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<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
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<HTML
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><HEAD
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><TITLE
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>define_header</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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><H1
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><A
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NAME="REF.DEFINE-HEADER"><SPAN
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CLASS="PROPERTY"
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>define_header</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="AEN4123"
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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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>define_header</SPAN
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>&nbsp;--&nbsp;Specify the  configuration header file that
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will be generated for a given package.</DIV
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><DIV
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CLASS="REFSYNOPSISDIV"
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><A
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NAME="AEN4127"><H2
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>Synopsis</H2
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><TABLE
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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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    define_header &lt;file 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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></DIV
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><DIV
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CLASS="REFSECT1"
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><A
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NAME="AEN4129"
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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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>When the configuration tools generate a build tree, one of the steps
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is to output each package's configuration data to a header file. For
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example the kernel's configuration data gets output to
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<TT
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CLASS="FILENAME"
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>pkgconf/kernel.h</TT
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>. This allows
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each package's source code to <TT
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CLASS="LITERAL"
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>#include</TT
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> the
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appropriate header file and adapt to the choices made by the user.</P
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><P
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>By default the configuration tools will synthesize a file name from
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the package name. This involves removing any prefix such as
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<TT
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CLASS="LITERAL"
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>CYGPKG_</TT
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>, up to and including the first underscore,
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and then converting the remainder of the name to lower case. In some
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cases it may be desirable to use a different header file, for example
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an existing package may have been ported to <SPAN
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CLASS="APPLICATION"
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>eCos</SPAN
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> and the source code
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may already <TT
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CLASS="LITERAL"
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>#include</TT
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> a particular file for
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configuration data. In such cases a <SPAN
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CLASS="PROPERTY"
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>define_header</SPAN
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> property can be
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used to specify an alternative filename.</P
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><P
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>The <SPAN
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CLASS="PROPERTY"
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>define_header</SPAN
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> property can only be used in the body of a
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<TT
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CLASS="LITERAL"
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>cdl_package</TT
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> command. It applies to a package as a whole and cannot
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be used at a finer grain. The name specified in a <SPAN
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CLASS="PROPERTY"
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>define_header</SPAN
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>
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property will always be interpreted as relative to the
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<TT
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CLASS="FILENAME"
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>include/pkgconf</TT
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> sub-directory
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of the install tree.</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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>For hardware-specific packages such as device drivers and HAL
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packages, the current scheme of generating a configuration header file
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name based on the package name may be abandoned. Instead all hardware
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packages would send their configuration data to a single header file,
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<TT
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CLASS="FILENAME"
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>pkgconf/hardware.h</TT
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>. This would
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make it easier for code to obtain details of the current hardware, but
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obviously there are compatibility issues. For now it is recommended
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that all hardware packages specify their configuration header file
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explicitly. </P
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></BLOCKQUOTE
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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="AEN4147"
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></A
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><H2
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>Example</H2
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><TD
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><PRE
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CLASS="PROGRAMLISTING"
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>cdl_package CYGPKG_HAL_ARM {
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    display       "ARM architecture"
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    parent        CYGPKG_HAL
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    hardware
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    include_dir   cyg/hal
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    define_header hal_arm.h
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    &#8230;
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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="AEN4150"
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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.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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>,
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<A
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HREF="ref.define-format.html"
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>define_format</SPAN
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>,
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>if_define</SPAN
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> and
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