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+>Compiler and Linker Options</TITLE
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+TITLE="eCos Programming Concepts and Techniques"
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+TITLE="Application Build Tree"
+HREF="repository-app-build-tree.html"><LINK
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+TITLE="Compiling a C++ Application"
+HREF="compiling-cpp-app.html"></HEAD
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+>eCos User Guide</TH
+></TR
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+>Next</A
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+><HR
+ALIGN="LEFT"
+WIDTH="100%"></DIV
+><DIV
+CLASS="CHAPTER"
+><H1
+><A
+NAME="COMPILER-AND-LINKER-OPTIONS">Chapter 26. Compiler and Linker Options</H1
+><DIV
+CLASS="TOC"
+><DL
+><DT
+><B
+>Table of Contents</B
+></DT
+><DT
+><A
+HREF="compiler-and-linker-options.html#COMPILING-C-APP"
+>Compiling a C Application</A
+></DT
+><DT
+><A
+HREF="compiling-cpp-app.html"
+>Compiling a C++ Application</A
+></DT
+></DL
+></DIV
+><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
+></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 “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
+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
+></TR
+></TABLE
+></BLOCKQUOTE
+></DIV
+></DIV
+></DIV
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