--- a/mxtool/mx.py	Fri Jun 06 16:01:54 2014 +0200
+++ b/mxtool/mx.py	Fri Jun 06 16:03:56 2014 +0200
@@ -1978,8 +1978,9 @@
             if not self.jdtJar:
                 mainJava = java()
                 if not args.error_prone:
-                    self.logCompilation('javac')
-                    javacCmd = [mainJava.javac, '-g', '-J-Xmx1g', '-source', compliance, '-target', compliance, '-classpath', cp, '-d', outputDir, '-bootclasspath', jdk.bootclasspath(), '-endorseddirs', jdk.endorseddirs(), '-extdirs', jdk.extdirs()]
+                    javac = args.alt_javac if args.alt_javac else mainJava.javac
+                    self.logCompilation('javac' if not args.alt_javac else args.alt_javac)
+                    javacCmd = [javac, '-g', '-J-Xmx1g', '-source', compliance, '-target', compliance, '-classpath', cp, '-d', outputDir, '-bootclasspath', jdk.bootclasspath(), '-endorseddirs', jdk.endorseddirs(), '-extdirs', jdk.extdirs()]
                     if jdk.debug_port is not None:
                         javacCmd += ['-J-Xdebug', '-J-Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=' + str(jdk.debug_port)]
                     javacCmd += processorArgs
@@ -2063,10 +2064,11 @@
     parser.add_argument('--no-native', action='store_false', dest='native', help='do not build native projects')
     parser.add_argument('--jdt-warning-as-error', action='store_true', help='convert all Eclipse batch compiler warnings to errors')
     parser.add_argument('--jdt-show-task-tags', action='store_true', help='show task tags as Eclipse batch compiler warnings')
+    parser.add_argument('--alt-javac', dest='alt_javac', help='path to alternative javac executable', metavar='<path>')
     compilerSelect = parser.add_mutually_exclusive_group()
     compilerSelect.add_argument('--error-prone', dest='error_prone', help='path to error-prone.jar', metavar='<path>')
     compilerSelect.add_argument('--jdt', help='path to ecj.jar, the Eclipse batch compiler', default=_defaultEcjPath(), metavar='<path>')
-    compilerSelect.add_argument('--force-javac', action='store_true', dest='javac', help='use javac despite ecj.jar is found or not')
+    compilerSelect.add_argument('--force-javac', action='store_true', dest='javac', help='use javac whether ecj.jar is found or not')
 
     if suppliedParser:
         parser.add_argument('remainder', nargs=REMAINDER, metavar='...')