dchenbecker commented on code in PR #2593:
URL: https://github.com/apache/cassandra/pull/2593#discussion_r1300196069


##########
build.xml:
##########
@@ -90,7 +90,10 @@
     <property name="test.jvm.args" value="" />
     <property name="testtag.extra" value="" />
     <property name="dist.dir" value="${build.dir}/dist"/>
-    <property name="tmp.dir" value="${java.io.tmpdir}"/>
+
+    <!-- Use build/tmp for temp files if not otherwise specified. Because Ant 
properties are immutable, this has no effect if
+         the user specifies the tmp.dir property -->
+    <property name="tmp.dir" value="${build.dir}/tmp"/>

Review Comment:
   Actually, that won't work since we're running inside `ant` and the property 
will always be set since it's the JVM. I can't think of a way to differentiate 
between a JVM default `java.io.tmpdir` and one that was passed on the ant 
command line...



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