1 files changed, 15 insertions, 0 deletions
diff --git a/lib/Serialization/ASTReader.cpp b/lib/Serialization/ASTReader.cpp
index 55cb670f427e4..b7bbb9dc7be11 100644
--- a/lib/Serialization/ASTReader.cpp
+++ b/lib/Serialization/ASTReader.cpp
@@ -2925,6 +2925,21 @@ ASTReader::ReadASTBlock(ModuleFile &F, unsigned ClientLoadCapabilities) {
       }
       break;
 
+    case PP_CONDITIONAL_STACK:
+      if (!Record.empty()) {
+        SmallVector<PPConditionalInfo, 4> ConditionalStack;
+        for (unsigned Idx = 0, N = Record.size() - 1; Idx < N; /* in loop */) {
+          auto Loc = ReadSourceLocation(F, Record, Idx);
+          bool WasSkipping = Record[Idx++];
+          bool FoundNonSkip = Record[Idx++];
+          bool FoundElse = Record[Idx++];
+          ConditionalStack.push_back(
+              {Loc, WasSkipping, FoundNonSkip, FoundElse});
+        }
+        PP.setReplayablePreambleConditionalStack(ConditionalStack);
+      }
+      break;
+
     case PP_COUNTER_VALUE:
       if (!Record.empty() && Listener)
         Listener->ReadCounter(F, Record[0]);