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>CDL Language Specification</TITLE
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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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><DIV
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CLASS="CHAPTER"
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><H1
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><A
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NAME="REFERENCE">Chapter 5. CDL Language Specification</H1
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><DIV
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CLASS="TOC"
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><DL
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><DT
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><B
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>Table of Contents</B
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></DT
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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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>&nbsp;--&nbsp;Define a single configuration option</DT
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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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>&nbsp;--&nbsp;Define a component, a collection of configuration options</DT
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><DT
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><A
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HREF="ref.cdl-package.html"
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><TT
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CLASS="LITERAL"
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>cdl_package</TT
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></A
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>&nbsp;--&nbsp;Define a package, a component that can be distributed</DT
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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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>&nbsp;--&nbsp;Define an interface, functionality that can be provided by
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a number of different implementations.</DT
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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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>&nbsp;--&nbsp;Allow additional control over the active state of an
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option or other CDL entity.</DT
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><DT
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><A
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HREF="ref.calculated.html"
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><SPAN
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CLASS="PROPERTY"
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>calculated</SPAN
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></A
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>&nbsp;--&nbsp;Used if the current option's value is not user-modifiable,
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but is calculated using a suitable CDL expression.</DT
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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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>&nbsp;--&nbsp;List the source files that should be built if this option
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is active and enabled.</DT
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><DT
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><A
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HREF="ref.default-value.html"
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><SPAN
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CLASS="PROPERTY"
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>default_value</SPAN
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></A
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>&nbsp;--&nbsp;Provide a default value for this option using a CDL expression.</DT
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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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>&nbsp;--&nbsp;Specify additional <TT
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CLASS="LITERAL"
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>#define</TT
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> symbols that
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should go into the owning package's configuration header file.</DT
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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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>&nbsp;--&nbsp;Control how an option's value will appear in the
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configuration header file.</DT
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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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>&nbsp;--&nbsp;Specify the  configuration header file that
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will be generated for a given package.</DT
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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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>&nbsp;--&nbsp;Use a fragment of Tcl code to output additional data to
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configuration header files.</DT
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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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>&nbsp;--&nbsp;Provide a textual description for an option.</DT
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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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>&nbsp;--&nbsp;Provide a short string describing this option.</DT
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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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>&nbsp;--&nbsp;The location of online-documentation for a configuration option.</DT
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><DT
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><A
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HREF="ref.flavor.html"
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><SPAN
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CLASS="PROPERTY"
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>flavor</SPAN
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></A
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>&nbsp;--&nbsp;Specify the nature of a configuration option.</DT
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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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>&nbsp;--&nbsp;Specify that a package is tied to specific hardware.</DT
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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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>&nbsp;--&nbsp;Output a common preprocessor construct to a configuration
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header file.</DT
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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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>&nbsp;--&nbsp;Enabling this option provides one instance of a more
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general interface.</DT
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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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>&nbsp;--&nbsp;Specify the desired location of a package's exported
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header files in the install tree.</DT
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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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>&nbsp;--&nbsp;List the header files that are exported by a package.</DT
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><DT
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><A
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HREF="ref.legal-values.html"
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><SPAN
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CLASS="PROPERTY"
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>legal_values</SPAN
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></A
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>&nbsp;--&nbsp;Impose constraints on the possible values for an option.</DT
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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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>&nbsp;--&nbsp;Specify which library should contain the object files
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generated by building this package.</DT
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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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>&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.</DT
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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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>&nbsp;--&nbsp;Define a custom build step, resulting in an object file
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that should go into a library.</DT
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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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>&nbsp;--&nbsp;Suppress the normal generation of a preprocessor
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<TT
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CLASS="LITERAL"
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>#define</TT
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> symbol in a configuration header file.</DT
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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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>&nbsp;--&nbsp;Control the location of an option in the configuration hierarchy.</DT
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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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>&nbsp;--&nbsp;List constraints that the configuration should satisfy if
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a given option is active and enabled..</DT
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><DT
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><A
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HREF="ref.script.html"
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><SPAN
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CLASS="PROPERTY"
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>script</SPAN
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></A
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>&nbsp;--&nbsp;Include additional configuration information from another
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CDL script.</DT
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></DL
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></DIV
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><P
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>This chapter contains reference information for the main <SPAN
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CLASS="APPLICATION"
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>CDL</SPAN
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>
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commands <TT
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CLASS="LITERAL"
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>cdl_option</TT
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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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> and
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<TT
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CLASS="LITERAL"
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>cdl_interface</TT
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>, followed by the various properties such as
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<SPAN
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CLASS="PROPERTY"
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>active_if</SPAN
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> and <SPAN
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>compile</SPAN
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> in alphabetical order.</P
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>&nbsp;</TD
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