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<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
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NAME="EDITING-THE-SOURCES">Editing the Sources</H1
><P
>For many users, controlling the packages and
          manipulating the available configuration options will be
          sufficient to create an embedded operating system that meets
          the application's requirements. However, since <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> is
          shipped entirely in source form, it is possible to go
          further when necessary: you can edit the <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> sources themselves. This requires some
          understanding of the way the <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> build system works.
        </P
><P
>The most obvious place to edit the source code is directly
in the component repository. For example, you could
edit the file <TT
CLASS="FILENAME"
>kernel/<TT
CLASS="REPLACEABLE"
><I
>&#60;version&#62;</I
></TT
>/src/sync/mutex.cxx</TT
>
to change the way kernel mutexes work, or possibly just to add some
extra diagnostics or assertions. Once the file has been edited,
it is possible to invoke <B
CLASS="COMMAND"
>make</B
> at
the top level of the build tree and the target library will be rebuilt
as required. A small optimization is possible: the build tree is
largely a mirror of the component repository, so it too will contain
a subdirectory <TT
CLASS="FILENAME"
>kernel/<TT
CLASS="REPLACEABLE"
><I
>&#60;version&#62;</I
></TT
></TT
>;
if make is invoked in this directory
then it will only check for changes to the kernel sources, which
is a bit more efficient than checking for changes throughout the component
repository. </P
><P
>Editing a file in the component repository is fine if this
tree is used for only one <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> configuration. If the repository
is used for several different configurations, however, and especially
if it is shared by multiple users, then making what may be experimental
changes to the master sources would be a bad idea. The build system provides
an alternative. It is possible to make a copy of the file in the
build tree, in other words copy <TT
CLASS="FILENAME"
>mutex.cxx</TT
> from
the <TT
CLASS="FILENAME"
>kernel/<TT
CLASS="REPLACEABLE"
><I
>&#60;version&#62;</I
></TT
>/src/sync</TT
> directory
in the component repository to <TT
CLASS="FILENAME"
>kernel/<TT
CLASS="REPLACEABLE"
><I
>&#60;version&#62;</I
></TT
>/src/sync</TT
> in
the build tree, and edit the file in the build tree. When <B
CLASS="COMMAND"
>make</B
> is
invoked it will pick up local copies of any of the sources in preference
to the master versions in the component repository. Once you have
finished modifying the <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> sources you can install the final version
back in the component repository. If the changes were temporary
in nature and only served to aid the debugging process, then you
can discard the modified version of the sources. </P
><P
>The situation is slightly more complicated for the header
files that a package may export, such as the C library&#8217;s <TT
CLASS="FILENAME"
>stdio.h</TT
> header
file, which can be found in the directory <TT
CLASS="FILENAME"
>language/c/libc/<TT
CLASS="REPLACEABLE"
><I
>&#60;version&#62;</I
></TT
>/include</TT
>.
If such a header file is changed, either directly in the component
repository or after copying it to the build tree, then <B
CLASS="COMMAND"
>make</B
> must
be invoked at the top level of the build tree. In cases like this
it is not safe to rebuild just the C library because other packages
may depend on the contents of <TT
CLASS="FILENAME"
>stdio.h</TT
>. </P
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WIDTH="33%"
ALIGN="left"
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> Savefile</TD
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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			`>Editing the Sources</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="Editing an eCos Savefile"`
26			`HREF="editing-an-ecos-savefile.html"><LINK`
27			`REL="NEXT"`
28			`TITLE="Modifying the Memory Layout"`
29			`HREF="modifying-the-memory-layout.html"></HEAD`
30			`><BODY`
31			`CLASS="SECT1"`
32			`BGCOLOR="#FFFFFF"`
33			`TEXT="#000000"`
34			`LINK="#0000FF"`
35			`VLINK="#840084"`
36			`ALINK="#0000FF"`
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42			`BORDER="0"`
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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="editing-an-ecos-savefile.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="modifying-the-memory-layout.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="EDITING-THE-SOURCES">Editing the Sources</H1`
86			`><P`
87			`>For many users, controlling the packages and`
88			`manipulating the available configuration options will be`
89			`sufficient to create an embedded operating system that meets`
90			`the application's requirements. However, since <SPAN`
91			`CLASS="PRODUCTNAME"`
92			`>eCos</SPAN`
93			`> is`
94			`shipped entirely in source form, it is possible to go`
95			`further when necessary: you can edit the <SPAN`
96			`CLASS="PRODUCTNAME"`
97			`>eCos</SPAN`
98			`> sources themselves. This requires some`
99			`understanding of the way the <SPAN`
100			`CLASS="PRODUCTNAME"`
101			`>eCos</SPAN`
102			`> build system works.`
103			`</P`
104			`><P`
105			`>The most obvious place to edit the source code is directly`
106			`in the component repository. For example, you could`
107			`edit the file <TT`
108			`CLASS="FILENAME"`
109			`>kernel/<TT`
110			`CLASS="REPLACEABLE"`
111			`><I`
112			`><version></I`
113			`></TT`
114			`>/src/sync/mutex.cxx</TT`
115			`>`
116			`to change the way kernel mutexes work, or possibly just to add some`
117			`extra diagnostics or assertions. Once the file has been edited,`
118			`it is possible to invoke <B`
119			`CLASS="COMMAND"`
120			`>make</B`
121			`> at`
122			`the top level of the build tree and the target library will be rebuilt`
123			`as required. A small optimization is possible: the build tree is`
124			`largely a mirror of the component repository, so it too will contain`
125			`a subdirectory <TT`
126			`CLASS="FILENAME"`
127			`>kernel/<TT`
128			`CLASS="REPLACEABLE"`
129			`><I`
130			`><version></I`
131			`></TT`
132			`></TT`
133			`>;`
134			`if make is invoked in this directory`
135			`then it will only check for changes to the kernel sources, which`
136			`is a bit more efficient than checking for changes throughout the component`
137			`repository. </P`
138			`><P`
139			`>Editing a file in the component repository is fine if this`
140			`tree is used for only one <SPAN`
141			`CLASS="PRODUCTNAME"`
142			`>eCos</SPAN`
143			`> configuration. If the repository`
144			`is used for several different configurations, however, and especially`
145			`if it is shared by multiple users, then making what may be experimental`
146			`changes to the master sources would be a bad idea. The build system provides`
147			`an alternative. It is possible to make a copy of the file in the`
148			`build tree, in other words copy <TT`
149			`CLASS="FILENAME"`
150			`>mutex.cxx</TT`
151			`> from`
152			`the <TT`
153			`CLASS="FILENAME"`
154			`>kernel/<TT`
155			`CLASS="REPLACEABLE"`
156			`><I`
157			`><version></I`
158			`></TT`
159			`>/src/sync</TT`
160			`> directory`
161			`in the component repository to <TT`
162			`CLASS="FILENAME"`
163			`>kernel/<TT`
164			`CLASS="REPLACEABLE"`
165			`><I`
166			`><version></I`
167			`></TT`
168			`>/src/sync</TT`
169			`> in`
170			`the build tree, and edit the file in the build tree. When <B`
171			`CLASS="COMMAND"`
172			`>make</B`
173			`> is`
174			`invoked it will pick up local copies of any of the sources in preference`
175			`to the master versions in the component repository. Once you have`
176			`finished modifying the <SPAN`
177			`CLASS="PRODUCTNAME"`
178			`>eCos</SPAN`
179			`> sources you can install the final version`
180			`back in the component repository. If the changes were temporary`
181			`in nature and only served to aid the debugging process, then you`
182			`can discard the modified version of the sources. </P`
183			`><P`
184			`>The situation is slightly more complicated for the header`
185			`files that a package may export, such as the C library’s <TT`
186			`CLASS="FILENAME"`
187			`>stdio.h</TT`
188			`> header`
189			`file, which can be found in the directory <TT`
190			`CLASS="FILENAME"`
191			`>language/c/libc/<TT`
192			`CLASS="REPLACEABLE"`
193			`><I`
194			`><version></I`
195			`></TT`
196			`>/include</TT`
197			`>.`
198			`If such a header file is changed, either directly in the component`
199			`repository or after copying it to the build tree, then <B`
200			`CLASS="COMMAND"`
201			`>make</B`
202			`> must`
203			`be invoked at the top level of the build tree. In cases like this`
204			`it is not safe to rebuild just the C library because other packages`
205			`may depend on the contents of <TT`
206			`CLASS="FILENAME"`
207			`>stdio.h</TT`
208			`>. </P`
209			`></DIV`
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246			`>Next</A`
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249			`><TR`
250			`><TD`
251			`WIDTH="33%"`
252			`ALIGN="left"`
253			`VALIGN="top"`
254			`>Editing an <SPAN`
255			`CLASS="PRODUCTNAME"`
256			`>eCos</SPAN`
257			`> Savefile</TD`
258			`><TD`
259			`WIDTH="34%"`
260			`ALIGN="center"`
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277			`>`

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