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><DIV
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><DL
><DT
><B
>Table of Contents</B
></DT
><DT
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>Compiling a C Application</A
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>Compiling a C++ Application</A
></DT
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><P
><SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> is built using
      the GNU C and C++ compilers. <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> relies on certain features of these
      tools such as constructor priority ordering and selective linking
      which are not part of other toolchains.
    </P
><P
>Some <SPAN
CLASS="APPLICATION"
>GCC</SPAN
> options are required for <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
>,
and others can be useful. This chapter gives a brief description
of the required options as well as some recommended <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
>-specific options.
All other <SPAN
CLASS="APPLICATION"
>GCC</SPAN
> options (described in the <SPAN
CLASS="APPLICATION"
>GCC</SPAN
> manuals)
are available. </P
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="COMPILING-C-APP">Compiling a C Application</H1
><P
>The following command lines demonstrate the
          <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>minimum</I
></SPAN
> set of options required to
          compile and link an <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> program written in C. </P
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Note: </B
>Remember that when this manual shows
            <B
CLASS="COMMAND"
><TT
CLASS="REPLACEABLE"
><I
>TARGET-</I
></TT
>gcc</B
>
            you should use the full name of the cross compiler,
            e.g. <B
CLASS="COMMAND"
>i386-elf-gcc</B
>,
            <B
CLASS="COMMAND"
>arm-elf-gcc</B
>, or
            <B
CLASS="COMMAND"
>sh-elf-gcc</B
>. When compiling for the
            synthetic Linux target, use the native
            <B
CLASS="COMMAND"
>gcc</B
> which must have the features
            required by <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
>.</P
></BLOCKQUOTE
></DIV
><TABLE
BORDER="5"
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><TR
><TD
><PRE
CLASS="SCREEN"
>$ <TT
CLASS="REPLACEABLE"
><I
>TARGET-</I
></TT
>gcc -c  -I<SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>INSTALL_DIR</I
></SPAN
>/include file.c
$ <TT
CLASS="REPLACEABLE"
><I
>TARGET-</I
></TT
>gcc -o program file.o -L<SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>INSTALL_DIR</I
></SPAN
>/lib -Ttarget.ld -nostdlib</PRE
></TD
></TR
></TABLE
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Note: </B
>Certain targets may require extra options, for example
            the SPARClite architectures require the option
            <TT
CLASS="OPTION"
>-mcpu=sparclite</TT
>. Examine the
            <TT
CLASS="FILENAME"
><TT
CLASS="REPLACEABLE"
><I
>BASE_DIR</I
></TT
>/examples/Makefile</TT
>
            or the &#8220;Global compiler flags&#8221; option
            (CYGBLD_GLOBAL_CFLAGS) in your generated
            <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> configuration) to see if any extra options are
            required, and if so, what they are. </P
><P
>The following command lines use some other options
            which are recommended because they use the
        selective linking feature:</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="SCREEN"
>$ <TT
CLASS="REPLACEABLE"
><I
>TARGET-</I
></TT
>gcc -c  -I<TT
CLASS="REPLACEABLE"
><I
>INSTALL_DIR</I
></TT
>/include -I. -ffunction-sections -fdata-sections -g -O2 file.c
$ <TT
CLASS="REPLACEABLE"
><I
>TARGET-</I
></TT
>gcc -o program file.o -ffunction-sections -fdata-sections -Wl,--gc-sections -g -O2 \
          -L<TT
CLASS="REPLACEABLE"
><I
>INSTALL_DIR</I
></TT
>/lib -Ttarget.ld -nostdlib</PRE
></TD
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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			`>Compiler and Linker Options</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="eCos Programming Concepts and Techniques"`
23			`HREF="ecos-programming-concepts-and-techniques.html"><LINK`
24			`REL="PREVIOUS"`
25			`TITLE="Application Build Tree"`
26			`HREF="repository-app-build-tree.html"><LINK`
27			`REL="NEXT"`
28			`TITLE="Compiling a C++ Application"`
29			`HREF="compiling-cpp-app.html"></HEAD`
30			`><BODY`
31			`CLASS="CHAPTER"`
32			`BGCOLOR="#FFFFFF"`
33			`TEXT="#000000"`
34			`LINK="#0000FF"`
35			`VLINK="#840084"`
36			`ALINK="#0000FF"`
37			`><DIV`
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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="repository-app-build-tree.html"`
58			`ACCESSKEY="P"`
59			`>Prev</A`
60			`></TD`
61			`><TD`
62			`WIDTH="80%"`
63			`ALIGN="center"`
64			`VALIGN="bottom"`
65			`></TD`
66			`><TD`
67			`WIDTH="10%"`
68			`ALIGN="right"`
69			`VALIGN="bottom"`
70			`><A`
71			`HREF="compiling-cpp-app.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="CHAPTER"`
82			`><H1`
83			`><A`
84			`NAME="COMPILER-AND-LINKER-OPTIONS">Chapter 26. Compiler and Linker Options</H1`
85			`><DIV`
86			`CLASS="TOC"`
87			`><DL`
88			`><DT`
89			`><B`
90			`>Table of Contents</B`
91			`></DT`
92			`><DT`
93			`><A`
94			`HREF="compiler-and-linker-options.html#COMPILING-C-APP"`
95			`>Compiling a C Application</A`
96			`></DT`
97			`><DT`
98			`><A`
99			`HREF="compiling-cpp-app.html"`
100			`>Compiling a C++ Application</A`
101			`></DT`
102			`></DL`
103			`></DIV`
104			`><P`
105			`><SPAN`
106			`CLASS="PRODUCTNAME"`
107			`>eCos</SPAN`
108			`> is built using`
109			`the GNU C and C++ compilers. <SPAN`
110			`CLASS="PRODUCTNAME"`
111			`>eCos</SPAN`
112			`> relies on certain features of these`
113			`tools such as constructor priority ordering and selective linking`
114			`which are not part of other toolchains.`
115			`</P`
116			`><P`
117			`>Some <SPAN`
118			`CLASS="APPLICATION"`
119			`>GCC</SPAN`
120			`> options are required for <SPAN`
121			`CLASS="PRODUCTNAME"`
122			`>eCos</SPAN`
123			`>,`
124			`and others can be useful. This chapter gives a brief description`
125			`of the required options as well as some recommended <SPAN`
126			`CLASS="PRODUCTNAME"`
127			`>eCos</SPAN`
128			`>-specific options.`
129			`All other <SPAN`
130			`CLASS="APPLICATION"`
131			`>GCC</SPAN`
132			`> options (described in the <SPAN`
133			`CLASS="APPLICATION"`
134			`>GCC</SPAN`
135			`> manuals)`
136			`are available. </P`
137			`><DIV`
138			`CLASS="SECT1"`
139			`><H1`
140			`CLASS="SECT1"`
141			`><A`
142			`NAME="COMPILING-C-APP">Compiling a C Application</H1`
143			`><P`
144			`>The following command lines demonstrate the`
145			`<SPAN`
146			`CLASS="emphasis"`
147			`><I`
148			`CLASS="EMPHASIS"`
149			`>minimum</I`
150			`></SPAN`
151			`> set of options required to`
152			`compile and link an <SPAN`
153			`CLASS="PRODUCTNAME"`
154			`>eCos</SPAN`
155			`> program written in C. </P`
156			`><DIV`
157			`CLASS="NOTE"`
158			`><BLOCKQUOTE`
159			`CLASS="NOTE"`
160			`><P`
161			`><B`
162			`>Note: </B`
163			`>Remember that when this manual shows`
164			`<B`
165			`CLASS="COMMAND"`
166			`><TT`
167			`CLASS="REPLACEABLE"`
168			`><I`
169			`>TARGET-</I`
170			`></TT`
171			`>gcc</B`
172			`>`
173			`you should use the full name of the cross compiler,`
174			`e.g. <B`
175			`CLASS="COMMAND"`
176			`>i386-elf-gcc</B`
177			`>,`
178			`<B`
179			`CLASS="COMMAND"`
180			`>arm-elf-gcc</B`
181			`>, or`
182			`<B`
183			`CLASS="COMMAND"`
184			`>sh-elf-gcc</B`
185			`>. When compiling for the`
186			`synthetic Linux target, use the native`
187			`<B`
188			`CLASS="COMMAND"`
189			`>gcc</B`
190			`> which must have the features`
191			`required by <SPAN`
192			`CLASS="PRODUCTNAME"`
193			`>eCos</SPAN`
194			`>.</P`
195			`></BLOCKQUOTE`
196			`></DIV`
197			`><TABLE`
198			`BORDER="5"`
199			`BGCOLOR="#E0E0F0"`
200			`WIDTH="70%"`
201			`><TR`
202			`><TD`
203			`><PRE`
204			`CLASS="SCREEN"`
205			`>$ <TT`
206			`CLASS="REPLACEABLE"`
207			`><I`
208			`>TARGET-</I`
209			`></TT`
210			`>gcc -c -I<SPAN`
211			`CLASS="emphasis"`
212			`><I`
213			`CLASS="EMPHASIS"`
214			`>INSTALL_DIR</I`
215			`></SPAN`
216			`>/include file.c`
217			`$ <TT`
218			`CLASS="REPLACEABLE"`
219			`><I`
220			`>TARGET-</I`
221			`></TT`
222			`>gcc -o program file.o -L<SPAN`
223			`CLASS="emphasis"`
224			`><I`
225			`CLASS="EMPHASIS"`
226			`>INSTALL_DIR</I`
227			`></SPAN`
228			`>/lib -Ttarget.ld -nostdlib</PRE`
229			`></TD`
230			`></TR`
231			`></TABLE`
232			`><DIV`
233			`CLASS="NOTE"`
234			`><BLOCKQUOTE`
235			`CLASS="NOTE"`
236			`><P`
237			`><B`
238			`>Note: </B`
239			`>Certain targets may require extra options, for example`
240			`the SPARClite architectures require the option`
241			`<TT`
242			`CLASS="OPTION"`
243			`>-mcpu=sparclite</TT`
244			`>. Examine the`
245			`<TT`
246			`CLASS="FILENAME"`
247			`><TT`
248			`CLASS="REPLACEABLE"`
249			`><I`
250			`>BASE_DIR</I`
251			`></TT`
252			`>/examples/Makefile</TT`
253			`>`
254			`or the “Global compiler flags” option`
255			`(CYGBLD_GLOBAL_CFLAGS) in your generated`
256			`<SPAN`
257			`CLASS="PRODUCTNAME"`
258			`>eCos</SPAN`
259			`> configuration) to see if any extra options are`
260			`required, and if so, what they are. </P`
261			`><P`
262			`>The following command lines use some other options`
263			`which are recommended because they use the`
264			`selective linking feature:</P`
265			`><TABLE`
266			`BORDER="5"`
267			`BGCOLOR="#E0E0F0"`
268			`WIDTH="70%"`
269			`><TR`
270			`><TD`
271			`><PRE`
272			`CLASS="SCREEN"`
273			`>$ <TT`
274			`CLASS="REPLACEABLE"`
275			`><I`
276			`>TARGET-</I`
277			`></TT`
278			`>gcc -c -I<TT`
279			`CLASS="REPLACEABLE"`
280			`><I`
281			`>INSTALL_DIR</I`
282			`></TT`
283			`>/include -I. -ffunction-sections -fdata-sections -g -O2 file.c`
284			`$ <TT`
285			`CLASS="REPLACEABLE"`
286			`><I`
287			`>TARGET-</I`
288			`></TT`
289			`>gcc -o program file.o -ffunction-sections -fdata-sections -Wl,--gc-sections -g -O2 \`
290			`-L<TT`
291			`CLASS="REPLACEABLE"`
292			`><I`
293			`>INSTALL_DIR</I`
294			`></TT`
295			`>/lib -Ttarget.ld -nostdlib</PRE`
296			`></TD`
297			`></TR`
298			`></TABLE`
299			`></BLOCKQUOTE`
300			`></DIV`
301			`></DIV`
302			`></DIV`
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315			`WIDTH="33%"`
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329			`ACCESSKEY="H"`
330			`>Home</A`
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339			`>Next</A`
340			`></TD`
341			`></TR`
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347			`>Application Build Tree</TD`
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354			`ACCESSKEY="U"`
355			`>Up</A`
356			`></TD`
357			`><TD`
358			`WIDTH="33%"`
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361			`>Compiling a C++ Application</TD`
362			`></TR`
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366			`></HTML`
367			`>`

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