From dd72b19f861d6c39796fdf9950f585f0368348a9 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Wed, 29 Jan 2014 13:51:32 -0500
Subject: [PATCH] Find{Java,JNI}: Use /usr/libexec/java_home on OS X

If no JAVA_HOME or ENV{JAVA_HOME} is set then try running this
tool to get the system default Java home.

Suggested-by: Larry Shaffer <larrys@dakotacarto.com>
---
 Modules/CMakeFindJavaCommon.cmake | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Modules/CMakeFindJavaCommon.cmake b/Modules/CMakeFindJavaCommon.cmake
index fd5268905..fcf038970 100644
--- a/Modules/CMakeFindJavaCommon.cmake
+++ b/Modules/CMakeFindJavaCommon.cmake
@@ -25,6 +25,17 @@ else()
   if(_ENV_JAVA_HOME AND IS_DIRECTORY "${_ENV_JAVA_HOME}")
     set(_JAVA_HOME "${_ENV_JAVA_HOME}")
     set(_JAVA_HOME_EXPLICIT 1)
+  else()
+    set(_CMD_JAVA_HOME "")
+    if(APPLE AND EXISTS /usr/libexec/java_home)
+      execute_process(COMMAND /usr/libexec/java_home
+        OUTPUT_VARIABLE _CMD_JAVA_HOME OUTPUT_STRIP_TRAILING_WHITESPACE)
+    endif()
+    if(_CMD_JAVA_HOME AND IS_DIRECTORY "${_CMD_JAVA_HOME}")
+      set(_JAVA_HOME "${_CMD_JAVA_HOME}")
+      set(_JAVA_HOME_EXPLICIT 0)
+    endif()
+    unset(_CMD_JAVA_HOME)
   endif()
   unset(_ENV_JAVA_HOME)
 endif()