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<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
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><HEAD
><TITLE
>Building the System</TITLE
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><H1
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><A
NAME="BUILDING-THE-SYSTEM">Building the System</H1
><P
>Once a build tree has been generated with
          <B
CLASS="COMMAND"
>ecosconfig</B
>, building <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> is straightforward:</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="SCREEN"
>$ make</PRE
></TD
></TR
></TABLE
><P
>The build tree contains the subdirectories, makefiles,
          and everything else that is needed to generate the default
          configuration for the selected architecture and platform.
          The only requirement is that the tools needed for that
          architecture, for example
          <B
CLASS="COMMAND"
>powerpc-eabi-g++</B
>,
          are available using the standard search path. If this is not
          the case then the <B
CLASS="COMMAND"
>make</B
> will
          fail with an error message. If you have a multiprocessor
          system then it may be more efficient to use:</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="SCREEN"
>$ make -j <TT
CLASS="REPLACEABLE"
><I
>n</I
></TT
></PRE
></TD
></TR
></TABLE
><P
>where <TT
CLASS="REPLACEABLE"
><I
>n</I
></TT
> is equal to the
          number of processors on your system.</P
><P
>Once the <B
CLASS="COMMAND"
>make</B
> process
          has completed, the install tree will contain the header
          files and the target library that are needed for application
          development. </P
><P
>It is also possible to build the system&#8217;s test cases
for the current configuration:</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="SCREEN"
>$ make tests</PRE
></TD
></TR
></TABLE
><P
>The resulting test executables will end up in a
          <TT
CLASS="FILENAME"
>tests</TT
> subdirectory of the
          install tree. </P
><P
>If disk space is scarce then it is possible to make the copy
of the install tree for application development purposes, and then
use: </P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="SCREEN"
>$ make clean</PRE
></TD
></TR
></TABLE
><P
>The build tree will now use up a minimum of disk space &#8212; the
bulk of what is left consists of configuration header files that
you may have edited and hence should not be deleted automatically.
However, it is possible to rebuild the system at any time without
re-invoking <B
CLASS="COMMAND"
>ecosconfig</B
>, just by
running <B
CLASS="COMMAND"
>make</B
> again. </P
><P
>Under exceptional circumstances it may be necessary to run <B
CLASS="COMMAND"
>make
clean</B
> for other reasons, such as when a new release
of the toolchain is installed. The toolchain includes a number of
header files which are closely tied to the compiler, for example <TT
CLASS="FILENAME"
>limits.h</TT
>,
and these header files are not and should not be duplicated by <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
>.
The makefiles perform header file dependency analysis, so that when
a header file is changed all affected sources will be rebuilt during
the next <B
CLASS="COMMAND"
>make</B
>. This is very useful
when the configuration header files are changed, but it also means
that a build tree containing information about the locations of
header files must be rebuilt. If a new version of the toolchain
is installed and the old version is removed then this location information
is no longer accurate, and <B
CLASS="COMMAND"
>make</B
> will
complain that certain dependencies cannot be satisfied. Under such circumstances
it is necessary to do a <B
CLASS="COMMAND"
>make clean</B
> first. </P
></DIV
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CLASS="NAVFOOTER"
><HR
ALIGN="LEFT"
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SUMMARY="Footer navigation table"
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BORDER="0"
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ALIGN="left"
VALIGN="top"
><A
HREF="conflicts-and-constraints.html"
ACCESSKEY="P"
>Prev</A
></TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="ecos-user-guide.html"
ACCESSKEY="H"
>Home</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
><A
HREF="ecos-packages.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
>Conflicts and constraints</TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="manual-configuration.html"
ACCESSKEY="U"
>Up</A
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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			`>Building the System</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="eCos User Guide"`
20			`HREF="ecos-user-guide.html"><LINK`
21			`REL="UP"`
22			`TITLE="Manual Configuration"`
23			`HREF="manual-configuration.html"><LINK`
24			`REL="PREVIOUS"`
25			`TITLE="Conflicts and constraints"`
26			`HREF="conflicts-and-constraints.html"><LINK`
27			`REL="NEXT"`
28			`TITLE="Packages"`
29			`HREF="ecos-packages.html"></HEAD`
30			`><BODY`
31			`CLASS="SECT1"`
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			`>eCos User Guide</TH`
50			`></TR`
51			`><TR`
52			`><TD`
53			`WIDTH="10%"`
54			`ALIGN="left"`
55			`VALIGN="bottom"`
56			`><A`
57			`HREF="conflicts-and-constraints.html"`
58			`ACCESSKEY="P"`
59			`>Prev</A`
60			`></TD`
61			`><TD`
62			`WIDTH="80%"`
63			`ALIGN="center"`
64			`VALIGN="bottom"`
65			`>Chapter 28. Manual Configuration</TD`
66			`><TD`
67			`WIDTH="10%"`
68			`ALIGN="right"`
69			`VALIGN="bottom"`
70			`><A`
71			`HREF="ecos-packages.html"`
72			`ACCESSKEY="N"`
73			`>Next</A`
74			`></TD`
75			`></TR`
76			`></TABLE`
77			`><HR`
78			`ALIGN="LEFT"`
79			`WIDTH="100%"></DIV`
80			`><DIV`
81			`CLASS="SECT1"`
82			`><H1`
83			`CLASS="SECT1"`
84			`><A`
85			`NAME="BUILDING-THE-SYSTEM">Building the System</H1`
86			`><P`
87			`>Once a build tree has been generated with`
88			`<B`
89			`CLASS="COMMAND"`
90			`>ecosconfig</B`
91			`>, building <SPAN`
92			`CLASS="PRODUCTNAME"`
93			`>eCos</SPAN`
94			`> is straightforward:</P`
95			`><TABLE`
96			`BORDER="5"`
97			`BGCOLOR="#E0E0F0"`
98			`WIDTH="70%"`
99			`><TR`
100			`><TD`
101			`><PRE`
102			`CLASS="SCREEN"`
103			`>$ make</PRE`
104			`></TD`
105			`></TR`
106			`></TABLE`
107			`><P`
108			`>The build tree contains the subdirectories, makefiles,`
109			`and everything else that is needed to generate the default`
110			`configuration for the selected architecture and platform.`
111			`The only requirement is that the tools needed for that`
112			`architecture, for example`
113			`<B`
114			`CLASS="COMMAND"`
115			`>powerpc-eabi-g++</B`
116			`>,`
117			`are available using the standard search path. If this is not`
118			`the case then the <B`
119			`CLASS="COMMAND"`
120			`>make</B`
121			`> will`
122			`fail with an error message. If you have a multiprocessor`
123			`system then it may be more efficient to use:</P`
124			`><TABLE`
125			`BORDER="5"`
126			`BGCOLOR="#E0E0F0"`
127			`WIDTH="70%"`
128			`><TR`
129			`><TD`
130			`><PRE`
131			`CLASS="SCREEN"`
132			`>$ make -j <TT`
133			`CLASS="REPLACEABLE"`
134			`><I`
135			`>n</I`
136			`></TT`
137			`></PRE`
138			`></TD`
139			`></TR`
140			`></TABLE`
141			`><P`
142			`>where <TT`
143			`CLASS="REPLACEABLE"`
144			`><I`
145			`>n</I`
146			`></TT`
147			`> is equal to the`
148			`number of processors on your system.</P`
149			`><P`
150			`>Once the <B`
151			`CLASS="COMMAND"`
152			`>make</B`
153			`> process`
154			`has completed, the install tree will contain the header`
155			`files and the target library that are needed for application`
156			`development. </P`
157			`><P`
158			`>It is also possible to build the system’s test cases`
159			`for the current configuration:</P`
160			`><TABLE`
161			`BORDER="5"`
162			`BGCOLOR="#E0E0F0"`
163			`WIDTH="70%"`
164			`><TR`
165			`><TD`
166			`><PRE`
167			`CLASS="SCREEN"`
168			`>$ make tests</PRE`
169			`></TD`
170			`></TR`
171			`></TABLE`
172			`><P`
173			`>The resulting test executables will end up in a`
174			`<TT`
175			`CLASS="FILENAME"`
176			`>tests</TT`
177			`> subdirectory of the`
178			`install tree. </P`
179			`><P`
180			`>If disk space is scarce then it is possible to make the copy`
181			`of the install tree for application development purposes, and then`
182			`use: </P`
183			`><TABLE`
184			`BORDER="5"`
185			`BGCOLOR="#E0E0F0"`
186			`WIDTH="70%"`
187			`><TR`
188			`><TD`
189			`><PRE`
190			`CLASS="SCREEN"`
191			`>$ make clean</PRE`
192			`></TD`
193			`></TR`
194			`></TABLE`
195			`><P`
196			`>The build tree will now use up a minimum of disk space — the`
197			`bulk of what is left consists of configuration header files that`
198			`you may have edited and hence should not be deleted automatically.`
199			`However, it is possible to rebuild the system at any time without`
200			`re-invoking <B`
201			`CLASS="COMMAND"`
202			`>ecosconfig</B`
203			`>, just by`
204			`running <B`
205			`CLASS="COMMAND"`
206			`>make</B`
207			`> again. </P`
208			`><P`
209			`>Under exceptional circumstances it may be necessary to run <B`
210			`CLASS="COMMAND"`
211			`>make`
212			`clean</B`
213			`> for other reasons, such as when a new release`
214			`of the toolchain is installed. The toolchain includes a number of`
215			`header files which are closely tied to the compiler, for example <TT`
216			`CLASS="FILENAME"`
217			`>limits.h</TT`
218			`>,`
219			`and these header files are not and should not be duplicated by <SPAN`
220			`CLASS="PRODUCTNAME"`
221			`>eCos</SPAN`
222			`>.`
223			`The makefiles perform header file dependency analysis, so that when`
224			`a header file is changed all affected sources will be rebuilt during`
225			`the next <B`
226			`CLASS="COMMAND"`
227			`>make</B`
228			`>. This is very useful`
229			`when the configuration header files are changed, but it also means`
230			`that a build tree containing information about the locations of`
231			`header files must be rebuilt. If a new version of the toolchain`
232			`is installed and the old version is removed then this location information`
233			`is no longer accurate, and <B`
234			`CLASS="COMMAND"`
235			`>make</B`
236			`> will`
237			`complain that certain dependencies cannot be satisfied. Under such circumstances`
238			`it is necessary to do a <B`
239			`CLASS="COMMAND"`
240			`>make clean</B`
241			`> first. </P`
242			`></DIV`
243			`><DIV`
244			`CLASS="NAVFOOTER"`
245			`><HR`
246			`ALIGN="LEFT"`
247			`WIDTH="100%"><TABLE`
248			`SUMMARY="Footer navigation table"`
249			`WIDTH="100%"`
250			`BORDER="0"`
251			`CELLPADDING="0"`
252			`CELLSPACING="0"`
253			`><TR`
254			`><TD`
255			`WIDTH="33%"`
256			`ALIGN="left"`
257			`VALIGN="top"`
258			`><A`
259			`HREF="conflicts-and-constraints.html"`
260			`ACCESSKEY="P"`
261			`>Prev</A`
262			`></TD`
263			`><TD`
264			`WIDTH="34%"`
265			`ALIGN="center"`
266			`VALIGN="top"`
267			`><A`
268			`HREF="ecos-user-guide.html"`
269			`ACCESSKEY="H"`
270			`>Home</A`
271			`></TD`
272			`><TD`
273			`WIDTH="33%"`
274			`ALIGN="right"`
275			`VALIGN="top"`
276			`><A`
277			`HREF="ecos-packages.html"`
278			`ACCESSKEY="N"`
279			`>Next</A`
280			`></TD`
281			`></TR`
282			`><TR`
283			`><TD`
284			`WIDTH="33%"`
285			`ALIGN="left"`
286			`VALIGN="top"`
287			`>Conflicts and constraints</TD`
288			`><TD`
289			`WIDTH="34%"`
290			`ALIGN="center"`
291			`VALIGN="top"`
292			`><A`
293			`HREF="manual-configuration.html"`
294			`ACCESSKEY="U"`
295			`>Up</A`
296			`></TD`
297			`><TD`
298			`WIDTH="33%"`
299			`ALIGN="right"`
300			`VALIGN="top"`
301			`>Packages</TD`
302			`></TR`
303			`></TABLE`
304			`></DIV`
305			`></BODY`
306			`></HTML`
307			`>`

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