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<!-- Copyright (C) 2003 Red Hat, Inc. --> <!-- This material may be distributed only subject to the terms --> <!-- and conditions set forth in the Open Publication License, v1.0 --> <!-- or later (the latest version is presently available at --> <!-- http://www.opencontent.org/openpub/). --> <!-- Distribution of the work or derivative of the work in any --> <!-- standard (paper) book form is prohibited unless prior --> <!-- permission is obtained from the copyright holder. --> <HTML ><HEAD ><TITLE >library</TITLE ><meta name="MSSmartTagsPreventParsing" content="TRUE"> <META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+ "><LINK REL="HOME" TITLE="The eCos Component Writer's Guide" HREF="cdl-guide.html"><LINK REL="UP" TITLE="CDL Language Specification" HREF="reference.html"><LINK REL="PREVIOUS" TITLE="legal_values" HREF="ref.legal-values.html"><LINK REL="NEXT" TITLE="make" HREF="ref.make.html"></HEAD ><BODY CLASS="REFENTRY" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >The <SPAN CLASS="APPLICATION" >eCos</SPAN > Component Writer's Guide</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="ref.legal-values.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="ref.make.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="REF.LIBRARY"><SPAN CLASS="PROPERTY" >library</SPAN ></H1 ><DIV CLASS="REFNAMEDIV" ><A NAME="AEN4667" ></A ><H2 >Name</H2 >Property <SPAN CLASS="PROPERTY" >library</SPAN > -- Specify which library should contain the object files generated by building this package.</DIV ><DIV CLASS="REFSYNOPSISDIV" ><A NAME="AEN4671"><H2 >Synopsis</H2 ><TABLE BORDER="5" BGCOLOR="#E0E0F0" WIDTH="70%" ><TR ><TD ><PRE CLASS="SYNOPSIS" >cdl_package <name> { library <library name> … }</PRE ></TD ></TR ></TABLE ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN4673" ></A ><H2 >Description</H2 ><P >By default all object files that get built for all packages end up in a single library, <TT CLASS="FILENAME" >libtarget.a</TT >. This makes things easier for the typical application developer because it is only necessary to link with a single library, rather than with separate libraries for each package. It is possible to specify an alternative library for specific files as an option to the <SPAN CLASS="PROPERTY" >compile</SPAN > and <SPAN CLASS="PROPERTY" >make_object</SPAN > properties, and there is one library <A HREF="build.html" ><TT CLASS="FILENAME" >libextras.a</TT ></A > which serves a specific purpose in the build system. The <SPAN CLASS="PROPERTY" >library</SPAN > property allows an alternative library to be specified for all the object files that will be generated for a given package.</P ><P >The use of the <SPAN CLASS="PROPERTY" >library</SPAN > property should be avoided, since it makes things more difficult for application developers. The property is intended only for special cases, for example if there are legal objections to mingling object files from different packages in a single library. It could also be used to work around name clash problems if two packages happen to define an exported symbol with the same name, but any attempt to use multiple libraries in this way is error-prone and should be avoided.</P ><P >The <SPAN CLASS="PROPERTY" >library</SPAN > property takes a single argument, the name of a library, which should follow the standard naming convention of <TT CLASS="LITERAL" >lib<something>.a</TT >. A <SPAN CLASS="PROPERTY" >library</SPAN > property can only occur in the body of a <TT CLASS="LITERAL" >cdl_package</TT > command and applies to all object files generated for that package (except where explicitly overwritten with a <TT CLASS="LITERAL" >-library=</TT > option to one of the build-related properties). A <TT CLASS="LITERAL" >cdl_package</TT > body can contain at most one <SPAN CLASS="PROPERTY" >library</SPAN > property.</P ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN4692" ></A ><H2 >Example</H2 ><TABLE BORDER="5" BGCOLOR="#E0E0F0" WIDTH="70%" ><TR ><TD ><PRE CLASS="PROGRAMLISTING" >cdl_package <SOME_PACKAGE> { … library libSomePackage.a }</PRE ></TD ></TR ></TABLE ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN4695" ></A ><H2 >See Also</H2 ><P >Properties <A HREF="ref.compile.html" ><SPAN CLASS="PROPERTY" >compile</SPAN ></A >, <A HREF="ref.make.html" ><SPAN CLASS="PROPERTY" >make</SPAN ></A >, and <A HREF="ref.make-object.html" ><SPAN CLASS="PROPERTY" >make_object</SPAN ></A >, command <A HREF="ref.cdl-package.html" ><TT CLASS="LITERAL" >cdl_package</TT ></A >.</P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="ref.legal-values.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="cdl-guide.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="ref.make.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><SPAN CLASS="PROPERTY" >legal_values</SPAN ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="reference.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><SPAN CLASS="PROPERTY" >make</SPAN ></TD ></TR ></TABLE ></DIV ></BODY ></HTML >
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