msbuild - How to clear (and possibly include other) items from an ItemGroup? -


in build process, i'm using pattern, whereby somes tasks designed compute list of items in item group, , other tasks create physical corresponding items.

this allows me minimize build times performing incremental build.

in 1 of our project, need manipulate items in itemgroup. first attempt, first, clear contents of itemgroup , then, include ones i'm interested itemgroup.

however, stumbled upon behavior of msbuild not make sense me. issue, trying clear items from itemgroup when particular target executes. is, if, after analysing inputs , outputs attributes, msbuild determines target must executed.

here minimal code snippet reproduce problem:

  <target name="computecustomitemgroup">     <createitem include="c:\temp\fichier1.ext;c:\temp\fichier2.ext;">       <output taskparameter="include" itemname="customitemgroup" />     </createitem>   </target>    <target name="createcustomitemgroup" dependsontargets="computecustomitemgroup"           inputs="c:\temp\input"           outputs="c:\temp\output">     <message text="creating custom item group..." />     <!-- ability clear item group *only* when target executed -->     <!-- clears item group every time appears in dependency chain of executing target ! -->     <itemgroup>       <customitemgroup remove="@(customitemgroup)" />     </itemgroup>   </target>    <target name="customtarget" dependsontargets="createcustomitemgroup">     <message text="executing custom target..." />     <!-- here, @(customitemgroup) empty... -->     <message text="customitemgroup: @(customitemgroup)" />   </target>    <target name="build" dependsontargets="customtarget" />  </project>

in code sample above, @(customitemgroup) set collection containing couple of file paths. that's fine.

now, if create 2 files, @ following locations c:\temp\input , c:\temp\output (one after other, obviously), result of sample code above @(customitemgroup) comes empty, though target name="createcustomitemgroup" not executed.

i've tried using legacy createitem way manipulate itemgroups not find safisfying answer.

can suggest workaround?

you facing "output inference" described here http://msdn.microsoft.com/en-us/library/vstudio/ee264087%28v=vs.100%29.aspx

the target has no out-of-date outputs , skipped. msbuild evaluates target , makes changes items , properties if target had been run.

consider re-designing logic use condition statements assignments.


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