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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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><H1
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><A
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NAME="REF.CDL-PACKAGE"><TT
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CLASS="LITERAL"
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>cdl_package</TT
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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="AEN3272"
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></A
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><H2
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>Name</H2
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>Command <TT
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CLASS="LITERAL"
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>cdl_package</TT
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>&nbsp;--&nbsp;Define a package, a component that can be distributed</DIV
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><DIV
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CLASS="REFSYNOPSISDIV"
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><A
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NAME="AEN3276"><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_package &lt;name&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="AEN3278"
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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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>A package is a unit of distribution. It is also a configuration option
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in that users can choose whether or not a particular package is loaded
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into the configuration, and which version of that package should be
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loaded. It is also a component in that it can contain additional
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components and options in a hierarchy.</P
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><P
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>The top-level <SPAN
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CLASS="APPLICATION"
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>CDL</SPAN
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> script for a package should begin with a <TT
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CLASS="LITERAL"
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>cdl_package</TT
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>
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command. This can contain most of the properties that can be used in a
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<TT
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CLASS="LITERAL"
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>cdl_option</TT
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> command, and a number of additional ones which apply to a
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package as a whole. It is also possible to include <TT
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CLASS="LITERAL"
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>cdl_component</TT
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>,
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<TT
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CLASS="LITERAL"
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>cdl_interface</TT
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> and <TT
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CLASS="LITERAL"
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>cdl_option</TT
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> commands in the body of a package.
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However all configuration entities that occur at the top level of the
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script containing the <TT
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CLASS="LITERAL"
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>cdl_package</TT
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> command are automatically placed
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below that package in the configuration hierarchy, so putting them
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inside the body has no effect.</P
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><P
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>The following properties cannot be used in the body of a <TT
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CLASS="LITERAL"
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>cdl_package</TT
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>
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command:</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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><SPAN
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CLASS="PROPERTY"
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>flavor</SPAN
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></DT
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><DD
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><P
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>Packages always have the flavor <TT
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CLASS="LITERAL"
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>booldata</TT
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>.</P
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></DD
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><DT
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><SPAN
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CLASS="PROPERTY"
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>default_value</SPAN
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></DT
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><DD
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><P
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>The value of a package is its version number. This is specified at the
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time the package is loaded into the configuration, and cannot be
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calculated afterwards. Typically the most recent version of the
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package will be loaded.</P
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></DD
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><DT
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><SPAN
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CLASS="PROPERTY"
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>legal_values</SPAN
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></DT
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><DD
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><P
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>The legal values list for a given package is determined by which
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versions of that package are installed in the component repository,
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and cannot be further constrained in the CDL scripts.</P
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></DD
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><DT
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><SPAN
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CLASS="PROPERTY"
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>calculated</SPAN
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></DT
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><DD
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><P
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>The value of a package is always selected at the time that it is
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loaded into the configuration, and cannot be re-calculated afterwards.</P
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></DD
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><DT
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><SPAN
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CLASS="PROPERTY"
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>script</SPAN
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></DT
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><DD
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><P
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>This would be redundant since the CDL script containing the
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<TT
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CLASS="LITERAL"
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>cdl_package</TT
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> command acts as that package's script.</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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><TT
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CLASS="LITERAL"
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>cdl_package</TT
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> is implemented as a Tcl command that takes two
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arguments, a name and a body. The name must be a valid C preprocessor
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identifier: a sequence of upper or lower case letters, digits or
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underscores, starting with a non-digit character; identifiers
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beginning with an underscore should normally be avoided because they
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may clash with system packages or with identifiers reserved for use by
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the compiler. Packages should always have unique names within a given
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component repository. For a recommended naming convention see <A
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HREF="package.contents.html"
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>the Section called <I
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>Package Contents and Layout</I
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> in Chapter 2</A
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>.</P
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><P
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>The second argument to <TT
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CLASS="LITERAL"
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>cdl_package</TT
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> is a body of properties and other
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commands, typically surrounded by braces so that the Tcl interpreter
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treats it as a single argument. This body will be processed by a
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recursive invocation of the Tcl interpreter, extended with additional
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commands for the various properties that are allowed inside a
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<TT
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CLASS="LITERAL"
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>cdl_package</TT
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>. The valid commands are:</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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><A
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HREF="ref.active-if.html"
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><SPAN
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CLASS="PROPERTY"
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>active_if</SPAN
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></A
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></DT
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><DD
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><P
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>Allow additional control over the active state of this package.</P
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></DD
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><DT
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><A
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HREF="ref.cdl-component.html"
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><TT
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CLASS="LITERAL"
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>cdl_component</TT
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></A
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></DT
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><DD
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><P
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>Define a component which should appear immediately below this package
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in the configuration hierarchy.</P
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></DD
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><DT
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><A
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HREF="ref.cdl-interface.html"
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><TT
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CLASS="LITERAL"
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>cdl_interface</TT
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></A
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></DT
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><DD
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><P
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>Define an interface which should appear immediately below this
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package in the configuration hierarchy.</P
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></DD
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><DT
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><A
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HREF="ref.cdl-option.html"
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><TT
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CLASS="LITERAL"
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>cdl_option</TT
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></A
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></DT
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><DD
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><P
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>Define an option which should appear immediately below
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this package in the configuration hierarchy.</P
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></DD
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><DT
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><A
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HREF="ref.compile.html"
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><SPAN
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CLASS="PROPERTY"
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>compile</SPAN
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></A
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></DT
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><DD
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><P
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>List the source files that should be built for this package.</P
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></DD
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><DT
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><A
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HREF="ref.define.html"
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><SPAN
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CLASS="PROPERTY"
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>define</SPAN
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></A
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></DT
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><DD
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><P
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>Specify additional <TT
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CLASS="LITERAL"
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>#define</TT
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> symbols that should go
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into the package's configuration header file.</P
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></DD
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><DT
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><A
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HREF="ref.define-format.html"
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><SPAN
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CLASS="PROPERTY"
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>define_format</SPAN
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></A
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></DT
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><DD
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><P
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>Control how the package's value will appear in the global
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configuration header file <TT
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CLASS="FILENAME"
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>pkgconf/system.h</TT
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></P
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></DD
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><DT
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><A
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HREF="ref.define-header.html"
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><SPAN
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CLASS="PROPERTY"
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>define_header</SPAN
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></A
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></DT
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><DD
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><P
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>Specify the configuration header file that will be generated for this package.</P
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></DD
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><DT
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><A
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HREF="ref.define-proc.html"
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><SPAN
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CLASS="PROPERTY"
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>define_proc</SPAN
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></A
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></DT
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><DD
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><P
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>Use a fragment of Tcl code to output additional data to
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configuration header files.</P
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></DD
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><DT
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><A
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HREF="ref.description.html"
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><SPAN
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CLASS="PROPERTY"
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>description</SPAN
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></A
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></DT
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><DD
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><P
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>Provide a textual description for this component.</P
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></DD
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><DT
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><A
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HREF="ref.display.html"
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><SPAN
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CLASS="PROPERTY"
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>display</SPAN
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></A
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></DT
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><DD
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><P
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>Provide a short string describing this component.</P
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></DD
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><DT
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><A
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HREF="ref.doc.html"
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><SPAN
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CLASS="PROPERTY"
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>doc</SPAN
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></A
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></DT
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><DD
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><P
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>The location of on-line documentation for this component.</P
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></DD
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><DT
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><A
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HREF="ref.hardware.html"
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><SPAN
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CLASS="PROPERTY"
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>hardware</SPAN
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></A
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></DT
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><DD
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><P
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>This package is tied to specific hardware.</P
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></DD
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><DT
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><A
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HREF="ref.if-define.html"
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><SPAN
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CLASS="PROPERTY"
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>if_define</SPAN
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></A
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></DT
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><DD
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><P
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>Output a common preprocessor construct to a configuration header file. </P
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></DD
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><DT
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><A
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HREF="ref.implements.html"
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><SPAN
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CLASS="PROPERTY"
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>implements</SPAN
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></A
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></DT
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><DD
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><P
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>Enabling this component provides one instance of a more general
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interface. </P
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></DD
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><DT
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><A
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HREF="ref.include-dir.html"
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><SPAN
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CLASS="PROPERTY"
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>include_dir</SPAN
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></A
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></DT
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><DD
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><P
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>Specify the desired location of this package's exported header files in
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the install tree.</P
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></DD
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><DT
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><A
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HREF="ref.include-files.html"
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><SPAN
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CLASS="PROPERTY"
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>include_files</SPAN
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></A
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></DT
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><DD
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><P
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>List the header files that are exported by this package.</P
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></DD
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><DT
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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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></DT
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><DD
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><P
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>Specify which library should contain the object files
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generated by building this package.</P
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></DD
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><DT
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><A
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HREF="ref.make.html"
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><SPAN
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CLASS="PROPERTY"
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>make</SPAN
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></A
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></DT
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><DD
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><P
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>An additional custom build step associated with this component, resulting
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in a target that should not go directly into a library.</P
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></DD
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><DT
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><A
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HREF="ref.make-object.html"
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><SPAN
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CLASS="PROPERTY"
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>make_object</SPAN
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></A
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></DT
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><DD
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><P
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>An additional custom build step associated with this component, resulting
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in an object file that should go into a library.</P
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></DD
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><DT
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><A
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HREF="ref.no-define.html"
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><SPAN
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CLASS="PROPERTY"
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>no_define</SPAN
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></A
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></DT
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><DD
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><P
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>Suppress the normal generation of the package's
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<TT
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CLASS="LITERAL"
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>#define</TT
541
> in the global configuration header file
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<TT
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CLASS="FILENAME"
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>pkgconf/system.h</TT
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>.</P
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></DD
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><DT
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><A
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HREF="ref.parent.html"
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><SPAN
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CLASS="PROPERTY"
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>parent</SPAN
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></A
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></DT
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><DD
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><P
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>Control the location of this package in the configuration hierarchy. </P
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></DD
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><DT
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><A
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HREF="ref.requires.html"
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><SPAN
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CLASS="PROPERTY"
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>requires</SPAN
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></A
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></DT
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><DD
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><P
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>List constraints that the configuration should satisfy if this package is
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active.</P
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></DD
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></DL
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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="AEN3468"
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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_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 null.cxx simple.cxx fancy.cxx buffer.cxx \
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            diag.cxx tcdiag.cxx memcpy.c memset.c delete.cxx
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}&#13;</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="AEN3471"
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></A
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><H2
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>See Also</H2
613
><P
614
>Command <A
615
HREF="ref.cdl-option.html"
616
><TT
617
CLASS="LITERAL"
618
>cdl_option</TT
619
></A
620
>,
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command <A
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HREF="ref.cdl-component.html"
623
><TT
624
CLASS="LITERAL"
625
>cdl_component</TT
626
></A
627
>,
628
command <A
629
HREF="ref.cdl-interface.html"
630
><TT
631
CLASS="LITERAL"
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>cdl_interface</TT
633
></A
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>.</P
635
></DIV
636
><DIV
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CLASS="NAVFOOTER"
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><HR
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WIDTH="100%"><TABLE
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SUMMARY="Footer navigation table"
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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><A
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HREF="ref.cdl-component.html"
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ACCESSKEY="P"
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>Prev</A
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ALIGN="center"
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HREF="cdl-guide.html"
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>Home</A
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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><TT
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CLASS="LITERAL"
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>cdl_component</TT
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></TD
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ALIGN="center"
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VALIGN="top"
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><A
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HREF="reference.html"
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>Up</A
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ALIGN="right"
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><TT
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