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>Chapter 26. Compiler and Linker Options</TD
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>Chapter 26. Compiler and Linker Options</TD
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><A
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NAME="COMPILING-CPP-APP">Compiling a C++ Application</H1
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NAME="COMPILING-CPP-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
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> 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++.
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> program written in C++.
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</P
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</P
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><DIV
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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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><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
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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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CLASS="COMMAND"
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CLASS="COMMAND"
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><TT
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><I
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>TARGET-</I
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>TARGET-</I
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>g++</B
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>g++</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-g++</B
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>i386-elf-g++</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-g++</B
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>arm-elf-g++</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-g++</B
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>sh-elf-g++</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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>g++</B
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>g++</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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CLASS="PRODUCTNAME"
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>eCos</SPAN
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>eCos</SPAN
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>.</P
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>.</P
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></BLOCKQUOTE
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><TR
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><TD
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><TD
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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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>g++ -c -I<TT
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>g++ -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 -fno-rtti -fno-exceptions file.cxx
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>/include -fno-rtti -fno-exceptions file.cxx
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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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>g++ -o program file.o -L<TT
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>g++ -o program file.o -L<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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>/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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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
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>Certain targets may require extra options,
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>Certain targets may require extra options,
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for example the SPARClite architectures require the option
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for example the SPARClite architectures require the option
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<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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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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>/packages/targets</TT
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>/packages/targets</TT
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>
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>
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file or <TT
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file or <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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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
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>
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>
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or the “Global compiler flags” option
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or the “Global compiler flags” option
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(CYGBLD_GLOBAL_CFLAGS) in your generated
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(CYGBLD_GLOBAL_CFLAGS) in your generated
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<SPAN
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<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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> configuration) to see if any extra options are
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> configuration) to see if any extra options are
|
required, and if so, what they are.</P
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required, and if so, what they are.</P
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><P
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><P
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>The following command lines use some other options
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>The following command lines use some other options
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which are recommended because they use the
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which are recommended because they use the
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<I
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<I
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CLASS="FIRSTTERM"
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CLASS="FIRSTTERM"
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>selective linking</I
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>selective linking</I
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> feature:</P
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> feature:</P
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><TD
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><TD
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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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>g++ -c -I<TT
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>g++ -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 -fno-rtti \
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>/include -I. -ffunction-sections -fdata-sections -fno-rtti \
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-fno-exceptions -finit-priority -g -O2 file.cxx
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-fno-exceptions -finit-priority -g -O2 file.cxx
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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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>g++ -o program file.o -W1,--gc-sections -g -O2 -L<TT
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>g++ -o program file.o -W1,--gc-sections -g -O2 -L<TT
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CLASS="REPLACEABLE"
|
CLASS="REPLACEABLE"
|
><I
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><I
|
>INSTALL_DIR</I
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>INSTALL_DIR</I
|
></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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></TD
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