[clangd] Attempt the fix the buildbots after r333737

llvm-svn: 333742

1 files changed, 4 insertions, 1 deletions

diff --git a/clang-tools-extra/clangd/TUScheduler.cpp b/clang-tools-extra/clangd/TUScheduler.cpp
index c6b11437d31..795023cfa4f 100644
--- a/clang-tools-extra/clangd/TUScheduler.cpp
+++ b/clang-tools-extra/clangd/TUScheduler.cpp
@@ -110,7 +110,10 @@ public:
       return llvm::None;
     std::unique_ptr<ParsedAST> V = std::move(Existing->second);
     LRU.erase(Existing);
-    return V;
+    // GCC 4.8 fails to compile `return V;`, as it tries to call the copy
+    // constructor of unique_ptr, so we call the move ctor explicitly to avoid
+    // this miscompile.
+    return llvm::Optional<std::unique_ptr<ParsedAST>>(std::move(V));
   }
 
 private: