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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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><H1
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><A
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NAME="REF.COMPILE"><SPAN
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CLASS="PROPERTY"
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>compile</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="AEN3815"
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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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>compile</SPAN
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>&nbsp;--&nbsp;List the source files that should be built if this option
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is active and enabled.</DIV
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><DIV
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CLASS="REFSYNOPSISDIV"
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><A
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NAME="AEN3819"><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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    compile [-library=libxxx.a] &lt;list of files&gt;
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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="AEN3821"
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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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>The <SPAN
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CLASS="PROPERTY"
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>compile</SPAN
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> property allows component developers to specify source
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files which should be compiled and added to one of the target
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libraries. Usually each source file will end up the library
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<TT
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CLASS="FILENAME"
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>libtarget.a</TT
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>. It is possible for component writers
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to specify an alternative library for an entire package using the
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<A
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HREF="ref.library.html"
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><SPAN
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CLASS="PROPERTY"
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>library</SPAN
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></A
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> property. Alternatively
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the desired library can be specified on the <SPAN
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CLASS="PROPERTY"
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>compile</SPAN
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> line itself. For
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example, to add a particular source file to the
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<TT
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CLASS="FILENAME"
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>libextras.a</TT
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> library the following could be used:</P
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><TABLE
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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_IO_SERIAL {
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    &#8230;
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    compile -library=libextras.a common/tty.c
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}</PRE
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></TD
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></TR
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></TABLE
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><P
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>Details of the build process including such issues as compiler flags
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and the order in which things happen can be found in
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<A
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HREF="build.html"
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>Chapter 4</A
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>. </P
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><P
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><SPAN
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CLASS="PROPERTY"
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>compile</SPAN
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> properties can occur in any of <TT
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CLASS="LITERAL"
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>cdl_option</TT
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>,
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<TT
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CLASS="LITERAL"
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>cdl_component</TT
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>, <TT
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CLASS="LITERAL"
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>cdl_package</TT
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> or <TT
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CLASS="LITERAL"
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>cdl_interface</TT
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>. A <SPAN
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CLASS="PROPERTY"
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>compile</SPAN
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>
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property has effect if and only if the entity that contains it is
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active and enabled. Typically the body of a <TT
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CLASS="LITERAL"
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>cdl_package</TT
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> will define
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any source files that need to be built irrespective of individual
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options, and each <TT
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CLASS="LITERAL"
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>cdl_component</TT
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>, <TT
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CLASS="LITERAL"
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>cdl_option</TT
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>, and <TT
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CLASS="LITERAL"
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>cdl_interface</TT
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>
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will define source files that are more specific. A single <SPAN
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CLASS="PROPERTY"
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>compile</SPAN
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>
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property can list any number of source files, all destined for the
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same library. A <TT
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CLASS="LITERAL"
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>cdl_option</TT
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> or other entity can contain multiple
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<SPAN
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CLASS="PROPERTY"
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>compile</SPAN
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> properties, each of which can specify a different library.
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It is possible for a given source file to be specified in <SPAN
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CLASS="PROPERTY"
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>compile</SPAN
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>
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properties for several different options, in which case the source
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file will get built if any of these options are active and enabled.</P
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><P
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>If the package follows the <A
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HREF="package.html#PACKAGE.HIERARCHY"
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>directory
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layout conventions</A
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> then the configuration tools will search for
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the specified source files first in the
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<TT
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CLASS="FILENAME"
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>src</TT
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> subdirectory of the
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package, then relative to the package directory itself. </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 shortcoming of the current specification of <SPAN
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CLASS="PROPERTY"
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>compile</SPAN
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> properties is
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that there is no easy way to specify source files that should be built
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unless an option is enabled. It would sometimes be useful to be able
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to say: &#8220;if option <TT
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CLASS="LITERAL"
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>A</TT
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> is enabled then compile
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file <TT
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CLASS="FILENAME"
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>x.c</TT
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>, otherwise compile file
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<TT
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CLASS="FILENAME"
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>y.c</TT
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>. There are two simple ways of achieving this: </P
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><P
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></P
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><UL
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><LI
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><P
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>Always compile <TT
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CLASS="FILENAME"
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>y.c</TT
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>, typically by listing it in
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the body of the <TT
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CLASS="LITERAL"
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>cdl_package</TT
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>, but use
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<TT
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CLASS="LITERAL"
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>#ifndef&nbsp;A</TT
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> to produce an empty object file if
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option <TT
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CLASS="LITERAL"
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>A</TT
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> is not enabled. This has the big
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disadvantage that the file always gets compiled and hence for some
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configurations builds will take longer than necessary.</P
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></LI
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><LI
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><P
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>Use a <SPAN
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CLASS="PROPERTY"
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>calculated</SPAN
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> option whose value is <TT
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CLASS="LITERAL"
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>!A</TT
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>, and
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have a <TT
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CLASS="LITERAL"
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>compile&nbsp;y.c</TT
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> property in its body. This
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has the big disadvantage of adding another calculated option to the
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configuration.</P
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></LI
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></UL
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><P
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>It is likely that this will be resolved in the future, possibly by
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using some sort of expression as the argument to a <SPAN
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CLASS="PROPERTY"
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>compile</SPAN
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> property.</P
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></BLOCKQUOTE
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></DIV
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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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>Currently it is not possible to control the priority of a <SPAN
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CLASS="PROPERTY"
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>compile</SPAN
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>
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property, in other words the order in which a file gets compiled
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relative to other build steps. This functionality might prove useful
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for complicated packages and should be added.</P
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></BLOCKQUOTE
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></DIV
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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="AEN3874"
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></A
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><H2
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>Example</H2
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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_INFRA {
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    display       "Infrastructure"
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    include_dir   cyg/infra
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    description   "
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        Common types and useful macros.
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        Tracing and assertion facilities.
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        Package startup options."
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    compile startup.cxx prestart.cxx pkgstart.cxx userstart.cxx \
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            dummyxxmain.cxx memcpy.c memset.c delete.cxx \
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            diag.cxx tcdiag.cxx
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}</PRE
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></TD
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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="AEN3877"
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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.make.html"
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>make</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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