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>Compiler and Linker Options</TITLE
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><DIV
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><H1
><A
NAME="COMPILER-AND-LINKER-OPTIONS">Chapter 26. Compiler and Linker Options</H1
><DIV
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><DL
><DT
><B
>Table of Contents</B
></DT
><DT
><A
HREF="compiler-and-linker-options.html#COMPILING-C-APP"
>Compiling a C Application</A
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><DT
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>Compiling a C++ Application</A
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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"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><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
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></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 “Global compiler flags” 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
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><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
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