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NAME="COMPILER-AND-LINKER-OPTIONS">Chapter 26. Compiler and Linker Options</H1
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NAME="COMPILER-AND-LINKER-OPTIONS">Chapter 26. Compiler and Linker Options</H1
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><A
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><A
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HREF="compiler-and-linker-options.html#COMPILING-C-APP"
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HREF="compiler-and-linker-options.html#COMPILING-C-APP"
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>Compiling a C Application</A
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>Compiling a C Application</A
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><A
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>Compiling a C++ Application</A
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>Compiling a C++ Application</A
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CLASS="PRODUCTNAME"
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CLASS="PRODUCTNAME"
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>eCos</SPAN
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>eCos</SPAN
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> is built using
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> is built using
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the GNU C and C++ compilers. <SPAN
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the GNU C and C++ compilers. <SPAN
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CLASS="PRODUCTNAME"
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CLASS="PRODUCTNAME"
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>eCos</SPAN
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>eCos</SPAN
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> relies on certain features of these
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> relies on certain features of these
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tools such as constructor priority ordering and selective linking
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tools such as constructor priority ordering and selective linking
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which are not part of other toolchains.
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which are not part of other toolchains.
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</P
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</P
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><P
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><P
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>Some <SPAN
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>Some <SPAN
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CLASS="APPLICATION"
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CLASS="APPLICATION"
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>GCC</SPAN
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>GCC</SPAN
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> options are required for <SPAN
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> options are required for <SPAN
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CLASS="PRODUCTNAME"
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CLASS="PRODUCTNAME"
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>eCos</SPAN
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>eCos</SPAN
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>,
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>,
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and others can be useful. This chapter gives a brief description
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and others can be useful. This chapter gives a brief description
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of the required options as well as some recommended <SPAN
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of the required options as well as some recommended <SPAN
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CLASS="PRODUCTNAME"
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CLASS="PRODUCTNAME"
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>eCos</SPAN
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>eCos</SPAN
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>-specific options.
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>-specific options.
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All other <SPAN
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All other <SPAN
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CLASS="APPLICATION"
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CLASS="APPLICATION"
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>GCC</SPAN
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>GCC</SPAN
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> options (described in the <SPAN
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> options (described in the <SPAN
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CLASS="APPLICATION"
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CLASS="APPLICATION"
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>GCC</SPAN
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>GCC</SPAN
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> manuals)
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> manuals)
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are available. </P
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are available. </P
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><DIV
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><DIV
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CLASS="SECT1"
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><H1
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><H1
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CLASS="SECT1"
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CLASS="SECT1"
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><A
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><A
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NAME="COMPILING-C-APP">Compiling a C Application</H1
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NAME="COMPILING-C-APP">Compiling a C Application</H1
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><P
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><P
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>The following command lines demonstrate the
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>The following command lines demonstrate the
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<SPAN
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<SPAN
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CLASS="emphasis"
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CLASS="emphasis"
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><I
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><I
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CLASS="EMPHASIS"
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CLASS="EMPHASIS"
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>minimum</I
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>minimum</I
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></SPAN
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></SPAN
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> set of options required to
|
> set of options required to
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compile and link an <SPAN
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compile and link an <SPAN
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CLASS="PRODUCTNAME"
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CLASS="PRODUCTNAME"
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>eCos</SPAN
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>eCos</SPAN
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> program written in C. </P
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> program written in C. </P
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><DIV
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CLASS="NOTE"
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><B
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>Note: </B
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>Note: </B
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>Remember that when this manual shows
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>Remember that when this manual shows
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<B
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<B
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><I
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><I
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>TARGET-</I
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>TARGET-</I
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></TT
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></TT
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>gcc</B
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>gcc</B
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>
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>
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you should use the full name of the cross compiler,
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you should use the full name of the cross compiler,
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e.g. <B
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e.g. <B
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CLASS="COMMAND"
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CLASS="COMMAND"
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>i386-elf-gcc</B
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>i386-elf-gcc</B
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>,
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>,
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<B
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<B
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CLASS="COMMAND"
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CLASS="COMMAND"
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>arm-elf-gcc</B
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>arm-elf-gcc</B
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>, or
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>, or
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<B
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<B
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CLASS="COMMAND"
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CLASS="COMMAND"
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>sh-elf-gcc</B
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>sh-elf-gcc</B
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>. When compiling for the
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>. When compiling for the
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synthetic Linux target, use the native
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synthetic Linux target, use the native
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<B
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<B
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CLASS="COMMAND"
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CLASS="COMMAND"
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>gcc</B
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>gcc</B
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> which must have the features
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> which must have the features
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required by <SPAN
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required by <SPAN
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CLASS="PRODUCTNAME"
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>eCos</SPAN
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><PRE
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><PRE
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CLASS="SCREEN"
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CLASS="SCREEN"
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>$ <TT
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>$ <TT
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CLASS="REPLACEABLE"
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CLASS="REPLACEABLE"
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><I
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><I
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>TARGET-</I
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>TARGET-</I
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></TT
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></TT
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>gcc -c -I<SPAN
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>gcc -c -I<SPAN
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CLASS="emphasis"
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CLASS="emphasis"
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><I
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><I
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CLASS="EMPHASIS"
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>INSTALL_DIR</I
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>INSTALL_DIR</I
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></SPAN
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></SPAN
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>/include file.c
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>/include file.c
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$ <TT
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$ <TT
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><I
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><I
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>TARGET-</I
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>TARGET-</I
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></TT
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></TT
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>gcc -o program file.o -L<SPAN
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>gcc -o program file.o -L<SPAN
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CLASS="emphasis"
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CLASS="emphasis"
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><I
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><I
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CLASS="EMPHASIS"
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>INSTALL_DIR</I
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>INSTALL_DIR</I
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></SPAN
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></SPAN
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>/lib -Ttarget.ld -nostdlib</PRE
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>/lib -Ttarget.ld -nostdlib</PRE
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></TD
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></TD
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></TR
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></TABLE
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><DIV
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CLASS="NOTE"
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CLASS="NOTE"
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><BLOCKQUOTE
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><BLOCKQUOTE
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CLASS="NOTE"
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CLASS="NOTE"
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><P
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><P
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><B
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><B
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>Note: </B
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>Note: </B
|
>Certain targets may require extra options, for example
|
>Certain targets may require extra options, for example
|
the SPARClite architectures require the option
|
the SPARClite architectures require the option
|
<TT
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<TT
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CLASS="OPTION"
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CLASS="OPTION"
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>-mcpu=sparclite</TT
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>-mcpu=sparclite</TT
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>. Examine the
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>. Examine the
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<TT
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<TT
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CLASS="FILENAME"
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CLASS="FILENAME"
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><TT
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><TT
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CLASS="REPLACEABLE"
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><I
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><I
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>BASE_DIR</I
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>BASE_DIR</I
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></TT
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></TT
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>/examples/Makefile</TT
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>/examples/Makefile</TT
|
>
|
>
|
or the “Global compiler flags” option
|
or the “Global compiler flags” option
|
(CYGBLD_GLOBAL_CFLAGS) in your generated
|
(CYGBLD_GLOBAL_CFLAGS) in your generated
|
<SPAN
|
<SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
> configuration) to see if any extra options are
|
> configuration) to see if any extra options are
|
required, and if so, what they are. </P
|
required, and if so, what they are. </P
|
><P
|
><P
|
>The following command lines use some other options
|
>The following command lines use some other options
|
which are recommended because they use the
|
which are recommended because they use the
|
selective linking feature:</P
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selective linking feature:</P
|
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CLASS="SCREEN"
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>$ <TT
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>$ <TT
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CLASS="REPLACEABLE"
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><I
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><I
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>TARGET-</I
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>TARGET-</I
|
></TT
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></TT
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>gcc -c -I<TT
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CLASS="REPLACEABLE"
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CLASS="REPLACEABLE"
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><I
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><I
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>INSTALL_DIR</I
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>INSTALL_DIR</I
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></TT
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></TT
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>/include -I. -ffunction-sections -fdata-sections -g -O2 file.c
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>/include -I. -ffunction-sections -fdata-sections -g -O2 file.c
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$ <TT
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$ <TT
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CLASS="REPLACEABLE"
|
CLASS="REPLACEABLE"
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><I
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><I
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>TARGET-</I
|
>TARGET-</I
|
></TT
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></TT
|
>gcc -o program file.o -ffunction-sections -fdata-sections -Wl,--gc-sections -g -O2 \
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>gcc -o program file.o -ffunction-sections -fdata-sections -Wl,--gc-sections -g -O2 \
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-L<TT
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-L<TT
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CLASS="REPLACEABLE"
|
CLASS="REPLACEABLE"
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><I
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><I
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>INSTALL_DIR</I
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>INSTALL_DIR</I
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></TT
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></TT
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>/lib -Ttarget.ld -nostdlib</PRE
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>/lib -Ttarget.ld -nostdlib</PRE
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