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>Building the System</TITLE
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>eCos User Guide</TH
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>eCos User Guide</TH
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WIDTH="80%"
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VALIGN="bottom"
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>Chapter 28. Manual Configuration</TD
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>Chapter 28. Manual Configuration</TD
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><TD
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><TD
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WIDTH="10%"
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WIDTH="10%"
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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="BUILDING-THE-SYSTEM">Building the System</H1
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NAME="BUILDING-THE-SYSTEM">Building the System</H1
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><P
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><P
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>Once a build tree has been generated with
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>Once a build tree has been generated with
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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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>ecosconfig</B
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>ecosconfig</B
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>, building <SPAN
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>, building <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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> is straightforward:</P
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> is straightforward:</P
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><TABLE
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><TR
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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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>$ make</PRE
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>$ make</PRE
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></TD
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></TD
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></TR
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></TR
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></TABLE
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></TABLE
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><P
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><P
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>The build tree contains the subdirectories, makefiles,
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>The build tree contains the subdirectories, makefiles,
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and everything else that is needed to generate the default
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and everything else that is needed to generate the default
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configuration for the selected architecture and platform.
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configuration for the selected architecture and platform.
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The only requirement is that the tools needed for that
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The only requirement is that the tools needed for that
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architecture, for example
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architecture, for example
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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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>powerpc-eabi-g++</B
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>powerpc-eabi-g++</B
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>,
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>,
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are available using the standard search path. If this is not
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are available using the standard search path. If this is not
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the case then the <B
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the case then the <B
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CLASS="COMMAND"
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CLASS="COMMAND"
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>make</B
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>make</B
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> will
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> will
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fail with an error message. If you have a multiprocessor
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fail with an error message. If you have a multiprocessor
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system then it may be more efficient to use:</P
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system then it may be more efficient to use:</P
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><TABLE
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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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>$ make -j <TT
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>$ make -j <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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>n</I
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>n</I
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></TT
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></TT
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></PRE
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></PRE
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></TD
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></TD
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></TR
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></TR
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></TABLE
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></TABLE
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><P
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><P
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>where <TT
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>where <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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>n</I
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>n</I
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></TT
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></TT
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> is equal to the
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> is equal to the
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number of processors on your system.</P
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number of processors on your system.</P
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><P
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><P
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>Once the <B
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>Once the <B
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CLASS="COMMAND"
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CLASS="COMMAND"
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>make</B
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>make</B
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> process
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> process
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has completed, the install tree will contain the header
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has completed, the install tree will contain the header
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files and the target library that are needed for application
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files and the target library that are needed for application
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development. </P
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development. </P
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><P
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><P
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>It is also possible to build the system’s test cases
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>It is also possible to build the system’s test cases
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for the current configuration:</P
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for the current configuration:</P
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><TABLE
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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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>$ make tests</PRE
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>$ make tests</PRE
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></TD
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></TD
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></TR
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></TR
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></TABLE
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></TABLE
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><P
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><P
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>The resulting test executables will end up in a
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>The resulting test executables will end up in a
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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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>tests</TT
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>tests</TT
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> subdirectory of the
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> subdirectory of the
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install tree. </P
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install tree. </P
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><P
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><P
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>If disk space is scarce then it is possible to make the copy
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>If disk space is scarce then it is possible to make the copy
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of the install tree for application development purposes, and then
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of the install tree for application development purposes, and then
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use: </P
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use: </P
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><TABLE
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WIDTH="70%"
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><TR
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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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>$ make clean</PRE
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>$ make clean</PRE
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></TD
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></TD
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></TR
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></TR
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></TABLE
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></TABLE
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><P
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><P
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>The build tree will now use up a minimum of disk space — the
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>The build tree will now use up a minimum of disk space — the
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bulk of what is left consists of configuration header files that
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bulk of what is left consists of configuration header files that
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you may have edited and hence should not be deleted automatically.
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you may have edited and hence should not be deleted automatically.
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However, it is possible to rebuild the system at any time without
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However, it is possible to rebuild the system at any time without
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re-invoking <B
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re-invoking <B
|
CLASS="COMMAND"
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CLASS="COMMAND"
|
>ecosconfig</B
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>ecosconfig</B
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>, just by
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>, just by
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running <B
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running <B
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CLASS="COMMAND"
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CLASS="COMMAND"
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>make</B
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>make</B
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> again. </P
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> again. </P
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><P
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><P
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>Under exceptional circumstances it may be necessary to run <B
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>Under exceptional circumstances it may be necessary to run <B
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CLASS="COMMAND"
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CLASS="COMMAND"
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>make
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>make
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clean</B
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clean</B
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> for other reasons, such as when a new release
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> for other reasons, such as when a new release
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of the toolchain is installed. The toolchain includes a number of
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of the toolchain is installed. The toolchain includes a number of
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header files which are closely tied to the compiler, for example <TT
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header files which are closely tied to the compiler, for example <TT
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CLASS="FILENAME"
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CLASS="FILENAME"
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>limits.h</TT
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>limits.h</TT
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>,
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>,
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and these header files are not and should not be duplicated by <SPAN
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and these header files are not and should not be duplicated by <SPAN
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CLASS="PRODUCTNAME"
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CLASS="PRODUCTNAME"
|
>eCos</SPAN
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>eCos</SPAN
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>.
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>.
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The makefiles perform header file dependency analysis, so that when
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The makefiles perform header file dependency analysis, so that when
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a header file is changed all affected sources will be rebuilt during
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a header file is changed all affected sources will be rebuilt during
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the next <B
|
the next <B
|
CLASS="COMMAND"
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CLASS="COMMAND"
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>make</B
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>make</B
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>. This is very useful
|
>. This is very useful
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when the configuration header files are changed, but it also means
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when the configuration header files are changed, but it also means
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that a build tree containing information about the locations of
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that a build tree containing information about the locations of
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header files must be rebuilt. If a new version of the toolchain
|
header files must be rebuilt. If a new version of the toolchain
|
is installed and the old version is removed then this location information
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is installed and the old version is removed then this location information
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is no longer accurate, and <B
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is no longer accurate, and <B
|
CLASS="COMMAND"
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CLASS="COMMAND"
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>make</B
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>make</B
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> will
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> will
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complain that certain dependencies cannot be satisfied. Under such circumstances
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complain that certain dependencies cannot be satisfied. Under such circumstances
|
it is necessary to do a <B
|
it is necessary to do a <B
|
CLASS="COMMAND"
|
CLASS="COMMAND"
|
>make clean</B
|
>make clean</B
|
> first. </P
|
> first. </P
|
></DIV
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>Prev</A
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>Conflicts and constraints</TD
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>Conflicts and constraints</TD
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><TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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>Up</A
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>Up</A
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>Packages</TD
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>Packages</TD
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