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-><A
-NAME="AEN4877"
-></A
-><H2
->Name</H2
->Property <SPAN
-CLASS="PROPERTY"
->parent</SPAN
-> -- Control the location of an option in the configuration hierarchy.</DIV
-><DIV
-CLASS="REFSYNOPSISDIV"
-><A
-NAME="AEN4881"><H2
->Synopsis</H2
-><TABLE
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-><TR
-><TD
-><PRE
-CLASS="SYNOPSIS"
->cdl_option <name> {
- parent <component or package>
- …
-}</PRE
-></TD
-></TR
-></TABLE
-></DIV
-><DIV
-CLASS="REFSECT1"
-><A
-NAME="AEN4883"
-></A
-><H2
->Description</H2
-><P
->Configuration options live in a hierarchy of packages and components.
-By default a given option's position in the hierarchy is a simple
-consequence of its position within the CDL scripts. Packages are
-generally placed at the top-level of the configuration. Any components
-or options that are defined at the same level as the <TT
-CLASS="LITERAL"
->cdl_package</TT
->
-command in a package's top-level CDL script are placed immediately
-below that package in the hierarchy. Any options or components that
-are defined in the body of a <TT
-CLASS="LITERAL"
->cdl_package</TT
-> or <TT
-CLASS="LITERAL"
->cdl_component</TT
-> command,
-or that are read in as a result of processing a component's <SPAN
-CLASS="PROPERTY"
->script</SPAN
->
-property, will be placed immediately below that package or component
-in the hierarchy.</P
-><P
->In some circumstances it is useful to specify an alternative position
-in the hierarchy for a given option. For example it is often
-convenient to re-parent device driver packages below
-<TT
-CLASS="VARNAME"
->CYGPKG_IO</TT
-> in the configuration hierarchy, thus
-reducing the number of packages at the top level of the hierarchy and
-making navigation easier. The <SPAN
-CLASS="PROPERTY"
->parent</SPAN
-> property can be used to achieve
-this. </P
-><P
->The <SPAN
-CLASS="PROPERTY"
->parent</SPAN
-> property takes a single argument, which should be the
-name of a package or component. The body of a <TT
-CLASS="LITERAL"
->cdl_option</TT
-> or other
-CDL entity can contain at most one <SPAN
-CLASS="PROPERTY"
->parent</SPAN
-> property.</P
-><P
->Although the <SPAN
-CLASS="PROPERTY"
->parent</SPAN
-> property affects an option's position in the
-overall hierarchy and hence whether or not that option is active, a
-re-parented option still belongs to the package that defines it. By
-default any <TT
-CLASS="LITERAL"
->#define's</TT
-> will be exported to that
-package's configuration header file. Any <SPAN
-CLASS="PROPERTY"
->compile</SPAN
-> properties can only
-reference source files present in that package, and it is not directly
-possible to cause some file in another package to be built by
-re-parenting. </P
-><P
->As a special case, if an empty string is specified for the parent then
-the option is placed at the top of the hierarchy, ahead of any
-packages which are not explicitly re-parented in this way. This
-facility is useful for configuration options such as global
-preferences and default compiler flags.</P
-><DIV
-CLASS="TIP"
-><BLOCKQUOTE
-CLASS="TIP"
-><P
-><B
->Tip: </B
->If an option is re-parented somewhere below another package and that
-other package is not actually loaded, the option is an orphan and its
-active/inactive state is undefined. In such cases it is a good idea
-for the owning package to require the presence of the other one.
-Unfortunately this technique does not work if a package as a whole is
-reparented below another one that has not been loaded: the package is
-orphaned so it may be automatically inactive, and hence any <SPAN
-CLASS="PROPERTY"
->requires</SPAN
->
-properties would have no effect.</P
-></BLOCKQUOTE
-></DIV
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-><DIV
-CLASS="REFSECT1"
-><A
-NAME="AEN4905"
-></A
-><H2
->Example</H2
-><TABLE
-BORDER="5"
-BGCOLOR="#E0E0F0"
-WIDTH="70%"
-><TR
-><TD
-><PRE
-CLASS="PROGRAMLISTING"
->cdl_package CYGPKG_HAL_I386 {
- display "i386 architecture"
- parent CYGPKG_HAL
- hardware
- include_dir cyg/hal
- define_header hal_i386.h
- …
-}
-
-cdl_component CYGBLD_GLOBAL_OPTIONS {
- display "Global build options"
- parent ""
- …
-}</PRE
-></TD
-></TR
-></TABLE
-></DIV
-><DIV
-CLASS="REFSECT1"
-><A
-NAME="AEN4908"
-></A
-><H2
->See Also</H2
-><P
->Property <A
-HREF="ref.script.html"
-><SPAN
-CLASS="PROPERTY"
->script</SPAN
-></A
->,
-commands <A
-HREF="ref.cdl-component.html"
-><TT
-CLASS="LITERAL"
->cdl_component</TT
-></A
-> and
-<A
-HREF="ref.cdl-package.html"
-><TT
-CLASS="LITERAL"
->cdl_package</TT
-></A
->.</P
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