From ecf9a18e45dd06fc92428f65bcd6c46c6ee44c2f Mon Sep 17 00:00:00 2001
From: Steve Lord <steve.lord@dremio.com>
Date: Fri, 14 Jun 2024 12:53:20 -0700
Subject: [PATCH] Fix namespace

---
 cpp/src/gandiva/engine.cc | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/cpp/src/gandiva/engine.cc b/cpp/src/gandiva/engine.cc
index 7d5fafce55623..59a7fc912df50 100644
--- a/cpp/src/gandiva/engine.cc
+++ b/cpp/src/gandiva/engine.cc
@@ -180,8 +180,13 @@ Status Engine::Make(const std::shared_ptr<Configuration>& conf, bool cached,
   // original Module.
   auto module_ptr = module.get();
 
-  auto opt_level =
-      conf->optimize() ? llvm::CodeGenOpt::Aggressive : llvm::CodeGenOpt::None;
+#if LLVM_VERSION_MAJOR >= 18
+  using CodeGenOptLevel = llvm::CodeGenOptLevel;
+#else
+  using CodeGenOptLevel = llvm::CodeGenOpt::Level;
+#endif
+  auto const opt_level =
+      conf->optimize() ? CodeGenOptLevel::Aggressive : CodeGenOptLevel::None;
 
   // Note that the lifetime of the error string is not captured by the
   // ExecutionEngine but only for the lifetime of the builder. Found by