2 files changed, 20 insertions, 7 deletions
diff --git a/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp b/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
index 6e607baebb5..86f1bcc46ee 100644
--- a/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
+++ b/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
@@ -484,7 +484,7 @@ extern "C" LLVMTargetMachineRef LLVMRustCreateTargetMachine(
 
   if (ArgsCstrBuff != nullptr) {
 #if LLVM_VERSION_GE(20, 0)
-    int buffer_offset = 0;
+    size_t buffer_offset = 0;
     assert(ArgsCstrBuff[ArgsCstrBuffLen - 1] == '\0');
     auto Arg0 = std::string(ArgsCstrBuff);
     buffer_offset = Arg0.size() + 1;
@@ -502,7 +502,7 @@ extern "C" LLVMTargetMachineRef LLVMRustCreateTargetMachine(
     Options.MCOptions.Argv0 = Arg0;
     Options.MCOptions.CommandlineArgs = CommandlineArgs;
 #else
-    int buffer_offset = 0;
+    size_t buffer_offset = 0;
     assert(ArgsCstrBuff[ArgsCstrBuffLen - 1] == '\0');
 
     const size_t arg0_len = std::strlen(ArgsCstrBuff);
@@ -511,13 +511,13 @@ extern "C" LLVMTargetMachineRef LLVMRustCreateTargetMachine(
     arg0[arg0_len] = '\0';
     buffer_offset += arg0_len + 1;
 
-    const int num_cmd_arg_strings = std::count(
+    const size_t num_cmd_arg_strings = std::count(
         &ArgsCstrBuff[buffer_offset], &ArgsCstrBuff[ArgsCstrBuffLen], '\0');
 
     std::string *cmd_arg_strings = new std::string[num_cmd_arg_strings];
-    for (int i = 0; i < num_cmd_arg_strings; ++i) {
+    for (size_t i = 0; i < num_cmd_arg_strings; ++i) {
       assert(buffer_offset < ArgsCstrBuffLen);
-      const int len = std::strlen(ArgsCstrBuff + buffer_offset);
+      const size_t len = std::strlen(ArgsCstrBuff + buffer_offset);
       cmd_arg_strings[i] = std::string(&ArgsCstrBuff[buffer_offset], len);
       buffer_offset += len + 1;
     }
@@ -1682,12 +1682,21 @@ extern "C" void LLVMRustComputeLTOCacheKey(RustStringRef KeyOut,
 #endif
 
   // Based on the 'InProcessThinBackend' constructor in LLVM
+#if LLVM_VERSION_GE(21, 0)
+  for (auto &Name : Data->Index.cfiFunctionDefs().symbols())
+    CfiFunctionDefs.insert(
+        GlobalValue::getGUID(GlobalValue::dropLLVMManglingEscape(Name)));
+  for (auto &Name : Data->Index.cfiFunctionDecls().symbols())
+    CfiFunctionDecls.insert(
+        GlobalValue::getGUID(GlobalValue::dropLLVMManglingEscape(Name)));
+#else
   for (auto &Name : Data->Index.cfiFunctionDefs())
     CfiFunctionDefs.insert(
         GlobalValue::getGUID(GlobalValue::dropLLVMManglingEscape(Name)));
   for (auto &Name : Data->Index.cfiFunctionDecls())
     CfiFunctionDecls.insert(
         GlobalValue::getGUID(GlobalValue::dropLLVMManglingEscape(Name)));
+#endif
 
 #if LLVM_VERSION_GE(20, 0)
   Key = llvm::computeLTOCacheKey(conf, Data->Index, ModId, ImportList,
diff --git a/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp b/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp
index aea2a8dd097..53df59930f4 100644
--- a/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp
+++ b/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp
@@ -152,8 +152,12 @@ extern "C" LLVMContextRef LLVMRustContextCreate(bool shouldDiscardNames) {
 }
 
 extern "C" void LLVMRustSetNormalizedTarget(LLVMModuleRef M,
-                                            const char *Triple) {
-  unwrap(M)->setTargetTriple(Triple::normalize(Triple));
+                                            const char *Target) {
+#if LLVM_VERSION_GE(21, 0)
+  unwrap(M)->setTargetTriple(Triple(Triple::normalize(Target)));
+#else
+  unwrap(M)->setTargetTriple(Triple::normalize(Target));
+#endif
 }
 
 extern "C" void LLVMRustPrintPassTimings(RustStringRef OutBuf) {