[PATCH 1/2] BaseTools: Enable MAX_CONCURRENT_THREAD_NUMBER = 0 feature

["Feng, YunhuaX" <yunhuax.feng@intel.com>]

when set 'MAX_CONCURRENT_THREAD_NUMBER=0',  will auto-detect number of processor threads for MAX_CONCURRENT_THREAD_NUMBER

Fixes: https://bugzilla.tianocore.org/show_bug.cgi?id=775
Cc: Liming Gao <liming.gao@intel.com>
Cc: Yonghong Zhu <yonghong.zhu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1

Signed-off-by: Yunhua Feng <yunhuax.feng@intel.com>
---
 BaseTools/Source/Python/build/build.py | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git BaseTools/Source/Python/build/build.py BaseTools/Source/Python/build/build.py
index 38498046d7..de19756d99 100644
--- BaseTools/Source/Python/build/build.py
+++ BaseTools/Source/Python/build/build.py
@@ -2,7 +2,7 @@
 # build a platform or a module
 #
 #  Copyright (c) 2014, Hewlett-Packard Development Company, L.P.<BR>
-#  Copyright (c) 2007 - 2017, Intel Corporation. All rights reserved.<BR>
+#  Copyright (c) 2007 - 2018, Intel Corporation. All rights reserved.<BR>
 #
 #  This program and the accompanying materials
 #  are licensed and made available under the terms and conditions of the BSD License
@@ -26,6 +26,7 @@ import platform
 import traceback
 import encodings.ascii
 import itertools
+import multiprocessing

 from struct import *
 from threading import *
@@ -936,7 +937,10 @@ class Build():
                 self.ThreadNumber = int(self.ThreadNumber, 0)

         if self.ThreadNumber == 0:
-            self.ThreadNumber = 1
+            try:
+                self.ThreadNumber = multiprocessing.cpu_count()
+            except (ImportError, NotImplementedError):
+                self.ThreadNumber = 1

         if not self.PlatformFile:
             PlatformFile = self.TargetTxt.TargetTxtDictionary[DataType.TAB_TAT_DEFINES_ACTIVE_PLATFORM]
--
2.12.2.windows.2