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-rw-r--r--clang/include/clang/Frontend/ASTUnit.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/clang/include/clang/Frontend/ASTUnit.h b/clang/include/clang/Frontend/ASTUnit.h
index 041eabb5b99..c22a18bd1c0 100644
--- a/clang/include/clang/Frontend/ASTUnit.h
+++ b/clang/include/clang/Frontend/ASTUnit.h
@@ -396,7 +396,9 @@ private:
/// just about any usage.
/// Becomes a noop in release mode; only useful for debug mode checking.
class ConcurrencyState {
+#ifndef NDEBUG
void *Mutex; // a llvm::sys::MutexImpl in debug;
+#endif
public:
ConcurrencyState();
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