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[karo-tx-redboot.git] / doc / html / user-guide / compiler-and-linker-options.html
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-<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
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->Compiler and Linker Options</TITLE
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-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 &#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
-></TR
-></TABLE
-></BLOCKQUOTE
-></DIV
-></DIV
-></DIV
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-WIDTH="100%"><TABLE
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