[Patch 01/10 V3] BaseTools: Singleton the object to handle build conf file

["Bob Feng" <bob.c.feng@intel.com>]

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=1875

The build config files are target.txt, build rule, tooldef
During a build, the config is not changed, so the object to
handle them need to be singleton.

Cc: Liming Gao <liming.gao@intel.com>
Signed-off-by: Bob Feng <bob.c.feng@intel.com>
---
 BaseTools/Source/Python/AutoGen/AutoGen.py    | 33 ++----------
 .../Source/Python/AutoGen/BuildEngine.py      | 22 ++++++++
 .../Python/Common/TargetTxtClassObject.py     |  2 +
 .../Python/Common/ToolDefClassObject.py       |  6 ++-
 BaseTools/Source/Python/GenFds/GenFds.py      |  4 +-
 .../Python/GenFds/GenFdsGlobalVariable.py     | 54 ++++++++-----------
 .../Source/Python/Workspace/DscBuildData.py   |  8 +--
 BaseTools/Source/Python/build/build.py        | 29 +++-------
 8 files changed, 62 insertions(+), 96 deletions(-)

diff --git a/BaseTools/Source/Python/AutoGen/AutoGen.py b/BaseTools/Source/Python/AutoGen/AutoGen.py
index 2df055a109f7..c5b3fbb0a87f 100644
--- a/BaseTools/Source/Python/AutoGen/AutoGen.py
+++ b/BaseTools/Source/Python/AutoGen/AutoGen.py
@@ -22,11 +22,12 @@ from . import GenC
 from . import GenMake
 from . import GenDepex
 from io import BytesIO
 
 from .StrGather import *
-from .BuildEngine import BuildRule
+from .BuildEngine import BuildRuleObj as BuildRule
+from .BuildEngine import gDefaultBuildRuleFile,AutoGenReqBuildRuleVerNum
 import shutil
 from Common.LongFilePathSupport import CopyLongFilePath
 from Common.BuildToolError import *
 from Common.DataType import *
 from Common.Misc import *
@@ -76,16 +77,10 @@ gEfiVarStoreGuidPattern = re.compile("\s*guid\s*=\s*({.*?{.*?}\s*})")
 
 ## Mapping Makefile type
 gMakeTypeMap = {TAB_COMPILER_MSFT:"nmake", "GCC":"gmake"}
 
 
-## Build rule configuration file
-gDefaultBuildRuleFile = 'build_rule.txt'
-
-## Build rule default version
-AutoGenReqBuildRuleVerNum = "0.1"
-
 ## default file name for AutoGen
 gAutoGenCodeFileName = "AutoGen.c"
 gAutoGenHeaderFileName = "AutoGen.h"
 gAutoGenStringFileName = "%(module_name)sStrDefs.h"
 gAutoGenStringFormFileName = "%(module_name)sStrDefs.hpk"
@@ -1970,32 +1965,10 @@ class PlatformAutoGen(AutoGen):
     ## Return the build options specific for EDKII modules in this platform
     @cached_property
     def EdkIIBuildOption(self):
         return self._ExpandBuildOption(self.Platform.BuildOptions, EDKII_NAME)
 
-    ## Parse build_rule.txt in Conf Directory.
-    #
-    #   @retval     BuildRule object
-    #
-    @cached_property
-    def BuildRule(self):
-        BuildRuleFile = None
-        if TAB_TAT_DEFINES_BUILD_RULE_CONF in self.Workspace.TargetTxt.TargetTxtDictionary:
-            BuildRuleFile = self.Workspace.TargetTxt.TargetTxtDictionary[TAB_TAT_DEFINES_BUILD_RULE_CONF]
-        if not BuildRuleFile:
-            BuildRuleFile = gDefaultBuildRuleFile
-        RetVal = BuildRule(BuildRuleFile)
-        if RetVal._FileVersion == "":
-            RetVal._FileVersion = AutoGenReqBuildRuleVerNum
-        else:
-            if RetVal._FileVersion < AutoGenReqBuildRuleVerNum :
-                # If Build Rule's version is less than the version number required by the tools, halting the build.
-                EdkLogger.error("build", AUTOGEN_ERROR,
-                                ExtraData="The version number [%s] of build_rule.txt is less than the version number required by the AutoGen.(the minimum required version number is [%s])"\
-                                 % (RetVal._FileVersion, AutoGenReqBuildRuleVerNum))
-        return RetVal
-
     ## Summarize the packages used by modules in this platform
     @cached_property
     def PackageList(self):
         RetVal = set()
         for La in self.LibraryAutoGenList:
@@ -3149,11 +3122,11 @@ class ModuleAutoGen(AutoGen):
         return RetVal
 
     @cached_property
     def BuildRules(self):
         RetVal = {}
-        BuildRuleDatabase = self.PlatformInfo.BuildRule
+        BuildRuleDatabase = BuildRule
         for Type in BuildRuleDatabase.FileTypeList:
             #first try getting build rule by BuildRuleFamily
             RuleObject = BuildRuleDatabase[Type, self.BuildType, self.Arch, self.BuildRuleFamily]
             if not RuleObject:
                 # build type is always module type, but ...
diff --git a/BaseTools/Source/Python/AutoGen/BuildEngine.py b/BaseTools/Source/Python/AutoGen/BuildEngine.py
index 14e61140e7ba..bb9153447793 100644
--- a/BaseTools/Source/Python/AutoGen/BuildEngine.py
+++ b/BaseTools/Source/Python/AutoGen/BuildEngine.py
@@ -18,10 +18,13 @@ from Common.LongFilePathSupport import OpenLongFilePath as open
 from Common.GlobalData import *
 from Common.BuildToolError import *
 from Common.Misc import tdict, PathClass
 from Common.StringUtils import NormPath
 from Common.DataType import *
+from Common.TargetTxtClassObject import TargetTxt
+gDefaultBuildRuleFile = 'build_rule.txt'
+AutoGenReqBuildRuleVerNum = '0.1'
 
 import Common.EdkLogger as EdkLogger
 
 ## Convert file type to file list macro name
 #
@@ -581,10 +584,29 @@ class BuildRule:
         _ExtraDependency   : ParseCommonSubSection,
         _Command           : ParseCommonSubSection,
         _UnknownSection    : SkipSection,
     }
 
+def GetBuildRule():
+    BuildRuleFile = None
+    if TAB_TAT_DEFINES_BUILD_RULE_CONF in TargetTxt.TargetTxtDictionary:
+        BuildRuleFile = TargetTxt.TargetTxtDictionary[TAB_TAT_DEFINES_BUILD_RULE_CONF]
+    if not BuildRuleFile:
+        BuildRuleFile = gDefaultBuildRuleFile
+    RetVal = BuildRule(BuildRuleFile)
+    if RetVal._FileVersion == "":
+        RetVal._FileVersion = AutoGenReqBuildRuleVerNum
+    else:
+        if RetVal._FileVersion < AutoGenReqBuildRuleVerNum :
+            # If Build Rule's version is less than the version number required by the tools, halting the build.
+            EdkLogger.error("build", AUTOGEN_ERROR,
+                            ExtraData="The version number [%s] of build_rule.txt is less than the version number required by the AutoGen.(the minimum required version number is [%s])"\
+                             % (RetVal._FileVersion, AutoGenReqBuildRuleVerNum))
+    return RetVal
+
+BuildRuleObj = GetBuildRule()
+
 # This acts like the main() function for the script, unless it is 'import'ed into another
 # script.
 if __name__ == '__main__':
     import sys
     EdkLogger.Initialize()
diff --git a/BaseTools/Source/Python/Common/TargetTxtClassObject.py b/BaseTools/Source/Python/Common/TargetTxtClassObject.py
index 9d7673b41bb5..79a5acc01074 100644
--- a/BaseTools/Source/Python/Common/TargetTxtClassObject.py
+++ b/BaseTools/Source/Python/Common/TargetTxtClassObject.py
@@ -144,10 +144,12 @@ class TargetTxtClassObject(object):
 def TargetTxtDict(ConfDir):
     Target = TargetTxtClassObject()
     Target.LoadTargetTxtFile(os.path.normpath(os.path.join(ConfDir, gDefaultTargetTxtFile)))
     return Target
 
+TargetTxt = TargetTxtDict(os.path.join(os.getenv("WORKSPACE"),"Conf"))
+
 ##
 #
 # This acts like the main() function for the script, unless it is 'import'ed into another
 # script.
 #
diff --git a/BaseTools/Source/Python/Common/ToolDefClassObject.py b/BaseTools/Source/Python/Common/ToolDefClassObject.py
index 4fa364942cad..063fa005840a 100644
--- a/BaseTools/Source/Python/Common/ToolDefClassObject.py
+++ b/BaseTools/Source/Python/Common/ToolDefClassObject.py
@@ -12,11 +12,11 @@ from __future__ import absolute_import
 import Common.LongFilePathOs as os
 import re
 from . import EdkLogger
 
 from .BuildToolError import *
-from Common.TargetTxtClassObject import TargetTxtDict
+from Common.TargetTxtClassObject import TargetTxt
 from Common.LongFilePathSupport import OpenLongFilePath as open
 from Common.Misc import PathClass
 from Common.StringUtils import NormPath
 import Common.GlobalData as GlobalData
 from Common import GlobalData
@@ -261,11 +261,11 @@ class ToolDefClassObject(object):
 # @param ConfDir:  Conf dir
 #
 # @retval ToolDef An instance of ToolDefClassObject() with loaded tools_def.txt
 #
 def ToolDefDict(ConfDir):
-    Target = TargetTxtDict(ConfDir)
+    Target = TargetTxt
     ToolDef = ToolDefClassObject()
     if TAB_TAT_DEFINES_TOOL_CHAIN_CONF in Target.TargetTxtDictionary:
         ToolsDefFile = Target.TargetTxtDictionary[TAB_TAT_DEFINES_TOOL_CHAIN_CONF]
         if ToolsDefFile:
             ToolDef.LoadToolDefFile(os.path.normpath(ToolsDefFile))
@@ -273,10 +273,12 @@ def ToolDefDict(ConfDir):
             ToolDef.LoadToolDefFile(os.path.normpath(os.path.join(ConfDir, gDefaultToolsDefFile)))
     else:
         ToolDef.LoadToolDefFile(os.path.normpath(os.path.join(ConfDir, gDefaultToolsDefFile)))
     return ToolDef
 
+ToolDef = ToolDefDict((os.path.join(os.getenv("WORKSPACE"),"Conf")))
+
 ##
 #
 # This acts like the main() function for the script, unless it is 'import'ed into another
 # script.
 #
diff --git a/BaseTools/Source/Python/GenFds/GenFds.py b/BaseTools/Source/Python/GenFds/GenFds.py
index 5888997761bb..51943411ad1f 100644
--- a/BaseTools/Source/Python/GenFds/GenFds.py
+++ b/BaseTools/Source/Python/GenFds/GenFds.py
@@ -18,11 +18,11 @@ from glob import glob
 from struct import unpack
 from linecache import getlines
 from io import BytesIO
 
 import Common.LongFilePathOs as os
-from Common.TargetTxtClassObject import TargetTxtClassObject
+from Common.TargetTxtClassObject import TargetTxt
 from Common.DataType import *
 import Common.GlobalData as GlobalData
 from Common import EdkLogger
 from Common.StringUtils import NormPath
 from Common.Misc import DirCache, PathClass, GuidStructureStringToGuidString
@@ -205,12 +205,10 @@ def GenFdsApi(FdsCommandDict, WorkSpaceDataBase=None):
         GenFdsGlobalVariable.ConfDir = ConfDirectoryPath
         if not GlobalData.gConfDirectory:
             GlobalData.gConfDirectory = GenFdsGlobalVariable.ConfDir
         BuildConfigurationFile = os.path.normpath(os.path.join(ConfDirectoryPath, "target.txt"))
         if os.path.isfile(BuildConfigurationFile) == True:
-            TargetTxt = TargetTxtClassObject()
-            TargetTxt.LoadTargetTxtFile(BuildConfigurationFile)
             # if no build target given in command line, get it from target.txt
             if not GenFdsGlobalVariable.TargetName:
                 BuildTargetList = TargetTxt.TargetTxtDictionary[TAB_TAT_DEFINES_TARGET]
                 if len(BuildTargetList) != 1:
                     EdkLogger.error("GenFds", OPTION_VALUE_INVALID, ExtraData="Only allows one instance for Target.")
diff --git a/BaseTools/Source/Python/GenFds/GenFdsGlobalVariable.py b/BaseTools/Source/Python/GenFds/GenFdsGlobalVariable.py
index f43743dff4d1..037828ea1cca 100644
--- a/BaseTools/Source/Python/GenFds/GenFdsGlobalVariable.py
+++ b/BaseTools/Source/Python/GenFds/GenFdsGlobalVariable.py
@@ -20,13 +20,13 @@ from array import array
 
 from Common.BuildToolError import COMMAND_FAILURE,GENFDS_ERROR
 from Common import EdkLogger
 from Common.Misc import SaveFileOnChange
 
-from Common.TargetTxtClassObject import TargetTxtClassObject
-from Common.ToolDefClassObject import ToolDefClassObject, ToolDefDict
-from AutoGen.BuildEngine import BuildRule
+from Common.TargetTxtClassObject import TargetTxt
+from Common.ToolDefClassObject import ToolDef
+from AutoGen.BuildEngine import BuildRuleObj
 import Common.DataType as DataType
 from Common.Misc import PathClass
 from Common.LongFilePathSupport import OpenLongFilePath as open
 from Common.MultipleWorkspace import MultipleWorkspace as mws
 import Common.GlobalData as GlobalData
@@ -93,35 +93,25 @@ class GenFdsGlobalVariable:
     #
     @staticmethod
     def _LoadBuildRule():
         if GenFdsGlobalVariable.__BuildRuleDatabase:
             return GenFdsGlobalVariable.__BuildRuleDatabase
-        BuildConfigurationFile = os.path.normpath(os.path.join(GenFdsGlobalVariable.ConfDir, "target.txt"))
-        TargetTxt = TargetTxtClassObject()
-        if os.path.isfile(BuildConfigurationFile) == True:
-            TargetTxt.LoadTargetTxtFile(BuildConfigurationFile)
-            if DataType.TAB_TAT_DEFINES_BUILD_RULE_CONF in TargetTxt.TargetTxtDictionary:
-                BuildRuleFile = TargetTxt.TargetTxtDictionary[DataType.TAB_TAT_DEFINES_BUILD_RULE_CONF]
-            if not BuildRuleFile:
-                BuildRuleFile = 'Conf/build_rule.txt'
-            GenFdsGlobalVariable.__BuildRuleDatabase = BuildRule(BuildRuleFile)
-            ToolDefinitionFile = TargetTxt.TargetTxtDictionary[DataType.TAB_TAT_DEFINES_TOOL_CHAIN_CONF]
-            if ToolDefinitionFile == '':
-                ToolDefinitionFile = "Conf/tools_def.txt"
-            if os.path.isfile(ToolDefinitionFile):
-                ToolDef = ToolDefClassObject()
-                ToolDef.LoadToolDefFile(ToolDefinitionFile)
-                ToolDefinition = ToolDef.ToolsDefTxtDatabase
-                if DataType.TAB_TOD_DEFINES_BUILDRULEFAMILY in ToolDefinition \
-                   and GenFdsGlobalVariable.ToolChainTag in ToolDefinition[DataType.TAB_TOD_DEFINES_BUILDRULEFAMILY] \
-                   and ToolDefinition[DataType.TAB_TOD_DEFINES_BUILDRULEFAMILY][GenFdsGlobalVariable.ToolChainTag]:
-                    GenFdsGlobalVariable.BuildRuleFamily = ToolDefinition[DataType.TAB_TOD_DEFINES_BUILDRULEFAMILY][GenFdsGlobalVariable.ToolChainTag]
+        GenFdsGlobalVariable.__BuildRuleDatabase = BuildRuleObj
+        ToolDefinitionFile = TargetTxt.TargetTxtDictionary[DataType.TAB_TAT_DEFINES_TOOL_CHAIN_CONF]
+        if ToolDefinitionFile == '':
+            ToolDefinitionFile = "Conf/tools_def.txt"
+        if os.path.isfile(ToolDefinitionFile):
+            ToolDefinition = ToolDef.ToolsDefTxtDatabase
+            if DataType.TAB_TOD_DEFINES_BUILDRULEFAMILY in ToolDefinition \
+               and GenFdsGlobalVariable.ToolChainTag in ToolDefinition[DataType.TAB_TOD_DEFINES_BUILDRULEFAMILY] \
+               and ToolDefinition[DataType.TAB_TOD_DEFINES_BUILDRULEFAMILY][GenFdsGlobalVariable.ToolChainTag]:
+                GenFdsGlobalVariable.BuildRuleFamily = ToolDefinition[DataType.TAB_TOD_DEFINES_BUILDRULEFAMILY][GenFdsGlobalVariable.ToolChainTag]
 
-                if DataType.TAB_TOD_DEFINES_FAMILY in ToolDefinition \
-                   and GenFdsGlobalVariable.ToolChainTag in ToolDefinition[DataType.TAB_TOD_DEFINES_FAMILY] \
-                   and ToolDefinition[DataType.TAB_TOD_DEFINES_FAMILY][GenFdsGlobalVariable.ToolChainTag]:
-                    GenFdsGlobalVariable.ToolChainFamily = ToolDefinition[DataType.TAB_TOD_DEFINES_FAMILY][GenFdsGlobalVariable.ToolChainTag]
+            if DataType.TAB_TOD_DEFINES_FAMILY in ToolDefinition \
+               and GenFdsGlobalVariable.ToolChainTag in ToolDefinition[DataType.TAB_TOD_DEFINES_FAMILY] \
+               and ToolDefinition[DataType.TAB_TOD_DEFINES_FAMILY][GenFdsGlobalVariable.ToolChainTag]:
+                GenFdsGlobalVariable.ToolChainFamily = ToolDefinition[DataType.TAB_TOD_DEFINES_FAMILY][GenFdsGlobalVariable.ToolChainTag]
         return GenFdsGlobalVariable.__BuildRuleDatabase
 
     ## GetBuildRules
     #    @param Inf: object of InfBuildData
     #    @param Arch: current arch
@@ -837,11 +827,11 @@ class GenFdsGlobalVariable:
 #  @param  KeyStringList    Filter for inputs of section generation
 #  @param  CurrentArchList  Arch list
 #  @param  NameGuid         The Guid name
 #
 def FindExtendTool(KeyStringList, CurrentArchList, NameGuid):
-    ToolDb = ToolDefDict(GenFdsGlobalVariable.ConfDir).ToolsDefTxtDatabase
+    ToolDb = ToolDef.ToolsDefTxtDatabase
     # if user not specify filter, try to deduce it from global data.
     if KeyStringList is None or KeyStringList == []:
         Target = GenFdsGlobalVariable.TargetName
         ToolChain = GenFdsGlobalVariable.ToolChainTag
         if ToolChain not in ToolDb['TOOL_CHAIN_TAG']:
@@ -853,19 +843,19 @@ def FindExtendTool(KeyStringList, CurrentArchList, NameGuid):
 
     if GenFdsGlobalVariable.GuidToolDefinition:
         if NameGuid in GenFdsGlobalVariable.GuidToolDefinition:
             return GenFdsGlobalVariable.GuidToolDefinition[NameGuid]
 
-    ToolDefinition = ToolDefDict(GenFdsGlobalVariable.ConfDir).ToolsDefTxtDictionary
+    ToolDefinition = ToolDef.ToolsDefTxtDictionary
     ToolPathTmp = None
     ToolOption = None
     ToolPathKey = None
     ToolOptionKey = None
     KeyList = None
-    for ToolDef in ToolDefinition.items():
-        if NameGuid.lower() == ToolDef[1].lower():
-            KeyList = ToolDef[0].split('_')
+    for tool_def in ToolDefinition.items():
+        if NameGuid.lower() == tool_def[1].lower():
+            KeyList = tool_def[0].split('_')
             Key = KeyList[0] + \
                   '_' + \
                   KeyList[1] + \
                   '_' + \
                   KeyList[2]
diff --git a/BaseTools/Source/Python/Workspace/DscBuildData.py b/BaseTools/Source/Python/Workspace/DscBuildData.py
index 985f8775259d..e7ec2aba57d2 100644
--- a/BaseTools/Source/Python/Workspace/DscBuildData.py
+++ b/BaseTools/Source/Python/Workspace/DscBuildData.py
@@ -17,12 +17,12 @@ from Common.StringUtils import *
 from Common.DataType import *
 from Common.Misc import *
 from types import *
 from Common.Expression import *
 from CommonDataClass.CommonClass import SkuInfoClass
-from Common.TargetTxtClassObject import TargetTxtClassObject
-from Common.ToolDefClassObject import ToolDefClassObject
+from Common.TargetTxtClassObject import TargetTxt
+from Common.ToolDefClassObject import ToolDef
 from .MetaDataTable import *
 from .MetaFileTable import *
 from .MetaFileParser import *
 
 from .WorkspaceCommon import GetDeclaredPcd
@@ -3260,19 +3260,15 @@ class DscBuildData(PlatformBuildClassObject):
     @property
     def ToolChainFamily(self):
         self._ToolChainFamily = TAB_COMPILER_MSFT
         BuildConfigurationFile = os.path.normpath(os.path.join(GlobalData.gConfDirectory, "target.txt"))
         if os.path.isfile(BuildConfigurationFile) == True:
-            TargetTxt      = TargetTxtClassObject()
-            TargetTxt.LoadTargetTxtFile(BuildConfigurationFile)
             ToolDefinitionFile = TargetTxt.TargetTxtDictionary[DataType.TAB_TAT_DEFINES_TOOL_CHAIN_CONF]
             if ToolDefinitionFile == '':
                 ToolDefinitionFile = "tools_def.txt"
                 ToolDefinitionFile = os.path.normpath(mws.join(self.WorkspaceDir, 'Conf', ToolDefinitionFile))
             if os.path.isfile(ToolDefinitionFile) == True:
-                ToolDef        = ToolDefClassObject()
-                ToolDef.LoadToolDefFile(ToolDefinitionFile)
                 ToolDefinition = ToolDef.ToolsDefTxtDatabase
                 if TAB_TOD_DEFINES_FAMILY not in ToolDefinition \
                    or self._Toolchain not in ToolDefinition[TAB_TOD_DEFINES_FAMILY] \
                    or not ToolDefinition[TAB_TOD_DEFINES_FAMILY][self._Toolchain]:
                     self._ToolChainFamily = TAB_COMPILER_MSFT
diff --git a/BaseTools/Source/Python/build/build.py b/BaseTools/Source/Python/build/build.py
index 6bc528974db1..07693b97359e 100644
--- a/BaseTools/Source/Python/build/build.py
+++ b/BaseTools/Source/Python/build/build.py
@@ -28,12 +28,12 @@ import threading
 from optparse import OptionParser
 from subprocess import *
 from Common import Misc as Utils
 
 from Common.LongFilePathSupport import OpenLongFilePath as open
-from Common.TargetTxtClassObject import TargetTxtClassObject
-from Common.ToolDefClassObject import ToolDefClassObject
+from Common.TargetTxtClassObject import TargetTxt
+from Common.ToolDefClassObject import ToolDef
 from Common.DataType import *
 from Common.BuildVersion import gBUILD_VERSION
 from AutoGen.AutoGen import *
 from Common.BuildToolError import *
 from Workspace.WorkspaceDatabase import WorkspaceDatabase
@@ -714,12 +714,12 @@ class Build():
         if self.SkuId:
             GlobalData.gSKUID_CMD = self.SkuId
         self.ConfDirectory = BuildOptions.ConfDirectory
         self.SpawnMode      = True
         self.BuildReport    = BuildReport(BuildOptions.ReportFile, BuildOptions.ReportType)
-        self.TargetTxt      = TargetTxtClassObject()
-        self.ToolDef        = ToolDefClassObject()
+        self.TargetTxt      = TargetTxt
+        self.ToolDef        = ToolDef
         self.AutoGenTime    = 0
         self.MakeTime       = 0
         self.GenFdsTime     = 0
         GlobalData.BuildOptionPcd     = BuildOptions.OptionPcd if BuildOptions.OptionPcd else []
         #Set global flag for build mode
@@ -814,12 +814,12 @@ class Build():
             EdkLogger.quiet("%-16s = %s" % ("PREBUILD", self.Prebuild))
         if self.Postbuild:
             EdkLogger.quiet("%-16s = %s" % ("POSTBUILD", self.Postbuild))
         if self.Prebuild:
             self.LaunchPrebuild()
-            self.TargetTxt = TargetTxtClassObject()
-            self.ToolDef   = ToolDefClassObject()
+            self.TargetTxt = TargetTxt
+            self.ToolDef   = ToolDef
         if not (self.LaunchPrebuildFlag and os.path.exists(self.PlatformBuildPath)):
             self.InitBuild()
 
         EdkLogger.info("")
         os.chdir(self.WorkspaceDir)
@@ -827,27 +827,10 @@ class Build():
     ## Load configuration
     #
     #   This method will parse target.txt and get the build configurations.
     #
     def LoadConfiguration(self):
-        #
-        # Check target.txt and tools_def.txt and Init them
-        #
-        BuildConfigurationFile = os.path.normpath(os.path.join(GlobalData.gConfDirectory, gBuildConfiguration))
-        if os.path.isfile(BuildConfigurationFile) == True:
-            StatusCode = self.TargetTxt.LoadTargetTxtFile(BuildConfigurationFile)
-
-            ToolDefinitionFile = self.TargetTxt.TargetTxtDictionary[TAB_TAT_DEFINES_TOOL_CHAIN_CONF]
-            if ToolDefinitionFile == '':
-                ToolDefinitionFile = gToolsDefinition
-                ToolDefinitionFile = os.path.normpath(mws.join(self.WorkspaceDir, 'Conf', ToolDefinitionFile))
-            if os.path.isfile(ToolDefinitionFile) == True:
-                StatusCode = self.ToolDef.LoadToolDefFile(ToolDefinitionFile)
-            else:
-                EdkLogger.error("build", FILE_NOT_FOUND, ExtraData=ToolDefinitionFile)
-        else:
-            EdkLogger.error("build", FILE_NOT_FOUND, ExtraData=BuildConfigurationFile)
 
         # if no ARCH given in command line, get it from target.txt
         if not self.ArchList:
             self.ArchList = self.TargetTxt.TargetTxtDictionary[TAB_TAT_DEFINES_TARGET_ARCH]
         self.ArchList = tuple(self.ArchList)
-- 
2.20.1.windows.1