+++ /dev/null
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->make_object</TITLE
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-TITLE="CDL Language Specification"
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-HREF="ref.make.html"><LINK
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-><H1
-><A
-NAME="REF.MAKE-OBJECT"><SPAN
-CLASS="PROPERTY"
->make_object</SPAN
-></H1
-><DIV
-CLASS="REFNAMEDIV"
-><A
-NAME="AEN4770"
-></A
-><H2
->Name</H2
->Property <SPAN
-CLASS="PROPERTY"
->make_object</SPAN
-> -- Define a custom build step, resulting in an object file
-that should go into a library.</DIV
-><DIV
-CLASS="REFSYNOPSISDIV"
-><A
-NAME="AEN4774"><H2
->Synopsis</H2
-><TABLE
-BORDER="5"
-BGCOLOR="#E0E0F0"
-WIDTH="70%"
-><TR
-><TD
-><PRE
-CLASS="SYNOPSIS"
->cdl_option <name> {
- make_object [-library=<library>] [-priority=<pri>] {
- <custom build step>
- }
- …
-}</PRE
-></TD
-></TR
-></TABLE
-></DIV
-><DIV
-CLASS="REFSECT1"
-><A
-NAME="AEN4776"
-></A
-><H2
->Description</H2
-><P
->When building an <SPAN
-CLASS="APPLICATION"
->eCos</SPAN
-> configuration the primary target is a single
-library, <TT
-CLASS="FILENAME"
->libtarget.a</TT
->. Most of the object files
-which go into this library will be generated as a result of <SPAN
-CLASS="PROPERTY"
->compile</SPAN
->
-properties. Occasionally it may be necessary to have special build
-steps for a given object file, and this can be achieved with a
-<SPAN
-CLASS="PROPERTY"
->make_object</SPAN
-> property. The use of this property should be avoided
-whenever possible because it greatly increases the risk of portability
-problems, both on the host side because of possible problems with the
-tools, and on the target side because a custom build step may not
-allow adequately for the wide variety of architectures supported by
-<SPAN
-CLASS="APPLICATION"
->eCos</SPAN
->.</P
-><P
->The <SPAN
-CLASS="PROPERTY"
->make_object</SPAN
-> property takes a single argument, which resembles a
-makefile rule: it consists of a target, a list of dependencies, and
-one or more commands that should be executed. The target should be an
-object file. However the <SPAN
-CLASS="PROPERTY"
->make_object</SPAN
-> argument is not a makefile
-fragment, and custom build steps may get executed in build
-environments that do not involve make. For full details of custom
-build steps see <A
-HREF="build.make.html#BUILD.CUSTOM"
->the Section called <I
->Custom Build Steps</I
-> in Chapter 4</A
->.</P
-><DIV
-CLASS="WARNING"
-><P
-></P
-><TABLE
-CLASS="WARNING"
-BORDER="1"
-WIDTH="100%"
-><TR
-><TD
-ALIGN="CENTER"
-><B
->Warning</B
-></TD
-></TR
-><TR
-><TD
-ALIGN="LEFT"
-><P
->The exact syntax and limitations of custom build steps have not yet
-been finalized, and may change in future versions of the
-configuration tools.</P
-></TD
-></TR
-></TABLE
-></DIV
-><P
->The <SPAN
-CLASS="PROPERTY"
->make_object</SPAN
-> property takes an optional library argument. If no
-library is specified then the default library for the current package
-will be used, which will be <TT
-CLASS="FILENAME"
->libtarget.a</TT
-> unless
-the <TT
-CLASS="LITERAL"
->cdl_package</TT
-> command contains a <SPAN
-CLASS="PROPERTY"
->library</SPAN
-> property.</P
-><P
->The <SPAN
-CLASS="PROPERTY"
->make_object</SPAN
-> property also takes an optional priority argument
-indicating the order in which build steps take place. This priority
-complements the dependency list, and avoids problems with packages
-needing to know details of custom build steps in other packages (which
-may change between releases). The defined order is:</P
-><P
-></P
-><DIV
-CLASS="VARIABLELIST"
-><DL
-><DT
->Priority 0</DT
-><DD
-><P
->The header files exported by the current set of packages are copied
-to the appropriate places in the
-<TT
-CLASS="FILENAME"
->include</TT
-> subdirectory of the
-install tree. Any unnecessary copies are avoided, to prevent rebuilds
-of package and application source modules caused by header file dependencies.</P
-><DIV
-CLASS="NOTE"
-><BLOCKQUOTE
-CLASS="NOTE"
-><P
-><B
->Note: </B
->A possible future enhancement of the build system may result in the
-build and install trees being updated automatically if there has been
-a change to the <TT
-CLASS="FILENAME"
->ecos.ecc</TT
-> configuration savefile.</P
-></BLOCKQUOTE
-></DIV
-></DD
-><DT
->Priority 100</DT
-><DD
-><P
->All files specified in <SPAN
-CLASS="PROPERTY"
->compile</SPAN
-> properties will get built, producing
-the corresponding object files. In addition any custom build steps
-defined by <SPAN
-CLASS="PROPERTY"
->make_object</SPAN
-> properties get executed, unless there is a
-<TT
-CLASS="LITERAL"
->-priority=</TT
-> option.</P
-></DD
-><DT
->Priority 200</DT
-><DD
-><P
->The libraries now get built using the appropriate object files.</P
-></DD
-><DT
->Priority 300</DT
-><DD
-><P
->Any custom build steps specified by <SPAN
-CLASS="PROPERTY"
->make</SPAN
-> properties now get
-executed, unless the priority for a particular build step is changed
-from its default.</P
-></DD
-></DL
-></DIV
-><P
->For example, if a custom build step needs to take place before any of
-the normal source files get compiled then it should be given a
-priority somewhere between 0 and 100. If a custom build step involves
-post-processing an object file prior to its incorporation into a
-library then a priority between 100 and 200 should be used. It is not
-sensible to have a priority above 200, since that would imply building
-an additional object file for a library that has already been created.</P
-></DIV
-><DIV
-CLASS="REFSECT1"
-><A
-NAME="AEN4823"
-></A
-><H2
->Example</H2
-><TABLE
-BORDER="5"
-BGCOLOR="#E0E0F0"
-WIDTH="70%"
-><TR
-><TD
-><PRE
-CLASS="PROGRAMLISTING"
->cdl_option XXX {
- …
- make_object {
- parser.o: parser.y
- yacc $<
- $(CC) $(CFLAGS) -o $@ y.tab.c
- }
-}</PRE
-></TD
-></TR
-></TABLE
-></DIV
-><DIV
-CLASS="REFSECT1"
-><A
-NAME="AEN4826"
-></A
-><H2
->See Also</H2
-><P
->Properties <A
-HREF="ref.compile.html"
->compile</A
->,
-<A
-HREF="ref.make.html"
->make</A
-> and
-<A
-HREF="ref.library.html"
->library</A
->.</P
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-><HR
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-SUMMARY="Footer navigation table"
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-VALIGN="top"
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->Prev</A
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