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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       -->
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<HTML
><HEAD
><TITLE
>no_define</TITLE
><meta name="MSSmartTagsPreventParsing" content="TRUE">
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CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
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><BODY
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><DIV
CLASS="NAVHEADER"
><TABLE
SUMMARY="Header navigation table"
WIDTH="100%"
BORDER="0"
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><TR
><TH
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ALIGN="center"
>The <SPAN
CLASS="APPLICATION"
>eCos</SPAN
> Component Writer's Guide</TH
></TR
><TR
><TD
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><A
HREF="ref.make-object.html"
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ACCESSKEY="N"
>Next</A
></TD
></TR
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><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><H1
><A
NAME="REF.NO-DEFINE"><SPAN
CLASS="PROPERTY"
>no_define</SPAN
></H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN4836"
></A
><H2
>Name</H2
>Property <SPAN
CLASS="PROPERTY"
>no_define</SPAN
>&nbsp;--&nbsp;Suppress the normal generation of a preprocessor
<TT
CLASS="LITERAL"
>#define</TT
> symbol in a configuration header file.</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN4841"><H2
>Synopsis</H2
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="SYNOPSIS"
>cdl_option &lt;name&gt; {
    no_define
    &#8230;
}</PRE
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN4843"
></A
><H2
>Description</H2
><P
>By default all active and enabled properties result in either one or
two <TT
CLASS="LITERAL"
>#define'd</TT
> symbols in the package's
configuration header file, and this is one of the main ways in which
options can affect packages at build-time. It is possible to suppress
the default <TT
CLASS="LITERAL"
>#define's</TT
> by specifying a
<SPAN
CLASS="PROPERTY"
>no_define</SPAN
> property in the body of an option or other <SPAN
CLASS="APPLICATION"
>CDL</SPAN
> entity.
This property takes no arguments and should occur only once in a given
body. </P
><P
>The <SPAN
CLASS="PROPERTY"
>no_define</SPAN
> property is frequently used in conjunction with one of
the other header-file related properties such as <SPAN
CLASS="PROPERTY"
>define</SPAN
>. If one of
the other properties is used to export the required information to a
configuration header file then often there is little point in
exporting the default <TT
CLASS="LITERAL"
>#define</TT
> as
well&nbsp;&#8212;&nbsp; in fact there could be a name clash. The
<SPAN
CLASS="PROPERTY"
>no_define</SPAN
> property can also be useful if the sole purpose of an
option is to affect which files get built, and the default
<TT
CLASS="LITERAL"
>#define</TT
> would never get tested in any source code.
However in such cases the default <TT
CLASS="LITERAL"
>#define</TT
> is
mostly harmless and there is little to be gained by suppressing it.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN4857"
></A
><H2
>Example</H2
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>cdl_component CYG_HAL_STARTUP {
    display       "Startup type"
    flavor        data
    legal_values  { "RAM" "ROM" }
    default_value {"RAM"}
    no_define
    define -file system.h CYG_HAL_STARTUP
    &#8230;
}</PRE
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN4860"
></A
><H2
>See Also</H2
><P
>Properties <A
HREF="ref.define.html"
><SPAN
CLASS="PROPERTY"
>define</SPAN
></A
>,
<A
HREF="ref.define-format.html"
><SPAN
CLASS="PROPERTY"
>define_format</SPAN
></A
>,
<A
HREF="ref.define-header.html"
><SPAN
CLASS="PROPERTY"
>define_header</SPAN
></A
>,
<A
HREF="ref.define-proc.html"
><SPAN
CLASS="PROPERTY"
>define_proc</SPAN
></A
> and
<A
HREF="ref.if-define.html"
><SPAN
CLASS="PROPERTY"
>if_define</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.make-object.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.parent.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
><SPAN
CLASS="PROPERTY"
>make_object</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"
>parent</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			`>no_define</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="make_object"`
26			`HREF="ref.make-object.html"><LINK`
27			`REL="NEXT"`
28			`TITLE="parent"`
29			`HREF="ref.parent.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.make-object.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.parent.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.NO-DEFINE"><SPAN`
86			`CLASS="PROPERTY"`
87			`>no_define</SPAN`
88			`></H1`
89			`><DIV`
90			`CLASS="REFNAMEDIV"`
91			`><A`
92			`NAME="AEN4836"`
93			`></A`
94			`><H2`
95			`>Name</H2`
96			`>Property <SPAN`
97			`CLASS="PROPERTY"`
98			`>no_define</SPAN`
99			`> -- Suppress the normal generation of a preprocessor`
100			`<TT`
101			`CLASS="LITERAL"`
102			`>#define</TT`
103			`> symbol in a configuration header file.</DIV`
104			`><DIV`
105			`CLASS="REFSYNOPSISDIV"`
106			`><A`
107			`NAME="AEN4841"><H2`
108			`>Synopsis</H2`
109			`><TABLE`
110			`BORDER="5"`
111			`BGCOLOR="#E0E0F0"`
112			`WIDTH="70%"`
113			`><TR`
114			`><TD`
115			`><PRE`
116			`CLASS="SYNOPSIS"`
117			`>cdl_option <name> {`
118			`no_define`
119			`…`
120			`}</PRE`
121			`></TD`
122			`></TR`
123			`></TABLE`
124			`></DIV`
125			`><DIV`
126			`CLASS="REFSECT1"`
127			`><A`
128			`NAME="AEN4843"`
129			`></A`
130			`><H2`
131			`>Description</H2`
132			`><P`
133			`>By default all active and enabled properties result in either one or`
134			`two <TT`
135			`CLASS="LITERAL"`
136			`>#define'd</TT`
137			`> symbols in the package's`
138			`configuration header file, and this is one of the main ways in which`
139			`options can affect packages at build-time. It is possible to suppress`
140			`the default <TT`
141			`CLASS="LITERAL"`
142			`>#define's</TT`
143			`> by specifying a`
144			`<SPAN`
145			`CLASS="PROPERTY"`
146			`>no_define</SPAN`
147			`> property in the body of an option or other <SPAN`
148			`CLASS="APPLICATION"`
149			`>CDL</SPAN`
150			`> entity.`
151			`This property takes no arguments and should occur only once in a given`
152			`body. </P`
153			`><P`
154			`>The <SPAN`
155			`CLASS="PROPERTY"`
156			`>no_define</SPAN`
157			`> property is frequently used in conjunction with one of`
158			`the other header-file related properties such as <SPAN`
159			`CLASS="PROPERTY"`
160			`>define</SPAN`
161			`>. If one of`
162			`the other properties is used to export the required information to a`
163			`configuration header file then often there is little point in`
164			`exporting the default <TT`
165			`CLASS="LITERAL"`
166			`>#define</TT`
167			`> as`
168			`well —  in fact there could be a name clash. The`
169			`<SPAN`
170			`CLASS="PROPERTY"`
171			`>no_define</SPAN`
172			`> property can also be useful if the sole purpose of an`
173			`option is to affect which files get built, and the default`
174			`<TT`
175			`CLASS="LITERAL"`
176			`>#define</TT`
177			`> would never get tested in any source code.`
178			`However in such cases the default <TT`
179			`CLASS="LITERAL"`
180			`>#define</TT`
181			`> is`
182			`mostly harmless and there is little to be gained by suppressing it.</P`
183			`></DIV`
184			`><DIV`
185			`CLASS="REFSECT1"`
186			`><A`
187			`NAME="AEN4857"`
188			`></A`
189			`><H2`
190			`>Example</H2`
191			`><TABLE`
192			`BORDER="5"`
193			`BGCOLOR="#E0E0F0"`
194			`WIDTH="70%"`
195			`><TR`
196			`><TD`
197			`><PRE`
198			`CLASS="PROGRAMLISTING"`
199			`>cdl_component CYG_HAL_STARTUP {`
200			`display "Startup type"`
201			`flavor data`
202			`legal_values { "RAM" "ROM" }`
203			`default_value {"RAM"}`
204			`no_define`
205			`define -file system.h CYG_HAL_STARTUP`
206			`…`
207			`}</PRE`
208			`></TD`
209			`></TR`
210			`></TABLE`
211			`></DIV`
212			`><DIV`
213			`CLASS="REFSECT1"`
214			`><A`
215			`NAME="AEN4860"`
216			`></A`
217			`><H2`
218			`>See Also</H2`
219			`><P`
220			`>Properties <A`
221			`HREF="ref.define.html"`
222			`><SPAN`
223			`CLASS="PROPERTY"`
224			`>define</SPAN`
225			`></A`
226			`>,`
227			`<A`
228			`HREF="ref.define-format.html"`
229			`><SPAN`
230			`CLASS="PROPERTY"`
231			`>define_format</SPAN`
232			`></A`
233			`>,`
234			`<A`
235			`HREF="ref.define-header.html"`
236			`><SPAN`
237			`CLASS="PROPERTY"`
238			`>define_header</SPAN`
239			`></A`
240			`>,`
241			`<A`
242			`HREF="ref.define-proc.html"`
243			`><SPAN`
244			`CLASS="PROPERTY"`
245			`>define_proc</SPAN`
246			`></A`
247			`> and`
248			`<A`
249			`HREF="ref.if-define.html"`
250			`><SPAN`
251			`CLASS="PROPERTY"`
252			`>if_define</SPAN`
253			`></A`
254			`>.</P`
255			`></DIV`
256			`><DIV`
257			`CLASS="NAVFOOTER"`
258			`><HR`
259			`ALIGN="LEFT"`
260			`WIDTH="100%"><TABLE`
261			`SUMMARY="Footer navigation table"`
262			`WIDTH="100%"`
263			`BORDER="0"`
264			`CELLPADDING="0"`
265			`CELLSPACING="0"`
266			`><TR`
267			`><TD`
268			`WIDTH="33%"`
269			`ALIGN="left"`
270			`VALIGN="top"`
271			`><A`
272			`HREF="ref.make-object.html"`
273			`ACCESSKEY="P"`
274			`>Prev</A`
275			`></TD`
276			`><TD`
277			`WIDTH="34%"`
278			`ALIGN="center"`
279			`VALIGN="top"`
280			`><A`
281			`HREF="cdl-guide.html"`
282			`ACCESSKEY="H"`
283			`>Home</A`
284			`></TD`
285			`><TD`
286			`WIDTH="33%"`
287			`ALIGN="right"`
288			`VALIGN="top"`
289			`><A`
290			`HREF="ref.parent.html"`
291			`ACCESSKEY="N"`
292			`>Next</A`
293			`></TD`
294			`></TR`
295			`><TR`
296			`><TD`
297			`WIDTH="33%"`
298			`ALIGN="left"`
299			`VALIGN="top"`
300			`><SPAN`
301			`CLASS="PROPERTY"`
302			`>make_object</SPAN`
303			`></TD`
304			`><TD`
305			`WIDTH="34%"`
306			`ALIGN="center"`
307			`VALIGN="top"`
308			`><A`
309			`HREF="reference.html"`
310			`ACCESSKEY="U"`
311			`>Up</A`
312			`></TD`
313			`><TD`
314			`WIDTH="33%"`
315			`ALIGN="right"`
316			`VALIGN="top"`
317			`><SPAN`
318			`CLASS="PROPERTY"`
319			`>parent</SPAN`
320			`></TD`
321			`></TR`
322			`></TABLE`
323			`></DIV`
324			`></BODY`
325			`></HTML`
326			`>`

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[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [doc/] [html/] [cdl-guide/] [ref.no-define.html] - Blame information for rev 593