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>make</TITLE
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><TR
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><TH
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COLSPAN="3"
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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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><HR
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><H1
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><A
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NAME="REF.MAKE"><SPAN
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CLASS="PROPERTY"
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>make</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="AEN4710"
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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</SPAN
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>&nbsp;--&nbsp;Define an additional custom build step associated with an
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option, resulting in a target that should not go directly 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="AEN4714"><H2
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>Synopsis</H2
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><TABLE
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BORDER="5"
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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 [-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="AEN4716"
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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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>. In some cases it is
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necessary to build some additional targets. For example architectural
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HAL packages typically build a linker script and some start-up code.
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Such additional targets can be specified by a <SPAN
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CLASS="PROPERTY"
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>make</SPAN
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> property. Any
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option can have one or more <SPAN
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CLASS="PROPERTY"
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>make</SPAN
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> properties, although typically such
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properties only occur in the body of a <TT
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CLASS="LITERAL"
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>cdl_package</TT
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> command.</P
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><P
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>The <SPAN
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CLASS="PROPERTY"
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>make</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. However the argument is
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not a makefile fragment, and custom build steps may get executed in
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build environments that do not involve make. For full details of
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custom 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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>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 are subject to 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</SPAN
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> property takes an optional priority argument indicating the
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order in which build steps take place. This priority complements the
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dependency list, and avoids problems with packages needing to know
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details of custom build steps in other packages (which may change
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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
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a <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.</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="AEN4757"
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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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BORDER="5"
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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="PROGRAMLISTING"
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>cdl_package CYGPKG_HAL_MN10300_AM33 {
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    display       "MN10300 AM33 variant"
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    parent        CYGPKG_HAL_MN10300
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    implements    CYGINT_HAL_MN10300_VARIANT
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    hardware
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    include_dir   cyg/hal
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    define_header hal_mn10300_am33.h
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    description   "
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           The MN10300 AM33 variant HAL package provides generic
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           support for this processor architecture. It is also
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           necessary to select a specific target platform HAL
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           package."
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    make {
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        &lt;PREFIX&gt;/lib/target.ld: &lt;PACKAGE&gt;/src/mn10300_am33.ld
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        $(CC) -E -P -Wp,-MD,target.tmp -DEXTRAS=1 -xc $(INCLUDE_PATH) $(CFLAGS) -o $@ $&lt;
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        @echo $@ ": \\" &gt; $(notdir $@).deps
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        @tail +2 target.tmp &gt;&gt; $(notdir $@).deps
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        @echo &gt;&gt; $(notdir $@).deps
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        @rm target.tmp
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    }
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}</PRE
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CLASS="REFSECT1"
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><A
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NAME="AEN4760"
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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-object.html"
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>make_object</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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