1 files changed, 14 insertions, 1 deletions
diff --git a/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp b/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
index 7f4d63eed8b..2865ea89273 100644
--- a/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
+++ b/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
@@ -205,7 +205,12 @@ enum class LLVMRustCodeModel {
   None,
 };
 
-static Optional<CodeModel::Model> fromRust(LLVMRustCodeModel Model) {
+#if LLVM_VERSION_LT(16, 0)
+static Optional<CodeModel::Model>
+#else
+static std::optional<CodeModel::Model>
+#endif
+fromRust(LLVMRustCodeModel Model) {
   switch (Model) {
   case LLVMRustCodeModel::Tiny:
     return CodeModel::Tiny;
@@ -218,7 +223,11 @@ static Optional<CodeModel::Model> fromRust(LLVMRustCodeModel Model) {
   case LLVMRustCodeModel::Large:
     return CodeModel::Large;
   case LLVMRustCodeModel::None:
+#if LLVM_VERSION_LT(16, 0)
     return None;
+#else
+    return std::nullopt;
+#endif
   default:
     report_fatal_error("Bad CodeModel.");
   }
@@ -638,7 +647,11 @@ LLVMRustOptimize(
     LLVMSelfProfileInitializeCallbacks(PIC,LlvmSelfProfiler,BeforePassCallback,AfterPassCallback);
   }
 
+#if LLVM_VERSION_LT(16, 0)
   Optional<PGOOptions> PGOOpt;
+#else
+  std::optional<PGOOptions> PGOOpt;
+#endif
   if (PGOGenPath) {
     assert(!PGOUsePath && !PGOSampleUsePath);
     PGOOpt = PGOOptions(PGOGenPath, "", "", PGOOptions::IRInstr,