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<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
<!-- This material may be distributed only subject to the terms      -->
<!-- and conditions set forth in the Open Publication License, v1.0  -->
<!-- or later (the latest version is presently available at          -->
<!-- http://www.opencontent.org/openpub/).                           -->
<!-- Distribution of the work or derivative of the work in any       -->
<!-- standard (paper) book form is prohibited unless prior           -->
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<HTML
><HEAD
><TITLE
>description</TITLE
><meta name="MSSmartTagsPreventParsing" content="TRUE">
<META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
"><LINK
REL="HOME"
TITLE="The eCos Component Writer's Guide"
HREF="cdl-guide.html"><LINK
REL="UP"
TITLE="CDL Language Specification"
HREF="reference.html"><LINK
REL="PREVIOUS"
TITLE="define_proc"
HREF="ref.define-proc.html"><LINK
REL="NEXT"
TITLE="display"
HREF="ref.display.html"></HEAD
><BODY
CLASS="REFENTRY"
BGCOLOR="#FFFFFF"
TEXT="#000000"
LINK="#0000FF"
VLINK="#840084"
ALINK="#0000FF"
><DIV
CLASS="NAVHEADER"
><TABLE
SUMMARY="Header navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TH
COLSPAN="3"
ALIGN="center"
>The <SPAN
CLASS="APPLICATION"
>eCos</SPAN
> Component Writer's Guide</TH
></TR
><TR
><TD
WIDTH="10%"
ALIGN="left"
VALIGN="bottom"
><A
HREF="ref.define-proc.html"
ACCESSKEY="P"
>Prev</A
></TD
><TD
WIDTH="80%"
ALIGN="center"
VALIGN="bottom"
></TD
><TD
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ALIGN="right"
VALIGN="bottom"
><A
HREF="ref.display.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
></TABLE
><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><H1
><A
NAME="REF.DESCRIPTION"><SPAN
CLASS="PROPERTY"
>description</SPAN
></H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN4219"
></A
><H2
>Name</H2
>Property <SPAN
CLASS="PROPERTY"
>description</SPAN
>&nbsp;--&nbsp;Provide a textual description for an option.</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN4223"><H2
>Synopsis</H2
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="SYNOPSIS"
>cdl_option &lt;name&gt; {
    description &lt;text&gt;
    &#8230;
}</PRE
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN4225"
></A
><H2
>Description</H2
><P
>Users can only be expected to manipulate configuration options
sensibly if they are given sufficient information about these options.
There are three properties which serve to explain an option in plain
text: the <SPAN
CLASS="PROPERTY"
>display</SPAN
> property gives a textual alias for an option,
which is usually more comprehensible than something like
<TT
CLASS="LITERAL"
>CYGPKG_LIBC_TIME_ZONES</TT
>; the <SPAN
CLASS="PROPERTY"
>description</SPAN
> property
gives a longer description, typically a paragraph or so; the <SPAN
CLASS="PROPERTY"
>doc</SPAN
>
property specifies the location of additional on-line documentation
related to a configuration option. In the context of a graphical tool
the <SPAN
CLASS="PROPERTY"
>display</SPAN
> string will be the primary way for users to identify
configuration options; the <SPAN
CLASS="PROPERTY"
>description</SPAN
> paragraph will be visible
whenever the option is selected; the on-line documentation will only
be accessed when the user explicitly requests it.</P
><P
>At present there is no way of providing any sort of formatting mark-up
in a description. It is possible that future versions of the
configuration tools will provide some control over the way the
description text gets rendered.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN4235"
></A
><H2
>Example</H2
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>cdl_option CYGDBG_INFRA_DEBUG_TRACE_MESSAGE {
    display       "Use trace text"
    default_value 1
    description   "
        All trace calls within eCos contain a text message
        which should give some information about the circumstances.
        These text messages will end up being embedded in the
        application image and hence there is a significant penalty
        in terms of image size.
        It is possible to suppress the use of these messages by
        disabling this option.
        This results in smaller code size, but there is less
        human-readable information available in the trace output,
        possibly only filenames and line numbers."
}</PRE
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN4238"
></A
><H2
>See Also</H2
><P
>Properties <A
HREF="ref.display.html"
><SPAN
CLASS="PROPERTY"
>display</SPAN
></A
> and
<A
HREF="ref.doc.html"
><SPAN
CLASS="PROPERTY"
>doc</SPAN
></A
>.</P
></DIV
><DIV
CLASS="NAVFOOTER"
><HR
ALIGN="LEFT"
WIDTH="100%"><TABLE
SUMMARY="Footer navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
><A
HREF="ref.define-proc.html"
ACCESSKEY="P"
>Prev</A
></TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="cdl-guide.html"
ACCESSKEY="H"
>Home</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
><A
HREF="ref.display.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
><SPAN
CLASS="PROPERTY"
>define_proc</SPAN
></TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="reference.html"
ACCESSKEY="U"
>Up</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
><SPAN
CLASS="PROPERTY"
>display</SPAN
></TD
></TR
></TABLE
></DIV
></BODY
></HTML
>

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			`>description</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="define_proc"`
26			`HREF="ref.define-proc.html"><LINK`
27			`REL="NEXT"`
28			`TITLE="display"`
29			`HREF="ref.display.html"></HEAD`
30			`><BODY`
31			`CLASS="REFENTRY"`
32			`BGCOLOR="#FFFFFF"`
33			`TEXT="#000000"`
34			`LINK="#0000FF"`
35			`VLINK="#840084"`
36			`ALINK="#0000FF"`
37			`><DIV`
38			`CLASS="NAVHEADER"`
39			`><TABLE`
40			`SUMMARY="Header navigation table"`
41			`WIDTH="100%"`
42			`BORDER="0"`
43			`CELLPADDING="0"`
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="ref.define-proc.html"`
61			`ACCESSKEY="P"`
62			`>Prev</A`
63			`></TD`
64			`><TD`
65			`WIDTH="80%"`
66			`ALIGN="center"`
67			`VALIGN="bottom"`
68			`></TD`
69			`><TD`
70			`WIDTH="10%"`
71			`ALIGN="right"`
72			`VALIGN="bottom"`
73			`><A`
74			`HREF="ref.display.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.DESCRIPTION"><SPAN`
86			`CLASS="PROPERTY"`
87			`>description</SPAN`
88			`></H1`
89			`><DIV`
90			`CLASS="REFNAMEDIV"`
91			`><A`
92			`NAME="AEN4219"`
93			`></A`
94			`><H2`
95			`>Name</H2`
96			`>Property <SPAN`
97			`CLASS="PROPERTY"`
98			`>description</SPAN`
99			`> -- Provide a textual description for an option.</DIV`
100			`><DIV`
101			`CLASS="REFSYNOPSISDIV"`
102			`><A`
103			`NAME="AEN4223"><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			`description <text>`
115			`…`
116			`}</PRE`
117			`></TD`
118			`></TR`
119			`></TABLE`
120			`></DIV`
121			`><DIV`
122			`CLASS="REFSECT1"`
123			`><A`
124			`NAME="AEN4225"`
125			`></A`
126			`><H2`
127			`>Description</H2`
128			`><P`
129			`>Users can only be expected to manipulate configuration options`
130			`sensibly if they are given sufficient information about these options.`
131			`There are three properties which serve to explain an option in plain`
132			`text: the <SPAN`
133			`CLASS="PROPERTY"`
134			`>display</SPAN`
135			`> property gives a textual alias for an option,`
136			`which is usually more comprehensible than something like`
137			`<TT`
138			`CLASS="LITERAL"`
139			`>CYGPKG_LIBC_TIME_ZONES</TT`
140			`>; the <SPAN`
141			`CLASS="PROPERTY"`
142			`>description</SPAN`
143			`> property`
144			`gives a longer description, typically a paragraph or so; the <SPAN`
145			`CLASS="PROPERTY"`
146			`>doc</SPAN`
147			`>`
148			`property specifies the location of additional on-line documentation`
149			`related to a configuration option. In the context of a graphical tool`
150			`the <SPAN`
151			`CLASS="PROPERTY"`
152			`>display</SPAN`
153			`> string will be the primary way for users to identify`
154			`configuration options; the <SPAN`
155			`CLASS="PROPERTY"`
156			`>description</SPAN`
157			`> paragraph will be visible`
158			`whenever the option is selected; the on-line documentation will only`
159			`be accessed when the user explicitly requests it.</P`
160			`><P`
161			`>At present there is no way of providing any sort of formatting mark-up`
162			`in a description. It is possible that future versions of the`
163			`configuration tools will provide some control over the way the`
164			`description text gets rendered.</P`
165			`></DIV`
166			`><DIV`
167			`CLASS="REFSECT1"`
168			`><A`
169			`NAME="AEN4235"`
170			`></A`
171			`><H2`
172			`>Example</H2`
173			`><TABLE`
174			`BORDER="5"`
175			`BGCOLOR="#E0E0F0"`
176			`WIDTH="70%"`
177			`><TR`
178			`><TD`
179			`><PRE`
180			`CLASS="PROGRAMLISTING"`
181			`>cdl_option CYGDBG_INFRA_DEBUG_TRACE_MESSAGE {`
182			`display "Use trace text"`
183			`default_value 1`
184			`description "`
185			`All trace calls within eCos contain a text message`
186			`which should give some information about the circumstances.`
187			`These text messages will end up being embedded in the`
188			`application image and hence there is a significant penalty`
189			`in terms of image size.`
190			`It is possible to suppress the use of these messages by`
191			`disabling this option.`
192			`This results in smaller code size, but there is less`
193			`human-readable information available in the trace output,`
194			`possibly only filenames and line numbers."`
195			`}</PRE`
196			`></TD`
197			`></TR`
198			`></TABLE`
199			`></DIV`
200			`><DIV`
201			`CLASS="REFSECT1"`
202			`><A`
203			`NAME="AEN4238"`
204			`></A`
205			`><H2`
206			`>See Also</H2`
207			`><P`
208			`>Properties <A`
209			`HREF="ref.display.html"`
210			`><SPAN`
211			`CLASS="PROPERTY"`
212			`>display</SPAN`
213			`></A`
214			`> and`
215			`<A`
216			`HREF="ref.doc.html"`
217			`><SPAN`
218			`CLASS="PROPERTY"`
219			`>doc</SPAN`
220			`></A`
221			`>.</P`
222			`></DIV`
223			`><DIV`
224			`CLASS="NAVFOOTER"`
225			`><HR`
226			`ALIGN="LEFT"`
227			`WIDTH="100%"><TABLE`
228			`SUMMARY="Footer navigation table"`
229			`WIDTH="100%"`
230			`BORDER="0"`
231			`CELLPADDING="0"`
232			`CELLSPACING="0"`
233			`><TR`
234			`><TD`
235			`WIDTH="33%"`
236			`ALIGN="left"`
237			`VALIGN="top"`
238			`><A`
239			`HREF="ref.define-proc.html"`
240			`ACCESSKEY="P"`
241			`>Prev</A`
242			`></TD`
243			`><TD`
244			`WIDTH="34%"`
245			`ALIGN="center"`
246			`VALIGN="top"`
247			`><A`
248			`HREF="cdl-guide.html"`
249			`ACCESSKEY="H"`
250			`>Home</A`
251			`></TD`
252			`><TD`
253			`WIDTH="33%"`
254			`ALIGN="right"`
255			`VALIGN="top"`
256			`><A`
257			`HREF="ref.display.html"`
258			`ACCESSKEY="N"`
259			`>Next</A`
260			`></TD`
261			`></TR`
262			`><TR`
263			`><TD`
264			`WIDTH="33%"`
265			`ALIGN="left"`
266			`VALIGN="top"`
267			`><SPAN`
268			`CLASS="PROPERTY"`
269			`>define_proc</SPAN`
270			`></TD`
271			`><TD`
272			`WIDTH="34%"`
273			`ALIGN="center"`
274			`VALIGN="top"`
275			`><A`
276			`HREF="reference.html"`
277			`ACCESSKEY="U"`
278			`>Up</A`
279			`></TD`
280			`><TD`
281			`WIDTH="33%"`
282			`ALIGN="right"`
283			`VALIGN="top"`
284			`><SPAN`
285			`CLASS="PROPERTY"`
286			`>display</SPAN`
287			`></TD`
288			`></TR`
289			`></TABLE`
290			`></DIV`
291			`></BODY`
292			`></HTML`
293			`>`

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[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [doc/] [html/] [cdl-guide/] [ref.description.html] - Blame information for rev 174