`
103			`NAME="AEN2944"><H2`
104			`>Synopsis</H2`
105			`><TABLE`
106			`BORDER="5"`
107			`BGCOLOR="#E0E0F0"`
108			`WIDTH="70%"`
109			`><TR`
110			`><TD`
111			`><PRE`
112			`CLASS="SYNOPSIS"`
113			`>cdl_option <name> {`
114			`…`
115			`}</PRE`
116			`></TD`
117			`></TR`
118			`></TABLE`
119			`></DIV`
120			`><DIV`
121			`CLASS="REFSECT1"`
122			`><A`
123			`NAME="AEN2946"`
124			`></A`
125			`><H2`
126			`>Description</H2`
127			`><P`
128			`>The option is the basic unit of configurability. Generally each option`
129			`corresponds to a single user choice. Typically there is a certain`
130			`amount of information associated with an option to assist the user in`
131			`manipulating that option, for example a textual description. There`
132			`will also be some limits on the possible values that the user can`
133			`choose, so an option may be a simple yes-or-no choice or it may be`
134			`something more complicated such as an array size or a device name.`
135			`Options may have associated constraints, so if that option is enabled`
136			`then certain conditions have to satisfied elsewhere in the`
137			`configuration. Options usually have direct consequences such as`
138			`preprocessor <TT`
139			`CLASS="LITERAL"`
140			`>#define</TT`
141			`> symbols in a configuration`
142			`header file.</P`
143			`><P`
144			`><TT`
145			`CLASS="LITERAL"`
146			`>cdl_option</TT`
147			`> is implemented as a Tcl command that takes two arguments,`
148			`a name and a body. The name must be a valid C preprocessor identifier:`
149			`a sequence of upper or lower case letters, digits or underscores,`
150			`starting with a non-digit character; identifiers beginning with an`
151			`underscore should normally be avoided because they may clash with`
152			`system packages or with identifiers reserved for use by the compiler.`
153			`Within a single configuration, names must be unique. If a`
154			`configuration contained two packages which defined the same entity`
155			`<TT`
156			`CLASS="LITERAL"`
157			`>CYGIMP_SOME_OPTION</TT`
158			`>, any references to that entity`
159			`in a <SPAN`
160			`CLASS="PROPERTY"`
161			`>requires</SPAN`
162			`> property or any other expression`
163			`would be ambiguous. It is possible for a given name to be used by two`
164			`different packages if those packages should never be loaded into a`
165			`single configuration. For example, architectural HAL packages are`
166			`allowed to re-use names because a single configuration cannot target`
167			`two different architectures. For a recommended naming convention see`
168			`<A`
169			`HREF="package.contents.html"`
170			`>the Section called <I`
171			`>Package Contents and Layout</I`
172			`> in Chapter 2</A`
173			`>.</P`
174			`><P`
175			`>The second argument to <TT`
176			`CLASS="LITERAL"`
177			`>cdl_option</TT`
178			`> is a body of`
179			`properties, typically surrounded by braces so that the Tcl interpreter`
180			`treats it as a single argument. This body will be processed by a`
181			`recursive invocation of the Tcl interpreter, extended with additional`
182			`commands for the various properties that are allowed inside a`
183			`<TT`
184			`CLASS="LITERAL"`
185			`>cdl_option</TT`
186			`>. The valid properties are:</P`
187			`><P`
188			`></P`
189			`><DIV`
190			`CLASS="VARIABLELIST"`
191			`><DL`
192			`><DT`
193			`><A`
194			`HREF="ref.active-if.html"`
195			`><SPAN`
196			`CLASS="PROPERTY"`
197			`>active_if</SPAN`
198			`></A`
199			`></DT`
200			`><DD`
201			`><P`
202			`>Allow additional control over the active state of this option.</P`
203			`></DD`
204			`><DT`
205			`><A`
206			`HREF="ref.calculated.html"`
207			`><SPAN`
208			`CLASS="PROPERTY"`
209			`>calculated</SPAN`
210			`></A`
211			`></DT`
212			`><DD`
213			`><P`
214			`>The option's value is not directly user-modifiable, it is calculated`
215			`using a suitable CDL expression.</P`
216			`></DD`
217			`><DT`
218			`><A`
219			`HREF="ref.compile.html"`
220			`><SPAN`
221			`CLASS="PROPERTY"`
222			`>compile</SPAN`
223			`></A`
224			`></DT`
225			`><DD`
226			`><P`
227			`>List the source files that should be built if this option is active`
228			`and enabled.</P`
229			`></DD`
230			`><DT`
231			`><A`
232			`HREF="ref.default-value.html"`
233			`><SPAN`
234			`CLASS="PROPERTY"`
235			`>default_value</SPAN`
236			`></A`
237			`></DT`
238			`><DD`
239			`><P`
240			`>Provide a default value for this option using a CDL expression.</P`
241			`></DD`
242			`><DT`
243			`><A`
244			`HREF="ref.define.html"`
245			`><SPAN`
246			`CLASS="PROPERTY"`
247			`>define</SPAN`
248			`></A`
249			`></DT`
250			`><DD`
251			`><P`
252			`>Specify additional <TT`
253			`CLASS="LITERAL"`
254			`>#define</TT`
255			`> symbols that should go`
256			`into the owning package's configuration header file.</P`
257			`></DD`
258			`><DT`
259			`><A`
260			`HREF="ref.define-format.html"`
261			`><SPAN`
262			`CLASS="PROPERTY"`
263			`>define_format</SPAN`
264			`></A`
265			`></DT`
266			`><DD`
267			`><P`
268			`>Control how the option's value will appear in the configuration header`
269			`file.</P`
270			`></DD`
271			`><DT`
272			`><A`
273			`HREF="ref.define-proc.html"`
274			`><SPAN`
275			`CLASS="PROPERTY"`
276			`>define_proc</SPAN`
277			`></A`
278			`></DT`
279			`><DD`
280			`><P`
281			`>Use a fragment of Tcl code to output additional data to`
282			`configuration header files.</P`
283			`></DD`
284			`><DT`
285			`><A`
286			`HREF="ref.description.html"`
287			`><SPAN`
288			`CLASS="PROPERTY"`
289			`>description</SPAN`
290			`></A`
291			`></DT`
292			`><DD`
293			`><P`
294			`>Provide a textual description for this option.</P`
295			`></DD`
296			`><DT`
297			`><A`
298			`HREF="ref.display.html"`
299			`><SPAN`
300			`CLASS="PROPERTY"`
301			`>display</SPAN`
302			`></A`
303			`></DT`
304			`><DD`
305			`><P`
306			`>Provide a short string describing this option.</P`
307			`></DD`
308			`><DT`
309			`><A`
310			`HREF="ref.doc.html"`
311			`><SPAN`
312			`CLASS="PROPERTY"`
313			`>doc</SPAN`
314			`></A`
315			`></DT`
316			`><DD`
317			`><P`
318			`>The location of on-line documentation for this option.</P`
319			`></DD`
320			`><DT`
321			`><A`
322			`HREF="ref.flavor.html"`
323			`><SPAN`
324			`CLASS="PROPERTY"`
325			`>flavor</SPAN`
326			`></A`
327			`></DT`
328			`><DD`
329			`><P`
330			`>Specify the nature of this option.</P`
331			`></DD`
332			`><DT`
333			`><A`
334			`HREF="ref.if-define.html"`
335			`><SPAN`
336			`CLASS="PROPERTY"`
337			`>if_define</SPAN`
338			`></A`
339			`></DT`
340			`><DD`
341			`><P`
342			`>Output a common preprocessor construct to a configuration header file. </P`
343			`></DD`
344			`><DT`
345			`><A`
346			`HREF="ref.implements.html"`
347			`><SPAN`
348			`CLASS="PROPERTY"`
349			`>implements</SPAN`
350			`></A`
351			`></DT`
352			`><DD`
353			`><P`
354			`>Enabling this option provides one instance of a more general`
355			`interface. </P`
356			`></DD`
357			`><DT`
358			`><A`
359			`HREF="ref.legal-values.html"`
360			`><SPAN`
361			`CLASS="PROPERTY"`
362			`>legal_values</SPAN`
363			`></A`
364			`></DT`
365			`><DD`
366			`><P`
367			`>Impose constraints on the possible values for this option.</P`
368			`></DD`
369			`><DT`
370			`><A`
371			`HREF="ref.make.html"`
372			`><SPAN`
373			`CLASS="PROPERTY"`
374			`>make</SPAN`
375			`></A`
376			`></DT`
377			`><DD`
378			`><P`
379			`>An additional custom build step associated with this option, resulting`
380			`in a target that should not go directly into a library.</P`
381			`></DD`
382			`><DT`
383			`><A`
384			`HREF="ref.make-object.html"`
385			`><SPAN`
386			`CLASS="PROPERTY"`
387			`>make_object</SPAN`
388			`></A`
389			`></DT`
390			`><DD`
391			`><P`
392			`>An additional custom build step associated with this option, resulting`
393			`in an object file that should go into a library.</P`
394			`></DD`
395			`><DT`
396			`><A`
397			`HREF="ref.no-define.html"`
398			`><SPAN`
399			`CLASS="PROPERTY"`
400			`>no_define</SPAN`
401			`></A`
402			`></DT`
403			`><DD`
404			`><P`
405			`>Suppress the normal generation of a preprocessor`
406			`<TT`
407			`CLASS="LITERAL"`
408			`>#define</TT`
409			`> symbol in a configuration header file.</P`
410			`></DD`
411			`><DT`
412			`><A`
413			`HREF="ref.parent.html"`
414			`><SPAN`
415			`CLASS="PROPERTY"`
416			`>parent</SPAN`
417			`></A`
418			`></DT`
419			`><DD`
420			`><P`
421			`>Control the location of this option in the configuration hierarchy. </P`
422			`></DD`
423			`><DT`
424			`><A`
425			`HREF="ref.requires.html"`
426			`><SPAN`
427			`CLASS="PROPERTY"`
428			`>requires</SPAN`
429			`></A`
430			`></DT`
431			`><DD`
432			`><P`
433			`>List constraints that the configuration should satisfy if this option is`
434			`active and enabled.</P`
435			`></DD`
436			`></DL`
437			`></DIV`
438			`></DIV`
439			`><DIV`
440			`CLASS="REFSECT1"`
441			`><A`
442			`NAME="AEN3075"`
443			`></A`
444			`><H2`
445			`>Example</H2`
446			`><TABLE`
447			`BORDER="5"`
448			`BGCOLOR="#E0E0F0"`
449			`WIDTH="70%"`
450			`><TR`
451			`><TD`
452			`><PRE`
453			`CLASS="PROGRAMLISTING"`
454			`>cdl_option CYGDBG_INFRA_DEBUG_PRECONDITIONS {`
455			`display "Preconditions"`
456			`default_value 1`
457			`description "`
458			`This option allows individual control of preconditions.`
459			`A precondition is one type of assert, which it is`
460			`useful to control separately from more general asserts.`
461			`The function is CYG_PRECONDITION(condition,msg)."`
462			`}</PRE`
463			`></TD`
464			`></TR`
465			`></TABLE`
466			`></DIV`
467			`><DIV`
468			`CLASS="REFSECT1"`
469			`><A`
470			`NAME="AEN3078"`
471			`></A`
472			`><H2`
473			`>See Also</H2`
474			`><P`
475			`>Command <A`
476			`HREF="ref.cdl-component.html"`
477			`><TT`
478			`CLASS="LITERAL"`
479			`>cdl_component</TT`
480			`></A`
481			`>,`
482			`command <A`
483			`HREF="ref.cdl-package.html"`
484			`><TT`
485			`CLASS="LITERAL"`
486			`>cdl_package</TT`
487			`></A`
488			`>,`
489			`command <A`
490			`HREF="ref.cdl-interface.html"`
491			`><TT`
492			`CLASS="LITERAL"`
493			`>cdl_interface</TT`
494			`></A`
495			`>.</P`
496			`></DIV`
497			`><DIV`
498			`CLASS="NAVFOOTER"`
499			`><HR`
500			`ALIGN="LEFT"`

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