2 files changed, 0 insertions, 8 deletions
diff --git a/clang/lib/Serialization/ASTReader.cpp b/clang/lib/Serialization/ASTReader.cpp
index 7774b7b1c6e..bb6a450222d 100644
--- a/clang/lib/Serialization/ASTReader.cpp
+++ b/clang/lib/Serialization/ASTReader.cpp
@@ -3468,13 +3468,6 @@ ASTReader::ReadModuleMapFileBlock(RecordData &Record, ModuleFile &F,
           << F.ModuleName << /*not new*/1 << ModMap->getName();
       return OutOfDate;
     }
-
-    // Check whether the 'IsSystem' bit changed.
-    if (M->IsSystem != static_cast<bool>(Record[Idx])) {
-      if ((ClientLoadCapabilities & ARR_OutOfDate) == 0)
-        Diag(diag::err_module_system_change) << F.ModuleName << M->IsSystem;
-      return OutOfDate;
-    }
   }
 
   if (Listener)
diff --git a/clang/lib/Serialization/ASTWriter.cpp b/clang/lib/Serialization/ASTWriter.cpp
index c0ce5f8e5ca..07d5d29e44b 100644
--- a/clang/lib/Serialization/ASTWriter.cpp
+++ b/clang/lib/Serialization/ASTWriter.cpp
@@ -1216,7 +1216,6 @@ void ASTWriter::WriteControlBlock(Preprocessor &PP, ASTContext &Context,
       Record.push_back(0);
     }
 
-    Record.push_back(WritingModule->IsSystem);
     Stream.EmitRecord(MODULE_MAP_FILE, Record);
   }