From 48f9cf3be60190c07d5c8be1ac3a7aa7c259715b Mon Sep 17 00:00:00 2001
From: Leonard Ehrenfried <leonard.ehrenfried@gmail.com>
Date: Wed, 8 Nov 2017 12:30:51 +0100
Subject: [PATCH] Disable calculation of log4j caller location information

---
 .../util-logging/src/main/scala/sbt/util/LogExchange.scala    | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/internal/util-logging/src/main/scala/sbt/util/LogExchange.scala b/internal/util-logging/src/main/scala/sbt/util/LogExchange.scala
index 0c35c98ee..b5bb1cb56 100644
--- a/internal/util-logging/src/main/scala/sbt/util/LogExchange.scala
+++ b/internal/util-logging/src/main/scala/sbt/util/LogExchange.scala
@@ -31,7 +31,9 @@ sealed abstract class LogExchange {
       false,
       XLevel.DEBUG,
       name,
-      "true",
+      // disable the calculation of caller location as it is very expensive
+      // https://issues.apache.org/jira/browse/LOG4J2-153
+      "false",
       Array[AppenderRef](),
       null,
       config,