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><H1
><A
NAME="REF.COMPILE"><SPAN
CLASS="PROPERTY"
>compile</SPAN
></H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN3821"
></A
><H2
>Name</H2
>Property <SPAN
CLASS="PROPERTY"
>compile</SPAN
> -- List the source files that should be built if this option
is active and enabled.</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN3825"><H2
>Synopsis</H2
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="SYNOPSIS"
>cdl_option <name> {
compile [-library=libxxx.a] <list of files>
…
}</PRE
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN3827"
></A
><H2
>Description</H2
><P
>The <SPAN
CLASS="PROPERTY"
>compile</SPAN
> property allows component developers to specify source
files which should be compiled and added to one of the target
libraries. Usually each source file will end up the library
<TT
CLASS="FILENAME"
>libtarget.a</TT
>. It is possible for component writers
to specify an alternative library for an entire package using the
<A
HREF="ref.library.html"
><SPAN
CLASS="PROPERTY"
>library</SPAN
></A
> property. Alternatively
the desired library can be specified on the <SPAN
CLASS="PROPERTY"
>compile</SPAN
> line itself. For
example, to add a particular source file to the
<TT
CLASS="FILENAME"
>libextras.a</TT
> library the following could be used:</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>cdl_package CYGPKG_IO_SERIAL {
…
compile -library=libextras.a common/tty.c
}</PRE
></TD
></TR
></TABLE
><P
>Details of the build process including such issues as compiler flags
and the order in which things happen can be found in
<A
HREF="build.html"
>Chapter 4</A
>. </P
><P
><SPAN
CLASS="PROPERTY"
>compile</SPAN
> properties can occur in any of <TT
CLASS="LITERAL"
>cdl_option</TT
>,
<TT
CLASS="LITERAL"
>cdl_component</TT
>, <TT
CLASS="LITERAL"
>cdl_package</TT
> or <TT
CLASS="LITERAL"
>cdl_interface</TT
>. A <SPAN
CLASS="PROPERTY"
>compile</SPAN
>
property has effect if and only if the entity that contains it is
active and enabled. Typically the body of a <TT
CLASS="LITERAL"
>cdl_package</TT
> will define
any source files that need to be built irrespective of individual
options, and each <TT
CLASS="LITERAL"
>cdl_component</TT
>, <TT
CLASS="LITERAL"
>cdl_option</TT
>, and <TT
CLASS="LITERAL"
>cdl_interface</TT
>
will define source files that are more specific. A single <SPAN
CLASS="PROPERTY"
>compile</SPAN
>
property can list any number of source files, all destined for the
same library. A <TT
CLASS="LITERAL"
>cdl_option</TT
> or other entity can contain multiple
<SPAN
CLASS="PROPERTY"
>compile</SPAN
> properties, each of which can specify a different library.
It is possible for a given source file to be specified in <SPAN
CLASS="PROPERTY"
>compile</SPAN
>
properties for several different options, in which case the source
file will get built if any of these options are active and enabled.</P
><P
>If the package follows the <A
HREF="package.html#PACKAGE.HIERARCHY"
>directory
layout conventions</A
> then the configuration tools will search for
the specified source files first in the
<TT
CLASS="FILENAME"
>src</TT
> subdirectory of the
package, then relative to the package directory itself. </P
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Note: </B
>A shortcoming of the current specification of <SPAN
CLASS="PROPERTY"
>compile</SPAN
> properties is
that there is no easy way to specify source files that should be built
unless an option is enabled. It would sometimes be useful to be able
to say: “if option <TT
CLASS="LITERAL"
>A</TT
> is enabled then compile
file <TT
CLASS="FILENAME"
>x.c</TT
>, otherwise compile file
<TT
CLASS="FILENAME"
>y.c</TT
>. There are two simple ways of achieving this: </P
><P
></P
><UL
><LI
><P
>Always compile <TT
CLASS="FILENAME"
>y.c</TT
>, typically by listing it in
the body of the <TT
CLASS="LITERAL"
>cdl_package</TT
>, but use
<TT
CLASS="LITERAL"
>#ifndef A</TT
> to produce an empty object file if
option <TT
CLASS="LITERAL"
>A</TT
> is not enabled. This has the big
disadvantage that the file always gets compiled and hence for some
configurations builds will take longer than necessary.</P
></LI
><LI
><P
>Use a <SPAN
CLASS="PROPERTY"
>calculated</SPAN
> option whose value is <TT
CLASS="LITERAL"
>!A</TT
>, and
have a <TT
CLASS="LITERAL"
>compile y.c</TT
> property in its body. This
has the big disadvantage of adding another calculated option to the
configuration.</P
></LI
></UL
><P
>It is likely that this will be resolved in the future, possibly by
using some sort of expression as the argument to a <SPAN
CLASS="PROPERTY"
>compile</SPAN
> property.</P
></BLOCKQUOTE
></DIV
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Note: </B
>Currently it is not possible to control the priority of a <SPAN
CLASS="PROPERTY"
>compile</SPAN
>
property, in other words the order in which a file gets compiled
relative to other build steps. This functionality might prove useful
for complicated packages and should be added.</P
></BLOCKQUOTE
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN3880"
></A
><H2
>Example</H2
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><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."
compile startup.cxx prestart.cxx pkgstart.cxx userstart.cxx \
dummyxxmain.cxx memcpy.c memset.c delete.cxx \
diag.cxx tcdiag.cxx
}</PRE
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN3883"
></A
><H2
>See Also</H2
><P
>Properties <A
HREF="ref.make.html"
>make</A
>,
<A
HREF="ref.make-object.html"
>make_object</A
> and
<A
HREF="ref.library.html"
>library</A
>.</P
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