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> Component Writer's Guide</TH
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><H1
><A
NAME="REF.INCLUDE-DIR"><SPAN
CLASS="PROPERTY"
>include_dir</SPAN
></H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN4534"
></A
><H2
>Name</H2
>Property <SPAN
CLASS="PROPERTY"
>include_dir</SPAN
> -- Specify the desired location of a package's exported
header files in the install tree.</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN4538"><H2
>Synopsis</H2
><TABLE
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><TR
><TD
><PRE
CLASS="SYNOPSIS"
>cdl_package <name> {
include_dir <sub-directory>
…
}</PRE
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN4540"
></A
><H2
>Description</H2
><P
>Most packages export one or more header files defining their public
interface. For example the C library exports header files such as
<TT
CLASS="FILENAME"
>stdio.h</TT
> and
<TT
CLASS="FILENAME"
>ctype.h</TT
>.
If the package follows the <A
HREF="package.html#PACKAGE.HIERARCHY"
>directory
layout conventions</A
> then the exported header files will normally
be found in the package's
<TT
CLASS="FILENAME"
>include</TT
> sub-directory.
Alternatively the <SPAN
CLASS="PROPERTY"
>include_files</SPAN
> property can be used to specify
which header files should be exported.</P
><P
>By default a package's exported header files will be copied to
the <TT
CLASS="FILENAME"
>include</TT
> sub-directory of
the install tree. This is correct for packages like the C library
because that is the correct location for files such as
<TT
CLASS="FILENAME"
>stdio.h</TT
>. However to reduce the
probability of name clashes it is desirable for packages to use
different sub-directories, for example infrastructure header files get
copied to <TT
CLASS="FILENAME"
>include/cyg/infra</TT
>
rather than to the top-level
<TT
CLASS="FILENAME"
>include</TT
> directory itself.</P
><P
>It would be possible to replicate these sub-directories in each
package's source tree, such that the infrastructure header file
sources lived in
<TT
CLASS="FILENAME"
>include/cyg/infra</TT
> in the source
tree as well as in the install tree. This would make things more
difficult for the package developers. Instead it is possible to
specify the desired install tree sub-directory using an <SPAN
CLASS="PROPERTY"
>include_dir</SPAN
>
property, for example <TT
CLASS="LITERAL"
>include_dir cyg/infra</TT
>.</P
><P
>The <SPAN
CLASS="PROPERTY"
>include_dir</SPAN
> property can only be used in the body of a
<TT
CLASS="LITERAL"
>cdl_package</TT
> command, since it applies to all of the header files
exported by a package, and only one <SPAN
CLASS="PROPERTY"
>include_dir</SPAN
> property can be
used. If there is no <SPAN
CLASS="PROPERTY"
>include_dir</SPAN
> property then exported header files
will end up in the top-level <TT
CLASS="FILENAME"
>include</TT
>
directory of the install tree.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN4563"
></A
><H2
>Example</H2
><TABLE
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><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>cdl_package CYGPKG_INFRA {
display "Infrastructure"
include_dir cyg/infra
description "
Common types and useful macros.
Tracing and assertion facilities.
Package startup options."
…
}</PRE
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN4566"
></A
><H2
>See Also</H2
><P
>Property <A
HREF="ref.include-files.html"
><SPAN
CLASS="PROPERTY"
>include_files</SPAN
></A
>, and
command <A
HREF="ref.cdl-package.html"
><TT
CLASS="LITERAL"
>cdl_package</TT
></A
>.</P
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