<subant genericbuildfile> ?

Or a combination of <subant> and <import> as described in the <subant> examples (I think, the last one).


Jan

> -----Ursprüngliche Nachricht-----
> Von: Cyril Sagan [mailto:Cyril.Sagan@(protected)]
> Gesendet: Donnerstag, 29. Mai 2008 00:27
> An: Ant Users List
> Betreff: How can I "conditionall chooise" a target implementation?
>
> PROBLEM: I'm trying to develop a general build framework.  
> In so doing,
>       I need some mechanism for to provide a "conditional
> implementation"
>       for a target. We cannot solve this problem using
> <antcall/>.
>       Can anyone suggest an implementation?
>
>
> Here's a couple ways that I tried, that almost work,... but do not.
>
> All use this simple build.xml:
>  <?xml version="1.0"?>
>  <project name="generic_build" default="all">
>     <property file="config.properties" />
>     <import file="common.xml"/>
>  </project>
>
>
> Failing attempt #1: This almost works, but doesn't because <import/>
> cannot be embedded inside a target!! arg!
>
> common.xml:
>  <?xml version="1.0"?>
>  <project name="generic_build" default="all">
>     <target name="use_lib_A" if="use.A">
>       <!-- sorry, cannot <import/> in a target! -->
>       <import file="lib_A.xml" /> <!-- target "all_impl"
> defined inside -->
>     </target>
>
>     <target name="use_lib_B" if="use.B">
>       <!-- sorry, cannot <import/> in a target! -->
>       <import file="lib_B.xml" /> <!-- target "all_impl"
> defined inside -->
>     </target>
>
>     <target name="all"
>          depends="init, use_lib_A, use_lib_B, all_impl" />
>  </project>
>
>
>
> Failing attempt #2: This would work, if Ant supported
> property expansion
> in the targets's depends attribute.
>
> common.xml:
>  <?xml version="1.0"?>
>  <project name="generic_build" default="all">
>     <import file="lib_A.xml" />
>     <import file="lib_B.xml" />
>
>     <target name="use_lib_A" if="use.A">
>       <property name="use.library" value="lib_A" />
>     </target>
>
>     <target name="use_lib_B" if="use.B">
>       <property name="use.library" value="lib_B" />
>     </target>
>
>     <target name="use_lib_B" if="use.B">
>       <import file="lib_B.xml" /> <!-- target "all_impl"
> defined inside -->
>     </target>
>
>     <!-- sorry, no property expansion inside attributes! -->
>     <target name="all"
>          depends="init, use_lib_A, use_lib_B,
> ${use.library}.all_impl" />
>  </project>
>
>
>
> Failing attempt #3: Almost works, except the depends targets
> always excute...
>
> common.xml:
>  <?xml version="1.0"?>
>  <project name="generic_build" default="all">
>     <import file="lib_A.xml" />
>     <import file="lib_B.xml" />
>
>     <!-- sorry, depends called regardless of if/unless -->
>     <target name="use_lib_A" if="use.A"
> depends="implementation_A" />
>     <target name="use_lib_A" if="use.B"
> depends="implementation_B" />
>
>     <target name="all" depends="init, use_lib_A, use_lib_B"
>  </project>
>
> This gets us closest to what we want, and would suffice if we could
> tolerate the <antcall/>:
>     <target name="use_lib_A" if="use.A">
>       <antcall target="implementation_A" />
>     </target>
>
> ...but we can't use antcall because it re-reads the *entire* build
> file. There's some fairly complicated init (that we don't have
> control of) that doesn't tolerate being called multiple times.
>
> I'd appreciate any suggestions from the experts!
>
> Thanks.
>
> --Cyril
>
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