Felix,

I agree. I filed a new  BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=1557 
to track the document update.
I think this new behavior would be better to be recorded in the Build spec.

Thanks,
Bob
-----Original Message-----
From: Felix Polyudov [mailto:fel...@ami.com] 
Sent: Saturday, February 23, 2019 6:06 AM
To: Feng, Bob C <bob.c.f...@intel.com>; edk2-devel@lists.01.org
Cc: Carsey, Jaben <jaben.car...@intel.com>; Gao, Liming <liming....@intel.com>
Subject: RE: [edk2] [Patch] BaseTools: Enable component override functionality

Bob,

Do you know if DSC specification has been updated to document this new behavior?
If not, it should be updated.

-----Original Message-----
From: edk2-devel [mailto:edk2-devel-boun...@lists.01.org] On Behalf Of BobCF
Sent: Thursday, January 10, 2019 9:39 PM
To: edk2-devel@lists.01.org
Cc: Carsey Jaben; Liming Gao
Subject: [edk2] [Patch] BaseTools: Enable component override functionality

https://bugzilla.tianocore.org/show_bug.cgi?id=1449
This patch enable build tools to recognize that when two given files have the 
same GUID, file path and ARCH in Dsc, The later one's definition will be used.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Bob Feng <bob.c.f...@intel.com>
Cc: Liming Gao <liming....@intel.com>
Cc: Carsey Jaben <jaben.car...@intel.com>
---
 .../Source/Python/Workspace/DscBuildData.py   | 24 ++++++++++++-------
 .../Source/Python/Workspace/MetaFileParser.py |  5 ++++  
.../Source/Python/Workspace/MetaFileTable.py  |  7 ++++--
 3 files changed, 25 insertions(+), 11 deletions(-)

diff --git a/BaseTools/Source/Python/Workspace/DscBuildData.py 
b/BaseTools/Source/Python/Workspace/DscBuildData.py
index 7e82e8e934..f9805f58f5 100644
--- a/BaseTools/Source/Python/Workspace/DscBuildData.py
+++ b/BaseTools/Source/Python/Workspace/DscBuildData.py
@@ -704,36 +704,44 @@ class DscBuildData(PlatformBuildClassObject):
             if TAB_DEFAULT_STORES_DEFAULT not in self.DefaultStores:
                 self.DefaultStores[TAB_DEFAULT_STORES_DEFAULT] = (0, 
TAB_DEFAULT_STORES_DEFAULT)
             GlobalData.gDefaultStores = sorted(self.DefaultStores.keys())
         return self.DefaultStores
 
+    def OverrideDuplicateModule(self):
+        RecordList = self._RawData[MODEL_META_DATA_COMPONENT, self._Arch]
+        Macros = self._Macros
+        Macros["EDK_SOURCE"] = GlobalData.gEcpSource
+        Components = {}
+        for Record in RecordList:
+            ModuleId = Record[6]
+            file_guid = self._RawData[MODEL_META_DATA_HEADER, self._Arch, 
None, ModuleId]
+            file_guid_str = file_guid[0][2] if file_guid else "NULL"
+            ModuleFile = PathClass(NormPath(Record[0], Macros), 
GlobalData.gWorkspace, Arch=self._Arch)
+            if self._Arch != TAB_ARCH_COMMON and 
(file_guid_str,str(ModuleFile)) in Components:
+                
self._RawData.DisableOverrideComponent(Components[(file_guid_str,str(ModuleFile))])
+            Components[(file_guid_str,str(ModuleFile))] = ModuleId
+        self._RawData._PostProcessed = False
     ## Retrieve [Components] section information
     @property
     def Modules(self):
         if self._Modules is not None:
             return self._Modules
-
+        self.OverrideDuplicateModule()
         self._Modules = OrderedDict()
         RecordList = self._RawData[MODEL_META_DATA_COMPONENT, self._Arch]
         Macros = self._Macros
         Macros["EDK_SOURCE"] = GlobalData.gEcpSource
         for Record in RecordList:
-            DuplicatedFile = False
-
             ModuleFile = PathClass(NormPath(Record[0], Macros), 
GlobalData.gWorkspace, Arch=self._Arch)
             ModuleId = Record[6]
             LineNo = Record[7]
 
             # check the file validation
             ErrorCode, ErrorInfo = ModuleFile.Validate('.inf')
             if ErrorCode != 0:
                 EdkLogger.error('build', ErrorCode, File=self.MetaFile, 
Line=LineNo,
                                 ExtraData=ErrorInfo)
-            # Check duplication
-            # If arch is COMMON, no duplicate module is checked since all 
modules in all component sections are selected
-            if self._Arch != TAB_ARCH_COMMON and ModuleFile in self._Modules:
-                DuplicatedFile = True
 
             Module = ModuleBuildClassObject()
             Module.MetaFile = ModuleFile
 
             # get module private library instance @@ -792,12 +800,10 @@ class 
DscBuildData(PlatformBuildClassObject):
                 else:
                     OptionString = Module.BuildOptions[ToolChainFamily, 
ToolChain]
                     Module.BuildOptions[ToolChainFamily, ToolChain] = 
OptionString + " " + Option
 
             RecordList = self._RawData[MODEL_META_DATA_HEADER, self._Arch, 
None, ModuleId]
-            if DuplicatedFile and not RecordList:
-                EdkLogger.error('build', FILE_DUPLICATED, File=self.MetaFile, 
ExtraData=str(ModuleFile), Line=LineNo)
             if RecordList:
                 if len(RecordList) != 1:
                     EdkLogger.error('build', OPTION_UNKNOWN, 'Only FILE_GUID 
can be listed in <Defines> section.',
                                     File=self.MetaFile, 
ExtraData=str(ModuleFile), Line=LineNo)
                 ModuleFile = ProcessDuplicatedInf(ModuleFile, 
RecordList[0][2], GlobalData.gWorkspace) diff --git 
a/BaseTools/Source/Python/Workspace/MetaFileParser.py 
b/BaseTools/Source/Python/Workspace/MetaFileParser.py
index 032220813b..a52e9229df 100644
--- a/BaseTools/Source/Python/Workspace/MetaFileParser.py
+++ b/BaseTools/Source/Python/Workspace/MetaFileParser.py
@@ -1711,10 +1711,15 @@ class DscParser(MetaFileParser):
 
     def __ProcessBuildOption(self):
         self._ValueList = [ReplaceMacro(Value, self._Macros, RaiseError=False)
                            for Value in self._ValueList]
 
+    def DisableOverrideComponent(self,module_id):
+        for ori_id in self._IdMapping:
+            if self._IdMapping[ori_id] == module_id:
+                self._RawTable.DisableComponent(ori_id)
+
     _SectionParser = {
         MODEL_META_DATA_HEADER                          :   _DefineParser,
         MODEL_EFI_SKU_ID                                :   _SkuIdParser,
         MODEL_EFI_DEFAULT_STORES                        :   
_DefaultStoresParser,
         MODEL_EFI_LIBRARY_INSTANCE                      :   
_LibraryInstanceParser,
diff --git a/BaseTools/Source/Python/Workspace/MetaFileTable.py 
b/BaseTools/Source/Python/Workspace/MetaFileTable.py
index 004e9494c3..823a87e057 100644
--- a/BaseTools/Source/Python/Workspace/MetaFileTable.py
+++ b/BaseTools/Source/Python/Workspace/MetaFileTable.py
@@ -74,11 +74,11 @@ class MetaFileTable():
 
     def SetEndFlag(self):
         self.CurrentContent.append(self._DUMMY_)
 
     def GetAll(self):
-        return [item for item in self.CurrentContent if item[0] >= 0 ]
+        return [item for item in self.CurrentContent if item[0] >= 0 
+ and item[-1]>=0]
 
 ## Python class representation of table storing module data  class 
ModuleTable(MetaFileTable):
     _COLUMN_ = '''
         ID REAL PRIMARY KEY,
@@ -371,11 +371,10 @@ class PlatformTable(MetaFileTable):
     #
     def Query(self, Model, Scope1=None, Scope2=None, BelongsToItem=None, 
FromItem=None):
 
         QueryTab = self.CurrentContent
         result = [item for item in QueryTab if item[1] == Model and item[-1]>0 
]
-
         if Scope1 is not None and Scope1 != TAB_ARCH_COMMON:
             Sc1 = set(['COMMON'])
             Sc1.add(Scope1)
             result = [item for item in result if item[5] in Sc1]
         Sc2 = set( ['COMMON','DEFAULT']) @@ -395,10 +394,14 @@ class 
PlatformTable(MetaFileTable):
             result = [item for item in result if item[9] == FromItem]
 
         result = [ [r[2],r[3],r[4],r[5],r[6],r[7],r[0],r[9]] for r in result ]
         return result
 
+    def DisableComponent(self,comp_id):
+        for item in self.CurrentContent:
+            if item[0] == comp_id or item[8] == comp_id:
+                item[-1] = -1
 
 ## Factory class to produce different storage for different type of meta-file  
class MetaFileStorage(object):
     _FILE_TABLE_ = {
         MODEL_FILE_INF      :   ModuleTable,
--
2.19.1.windows.1

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