fcl-passrc: check used unit reference for duplicate, in case unit is found via different names

git-svn-id: trunk@42704 -

packages/fcl-passrc/src/pparser.pp

@@ -3750,7 +3750,7 @@ function TPasParser.AddUseUnit(ASection: TPasSection;
   const NamePos: TPasSourcePos; AUnitName: string; NameExpr: TPasExpr;
   InFileExpr: TPrimitiveExpr): TPasUsesUnit;
 
-  procedure CheckDuplicateInUsesList(AUnitName : string; UsesClause: TPasUsesClause);
+  procedure CheckDuplicateInUsesList(UsesClause: TPasUsesClause);
   var
     i: Integer;
   begin
@@ -3760,6 +3760,16 @@ function TPasParser.AddUseUnit(ASection: TPasSection;
         ParseExc(nParserDuplicateIdentifier,SParserDuplicateIdentifier,[AUnitName]);
   end;
 
+  procedure CheckDuplicateInUsesList(UnitRef: TPasElement; UsesClause: TPasUsesClause);
+  var
+    i: Integer;
+  begin
+    if UsesClause=nil then exit;
+    for i:=0 to length(UsesClause)-1 do
+      if UsesClause[i].Module=UnitRef then
+        ParseExc(nParserDuplicateIdentifier,SParserDuplicateIdentifier,[AUnitName]);
+  end;
+
 var
   UnitRef: TPasElement;
   UsesUnit: TPasUsesUnit;
@@ -3777,16 +3787,23 @@ begin
         exit; // for compatibility ignore implicit use of system in system
       ParseExc(nParserDuplicateIdentifier,SParserDuplicateIdentifier,[AUnitName]);
       end;
-    CheckDuplicateInUsesList(AUnitName,ASection.UsesClause);
-    if ASection.ClassType=TImplementationSection then
-      CheckDuplicateInUsesList(AUnitName,CurModule.InterfaceSection.UsesClause);
 
     UnitRef := Engine.FindModule(AUnitName,NameExpr,InFileExpr);
     if Assigned(UnitRef) then
-      UnitRef.AddRef{$IFDEF CheckPasTreeRefCount}('TPasUsesUnit.Module'){$ENDIF}
+      begin
+      UnitRef.AddRef{$IFDEF CheckPasTreeRefCount}('TPasUsesUnit.Module'){$ENDIF};
+      CheckDuplicateInUsesList(UnitRef,ASection.UsesClause);
+      if ASection.ClassType=TImplementationSection then
+        CheckDuplicateInUsesList(UnitRef,CurModule.InterfaceSection.UsesClause);
+      end
     else
+      begin
+      CheckDuplicateInUsesList(ASection.UsesClause);
+      if ASection.ClassType=TImplementationSection then
+        CheckDuplicateInUsesList(CurModule.InterfaceSection.UsesClause);
       UnitRef := TPasUnresolvedUnitRef(CreateElement(TPasUnresolvedUnitRef,
         AUnitName, ASection, NamePos));
+      end;
 
     UsesUnit:=TPasUsesUnit(CreateElement(TPasUsesUnit,AUnitName,ASection,NamePos));
     Result:=ASection.AddUnitToUsesList(AUnitName,NameExpr,InFileExpr,UnitRef,UsesUnit);

packages/fcl-passrc/tests/tcresolver.pas

@@ -360,6 +360,7 @@ type
     Procedure TestUnitUseIntf;
     Procedure TestUnitUseImplFail;
     Procedure TestUnit_DuplicateUsesFail;
+    Procedure TestUnit_DuplicateUsesIntfImplFail;
     Procedure TestUnit_NestedFail;
     Procedure TestUnitUseDotted;
     Procedure TestUnit_ProgramDefaultNamespace;
@@ -5674,6 +5675,28 @@ begin
     nParserDuplicateIdentifier);
 end;
 
+procedure TTestResolver.TestUnit_DuplicateUsesIntfImplFail;
+begin
+  AddModuleWithIntfImplSrc('unit2.pp',
+    LinesToStr([
+    'type number = longint;']),
+    LinesToStr([
+    '']));
+
+  StartUnit(true);
+  Add([
+  'interface',
+  'uses unit2;',
+  'var j: number;',
+  'implementation',
+  'uses unit2;',
+  'initialization',
+  '  if number(3) then ;',
+  '']);
+  CheckParserException('Duplicate identifier "unit2" at token ";" in file afile.pp at line 6 column 11',
+    nParserDuplicateIdentifier);
+end;
+
 procedure TTestResolver.TestUnit_NestedFail;
 begin
   AddModuleWithIntfImplSrc('unit2.pp',