Teach ASTReader how to read only the Preprocessor state from an AST file, not the ASTContext state.

We use this when running a preprocessor-only action on an AST file in order to
avoid paying the runtime cost of loading the extra information.

llvm-svn: 306760

1 files changed, 3 insertions, 3 deletions

diff --git a/clang/lib/Frontend/ASTMerge.cpp b/clang/lib/Frontend/ASTMerge.cpp
index 986f98ae598..354527db7ba 100644
--- a/clang/lib/Frontend/ASTMerge.cpp
+++ b/clang/lib/Frontend/ASTMerge.cpp
@@ -44,9 +44,9 @@ void ASTMergeAction::ExecuteAction() {
                                     new ForwardingDiagnosticConsumer(
                                           *CI.getDiagnostics().getClient()),
                                     /*ShouldOwnClient=*/true));
-    std::unique_ptr<ASTUnit> Unit =
-        ASTUnit::LoadFromASTFile(ASTFiles[I], CI.getPCHContainerReader(),
-                                 Diags, CI.getFileSystemOpts(), false);
+    std::unique_ptr<ASTUnit> Unit = ASTUnit::LoadFromASTFile(
+        ASTFiles[I], CI.getPCHContainerReader(), ASTUnit::LoadEverything, Diags,
+        CI.getFileSystemOpts(), false);
 
     if (!Unit)
       continue;