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<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
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<HTML
><HEAD
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>define_header</TITLE
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><DIV
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><TR
><TH
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>The <SPAN
CLASS="APPLICATION"
>eCos</SPAN
> Component Writer's Guide</TH
></TR
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><H1
><A
NAME="REF.DEFINE-HEADER"><SPAN
CLASS="PROPERTY"
>define_header</SPAN
></H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN4123"
></A
><H2
>Name</H2
>Property <SPAN
CLASS="PROPERTY"
>define_header</SPAN
>&nbsp;--&nbsp;Specify the  configuration header file that
will be generated for a given package.</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN4127"><H2
>Synopsis</H2
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="SYNOPSIS"
>cdl_package &lt;name&gt; {
    define_header &lt;file name&gt;
    &#8230;
}</PRE
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN4129"
></A
><H2
>Description</H2
><P
>When the configuration tools generate a build tree, one of the steps
is to output each package's configuration data to a header file. For
example the kernel's configuration data gets output to
<TT
CLASS="FILENAME"
>pkgconf/kernel.h</TT
>. This allows
each package's source code to <TT
CLASS="LITERAL"
>#include</TT
> the
appropriate header file and adapt to the choices made by the user.</P
><P
>By default the configuration tools will synthesize a file name from
the package name. This involves removing any prefix such as
<TT
CLASS="LITERAL"
>CYGPKG_</TT
>, up to and including the first underscore,
and then converting the remainder of the name to lower case. In some
cases it may be desirable to use a different header file, for example
an existing package may have been ported to <SPAN
CLASS="APPLICATION"
>eCos</SPAN
> and the source code
may already <TT
CLASS="LITERAL"
>#include</TT
> a particular file for
configuration data. In such cases a <SPAN
CLASS="PROPERTY"
>define_header</SPAN
> property can be
used to specify an alternative filename.</P
><P
>The <SPAN
CLASS="PROPERTY"
>define_header</SPAN
> property can only be used in the body of a
<TT
CLASS="LITERAL"
>cdl_package</TT
> command. It applies to a package as a whole and cannot
be used at a finer grain. The name specified in a <SPAN
CLASS="PROPERTY"
>define_header</SPAN
>
property will always be interpreted as relative to the
<TT
CLASS="FILENAME"
>include/pkgconf</TT
> sub-directory
of the install tree.</P
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Note: </B
>For hardware-specific packages such as device drivers and HAL
packages, the current scheme of generating a configuration header file
name based on the package name may be abandoned. Instead all hardware
packages would send their configuration data to a single header file,
<TT
CLASS="FILENAME"
>pkgconf/hardware.h</TT
>. This would
make it easier for code to obtain details of the current hardware, but
obviously there are compatibility issues. For now it is recommended
that all hardware packages specify their configuration header file
explicitly. </P
></BLOCKQUOTE
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN4147"
></A
><H2
>Example</H2
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>cdl_package CYGPKG_HAL_ARM {
    display       "ARM architecture"
    parent        CYGPKG_HAL
    hardware
    include_dir   cyg/hal
    define_header hal_arm.h
    &#8230;
}</PRE
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN4150"
></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-proc.html"
><SPAN
CLASS="PROPERTY"
>define_proc</SPAN
></A
>,
<A
HREF="ref.if-define.html"
><SPAN
CLASS="PROPERTY"
>if_define</SPAN
></A
>,
<A
HREF="ref.no-define.html"
><SPAN
CLASS="PROPERTY"
>no_define</SPAN
></A
> and
<A
HREF="ref.hardware.html"
><SPAN
CLASS="PROPERTY"
>hardware</SPAN
></A
>,</P
></DIV
><DIV
CLASS="NAVFOOTER"
><HR
ALIGN="LEFT"
WIDTH="100%"><TABLE
SUMMARY="Footer navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
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><TR
><TD
WIDTH="33%"
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VALIGN="top"
><A
HREF="ref.define-format.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.define-proc.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
><SPAN
CLASS="PROPERTY"
>define_format</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"
>define_proc</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			`>define_header</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_format"`
26			`HREF="ref.define-format.html"><LINK`
27			`REL="NEXT"`
28			`TITLE="define_proc"`
29			`HREF="ref.define-proc.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-format.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.define-proc.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.DEFINE-HEADER"><SPAN`
86			`CLASS="PROPERTY"`
87			`>define_header</SPAN`
88			`></H1`
89			`><DIV`
90			`CLASS="REFNAMEDIV"`
91			`><A`
92			`NAME="AEN4123"`
93			`></A`
94			`><H2`
95			`>Name</H2`
96			`>Property <SPAN`
97			`CLASS="PROPERTY"`
98			`>define_header</SPAN`
99			`> -- Specify the configuration header file that`
100			`will be generated for a given package.</DIV`
101			`><DIV`
102			`CLASS="REFSYNOPSISDIV"`
103			`><A`
104			`NAME="AEN4127"><H2`
105			`>Synopsis</H2`
106			`><TABLE`
107			`BORDER="5"`
108			`BGCOLOR="#E0E0F0"`
109			`WIDTH="70%"`
110			`><TR`
111			`><TD`
112			`><PRE`
113			`CLASS="SYNOPSIS"`
114			`>cdl_package <name> {`
115			`define_header <file name>`
116			`…`
117			`}</PRE`
118			`></TD`
119			`></TR`
120			`></TABLE`
121			`></DIV`
122			`><DIV`
123			`CLASS="REFSECT1"`
124			`><A`
125			`NAME="AEN4129"`
126			`></A`
127			`><H2`
128			`>Description</H2`
129			`><P`
130			`>When the configuration tools generate a build tree, one of the steps`
131			`is to output each package's configuration data to a header file. For`
132			`example the kernel's configuration data gets output to`
133			`<TT`
134			`CLASS="FILENAME"`
135			`>pkgconf/kernel.h</TT`
136			`>. This allows`
137			`each package's source code to <TT`
138			`CLASS="LITERAL"`
139			`>#include</TT`
140			`> the`
141			`appropriate header file and adapt to the choices made by the user.</P`
142			`><P`
143			`>By default the configuration tools will synthesize a file name from`
144			`the package name. This involves removing any prefix such as`
145			`<TT`
146			`CLASS="LITERAL"`
147			`>CYGPKG_</TT`
148			`>, up to and including the first underscore,`
149			`and then converting the remainder of the name to lower case. In some`
150			`cases it may be desirable to use a different header file, for example`
151			`an existing package may have been ported to <SPAN`
152			`CLASS="APPLICATION"`
153			`>eCos</SPAN`
154			`> and the source code`
155			`may already <TT`
156			`CLASS="LITERAL"`
157			`>#include</TT`
158			`> a particular file for`
159			`configuration data. In such cases a <SPAN`
160			`CLASS="PROPERTY"`
161			`>define_header</SPAN`
162			`> property can be`
163			`used to specify an alternative filename.</P`
164			`><P`
165			`>The <SPAN`
166			`CLASS="PROPERTY"`
167			`>define_header</SPAN`
168			`> property can only be used in the body of a`
169			`<TT`
170			`CLASS="LITERAL"`
171			`>cdl_package</TT`
172			`> command. It applies to a package as a whole and cannot`
173			`be used at a finer grain. The name specified in a <SPAN`
174			`CLASS="PROPERTY"`
175			`>define_header</SPAN`
176			`>`
177			`property will always be interpreted as relative to the`
178			`<TT`
179			`CLASS="FILENAME"`
180			`>include/pkgconf</TT`
181			`> sub-directory`
182			`of the install tree.</P`
183			`><DIV`
184			`CLASS="NOTE"`
185			`><BLOCKQUOTE`
186			`CLASS="NOTE"`
187			`><P`
188			`><B`
189			`>Note: </B`
190			`>For hardware-specific packages such as device drivers and HAL`
191			`packages, the current scheme of generating a configuration header file`
192			`name based on the package name may be abandoned. Instead all hardware`
193			`packages would send their configuration data to a single header file,`
194			`<TT`
195			`CLASS="FILENAME"`
196			`>pkgconf/hardware.h</TT`
197			`>. This would`
198			`make it easier for code to obtain details of the current hardware, but`
199			`obviously there are compatibility issues. For now it is recommended`
200			`that all hardware packages specify their configuration header file`
201			`explicitly. </P`
202			`></BLOCKQUOTE`
203			`></DIV`
204			`></DIV`
205			`><DIV`
206			`CLASS="REFSECT1"`
207			`><A`
208			`NAME="AEN4147"`
209			`></A`
210			`><H2`
211			`>Example</H2`
212			`><TABLE`
213			`BORDER="5"`
214			`BGCOLOR="#E0E0F0"`
215			`WIDTH="70%"`
216			`><TR`
217			`><TD`
218			`><PRE`
219			`CLASS="PROGRAMLISTING"`
220			`>cdl_package CYGPKG_HAL_ARM {`
221			`display "ARM architecture"`
222			`parent CYGPKG_HAL`
223			`hardware`
224			`include_dir cyg/hal`
225			`define_header hal_arm.h`
226			`…`
227			`}</PRE`
228			`></TD`
229			`></TR`
230			`></TABLE`
231			`></DIV`
232			`><DIV`
233			`CLASS="REFSECT1"`
234			`><A`
235			`NAME="AEN4150"`
236			`></A`
237			`><H2`
238			`>See Also</H2`
239			`><P`
240			`>Properties <A`
241			`HREF="ref.define.html"`
242			`><SPAN`
243			`CLASS="PROPERTY"`
244			`>define</SPAN`
245			`></A`
246			`>,`
247			`<A`
248			`HREF="ref.define-format.html"`
249			`><SPAN`
250			`CLASS="PROPERTY"`
251			`>define_format</SPAN`
252			`></A`
253			`>,`
254			`<A`
255			`HREF="ref.define-proc.html"`
256			`><SPAN`
257			`CLASS="PROPERTY"`
258			`>define_proc</SPAN`
259			`></A`
260			`>,`
261			`<A`
262			`HREF="ref.if-define.html"`
263			`><SPAN`
264			`CLASS="PROPERTY"`
265			`>if_define</SPAN`
266			`></A`
267			`>,`
268			`<A`
269			`HREF="ref.no-define.html"`
270			`><SPAN`
271			`CLASS="PROPERTY"`
272			`>no_define</SPAN`
273			`></A`
274			`> and`
275			`<A`
276			`HREF="ref.hardware.html"`
277			`><SPAN`
278			`CLASS="PROPERTY"`
279			`>hardware</SPAN`
280			`></A`
281			`>,</P`
282			`></DIV`
283			`><DIV`
284			`CLASS="NAVFOOTER"`
285			`><HR`
286			`ALIGN="LEFT"`
287			`WIDTH="100%"><TABLE`
288			`SUMMARY="Footer navigation table"`
289			`WIDTH="100%"`
290			`BORDER="0"`
291			`CELLPADDING="0"`
292			`CELLSPACING="0"`
293			`><TR`
294			`><TD`
295			`WIDTH="33%"`
296			`ALIGN="left"`
297			`VALIGN="top"`
298			`><A`
299			`HREF="ref.define-format.html"`
300			`ACCESSKEY="P"`
301			`>Prev</A`
302			`></TD`
303			`><TD`
304			`WIDTH="34%"`
305			`ALIGN="center"`
306			`VALIGN="top"`
307			`><A`
308			`HREF="cdl-guide.html"`
309			`ACCESSKEY="H"`
310			`>Home</A`
311			`></TD`
312			`><TD`
313			`WIDTH="33%"`
314			`ALIGN="right"`
315			`VALIGN="top"`
316			`><A`
317			`HREF="ref.define-proc.html"`
318			`ACCESSKEY="N"`
319			`>Next</A`
320			`></TD`
321			`></TR`
322			`><TR`
323			`><TD`
324			`WIDTH="33%"`
325			`ALIGN="left"`
326			`VALIGN="top"`
327			`><SPAN`
328			`CLASS="PROPERTY"`
329			`>define_format</SPAN`
330			`></TD`
331			`><TD`
332			`WIDTH="34%"`
333			`ALIGN="center"`
334			`VALIGN="top"`
335			`><A`
336			`HREF="reference.html"`
337			`ACCESSKEY="U"`
338			`>Up</A`
339			`></TD`
340			`><TD`
341			`WIDTH="33%"`
342			`ALIGN="right"`
343			`VALIGN="top"`
344			`><SPAN`
345			`CLASS="PROPERTY"`
346			`>define_proc</SPAN`
347			`></TD`
348			`></TR`
349			`></TABLE`
350			`></DIV`
351			`></BODY`
352			`></HTML`
353			`>`

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