On Sat, Oct 28, 2017 at 5:17 PM, R0b0t1 wrote:
> Is it possible to cache compilation results? I would like to avoid
> lengthy compile times after changing one file.
What I do for these situations is have the task create an empty file
which can then be used on subsequent executions for a modtime check to
determine if the task should execute or not.
I use something like the following general pattern:
<target name="sometask"
unless="skip.sometask"
depends="sometask-check">
...
<!-- Create empty file for subsequent up-to-date checks -->
<touch file="sometask.time" verbose="false"/>
</target>
<target name="sometask-check">
<uptodate property="skip.sometask"
targetfile="sometask.time">
<!-- Pattern/file set(s) here -->
</uptodate>
</target>
The dependent "sometask-check" will set the "skip.sometask" property if
any files specified in the pattern/file set are newer than the file
"sometask.time".
I normally put such modtime-check files in a specific directory that
gets removed when doing a "clean".
Unlike `make', Ant does not have implicit modtime dependency checks, so
you have to roll your own utilizing the <uptodate> task to set a
property that can be used to conditionalize the execution of a task.
--ewh
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