[Patch] BaseTools: PCD can only use single access method by source build

[Yonghong Zhu <yonghong.zhu@intel.com>]

Add the error check that A PCD can only use one type for all source
modules.

Cc: Liming Gao <liming.gao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Yonghong Zhu <yonghong.zhu@intel.com>
---
 BaseTools/Source/Python/AutoGen/AutoGen.py | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/BaseTools/Source/Python/AutoGen/AutoGen.py b/BaseTools/Source/Python/AutoGen/AutoGen.py
index 8075afc..205a75d 100644
--- a/BaseTools/Source/Python/AutoGen/AutoGen.py
+++ b/BaseTools/Source/Python/AutoGen/AutoGen.py
@@ -502,10 +502,26 @@ class WorkspaceAutoGen(AutoGen):
                         elif 'FixedAtBuild' in BuildData.Pcds[key].Type:
                             if (BuildData.Pcds[key].TokenCName, BuildData.Pcds[key].TokenSpaceGuidCName) not in SourcePcdDict['FixedAtBuild']:
                                 SourcePcdDict['FixedAtBuild'].append((BuildData.Pcds[key].TokenCName, BuildData.Pcds[key].TokenSpaceGuidCName))
                 else:
                     pass
+            #
+            # A PCD can only use one type for all source modules
+            #
+            for i in SourcePcdDict_Keys:
+                for j in SourcePcdDict_Keys:
+                    if i != j:
+                        IntersectionList = list(set(SourcePcdDict[i]).intersection(set(SourcePcdDict[j])))
+                        if len(IntersectionList) > 0:
+                            EdkLogger.error(
+                            'build',
+                            FORMAT_INVALID,
+                            "Building modules from source INFs, following PCD use %s and %s access method. It must be corrected to use only one access method." % (i, j),
+                            ExtraData="%s" % '\n\t'.join([str(P[1]+'.'+P[0]) for P in IntersectionList])
+                            )
+                    else:
+                        pass
 
             #
             # intersection the BinaryPCD for Mixed PCD
             #
             for i in BinaryPcdDict_Keys:
-- 
2.6.1.windows.1