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>Compiling a C++ Application</TITLE
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><A
NAME="COMPILING-CPP-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
>g++</B
>
	    you should use the full name of the cross compiler,
	    e.g. <B
CLASS="COMMAND"
>i386-elf-g++</B
>,
	    <B
CLASS="COMMAND"
>arm-elf-g++</B
>, or
	    <B
CLASS="COMMAND"
>sh-elf-g++</B
>. When compiling for the
	    synthetic Linux target, use the native
	    <B
CLASS="COMMAND"
>g++</B
> which must have the features
	    required by <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
>.</P
></BLOCKQUOTE
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><TABLE
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><TR
><TD
><PRE
CLASS="SCREEN"
>$ <TT
CLASS="REPLACEABLE"
><I
>TARGET-</I
></TT
>g++ -c  -I<TT
CLASS="REPLACEABLE"
><I
>INSTALL_DIR</I
></TT
>/include -fno-rtti -fno-exceptions file.cxx
$ <TT
CLASS="REPLACEABLE"
><I
>TARGET-</I
></TT
>g++ -o program file.o -L<TT
CLASS="REPLACEABLE"
><I
>INSTALL_DIR</I
></TT
>/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
>/packages/targets</TT
>
	    file or <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
	    <I
CLASS="FIRSTTERM"
>selective linking</I
> feature:</P
><TABLE
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><TR
><TD
><PRE
CLASS="SCREEN"
>$ <TT
CLASS="REPLACEABLE"
><I
>TARGET-</I
></TT
>g++ -c -I<TT
CLASS="REPLACEABLE"
><I
>INSTALL_DIR</I
></TT
>/include -I. -ffunction-sections -fdata-sections -fno-rtti \
          -fno-exceptions -finit-priority -g -O2 file.cxx
$ <TT
CLASS="REPLACEABLE"
><I
>TARGET-</I
></TT
>g++ -o program file.o -W1,--gc-sections -g -O2 -L<TT
CLASS="REPLACEABLE"
><I
>INSTALL_DIR</I
></TT
>/lib -Ttarget.ld  -nostdlib</PRE
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