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<html>
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<head>
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<title>SCRAM - Exporting Software Units</title>
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<body bgcolor=beige>
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<center>
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<h1>Exporting Software Units</h1>
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<font color=red>S</font>oftware <font color=red>C</font>onfiguration,
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<font color=red>R</font>elease <font color=red>A</font>nd
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<font color=red>M</font>anagement
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</center>
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<hr>
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This section describes how to configure a software unit for use by other
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software units. This interface then provides functionality to the
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<Use name=unit_name> tag specified elsewhere in the project. They can
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also be accessed from other projects with the <em>use=</em> qualifier of
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the <a href=external.html><External> tag</a>
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<p>
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<h2>Defining the Interface</h2>
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The interface is defined in the BuildFile in the software unit. Anything
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between <b><export></b> and <b></export></b> tags will be
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taken as defining the interface.<p>
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<p>
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e.g A BuildFile in a SubSystem called CARF.
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<font color=green>
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<pre>
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<export>
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<lib name=G3Main>
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<lib name=G3Event>
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<lib name=Reco>
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<lib name=G3SimEvent>
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<lib name=G3Interface>
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<use name=SomeOtherSubsystem>
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</export>
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</pre>
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</font>
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<p>
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Any file that then wishes to use the subsytem CARF simply has to add the
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following line to their BuildFile.
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<font color=green>
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<pre>
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<Use name=CARF>
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</pre>
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</font>
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<p>
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to get all the apporpriate CARF libraries.<p>
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As can be seen in the above example, the use tag can be used
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within <export> tags to refer to other subsystems.
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<p>
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<h2>Package Application</h2>
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By default the specifications between the <export> tags do not propogate
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down into the package. Thus a package will have to use a <Use> tag to
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get its own libraries. <p>
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An alternative model (and the default before version 0_10_0) is to automatically
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propogate the appropriate interface to each of its corresponding packages.
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This can be done in the following ways
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<ol><li>Specify in the <export> tag. <p>
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e.g.
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<font color=green>
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<pre>
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<export autoexport=true>
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</pre>
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</font>
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<li>If this is to be the default behaviour then set
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<pre>
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scram_autoexport=true
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</pre>
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in the <a href=configBuildFile.html>project level BuildFile</a>.
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This default can be overridden
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with <font color=green>
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<pre>
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<export autoexport=false>
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</pre>
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</ol>
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<hr>
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<table border=1 width=100%>
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<td align=left>
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<a href=mailto:Christopher.Williams@cern.ch
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>Chris Williams</a>
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