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>make_object</TITLE
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>The <SPAN
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>eCos</SPAN
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> Component Writer's Guide</TH
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><TR
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><TD
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><A
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><H1
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><A
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NAME="REF.MAKE-OBJECT"><SPAN
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CLASS="PROPERTY"
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>make_object</SPAN
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></H1
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><DIV
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CLASS="REFNAMEDIV"
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><A
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NAME="AEN4770"
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></A
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><H2
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>Name</H2
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>Property <SPAN
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CLASS="PROPERTY"
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>make_object</SPAN
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>&nbsp;--&nbsp;Define a custom build step, resulting in an object file
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that should go into a library.</DIV
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><DIV
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CLASS="REFSYNOPSISDIV"
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><A
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NAME="AEN4774"><H2
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>Synopsis</H2
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><TABLE
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BGCOLOR="#E0E0F0"
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WIDTH="70%"
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><TR
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><TD
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><PRE
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CLASS="SYNOPSIS"
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>cdl_option &lt;name&gt; {
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    make_object [-library=&lt;library&gt;] [-priority=&lt;pri&gt;]  {
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        &lt;custom build step&gt;
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    }
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    &#8230;
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}</PRE
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></TD
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></TR
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></TABLE
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></DIV
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><DIV
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CLASS="REFSECT1"
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><A
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NAME="AEN4776"
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></A
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><H2
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>Description</H2
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><P
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>When building an <SPAN
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CLASS="APPLICATION"
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>eCos</SPAN
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> configuration the primary target is a single
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library, <TT
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CLASS="FILENAME"
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>libtarget.a</TT
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>. Most of the object files
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which go into this library will be generated as a result of <SPAN
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CLASS="PROPERTY"
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>compile</SPAN
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>
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properties. Occasionally it may be necessary to have special build
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steps for a given object file, and this can be achieved with a
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<SPAN
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CLASS="PROPERTY"
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>make_object</SPAN
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> property. The use of this property should be avoided
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whenever possible because it greatly increases the risk of portability
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problems, both on the host side because of possible problems with the
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tools, and on the target side because a custom build step may not
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allow adequately for the wide variety of architectures supported by
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<SPAN
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CLASS="APPLICATION"
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>eCos</SPAN
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>.</P
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><P
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>The <SPAN
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CLASS="PROPERTY"
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>make_object</SPAN
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> property takes a single argument, which resembles a
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makefile rule: it consists of a target, a list of dependencies, and
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one or more commands that should be executed. The target should be an
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object file. However the <SPAN
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CLASS="PROPERTY"
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>make_object</SPAN
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> argument is not a makefile
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fragment, and custom build steps may get executed in build
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environments that do not involve make. For full details of custom
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build steps see <A
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HREF="build.make.html#BUILD.CUSTOM"
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>the Section called <I
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>Custom Build Steps</I
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> in Chapter 4</A
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>.</P
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><DIV
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CLASS="WARNING"
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><P
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></P
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><TABLE
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CLASS="WARNING"
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BORDER="1"
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WIDTH="100%"
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><TR
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><TD
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ALIGN="CENTER"
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><B
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>Warning</B
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></TD
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></TR
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><TR
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><TD
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ALIGN="LEFT"
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><P
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>The exact syntax and limitations of custom build steps have not yet
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been finalized, and may change in future versions of the
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configuration tools.</P
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></TD
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></TR
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></TABLE
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></DIV
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><P
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>The <SPAN
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CLASS="PROPERTY"
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>make_object</SPAN
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> property takes an optional library argument. If no
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library is specified then the default library for the current package
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will be used, which will be <TT
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CLASS="FILENAME"
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>libtarget.a</TT
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> unless
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the <TT
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CLASS="LITERAL"
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>cdl_package</TT
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> command contains a <SPAN
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CLASS="PROPERTY"
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>library</SPAN
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> property.</P
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><P
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>The <SPAN
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CLASS="PROPERTY"
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>make_object</SPAN
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> property also takes an optional priority argument
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indicating the order in which build steps take place. This priority
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complements the dependency list, and avoids problems with packages
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needing to know details of custom build steps in other packages (which
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may change between releases). The defined order is:</P
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><P
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></P
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><DIV
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CLASS="VARIABLELIST"
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><DL
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><DT
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>Priority 0</DT
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><DD
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><P
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>The header files exported by the current set of packages are copied
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to the appropriate places in the
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<TT
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CLASS="FILENAME"
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>include</TT
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> subdirectory of the
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install tree. Any unnecessary copies are avoided, to prevent rebuilds
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of package and application source modules caused by header file dependencies.</P
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><DIV
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CLASS="NOTE"
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><BLOCKQUOTE
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CLASS="NOTE"
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><P
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><B
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>Note: </B
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>A possible future enhancement of the build system may result in the
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build and install trees being updated automatically if there has been
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a change to the <TT
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CLASS="FILENAME"
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>ecos.ecc</TT
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> configuration savefile.</P
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></BLOCKQUOTE
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></DIV
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></DD
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><DT
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>Priority 100</DT
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><DD
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><P
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>All files specified in <SPAN
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CLASS="PROPERTY"
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>compile</SPAN
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> properties will get built, producing
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the corresponding object files. In addition any custom build steps
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defined by <SPAN
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CLASS="PROPERTY"
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>make_object</SPAN
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> properties get executed, unless there is a
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<TT
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CLASS="LITERAL"
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>-priority=</TT
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> option.</P
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></DD
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><DT
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>Priority 200</DT
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><DD
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><P
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>The libraries now get built using the appropriate object files.</P
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></DD
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><DT
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>Priority 300</DT
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><DD
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><P
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>Any custom build steps specified by <SPAN
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CLASS="PROPERTY"
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>make</SPAN
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> properties now get
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executed, unless the priority for a particular build step is changed
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from its default.</P
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></DD
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></DL
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></DIV
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><P
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>For example, if a custom build step needs to take place before any of
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the normal source files get compiled then it should be given a
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priority somewhere between 0 and 100. If a custom build step involves
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post-processing an object file prior to its incorporation into a
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library then a priority between 100 and 200 should be used. It is not
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sensible to have a priority above 200, since that would imply building
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an additional object file for a library that has already been created.</P
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></DIV
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><DIV
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CLASS="REFSECT1"
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><A
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NAME="AEN4823"
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></A
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><H2
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>Example</H2
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><TABLE
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BGCOLOR="#E0E0F0"
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><TR
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><TD
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><PRE
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CLASS="PROGRAMLISTING"
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>cdl_option XXX {
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    &#8230;
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    make_object {
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        parser.o: parser.y
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                yacc $&lt;
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                $(CC) $(CFLAGS) -o $@ y.tab.c
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    }
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}</PRE
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></TD
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><DIV
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CLASS="REFSECT1"
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><A
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NAME="AEN4826"
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></A
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><H2
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>See Also</H2
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><P
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>Properties <A
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HREF="ref.compile.html"
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>compile</A
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>,
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<A
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HREF="ref.make.html"
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>make</A
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> and
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<A
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HREF="ref.library.html"
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>library</A
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>.</P
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