False warning is fixed with Ant 1.7.1.
diff --git a/org.jacoco.agent/buildhook.xml b/org.jacoco.agent/buildhook.xml
index 465c219..3ec8319 100644
--- a/org.jacoco.agent/buildhook.xml
+++ b/org.jacoco.agent/buildhook.xml
@@ -22,7 +22,6 @@
<!-- The random identifier will be used to create a unique package names -->
<randomid name="randomid"/>
- <echo>The following warning is false (Ant 1.7.0 Bug #47470), the archive is created anyway.</echo>
<jar destfile="${result.dist.lib.dir}/jacocoagent.jar">
<manifest>
<attribute name="Premain-Class" value="org.jacoco.${randomid}.agent.JacocoAgent"/>