https://github.com/rdong8 updated 
https://github.com/llvm/llvm-project/pull/223284

>From 1fd8f3fbd7d4f0934d3861a2a4ecef3ef8410844 Mon Sep 17 00:00:00 2001
From: Richard Dong <[email protected]>
Date: Sun, 13 Sep 2026 23:18:41 +0000
Subject: [PATCH 1/8] [Support] C++26 fixes for P2591

---
 llvm/lib/Support/CodeGenCoverage.cpp   |  6 +++---
 llvm/lib/Support/VirtualFileSystem.cpp | 15 ++++++++++-----
 2 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/llvm/lib/Support/CodeGenCoverage.cpp 
b/llvm/lib/Support/CodeGenCoverage.cpp
index 2e35019e12c16..4f665ec9889ff 100644
--- a/llvm/lib/Support/CodeGenCoverage.cpp
+++ b/llvm/lib/Support/CodeGenCoverage.cpp
@@ -13,6 +13,7 @@
 
 #include "llvm/Support/Endian.h"
 #include "llvm/Support/FileSystem.h"
+#include "llvm/Support/FormatVariadic.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Mutex.h"
 #include "llvm/Support/Process.h"
@@ -83,9 +84,8 @@ bool CodeGenCoverage::emit(StringRef CoveragePrefix,
     // We can handle locking within a process easily enough but we don't want 
to
     // manage it between multiple processes. Use the process ID to ensure no
     // more than one process is ever writing to the same file at the same time.
-    std::string Pid = llvm::to_string(sys::Process::getProcessId());
-
-    std::string CoverageFilename = (CoveragePrefix + Pid).str();
+    std::string CoverageFilename =
+        formatv("{0}{1}", CoveragePrefix, sys::Process::getProcessId()).str();
 
     std::error_code EC;
     sys::fs::OpenFlags OpenFlags = sys::fs::OF_Append;
diff --git a/llvm/lib/Support/VirtualFileSystem.cpp 
b/llvm/lib/Support/VirtualFileSystem.cpp
index 04e2c3cdbcae7..4cf8c0cd9c6ea 100644
--- a/llvm/lib/Support/VirtualFileSystem.cpp
+++ b/llvm/lib/Support/VirtualFileSystem.cpp
@@ -31,6 +31,8 @@
 #include "llvm/Support/ErrorOr.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/FileSystem/UniqueID.h"
+#include "llvm/Support/FormatAdapters.h"
+#include "llvm/Support/FormatVariadic.h"
 #include "llvm/Support/IOSandbox.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Path.h"
@@ -708,7 +710,7 @@ class InMemoryFile : public InMemoryNode {
   llvm::MemoryBuffer *getBuffer() const { return Buffer.get(); }
 
   std::string toString(unsigned Indent) const override {
-    return (std::string(Indent, ' ') + Stat.getName() + "\n").str();
+    return formatv("{0}{1}\n", fmt_repeat(' ', Indent), Stat.getName()).str();
   }
 
   static bool classof(const InMemoryNode *N) {
@@ -731,8 +733,9 @@ class InMemoryHardLink : public InMemoryNode {
   }
 
   std::string toString(unsigned Indent) const override {
-    return std::string(Indent, ' ') + "HardLink to -> " +
-           ResolvedFile.toString(0);
+    return formatv("{0}HardLink to -> {1}", fmt_repeat(' ', Indent),
+                   ResolvedFile.toString(0))
+        .str();
   }
 
   static bool classof(const InMemoryNode *N) {
@@ -750,7 +753,9 @@ class InMemorySymbolicLink : public InMemoryNode {
         Stat(Stat) {}
 
   std::string toString(unsigned Indent) const override {
-    return std::string(Indent, ' ') + "SymbolicLink to -> " + TargetPath;
+    return formatv("{0}SymbolicLink to -> {1}", fmt_repeat(' ', Indent),
+                   TargetPath)
+        .str();
   }
 
   Status getStatus(const Twine &RequestedName) const override {
@@ -830,7 +835,7 @@ class InMemoryDirectory : public InMemoryNode {
 
   std::string toString(unsigned Indent) const override {
     std::string Result =
-        (std::string(Indent, ' ') + Stat.getName() + "\n").str();
+        formatv("{0}{1}\n", fmt_repeat(' ', Indent), Stat.getName()).str();
     for (const auto &Entry : Entries)
       Result += Entry.second->toString(Indent + 2);
     return Result;

>From ad79019bd42b2a0cc6eb91c3165997621ce2feee Mon Sep 17 00:00:00 2001
From: Richard Dong <[email protected]>
Date: Mon, 14 Sep 2026 06:28:46 +0000
Subject: [PATCH 2/8] [FileCheck] C++26 fixes for P2591

---
 llvm/lib/FileCheck/FileCheck.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/llvm/lib/FileCheck/FileCheck.cpp b/llvm/lib/FileCheck/FileCheck.cpp
index 9889f5d68a52f..68377b631380e 100644
--- a/llvm/lib/FileCheck/FileCheck.cpp
+++ b/llvm/lib/FileCheck/FileCheck.cpp
@@ -1850,7 +1850,8 @@ bool FileCheck::readCheckFile(
     std::string Prefix = "-implicit-check-not='";
     std::string Suffix = "'";
     std::unique_ptr<MemoryBuffer> CmdLine = MemoryBuffer::getMemBufferCopy(
-        (Prefix + PatternString + Suffix).str(), "command line");
+        formatv("{0}{1}{2}", Prefix, PatternString, Suffix).str(),
+        "command line");
 
     StringRef PatternInBuffer =
         CmdLine->getBuffer().substr(Prefix.size(), PatternString.size());
@@ -2596,7 +2597,8 @@ Error FileCheckPatternContext::defineCmdlineVariables(
       // Append a copy of the command-line definition adapted to use the same
       // format as in the input file to be able to reuse
       // parseNumericSubstitutionBlock.
-      CmdlineDefsDiag += (DefPrefix + CmdlineDef + " (parsed as: [[").str();
+      CmdlineDefsDiag +=
+          formatv("{0}{1} (parsed as: [[", DefPrefix, CmdlineDef).str();
       std::string SubstitutionStr = std::string(CmdlineDef);
       SubstitutionStr[EqIdx] = ':';
       CmdlineDefsIndices.push_back(

>From 5a08a9564de7c20bfbb9be96789cae7b1e20d709 Mon Sep 17 00:00:00 2001
From: Richard Dong <[email protected]>
Date: Sun, 20 Sep 2026 02:02:35 +0000
Subject: [PATCH 3/8] [Support][FileCheck][IR] cast concat operands to Twine

---
 llvm/lib/FileCheck/FileCheck.cpp       |  9 ++++-----
 llvm/lib/IR/AutoUpgrade.cpp            |  2 +-
 llvm/lib/Support/CodeGenCoverage.cpp   |  3 +--
 llvm/lib/Support/VirtualFileSystem.cpp | 15 +++++----------
 4 files changed, 11 insertions(+), 18 deletions(-)

diff --git a/llvm/lib/FileCheck/FileCheck.cpp b/llvm/lib/FileCheck/FileCheck.cpp
index 68377b631380e..677331bda2f61 100644
--- a/llvm/lib/FileCheck/FileCheck.cpp
+++ b/llvm/lib/FileCheck/FileCheck.cpp
@@ -1847,11 +1847,10 @@ bool FileCheck::readCheckFile(
   for (StringRef PatternString : Req.ImplicitCheckNot) {
     // Create a buffer with fake command line content in order to display the
     // command line option responsible for the specific implicit CHECK-NOT.
-    std::string Prefix = "-implicit-check-not='";
-    std::string Suffix = "'";
+    StringRef Prefix = "-implicit-check-not='";
+    StringRef Suffix = "'";
     std::unique_ptr<MemoryBuffer> CmdLine = MemoryBuffer::getMemBufferCopy(
-        formatv("{0}{1}{2}", Prefix, PatternString, Suffix).str(),
-        "command line");
+        (Prefix + PatternString + Suffix).str(), "command line");
 
     StringRef PatternInBuffer =
         CmdLine->getBuffer().substr(Prefix.size(), PatternString.size());
@@ -2598,7 +2597,7 @@ Error FileCheckPatternContext::defineCmdlineVariables(
       // format as in the input file to be able to reuse
       // parseNumericSubstitutionBlock.
       CmdlineDefsDiag +=
-          formatv("{0}{1} (parsed as: [[", DefPrefix, CmdlineDef).str();
+          (Twine(DefPrefix) + CmdlineDef + " (parsed as: [[").str();
       std::string SubstitutionStr = std::string(CmdlineDef);
       SubstitutionStr[EqIdx] = ':';
       CmdlineDefsIndices.push_back(
diff --git a/llvm/lib/IR/AutoUpgrade.cpp b/llvm/lib/IR/AutoUpgrade.cpp
index 75fc03c22222b..a91fbef8b0f8a 100644
--- a/llvm/lib/IR/AutoUpgrade.cpp
+++ b/llvm/lib/IR/AutoUpgrade.cpp
@@ -7873,7 +7873,7 @@ std::string llvm::UpgradeDataLayoutString(StringRef DL, 
StringRef TT) {
   // to fix more IR than it breaks.
   // Intel MCU is an exception and uses 4-byte-alignment.
   if (!T.isOSIAMCU()) {
-    std::string I128 = "-i128:128";
+    StringRef I128 = "-i128:128";
     if (StringRef Ref = Res; !Ref.contains(I128)) {
       SmallVector<StringRef, 4> Groups;
       Regex R("^(e(-[mpi][^-]*)*)((-[^mpi][^-]*)*)$");
diff --git a/llvm/lib/Support/CodeGenCoverage.cpp 
b/llvm/lib/Support/CodeGenCoverage.cpp
index 4f665ec9889ff..e1b04bbc64e16 100644
--- a/llvm/lib/Support/CodeGenCoverage.cpp
+++ b/llvm/lib/Support/CodeGenCoverage.cpp
@@ -13,7 +13,6 @@
 
 #include "llvm/Support/Endian.h"
 #include "llvm/Support/FileSystem.h"
-#include "llvm/Support/FormatVariadic.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Mutex.h"
 #include "llvm/Support/Process.h"
@@ -85,7 +84,7 @@ bool CodeGenCoverage::emit(StringRef CoveragePrefix,
     // manage it between multiple processes. Use the process ID to ensure no
     // more than one process is ever writing to the same file at the same time.
     std::string CoverageFilename =
-        formatv("{0}{1}", CoveragePrefix, sys::Process::getProcessId()).str();
+        (CoveragePrefix + Twine(sys::Process::getProcessId())).str();
 
     std::error_code EC;
     sys::fs::OpenFlags OpenFlags = sys::fs::OF_Append;
diff --git a/llvm/lib/Support/VirtualFileSystem.cpp 
b/llvm/lib/Support/VirtualFileSystem.cpp
index 4e4592310b553..38c77ab8fd817 100644
--- a/llvm/lib/Support/VirtualFileSystem.cpp
+++ b/llvm/lib/Support/VirtualFileSystem.cpp
@@ -31,8 +31,6 @@
 #include "llvm/Support/ErrorOr.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/FileSystem/UniqueID.h"
-#include "llvm/Support/FormatAdapters.h"
-#include "llvm/Support/FormatVariadic.h"
 #include "llvm/Support/IOSandbox.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Path.h"
@@ -710,7 +708,7 @@ class InMemoryFile : public InMemoryNode {
   llvm::MemoryBuffer *getBuffer() const { return Buffer.get(); }
 
   std::string toString(unsigned Indent) const override {
-    return formatv("{0}{1}\n", fmt_repeat(' ', Indent), Stat.getName()).str();
+    return (Twine(std::string(Indent, ' ')) + Stat.getName() + "\n").str();
   }
 
   static bool classof(const InMemoryNode *N) {
@@ -733,9 +731,8 @@ class InMemoryHardLink : public InMemoryNode {
   }
 
   std::string toString(unsigned Indent) const override {
-    return formatv("{0}HardLink to -> {1}", fmt_repeat(' ', Indent),
-                   ResolvedFile.toString(0))
-        .str();
+    return std::string(Indent, ' ') + "HardLink to -> " +
+           ResolvedFile.toString(0);
   }
 
   static bool classof(const InMemoryNode *N) {
@@ -753,9 +750,7 @@ class InMemorySymbolicLink : public InMemoryNode {
         Stat(Stat) {}
 
   std::string toString(unsigned Indent) const override {
-    return formatv("{0}SymbolicLink to -> {1}", fmt_repeat(' ', Indent),
-                   TargetPath)
-        .str();
+    return std::string(Indent, ' ') + "SymbolicLink to -> " + TargetPath;
   }
 
   Status getStatus(const Twine &RequestedName) const override {
@@ -835,7 +830,7 @@ class InMemoryDirectory : public InMemoryNode {
 
   std::string toString(unsigned Indent) const override {
     std::string Result =
-        formatv("{0}{1}\n", fmt_repeat(' ', Indent), Stat.getName()).str();
+        (Twine(std::string(Indent, ' ')) + Stat.getName() + "\n").str();
     for (const auto &Entry : Entries)
       Result += Entry.second->toString(Indent + 2);
     return Result;

>From adcc1377b0c58e36e58b6636dcc9015e1410edf3 Mon Sep 17 00:00:00 2001
From: Richard Dong <[email protected]>
Date: Sun, 20 Sep 2026 03:24:55 +0000
Subject: [PATCH 4/8] [MLIR] C++26 fixes for P2591

---
 .../Target/LLVMIR/Dialect/OpenMP/OpenMPToLLVMIRTranslation.cpp | 2 +-
 mlir/tools/mlir-tblgen/OpPythonBindingGen.cpp                  | 3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git 
a/mlir/lib/Target/LLVMIR/Dialect/OpenMP/OpenMPToLLVMIRTranslation.cpp 
b/mlir/lib/Target/LLVMIR/Dialect/OpenMP/OpenMPToLLVMIRTranslation.cpp
index e5e3e0cc6d944..5a0411b68d20d 100644
--- a/mlir/lib/Target/LLVMIR/Dialect/OpenMP/OpenMPToLLVMIRTranslation.cpp
+++ b/mlir/lib/Target/LLVMIR/Dialect/OpenMP/OpenMPToLLVMIRTranslation.cpp
@@ -7056,7 +7056,7 @@ getRefPtrIfDeclareTarget(Value value,
             gOp.getSymName());
 
       return moduleTranslation.getLLVMModule()->getNamedValue(
-          (gOp.getSymName().str() + suffix.str()).str());
+          (gOp.getSymName() + suffix).str());
     }
   }
   return nullptr;
diff --git a/mlir/tools/mlir-tblgen/OpPythonBindingGen.cpp 
b/mlir/tools/mlir-tblgen/OpPythonBindingGen.cpp
index 81c598ebbef0a..6f771130b23be 100644
--- a/mlir/tools/mlir-tblgen/OpPythonBindingGen.cpp
+++ b/mlir/tools/mlir-tblgen/OpPythonBindingGen.cpp
@@ -1162,7 +1162,8 @@ static void populateBuilderRegions(const Operator &op,
 
   const NamedRegion &region = op.getRegion(op.getNumRegions() - 1);
   std::string name =
-      ("num_" + region.name.take_front().lower() + region.name.drop_front())
+      (Twine("num_") + region.name.take_front().lower() +
+       region.name.drop_front())
           .str();
   builderArgs.push_back(name);
   builderLines.push_back(

>From 447d82459d4544a1b9af48f0d3c01169f3292f47 Mon Sep 17 00:00:00 2001
From: Richard Dong <[email protected]>
Date: Sun, 20 Sep 2026 04:40:21 +0000
Subject: [PATCH 5/8] [llvm] C++26 fixes

---
 llvm/include/llvm/Analysis/ReleaseModeModelRunner.h       | 3 ++-
 llvm/include/llvm/Frontend/OpenMP/OMPIRBuilder.h          | 4 +---
 llvm/lib/Analysis/CFGPrinter.cpp                          | 2 +-
 llvm/lib/Analysis/ReplayInlineAdvisor.cpp                 | 3 ++-
 llvm/lib/CodeGen/MachineCFGPrinter.cpp                    | 3 ++-
 llvm/lib/Frontend/OpenMP/OMP.cpp                          | 3 ++-
 llvm/lib/Frontend/OpenMP/OMPIRBuilder.cpp                 | 8 ++++++--
 llvm/lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.cpp      | 4 +++-
 .../LoongArch/MCTargetDesc/LoongArchELFStreamer.cpp       | 6 ++++++
 .../Target/LoongArch/MCTargetDesc/LoongArchELFStreamer.h  | 3 +--
 llvm/lib/Target/M68k/MCTargetDesc/M68kMCTargetDesc.cpp    | 3 ++-
 llvm/lib/Target/SPIRV/SPIRVBuiltins.cpp                   | 5 +++--
 llvm/lib/Target/WebAssembly/WebAssemblyAsmPrinter.cpp     | 3 ++-
 .../Instrumentation/SanitizerBinaryMetadata.cpp           | 3 ++-
 14 files changed, 35 insertions(+), 18 deletions(-)

diff --git a/llvm/include/llvm/Analysis/ReleaseModeModelRunner.h 
b/llvm/include/llvm/Analysis/ReleaseModeModelRunner.h
index ff423a9155b14..3ca3205406946 100644
--- a/llvm/include/llvm/Analysis/ReleaseModeModelRunner.h
+++ b/llvm/include/llvm/Analysis/ReleaseModeModelRunner.h
@@ -15,6 +15,7 @@
 #define LLVM_ANALYSIS_RELEASEMODEMODELRUNNER_H
 
 #include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/Twine.h"
 #include "llvm/Analysis/MLModelRunner.h"
 #include "llvm/Analysis/TensorSpec.h"
 #include "llvm/Support/ErrorHandling.h"
@@ -119,7 +120,7 @@ class ReleaseModeModelRunner final : public MLModelRunner {
   void populateTensor(size_t Pos, const TensorSpec &Spec, StringRef Prefix,
                       bool &InputIsPresent) {
     const int Index =
-        CompiledModel->LookupArgIndex((Prefix + Spec.name()).str());
+        CompiledModel->LookupArgIndex((Twine(Prefix) + Spec.name()).str());
     void *Buffer = nullptr;
     InputIsPresent = Index >= 0;
     if (InputIsPresent)
diff --git a/llvm/include/llvm/Frontend/OpenMP/OMPIRBuilder.h 
b/llvm/include/llvm/Frontend/OpenMP/OMPIRBuilder.h
index 30eb42a2f5c38..391740de4861b 100644
--- a/llvm/include/llvm/Frontend/OpenMP/OMPIRBuilder.h
+++ b/llvm/include/llvm/Frontend/OpenMP/OMPIRBuilder.h
@@ -512,9 +512,7 @@ class OpenMPIRBuilder {
 public:
   /// Create a new OpenMPIRBuilder operating on the given module \p M. This 
will
   /// not have an effect on \p M (see initialize)
-  OpenMPIRBuilder(Module &M)
-      : M(M), Builder(M.getContext()), OffloadInfoManager(this),
-        T(M.getTargetTriple()), IsFinalized(false) {}
+  LLVM_ABI OpenMPIRBuilder(Module &M);
   LLVM_ABI ~OpenMPIRBuilder();
 
   class AtomicInfo : public llvm::AtomicInfo {
diff --git a/llvm/lib/Analysis/CFGPrinter.cpp b/llvm/lib/Analysis/CFGPrinter.cpp
index 39108a906f081..25f3f95e47485 100644
--- a/llvm/lib/Analysis/CFGPrinter.cpp
+++ b/llvm/lib/Analysis/CFGPrinter.cpp
@@ -62,7 +62,7 @@ static void writeCFGToDotFile(Function &F, BlockFrequencyInfo 
*BFI,
                               BranchProbabilityInfo *BPI, uint64_t MaxFreq,
                               bool CFGOnly = false) {
   std::string Filename =
-      (CFGDotFilenamePrefix + "." + F.getName() + ".dot").str();
+      (Twine(CFGDotFilenamePrefix) + "." + F.getName() + ".dot").str();
   errs() << "Writing '" << Filename << "'...";
 
   std::error_code EC;
diff --git a/llvm/lib/Analysis/ReplayInlineAdvisor.cpp 
b/llvm/lib/Analysis/ReplayInlineAdvisor.cpp
index 7253478a0eedf..1b4f159105342 100644
--- a/llvm/lib/Analysis/ReplayInlineAdvisor.cpp
+++ b/llvm/lib/Analysis/ReplayInlineAdvisor.cpp
@@ -14,6 +14,7 @@
 
//===----------------------------------------------------------------------===//
 
 #include "llvm/Analysis/ReplayInlineAdvisor.h"
+#include "llvm/ADT/Twine.h"
 #include "llvm/Analysis/OptimizationRemarkEmitter.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/LineIterator.h"
@@ -107,7 +108,7 @@ std::unique_ptr<InlineAdvice> 
ReplayInlineAdvisor::getAdviceImpl(CallBase &CB) {
   std::string CallSiteLoc =
       formatCallSiteLocation(CB.getDebugLoc(), ReplaySettings.ReplayFormat);
   StringRef Callee = CB.getCalledFunction()->getName();
-  std::string Combined = (Callee + CallSiteLoc).str();
+  std::string Combined = (Twine(Callee) + CallSiteLoc).str();
 
   // Replay decision, if it has one
   auto Iter = InlineSitesFromRemarks.find(Combined);
diff --git a/llvm/lib/CodeGen/MachineCFGPrinter.cpp 
b/llvm/lib/CodeGen/MachineCFGPrinter.cpp
index c604d4fd6e1e6..dec83d49b99cb 100644
--- a/llvm/lib/CodeGen/MachineCFGPrinter.cpp
+++ b/llvm/lib/CodeGen/MachineCFGPrinter.cpp
@@ -17,6 +17,7 @@
 #include "llvm/CodeGen/TargetSubtargetInfo.h"
 #include "llvm/InitializePasses.h"
 #include "llvm/Pass.h"
+#include "llvm/ADT/Twine.h"
 #include "llvm/Support/GraphWriter.h"
 
 using namespace llvm;
@@ -38,7 +39,7 @@ static cl::opt<bool>
 
 static void writeMCFGToDotFile(MachineFunction &MF) {
   std::string Filename =
-      (MCFGDotFilenamePrefix + "." + MF.getName() + ".dot").str();
+      (Twine(MCFGDotFilenamePrefix) + "." + MF.getName() + ".dot").str();
   errs() << "Writing '" << Filename << "'...";
 
   std::error_code EC;
diff --git a/llvm/lib/Frontend/OpenMP/OMP.cpp b/llvm/lib/Frontend/OpenMP/OMP.cpp
index 8bfe3a6a7cc4a..ff584568d3cd9 100644
--- a/llvm/lib/Frontend/OpenMP/OMP.cpp
+++ b/llvm/lib/Frontend/OpenMP/OMP.cpp
@@ -12,6 +12,7 @@
 #include "llvm/ADT/SmallSet.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/Twine.h"
 #include "llvm/Demangle/Demangle.h"
 #include "llvm/Frontend/OpenMP/OMPIRBuilder.h"
 #include "llvm/Support/ErrorHandling.h"
@@ -241,7 +242,7 @@ std::string prettifyFunctionName(StringRef FunctionName) {
   auto ParentName = deconstructOpenMPKernelName(FunctionName, LineNo);
   if (LineNo == 0)
     return FunctionName.str();
-  return ("omp target in " + ParentName + " @ " + std::to_string(LineNo) +
+  return (Twine("omp target in ") + ParentName + " @ " + Twine(LineNo) +
           " (" + FunctionName + ")")
       .str();
 }
diff --git a/llvm/lib/Frontend/OpenMP/OMPIRBuilder.cpp 
b/llvm/lib/Frontend/OpenMP/OMPIRBuilder.cpp
index 8b196c461f195..57d313f7b0abf 100644
--- a/llvm/lib/Frontend/OpenMP/OMPIRBuilder.cpp
+++ b/llvm/lib/Frontend/OpenMP/OMPIRBuilder.cpp
@@ -1180,6 +1180,10 @@ void 
OpenMPIRBuilder::applyDeclareTargetGlobalReplacements() {
   DeclareTargetGlobalReplacements.clear();
 }
 
+OpenMPIRBuilder::OpenMPIRBuilder(Module &M)
+    : M(M), Builder(M.getContext()), OffloadInfoManager(this),
+      T(M.getTargetTriple()), IsFinalized(false) {}
+
 OpenMPIRBuilder::~OpenMPIRBuilder() {
   assert(OutlineInfos.empty() && "There must be no outstanding outlinings");
 }
@@ -4655,7 +4659,7 @@ Expected<Function *> 
OpenMPIRBuilder::emitGlobalToListReduceFunction(
 std::string OpenMPIRBuilder::getReductionFuncName(StringRef Name) const {
   std::string Suffix =
       createPlatformSpecificName({"omp", "reduction", "reduction_func"});
-  return (Name + Suffix).str();
+  return (Twine(Name) + Suffix).str();
 }
 
 Expected<Function *> OpenMPIRBuilder::createReductionFunction(
@@ -13420,4 +13424,4 @@ void CanonicalLoopInfo::invalidate() {
   Cond = nullptr;
   Latch = nullptr;
   Exit = nullptr;
-}
+}
\ No newline at end of file
diff --git a/llvm/lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.cpp 
b/llvm/lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.cpp
index 467fdbfd0e05b..e30c2a262eede 100644
--- a/llvm/lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.cpp
+++ b/llvm/lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.cpp
@@ -16,6 +16,7 @@
 #include "ARMInstPrinter.h"
 #include "ARMMCAsmInfo.h"
 #include "TargetInfo/ARMTargetInfo.h"
+#include "llvm/ADT/Twine.h"
 #include "llvm/DebugInfo/CodeView/CodeView.h"
 #include "llvm/MC/MCAsmBackend.h"
 #include "llvm/MC/MCCodeEmitter.h"
@@ -144,7 +145,8 @@ std::string ARM_MC::ParseARMTriple(const Triple &TT, 
StringRef CPU) {
 
   ARM::ArchKind ArchID = ARM::parseArch(TT.getArchName());
   if (ArchID != ARM::ArchKind::INVALID &&  (CPU.empty() || CPU == "generic"))
-    ARMArchFeature = (ARMArchFeature + "+" + ARM::getArchName(ArchID)).str();
+    ARMArchFeature =
+        (Twine(ARMArchFeature) + "+" + ARM::getArchName(ArchID)).str();
 
   if (TT.isThumb()) {
     if (!ARMArchFeature.empty())
diff --git a/llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchELFStreamer.cpp 
b/llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchELFStreamer.cpp
index 91433d8eaddc5..7dc31e4b8cc17 100644
--- a/llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchELFStreamer.cpp
+++ b/llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchELFStreamer.cpp
@@ -89,6 +89,12 @@ void LoongArchTargetELFStreamer::finish() {
   W.setELFHeaderEFlags(EFlags);
 }
 
+LoongArchELFStreamer::LoongArchELFStreamer(MCContext &C,
+                                           std::unique_ptr<MCAsmBackend> MAB,
+                                           std::unique_ptr<MCObjectWriter> MOW,
+                                           std::unique_ptr<MCCodeEmitter> MCE)
+    : MCELFStreamer(C, std::move(MAB), std::move(MOW), std::move(MCE)) {}
+
 void LoongArchELFStreamer::emitCodeAlignment(Align Alignment,
                                              const MCSubtargetInfo &STI,
                                              unsigned MaxBytesToEmit) {
diff --git a/llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchELFStreamer.h 
b/llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchELFStreamer.h
index a9e5ec2bb527c..46c359000134d 100644
--- a/llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchELFStreamer.h
+++ b/llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchELFStreamer.h
@@ -33,8 +33,7 @@ class LoongArchELFStreamer : public MCELFStreamer {
 public:
   LoongArchELFStreamer(MCContext &C, std::unique_ptr<MCAsmBackend> MAB,
                        std::unique_ptr<MCObjectWriter> MOW,
-                       std::unique_ptr<MCCodeEmitter> MCE)
-      : MCELFStreamer(C, std::move(MAB), std::move(MOW), std::move(MCE)) {}
+                       std::unique_ptr<MCCodeEmitter> MCE);
 
   void emitCodeAlignment(Align Alignment, const MCSubtargetInfo &STI,
                          unsigned MaxBytesToEmit) override;
diff --git a/llvm/lib/Target/M68k/MCTargetDesc/M68kMCTargetDesc.cpp 
b/llvm/lib/Target/M68k/MCTargetDesc/M68kMCTargetDesc.cpp
index 9d2904dec0ad0..0599796dc79dc 100644
--- a/llvm/lib/Target/M68k/MCTargetDesc/M68kMCTargetDesc.cpp
+++ b/llvm/lib/Target/M68k/MCTargetDesc/M68kMCTargetDesc.cpp
@@ -16,6 +16,7 @@
 #include "M68kMCAsmInfo.h"
 #include "TargetInfo/M68kTargetInfo.h"
 
+#include "llvm/ADT/Twine.h"
 #include "llvm/MC/MCELFStreamer.h"
 #include "llvm/MC/MCInstPrinter.h"
 #include "llvm/MC/MCInstrInfo.h"
@@ -62,7 +63,7 @@ static MCSubtargetInfo *createM68kMCSubtargetInfo(const 
Triple &TT,
   std::string ArchFS = ParseM68kTriple(TT, CPU);
   if (!FS.empty()) {
     if (!ArchFS.empty()) {
-      ArchFS = (ArchFS + "," + FS).str();
+      ArchFS = (Twine(ArchFS) + "," + FS).str();
     } else {
       ArchFS = FS.str();
     }
diff --git a/llvm/lib/Target/SPIRV/SPIRVBuiltins.cpp 
b/llvm/lib/Target/SPIRV/SPIRVBuiltins.cpp
index 20cf9275af8df..4c8bb7feb408b 100644
--- a/llvm/lib/Target/SPIRV/SPIRVBuiltins.cpp
+++ b/llvm/lib/Target/SPIRV/SPIRVBuiltins.cpp
@@ -17,6 +17,7 @@
 #include "SPIRVUtils.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/ADT/StringTable.h"
+#include "llvm/ADT/Twine.h"
 #include "llvm/Analysis/ValueTracking.h"
 #include "llvm/IR/IntrinsicsSPIRV.h"
 #include <regex>
@@ -339,12 +340,12 @@ lookupBuiltin(StringRef DemangledCall,
 
     // If argument-type name prefix was added, look up the builtin again.
     if (!Prefix.empty() &&
-        (Builtin = SPIRV::lookupBuiltin((Prefix + BuiltinName).str(), Set)))
+        (Builtin = SPIRV::lookupBuiltin((Twine(Prefix) + BuiltinName).str(), 
Set)))
       return std::make_unique<SPIRV::IncomingCall>(
           BuiltinName, Builtin, ReturnRegister, ReturnType, Arguments);
 
     if (!Suffix.empty() &&
-        (Builtin = SPIRV::lookupBuiltin((BuiltinName + Suffix).str(), Set)))
+        (Builtin = SPIRV::lookupBuiltin((Twine(BuiltinName) + Suffix).str(), 
Set)))
       return std::make_unique<SPIRV::IncomingCall>(
           BuiltinName, Builtin, ReturnRegister, ReturnType, Arguments);
   }
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyAsmPrinter.cpp 
b/llvm/lib/Target/WebAssembly/WebAssemblyAsmPrinter.cpp
index 6bb03c614af19..35d4e8dc4e177 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyAsmPrinter.cpp
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyAsmPrinter.cpp
@@ -29,6 +29,7 @@
 #include "llvm/ADT/MapVector.h"
 #include "llvm/ADT/SmallSet.h"
 #include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/Twine.h"
 #include "llvm/Analysis/ValueTracking.h"
 #include "llvm/BinaryFormat/Wasm.h"
 #include "llvm/CodeGen/Analysis.h"
@@ -588,7 +589,7 @@ void WebAssemblyAsmPrinter::EmitTargetFeatures(Module &M) {
   // Read target features and linkage policies from module metadata
   SmallVector<FeatureEntry, 4> EmittedFeatures;
   auto EmitFeature = [&](std::string Feature) {
-    std::string MDKey = (StringRef("wasm-feature-") + Feature).str();
+    std::string MDKey = (Twine("wasm-feature-") + Feature).str();
     Metadata *Policy = M.getModuleFlag(MDKey);
     if (Policy == nullptr)
       return;
diff --git a/llvm/lib/Transforms/Instrumentation/SanitizerBinaryMetadata.cpp 
b/llvm/lib/Transforms/Instrumentation/SanitizerBinaryMetadata.cpp
index 210b1266de23c..c45c804ad6cca 100644
--- a/llvm/lib/Transforms/Instrumentation/SanitizerBinaryMetadata.cpp
+++ b/llvm/lib/Transforms/Instrumentation/SanitizerBinaryMetadata.cpp
@@ -213,7 +213,8 @@ bool SanitizerBinaryMetadata::run() {
     // Calls to the initialization functions with different versions cannot be
     // merged. Give the structors unique names based on the version, which will
     // also be used as the COMDAT key.
-    const std::string StructorPrefix = (MI->FunctionPrefix + VersionStr).str();
+    const std::string StructorPrefix =
+        (Twine(MI->FunctionPrefix) + VersionStr).str();
 
     // We declare the _add and _del functions as weak, and only call them if
     // there is a valid symbol linked. This allows building binaries with

>From 12379fdbc351ec8cad5126e95c2e88da740e5ebd Mon Sep 17 00:00:00 2001
From: Richard Dong <[email protected]>
Date: Sun, 20 Sep 2026 18:18:32 +0000
Subject: [PATCH 6/8] [MC] Fix ELF symbol info computation

---
 llvm/lib/MC/ELFObjectWriter.cpp | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/llvm/lib/MC/ELFObjectWriter.cpp b/llvm/lib/MC/ELFObjectWriter.cpp
index 3af4851d39d94..d57b1abf6f5c1 100644
--- a/llvm/lib/MC/ELFObjectWriter.cpp
+++ b/llvm/lib/MC/ELFObjectWriter.cpp
@@ -406,6 +406,10 @@ static bool isIFunc(const MCSymbolELF *Symbol) {
   return true;
 }
 
+static uint8_t getSymbolInfo(uint8_t Binding, uint8_t Type) {
+  return (Binding << 4) | (Type & 0x0f);
+}
+
 void ELFWriter::writeSymbol(SymbolTableWriter &Writer, uint32_t StringIndex,
                             ELFSymbolData &MSD) {
   auto &Symbol = static_cast<const MCSymbolELF &>(*MSD.Symbol);
@@ -423,7 +427,7 @@ void ELFWriter::writeSymbol(SymbolTableWriter &Writer, 
uint32_t StringIndex,
   if (Base) {
     Type = mergeTypeForSet(Type, Base->getType());
   }
-  uint8_t Info = (Binding << 4) | Type;
+  uint8_t Info = getSymbolInfo(Binding, Type);
 
   // Other and Visibility share the same byte with Visibility using the lower
   // 2 bits
@@ -610,8 +614,8 @@ void ELFWriter::computeSymbolTable(const RevGroupMapTy 
&RevGroupMap) {
     for (; FileNameIt != FileNames.end() && FileNameIt->second <= MSD.Order;
          ++FileNameIt) {
       Writer.writeSymbol(StrTabBuilder.getOffset(FileNameIt->first),
-                         ELF::STT_FILE | ELF::STB_LOCAL, 0, 0, 
ELF::STV_DEFAULT,
-                         ELF::SHN_ABS, true);
+                         getSymbolInfo(ELF::STB_LOCAL, ELF::STT_FILE), 0, 0,
+                         ELF::STV_DEFAULT, ELF::SHN_ABS, true);
       ++Index;
     }
 
@@ -623,8 +627,8 @@ void ELFWriter::computeSymbolTable(const RevGroupMapTy 
&RevGroupMap) {
   }
   for (; FileNameIt != FileNames.end(); ++FileNameIt) {
     Writer.writeSymbol(StrTabBuilder.getOffset(FileNameIt->first),
-                       ELF::STT_FILE | ELF::STB_LOCAL, 0, 0, ELF::STV_DEFAULT,
-                       ELF::SHN_ABS, true);
+                       getSymbolInfo(ELF::STB_LOCAL, ELF::STT_FILE), 0, 0,
+                       ELF::STV_DEFAULT, ELF::SHN_ABS, true);
     ++Index;
   }
 

>From 54e424f6259b592bd281dc9e802418e02b6c41a0 Mon Sep 17 00:00:00 2001
From: Richard Dong <[email protected]>
Date: Mon, 21 Sep 2026 07:21:26 +0000
Subject: [PATCH 7/8] [Clang] C++26 fixes

---
 clang/include/clang/Frontend/FrontendAction.h     |  3 ++-
 clang/include/clang/Sema/CodeCompleteConsumer.h   | 13 +++++++++++--
 clang/lib/Basic/DiagnosticIDs.cpp                 |  4 ++--
 clang/lib/Basic/Targets/AArch64.cpp               | 15 ++++++++-------
 clang/lib/Basic/Targets/AMDGPU.cpp                |  2 +-
 clang/lib/Basic/Targets/ARM.cpp                   | 12 ++++++------
 clang/lib/Basic/Targets/AVR.cpp                   |  3 ++-
 clang/lib/Basic/Targets/BPF.cpp                   |  2 +-
 clang/lib/Basic/Targets/DirectX.cpp               |  2 +-
 clang/lib/Basic/Targets/Hexagon.cpp               |  2 +-
 clang/lib/Basic/Targets/LoongArch.cpp             |  8 ++++----
 clang/lib/Basic/Targets/Mips.cpp                  |  2 +-
 clang/lib/Basic/Targets/NVPTX.cpp                 |  2 +-
 clang/lib/Basic/Targets/PPC.cpp                   |  2 +-
 clang/lib/Basic/Targets/RISCV.cpp                 | 10 +++++-----
 clang/lib/Basic/Targets/SPIR.cpp                  |  2 +-
 clang/lib/Basic/Targets/SystemZ.cpp               |  4 ++--
 clang/lib/Basic/Targets/VE.cpp                    |  2 +-
 clang/lib/Basic/Targets/WebAssembly.cpp           |  2 +-
 clang/lib/Basic/Targets/X86.cpp                   |  6 +++---
 clang/lib/Basic/Targets/XCore.cpp                 |  2 +-
 clang/lib/CodeGen/CGDecl.cpp                      |  2 +-
 clang/lib/CodeGen/CGExpr.cpp                      |  2 +-
 clang/lib/CodeGen/CGExprAgg.cpp                   |  2 +-
 clang/lib/CodeGen/CGObjCGNU.cpp                   | 12 ++++++------
 clang/lib/CodeGen/CGOpenMPRuntime.cpp             |  4 ++--
 clang/lib/Driver/Driver.cpp                       |  4 ++--
 clang/lib/Driver/ToolChains/Gnu.cpp               |  9 +++++----
 clang/lib/Driver/ToolChains/MinGW.cpp             | 11 +++++++----
 clang/lib/Frontend/FrontendAction.cpp             |  4 ++++
 .../Checkers/ExprInspectionChecker.cpp            | 10 +++++-----
 clang/lib/StaticAnalyzer/Core/TextDiagnostics.cpp |  2 +-
 clang/lib/Tooling/Core/Replacement.cpp            |  2 +-
 clang/lib/Tooling/Tooling.cpp                     |  2 +-
 clang/utils/TableGen/ClangBuiltinsEmitter.cpp     |  3 ++-
 35 files changed, 95 insertions(+), 74 deletions(-)

diff --git a/clang/include/clang/Frontend/FrontendAction.h 
b/clang/include/clang/Frontend/FrontendAction.h
index 8be732ceb40a0..19718f5a2582d 100644
--- a/clang/include/clang/Frontend/FrontendAction.h
+++ b/clang/include/clang/Frontend/FrontendAction.h
@@ -161,8 +161,9 @@ class FrontendAction {
 
   std::unique_ptr<ASTUnit> takeCurrentASTUnit();
 
+  void setCurrentInput(const FrontendInputFile &CurrentInput);
   void setCurrentInput(const FrontendInputFile &CurrentInput,
-                       std::unique_ptr<ASTUnit> AST = nullptr);
+                       std::unique_ptr<ASTUnit> AST);
 
   /// @}
   /// @name Supported Modes
diff --git a/clang/include/clang/Sema/CodeCompleteConsumer.h 
b/clang/include/clang/Sema/CodeCompleteConsumer.h
index c26f4e33d289c..e5772f80d5f40 100644
--- a/clang/include/clang/Sema/CodeCompleteConsumer.h
+++ b/clang/include/clang/Sema/CodeCompleteConsumer.h
@@ -50,7 +50,7 @@ class UsingShadowDecl;
 
 /// Default priority values for code-completion results based
 /// on their kind.
-enum {
+enum CodeCompletionPriority {
   /// Priority for the next initialization in a constructor initializer
   /// list.
   CCP_NextInitializer = 7,
@@ -101,7 +101,7 @@ enum {
 
 /// Priority value deltas that are added to code-completion results
 /// based on the context of the result.
-enum {
+enum CodeCompletionDelta {
   /// The result is in a base class.
   CCD_InBaseClass = 2,
 
@@ -130,6 +130,15 @@ enum {
   CCD_BlockPropertySetter = 3
 };
 
+constexpr unsigned operator+(CodeCompletionPriority P, CodeCompletionDelta D) {
+  return static_cast<unsigned>(llvm::to_underlying(P) +
+                               llvm::to_underlying(D));
+}
+
+constexpr unsigned operator+(CodeCompletionDelta D, CodeCompletionPriority P) {
+  return P + D;
+}
+
 /// Priority value factors by which we will divide or multiply the
 /// priority of a code-completion result.
 enum {
diff --git a/clang/lib/Basic/DiagnosticIDs.cpp 
b/clang/lib/Basic/DiagnosticIDs.cpp
index 3709528e497d2..b7c6b722494ec 100644
--- a/clang/lib/Basic/DiagnosticIDs.cpp
+++ b/clang/lib/Basic/DiagnosticIDs.cpp
@@ -248,8 +248,8 @@ static const StaticDiagInfoRec *GetDiagInfo(unsigned 
DiagID) {
   unsigned ID = DiagID - DIAG_START_COMMON - 1;
 #define CATEGORY(NAME, PREV) \
   if (DiagID > DIAG_START_##NAME) { \
-    Offset += NUM_BUILTIN_##PREV##_DIAGNOSTICS - DIAG_START_##PREV - 1; \
-    ID -= DIAG_START_##NAME - DIAG_START_##PREV; \
+    Offset += llvm::to_underlying(NUM_BUILTIN_##PREV##_DIAGNOSTICS) - 
DIAG_START_##PREV - 1; \
+    ID -= llvm::to_underlying(DIAG_START_##NAME) - DIAG_START_##PREV; \
   }
 CATEGORY(DRIVER, COMMON)
 CATEGORY(FRONTEND, DRIVER)
diff --git a/clang/lib/Basic/Targets/AArch64.cpp 
b/clang/lib/Basic/Targets/AArch64.cpp
index a4841514be35e..a1d5b02cdaecb 100644
--- a/clang/lib/Basic/Targets/AArch64.cpp
+++ b/clang/lib/Basic/Targets/AArch64.cpp
@@ -26,18 +26,19 @@ using namespace clang;
 using namespace clang::targets;
 
 static constexpr int NumNeonBuiltins =
-    NEON::FirstFp16Builtin - Builtin::FirstTSBuiltin;
+    llvm::to_underlying(NEON::FirstFp16Builtin) - Builtin::FirstTSBuiltin;
 static constexpr int NumFp16Builtins =
-    NEON::FirstTSBuiltin - NEON::FirstFp16Builtin;
+    llvm::to_underlying(NEON::FirstTSBuiltin) - NEON::FirstFp16Builtin;
 static constexpr int NumSVEBuiltins =
-    SVE::FirstNeonBridgeBuiltin - NEON::FirstTSBuiltin;
+    llvm::to_underlying(SVE::FirstNeonBridgeBuiltin) - NEON::FirstTSBuiltin;
 static constexpr int NumSVENeonBridgeBuiltins =
-    SVE::FirstTSBuiltin - SVE::FirstNeonBridgeBuiltin;
-static constexpr int NumSMEBuiltins = SME::FirstTSBuiltin - 
SVE::FirstTSBuiltin;
+    llvm::to_underlying(SVE::FirstTSBuiltin) - SVE::FirstNeonBridgeBuiltin;
+static constexpr int NumSMEBuiltins =
+    llvm::to_underlying(SME::FirstTSBuiltin) - SVE::FirstTSBuiltin;
 static constexpr int NumAArch64Builtins =
-    AArch64::LastTSBuiltin - SME::FirstTSBuiltin;
+    llvm::to_underlying(AArch64::LastTSBuiltin) - SME::FirstTSBuiltin;
 static constexpr int NumBuiltins =
-    AArch64::LastTSBuiltin - Builtin::FirstTSBuiltin;
+    llvm::to_underlying(AArch64::LastTSBuiltin) - Builtin::FirstTSBuiltin;
 static_assert(NumBuiltins ==
               (NumNeonBuiltins + NumFp16Builtins + NumSVEBuiltins +
                NumSVENeonBridgeBuiltins + NumSMEBuiltins + 
NumAArch64Builtins));
diff --git a/clang/lib/Basic/Targets/AMDGPU.cpp 
b/clang/lib/Basic/Targets/AMDGPU.cpp
index c01e4c8074b24..1c2c2ecf44355 100644
--- a/clang/lib/Basic/Targets/AMDGPU.cpp
+++ b/clang/lib/Basic/Targets/AMDGPU.cpp
@@ -66,7 +66,7 @@ const LangASMap AMDGPUTargetInfo::AMDGPUAddrSpaceMap = {
 } // namespace clang
 
 static constexpr int NumBuiltins =
-    clang::AMDGPU::LastTSBuiltin - Builtin::FirstTSBuiltin;
+    llvm::to_underlying(clang::AMDGPU::LastTSBuiltin) - 
Builtin::FirstTSBuiltin;
 
 #define GET_BUILTIN_STR_TABLE
 #include "clang/Basic/BuiltinsAMDGPU.inc"
diff --git a/clang/lib/Basic/Targets/ARM.cpp b/clang/lib/Basic/Targets/ARM.cpp
index 0e424d031700b..15508f9a3a525 100644
--- a/clang/lib/Basic/Targets/ARM.cpp
+++ b/clang/lib/Basic/Targets/ARM.cpp
@@ -1045,16 +1045,16 @@ void ARMTargetInfo::getTargetDefines(const LangOptions 
&Opts,
   }
 }
 
-static constexpr int NumBuiltins = ARM::LastTSBuiltin - 
Builtin::FirstTSBuiltin;
+static constexpr int NumBuiltins = llvm::to_underlying(ARM::LastTSBuiltin) - 
Builtin::FirstTSBuiltin;
 static constexpr int NumNeonBuiltins =
-    NEON::FirstFp16Builtin - Builtin::FirstTSBuiltin;
+    llvm::to_underlying(NEON::FirstFp16Builtin) - Builtin::FirstTSBuiltin;
 static constexpr int NumFp16Builtins =
-    NEON::FirstTSBuiltin - NEON::FirstFp16Builtin;
+    llvm::to_underlying(NEON::FirstTSBuiltin) - NEON::FirstFp16Builtin;
 static constexpr int NumMVEBuiltins =
-    ARM::FirstCDEBuiltin - NEON::FirstTSBuiltin;
+    llvm::to_underlying(ARM::FirstCDEBuiltin) - NEON::FirstTSBuiltin;
 static constexpr int NumCDEBuiltins =
-    ARM::FirstARMBuiltin - ARM::FirstCDEBuiltin;
-static constexpr int NumARMBuiltins = ARM::LastTSBuiltin - 
ARM::FirstARMBuiltin;
+    llvm::to_underlying(ARM::FirstARMBuiltin) - ARM::FirstCDEBuiltin;
+static constexpr int NumARMBuiltins = llvm::to_underlying(ARM::LastTSBuiltin) 
- ARM::FirstARMBuiltin;
 static_assert(NumBuiltins ==
               (NumNeonBuiltins + NumFp16Builtins + NumMVEBuiltins +
                NumCDEBuiltins + NumARMBuiltins));
diff --git a/clang/lib/Basic/Targets/AVR.cpp b/clang/lib/Basic/Targets/AVR.cpp
index 18db0a7807b53..2603fc149eee9 100644
--- a/clang/lib/Basic/Targets/AVR.cpp
+++ b/clang/lib/Basic/Targets/AVR.cpp
@@ -19,7 +19,8 @@
 using namespace clang;
 using namespace clang::targets;
 
-static constexpr int NumBuiltins = AVR::LastTSBuiltin - 
Builtin::FirstTSBuiltin;
+static constexpr int NumBuiltins =
+    llvm::to_underlying(AVR::LastTSBuiltin) - Builtin::FirstTSBuiltin;
 
 static constexpr llvm::StringTable BuiltinStrings =
     CLANG_BUILTIN_STR_TABLE_START
diff --git a/clang/lib/Basic/Targets/BPF.cpp b/clang/lib/Basic/Targets/BPF.cpp
index 100769ea4cdb1..eb476c64b55e2 100644
--- a/clang/lib/Basic/Targets/BPF.cpp
+++ b/clang/lib/Basic/Targets/BPF.cpp
@@ -19,7 +19,7 @@ using namespace clang;
 using namespace clang::targets;
 
 static constexpr int NumBuiltins =
-    clang::BPF::LastTSBuiltin - Builtin::FirstTSBuiltin;
+    llvm::to_underlying(clang::BPF::LastTSBuiltin) - Builtin::FirstTSBuiltin;
 
 #define GET_BUILTIN_STR_TABLE
 #include "clang/Basic/BuiltinsBPF.inc"
diff --git a/clang/lib/Basic/Targets/DirectX.cpp 
b/clang/lib/Basic/Targets/DirectX.cpp
index ef8998dab0840..148fb7106d5f8 100644
--- a/clang/lib/Basic/Targets/DirectX.cpp
+++ b/clang/lib/Basic/Targets/DirectX.cpp
@@ -18,7 +18,7 @@ using namespace clang;
 using namespace clang::targets;
 
 static constexpr int NumBuiltins =
-    clang::DirectX::LastTSBuiltin - Builtin::FirstTSBuiltin;
+    llvm::to_underlying(clang::DirectX::LastTSBuiltin) - 
Builtin::FirstTSBuiltin;
 
 #define GET_BUILTIN_STR_TABLE
 #include "clang/Basic/BuiltinsDirectX.inc"
diff --git a/clang/lib/Basic/Targets/Hexagon.cpp 
b/clang/lib/Basic/Targets/Hexagon.cpp
index 615114f0fd1ea..4fb4e1f5f3e11 100644
--- a/clang/lib/Basic/Targets/Hexagon.cpp
+++ b/clang/lib/Basic/Targets/Hexagon.cpp
@@ -220,7 +220,7 @@ ArrayRef<TargetInfo::GCCRegAlias> 
HexagonTargetInfo::getGCCRegAliases() const {
 }
 
 static constexpr int NumBuiltins =
-    clang::Hexagon::LastTSBuiltin - Builtin::FirstTSBuiltin;
+    llvm::to_underlying(clang::Hexagon::LastTSBuiltin) - 
Builtin::FirstTSBuiltin;
 
 #define GET_BUILTIN_STR_TABLE
 #include "clang/Basic/BuiltinsHexagon.inc"
diff --git a/clang/lib/Basic/Targets/LoongArch.cpp 
b/clang/lib/Basic/Targets/LoongArch.cpp
index eabb1498a4935..d85105772960c 100644
--- a/clang/lib/Basic/Targets/LoongArch.cpp
+++ b/clang/lib/Basic/Targets/LoongArch.cpp
@@ -296,13 +296,13 @@ void LoongArchTargetInfo::getTargetDefines(const 
LangOptions &Opts,
 }
 
 static constexpr int NumBaseBuiltins =
-    LoongArch::FirstLSXBuiltin - Builtin::FirstTSBuiltin;
+    llvm::to_underlying(LoongArch::FirstLSXBuiltin) - Builtin::FirstTSBuiltin;
 static constexpr int NumLSXBuiltins =
-    LoongArch::FirstLASXBuiltin - LoongArch::FirstLSXBuiltin;
+    llvm::to_underlying(LoongArch::FirstLASXBuiltin) - 
LoongArch::FirstLSXBuiltin;
 static constexpr int NumLASXBuiltins =
-    LoongArch::LastTSBuiltin - LoongArch::FirstLASXBuiltin;
+    llvm::to_underlying(LoongArch::LastTSBuiltin) - 
LoongArch::FirstLASXBuiltin;
 static constexpr int NumBuiltins =
-    LoongArch::LastTSBuiltin - Builtin::FirstTSBuiltin;
+    llvm::to_underlying(LoongArch::LastTSBuiltin) - Builtin::FirstTSBuiltin;
 static_assert(NumBuiltins ==
               (NumBaseBuiltins + NumLSXBuiltins + NumLASXBuiltins));
 
diff --git a/clang/lib/Basic/Targets/Mips.cpp b/clang/lib/Basic/Targets/Mips.cpp
index 76c9081567053..f9c046aac1bad 100644
--- a/clang/lib/Basic/Targets/Mips.cpp
+++ b/clang/lib/Basic/Targets/Mips.cpp
@@ -20,7 +20,7 @@ using namespace clang;
 using namespace clang::targets;
 
 static constexpr int NumBuiltins =
-    clang::Mips::LastTSBuiltin - Builtin::FirstTSBuiltin;
+    llvm::to_underlying(clang::Mips::LastTSBuiltin) - Builtin::FirstTSBuiltin;
 
 static constexpr llvm::StringTable BuiltinStrings =
     CLANG_BUILTIN_STR_TABLE_START
diff --git a/clang/lib/Basic/Targets/NVPTX.cpp 
b/clang/lib/Basic/Targets/NVPTX.cpp
index de99a6718f26c..0185db5d1e65e 100644
--- a/clang/lib/Basic/Targets/NVPTX.cpp
+++ b/clang/lib/Basic/Targets/NVPTX.cpp
@@ -20,7 +20,7 @@ using namespace clang;
 using namespace clang::targets;
 
 static constexpr int NumBuiltins =
-    clang::NVPTX::LastTSBuiltin - Builtin::FirstTSBuiltin;
+    llvm::to_underlying(clang::NVPTX::LastTSBuiltin) - Builtin::FirstTSBuiltin;
 
 #define GET_BUILTIN_STR_TABLE
 #include "clang/Basic/BuiltinsNVPTX.inc"
diff --git a/clang/lib/Basic/Targets/PPC.cpp b/clang/lib/Basic/Targets/PPC.cpp
index b293bdb05f241..bd1711e15de04 100644
--- a/clang/lib/Basic/Targets/PPC.cpp
+++ b/clang/lib/Basic/Targets/PPC.cpp
@@ -21,7 +21,7 @@ using namespace clang;
 using namespace clang::targets;
 
 static constexpr int NumBuiltins =
-    clang::PPC::LastTSBuiltin - Builtin::FirstTSBuiltin;
+    llvm::to_underlying(clang::PPC::LastTSBuiltin) - Builtin::FirstTSBuiltin;
 
 static constexpr llvm::StringTable BuiltinStrings =
     CLANG_BUILTIN_STR_TABLE_START
diff --git a/clang/lib/Basic/Targets/RISCV.cpp 
b/clang/lib/Basic/Targets/RISCV.cpp
index c282136cf5fcf..fce1f46090d82 100644
--- a/clang/lib/Basic/Targets/RISCV.cpp
+++ b/clang/lib/Basic/Targets/RISCV.cpp
@@ -267,15 +267,15 @@ void RISCVTargetInfo::getTargetDefines(const LangOptions 
&Opts,
 }
 
 static constexpr int NumRVVBuiltins =
-    RISCVVector::FirstSiFiveBuiltin - Builtin::FirstTSBuiltin;
+    llvm::to_underlying(RISCVVector::FirstSiFiveBuiltin) - 
Builtin::FirstTSBuiltin;
 static constexpr int NumRVVSiFiveBuiltins =
-    RISCVVector::FirstAndesBuiltin - RISCVVector::FirstSiFiveBuiltin;
+    llvm::to_underlying(RISCVVector::FirstAndesBuiltin) - 
RISCVVector::FirstSiFiveBuiltin;
 static constexpr int NumRVVAndesBuiltins =
-    RISCVVector::FirstTSBuiltin - RISCVVector::FirstAndesBuiltin;
+    llvm::to_underlying(RISCVVector::FirstTSBuiltin) - 
RISCVVector::FirstAndesBuiltin;
 static constexpr int NumRISCVBuiltins =
-    RISCV::LastTSBuiltin - RISCVVector::FirstTSBuiltin;
+    llvm::to_underlying(RISCV::LastTSBuiltin) - RISCVVector::FirstTSBuiltin;
 static constexpr int NumBuiltins =
-    RISCV::LastTSBuiltin - Builtin::FirstTSBuiltin;
+    llvm::to_underlying(RISCV::LastTSBuiltin) - Builtin::FirstTSBuiltin;
 static_assert(NumBuiltins == (NumRVVBuiltins + NumRVVSiFiveBuiltins +
                               NumRVVAndesBuiltins + NumRISCVBuiltins));
 
diff --git a/clang/lib/Basic/Targets/SPIR.cpp b/clang/lib/Basic/Targets/SPIR.cpp
index 3eb62c9051b58..546f063f8414f 100644
--- a/clang/lib/Basic/Targets/SPIR.cpp
+++ b/clang/lib/Basic/Targets/SPIR.cpp
@@ -20,7 +20,7 @@ using namespace clang;
 using namespace clang::targets;
 
 static constexpr int NumBuiltins =
-    clang::SPIRV::LastTSBuiltin - Builtin::FirstTSBuiltin;
+    llvm::to_underlying(clang::SPIRV::LastTSBuiltin) - Builtin::FirstTSBuiltin;
 
 #define GET_BUILTIN_STR_TABLE
 #include "clang/Basic/BuiltinsSPIRVCommon.inc"
diff --git a/clang/lib/Basic/Targets/SystemZ.cpp 
b/clang/lib/Basic/Targets/SystemZ.cpp
index 080a961b95d0d..96c1c5e9d822e 100644
--- a/clang/lib/Basic/Targets/SystemZ.cpp
+++ b/clang/lib/Basic/Targets/SystemZ.cpp
@@ -22,9 +22,9 @@ using namespace clang;
 using namespace clang::targets;
 
 static constexpr int NumBuiltins =
-    clang::SystemZ::LastSystemZBuiltin - Builtin::FirstTSBuiltin + 1;
+    llvm::to_underlying(clang::SystemZ::LastSystemZBuiltin) - 
Builtin::FirstTSBuiltin + 1;
 static constexpr int NumBuiltinsZOS =
-    clang::SystemZ::LastTSBuiltin - clang::SystemZ::LastSystemZBuiltin - 1;
+    llvm::to_underlying(clang::SystemZ::LastTSBuiltin) - 
clang::SystemZ::LastSystemZBuiltin - 1;
 
 #define GET_BUILTIN_STR_TABLE
 #include "clang/Basic/BuiltinsSystemZ.inc"
diff --git a/clang/lib/Basic/Targets/VE.cpp b/clang/lib/Basic/Targets/VE.cpp
index 5451f3c303637..329a809e36bc6 100644
--- a/clang/lib/Basic/Targets/VE.cpp
+++ b/clang/lib/Basic/Targets/VE.cpp
@@ -19,7 +19,7 @@ using namespace clang;
 using namespace clang::targets;
 
 static constexpr int NumBuiltins =
-    clang::VE::LastTSBuiltin - Builtin::FirstTSBuiltin;
+    llvm::to_underlying(clang::VE::LastTSBuiltin) - Builtin::FirstTSBuiltin;
 
 static constexpr llvm::StringTable BuiltinStrings =
     CLANG_BUILTIN_STR_TABLE_START
diff --git a/clang/lib/Basic/Targets/WebAssembly.cpp 
b/clang/lib/Basic/Targets/WebAssembly.cpp
index a483e3d6f9b10..ab18d3330a74f 100644
--- a/clang/lib/Basic/Targets/WebAssembly.cpp
+++ b/clang/lib/Basic/Targets/WebAssembly.cpp
@@ -21,7 +21,7 @@ using namespace clang;
 using namespace clang::targets;
 
 static constexpr int NumBuiltins =
-    clang::WebAssembly::LastTSBuiltin - Builtin::FirstTSBuiltin;
+    llvm::to_underlying(clang::WebAssembly::LastTSBuiltin) - 
Builtin::FirstTSBuiltin;
 
 static constexpr llvm::StringTable BuiltinStrings =
     CLANG_BUILTIN_STR_TABLE_START
diff --git a/clang/lib/Basic/Targets/X86.cpp b/clang/lib/Basic/Targets/X86.cpp
index 8ab39b750dc99..2d20c59722b4a 100644
--- a/clang/lib/Basic/Targets/X86.cpp
+++ b/clang/lib/Basic/Targets/X86.cpp
@@ -24,10 +24,10 @@ namespace targets {
 
 // The x86-32 builtins are a subset and prefix of the x86-64 builtins.
 static constexpr int NumX86Builtins =
-    X86::LastX86CommonBuiltin - Builtin::FirstTSBuiltin + 1;
+    llvm::to_underlying(X86::LastX86CommonBuiltin) - Builtin::FirstTSBuiltin + 
1;
 static constexpr int NumX86_64Builtins =
-    X86::LastTSBuiltin - X86::FirstX86_64Builtin;
-static constexpr int NumBuiltins = X86::LastTSBuiltin - 
Builtin::FirstTSBuiltin;
+    llvm::to_underlying(X86::LastTSBuiltin) - X86::FirstX86_64Builtin;
+static constexpr int NumBuiltins = llvm::to_underlying(X86::LastTSBuiltin) - 
Builtin::FirstTSBuiltin;
 static_assert(NumBuiltins == (NumX86Builtins + NumX86_64Builtins));
 
 namespace X86 {
diff --git a/clang/lib/Basic/Targets/XCore.cpp 
b/clang/lib/Basic/Targets/XCore.cpp
index c725703ede5b0..2adc2bde7aa9b 100644
--- a/clang/lib/Basic/Targets/XCore.cpp
+++ b/clang/lib/Basic/Targets/XCore.cpp
@@ -19,7 +19,7 @@ using namespace clang;
 using namespace clang::targets;
 
 static constexpr int NumBuiltins =
-    XCore::LastTSBuiltin - Builtin::FirstTSBuiltin;
+    llvm::to_underlying(XCore::LastTSBuiltin) - Builtin::FirstTSBuiltin;
 
 static constexpr llvm::StringTable BuiltinStrings =
     CLANG_BUILTIN_STR_TABLE_START
diff --git a/clang/lib/CodeGen/CGDecl.cpp b/clang/lib/CodeGen/CGDecl.cpp
index 1ed8989d3f627..6365744f2254c 100644
--- a/clang/lib/CodeGen/CGDecl.cpp
+++ b/clang/lib/CodeGen/CGDecl.cpp
@@ -1170,7 +1170,7 @@ Address CodeGenModule::createUnnamedGlobalFrom(const 
VarDecl &D,
     if (D.hasGlobalStorage())
       Name = getMangledName(&D).str() + ".const";
     else if (const DeclContext *DC = D.getParentFunctionOrMethod())
-      Name = ("__const." + FunctionName(DC) + "." + D.getName()).str();
+      Name = (Twine("__const.") + FunctionName(DC) + "." + D.getName()).str();
     else
       llvm_unreachable("local variable has no parent function or method");
     llvm::GlobalVariable *GV = new llvm::GlobalVariable(
diff --git a/clang/lib/CodeGen/CGExpr.cpp b/clang/lib/CodeGen/CGExpr.cpp
index eba802e187beb..6dee25dbf7eb7 100644
--- a/clang/lib/CodeGen/CGExpr.cpp
+++ b/clang/lib/CodeGen/CGExpr.cpp
@@ -6105,7 +6105,7 @@ LValue CodeGenFunction::EmitCompoundLiteralLValue(const 
CompoundLiteralExpr *E){
     if (QualType::DestructionKind DtorKind = E->getType().isDestructedType())
       pushLifetimeExtendedDestroy(getCleanupKind(DtorKind), DeclPtr,
                                   E->getType(), getDestroyer(DtorKind),
-                                  DtorKind & EHCleanup);
+                                  needsEHCleanup(DtorKind));
 
   return Result;
 }
diff --git a/clang/lib/CodeGen/CGExprAgg.cpp b/clang/lib/CodeGen/CGExprAgg.cpp
index f18978c7a936e..411c3b95bf6e1 100644
--- a/clang/lib/CodeGen/CGExprAgg.cpp
+++ b/clang/lib/CodeGen/CGExprAgg.cpp
@@ -816,7 +816,7 @@ void 
AggExprEmitter::VisitCompoundLiteralExpr(CompoundLiteralExpr *E) {
     if (QualType::DestructionKind DtorKind = E->getType().isDestructedType())
       CGF.pushLifetimeExtendedDestroy(
           CGF.getCleanupKind(DtorKind), Slot.getAddress(), E->getType(),
-          CGF.getDestroyer(DtorKind), DtorKind & EHCleanup);
+          CGF.getDestroyer(DtorKind), CGF.needsEHCleanup(DtorKind));
 }
 
 /// Attempt to look through various unimportant expressions to find a
diff --git a/clang/lib/CodeGen/CGObjCGNU.cpp b/clang/lib/CodeGen/CGObjCGNU.cpp
index 43e4c02411d15..29fdb49bbd5e1 100644
--- a/clang/lib/CodeGen/CGObjCGNU.cpp
+++ b/clang/lib/CodeGen/CGObjCGNU.cpp
@@ -188,7 +188,7 @@ class CGObjCGNU : public CGObjCRuntime {
   }
 
   std::string SymbolForProtocolRef(StringRef Name) {
-    return (ManglePublicSymbol("OBJC_REF_PROTOCOL_") + Name).str();
+    return (Twine(ManglePublicSymbol("OBJC_REF_PROTOCOL_")) + Name).str();
   }
 
 
@@ -986,13 +986,13 @@ class CGObjCGNUstep2 : public CGObjCGNUstep {
 
   std::string SymbolForClassRef(StringRef Name, bool isWeak) {
     if (isWeak)
-      return (ManglePublicSymbol("OBJC_WEAK_REF_CLASS_") + Name).str();
+      return (Twine(ManglePublicSymbol("OBJC_WEAK_REF_CLASS_")) + Name).str();
     else
-      return (ManglePublicSymbol("OBJC_REF_CLASS_") + Name).str();
+      return (Twine(ManglePublicSymbol("OBJC_REF_CLASS_")) + Name).str();
   }
   /// Generate the name of a class symbol.
   std::string SymbolForClass(StringRef Name) {
-    return (ManglePublicSymbol("OBJC_CLASS_") + Name).str();
+    return (Twine(ManglePublicSymbol("OBJC_CLASS_")) + Name).str();
   }
   void CallRuntimeFunction(CGBuilderTy &B, StringRef FunctionName,
       ArrayRef<llvm::Value*> Args) {
@@ -1496,8 +1496,8 @@ class CGObjCGNUstep2 : public CGObjCGNUstep {
   llvm::Constant *GetConstantSelector(Selector Sel,
                                       const std::string &TypeEncoding) 
override {
     std::string MangledTypes = GetSymbolNameForTypeEncoding(TypeEncoding);
-    auto SelVarName = (StringRef(".objc_selector_") + Sel.getAsString() + "_" +
-      MangledTypes).str();
+    auto SelVarName = (Twine(".objc_selector_") + Sel.getAsString() + "_" +
+                       MangledTypes).str();
     if (auto *GV = TheModule.getNamedGlobal(SelVarName))
       return GV;
     ConstantInitBuilder builder(CGM);
diff --git a/clang/lib/CodeGen/CGOpenMPRuntime.cpp 
b/clang/lib/CodeGen/CGOpenMPRuntime.cpp
index 1ad07936e6f05..a9e2511138e91 100644
--- a/clang/lib/CodeGen/CGOpenMPRuntime.cpp
+++ b/clang/lib/CodeGen/CGOpenMPRuntime.cpp
@@ -1260,7 +1260,7 @@ static llvm::Function 
*emitParallelOrTeamsOutlinedFunction(
 
 std::string CGOpenMPRuntime::getOutlinedHelperName(StringRef Name) const {
   std::string Suffix = getName({"omp_outlined"});
-  return (Name + Suffix).str();
+  return (Twine(Name) + Suffix).str();
 }
 
 std::string CGOpenMPRuntime::getOutlinedHelperName(CodeGenFunction &CGF) const 
{
@@ -1269,7 +1269,7 @@ std::string 
CGOpenMPRuntime::getOutlinedHelperName(CodeGenFunction &CGF) const {
 
 std::string CGOpenMPRuntime::getReductionFuncName(StringRef Name) const {
   std::string Suffix = getName({"omp", "reduction", "reduction_func"});
-  return (Name + Suffix).str();
+  return (Twine(Name) + Suffix).str();
 }
 
 llvm::Function *CGOpenMPRuntime::emitParallelOutlinedFunction(
diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index 7a742e404bf5c..4f57db27bd2de 100644
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -5938,7 +5938,7 @@ void Driver::generatePrefixedToolNames(
     StringRef Tool, const ToolChain &TC,
     SmallVectorImpl<std::string> &Names) const {
   // FIXME: Needs a better variable than TargetTriple
-  Names.emplace_back((TargetTriple + "-" + Tool).str());
+  Names.emplace_back((Twine(TargetTriple) + "-" + Tool).str());
   Names.emplace_back(Tool);
 }
 
@@ -5962,7 +5962,7 @@ std::string Driver::GetProgramPath(StringRef Name, const 
ToolChain &TC) const {
       if (ScanDirForExecutable(P, Name))
         return std::string(P);
     } else {
-      SmallString<128> P((PrefixDir + Name).str());
+      SmallString<128> P((Twine(PrefixDir) + Name).str());
       if (llvm::sys::fs::can_execute(Twine(P)))
         return std::string(P);
     }
diff --git a/clang/lib/Driver/ToolChains/Gnu.cpp 
b/clang/lib/Driver/ToolChains/Gnu.cpp
index 7591d9f7fa418..0aa46b1a58b63 100644
--- a/clang/lib/Driver/ToolChains/Gnu.cpp
+++ b/clang/lib/Driver/ToolChains/Gnu.cpp
@@ -2122,11 +2122,11 @@ void Generic_GCC::GCCInstallationDetector::init(
     StringRef OSEnv = TargetTriple.getOSAndEnvironmentName();
     if (TargetTriple.getEnvironment() == llvm::Triple::GNUX32)
       OSEnv = "linux-gnu";
-    TripleNoVendor = (TargetTriple.getArchName().str() + '-' + OSEnv).str();
+    TripleNoVendor = (TargetTriple.getArchName() + "-" + OSEnv).str();
     CandidateTripleAliases.push_back(TripleNoVendor);
     if (BiarchVariantTriple.getArch() != llvm::Triple::UnknownArch) {
       BiarchTripleNoVendor =
-          (BiarchVariantTriple.getArchName().str() + '-' + OSEnv).str();
+          (BiarchVariantTriple.getArchName() + "-" + OSEnv).str();
       CandidateBiarchTripleAliases.push_back(BiarchTripleNoVendor);
     }
   }
@@ -2939,9 +2939,10 @@ void 
Generic_GCC::GCCInstallationDetector::ScanLibDirForGCCTriple(
       // using LI to ensure stable path separators across Windows and
       // Linux.
       Installation.GCCInstallPath =
-          (LibDir + "/" + LibSuffix + "/" + VersionText).str();
+          (Twine(LibDir) + "/" + LibSuffix + "/" + VersionText).str();
       Installation.GCCParentLibPath =
-          (Installation.GCCInstallPath + "/../" + Suffix.ReversePath).str();
+          (Twine(Installation.GCCInstallPath) + "/../" + Suffix.ReversePath)
+              .str();
       Installation.SelectedMultilib = getMultilib();
 
       Installations.push_back(Installation);
diff --git a/clang/lib/Driver/ToolChains/MinGW.cpp 
b/clang/lib/Driver/ToolChains/MinGW.cpp
index 2ab9ba4ea7cda..e93f7b0a7862d 100644
--- a/clang/lib/Driver/ToolChains/MinGW.cpp
+++ b/clang/lib/Driver/ToolChains/MinGW.cpp
@@ -564,11 +564,14 @@ toolchains::MinGW::MinGW(const Driver &D, const 
llvm::Triple &Triple,
     SubdirName = CandidateSubdir;
 
   getFilePaths().push_back(
-      (Base + SubdirName + llvm::sys::path::get_separator() + "lib").str());
+      (Twine(Base) + SubdirName + llvm::sys::path::get_separator() + "lib")
+          .str());
 
   // Gentoo
   getFilePaths().push_back(
-      (Base + SubdirName + llvm::sys::path::get_separator() + 
"mingw/lib").str());
+      (Twine(Base) + SubdirName + llvm::sys::path::get_separator() +
+       "mingw/lib")
+          .str());
 
   // Only include <base>/lib if we're not cross compiling (not even for
   // windows->windows to a different arch), or if the sysroot has been set
@@ -829,8 +832,8 @@ void toolchains::MinGW::AddClangCXXStdlibIncludeArgs(
 
   switch (GetCXXStdlibType(DriverArgs)) {
   case ToolChain::CST_Libcxx: {
-    std::string TargetDir = (Base + "include" + Slash + getTripleString() +
-                             Slash + "c++" + Slash + "v1")
+    std::string TargetDir = (Twine(Base) + "include" + Slash +
+                             getTripleString() + Slash + "c++" + Slash + "v1")
                                 .str();
     if (getDriver().getVFS().exists(TargetDir))
       addSystemInclude(DriverArgs, CC1Args, TargetDir);
diff --git a/clang/lib/Frontend/FrontendAction.cpp 
b/clang/lib/Frontend/FrontendAction.cpp
index 877ef662fe8da..4e94ab834366f 100644
--- a/clang/lib/Frontend/FrontendAction.cpp
+++ b/clang/lib/Frontend/FrontendAction.cpp
@@ -389,6 +389,10 @@ void FrontendAction::EndSourceFileAction() {
     getCompilerInstance().getPreprocessor().SetEnableMacroExpansion();
 }
 
+void FrontendAction::setCurrentInput(const FrontendInputFile &CurrentInput) {
+  setCurrentInput(CurrentInput, nullptr);
+}
+
 void FrontendAction::setCurrentInput(const FrontendInputFile &CurrentInput,
                                      std::unique_ptr<ASTUnit> AST) {
   this->CurrentInput = CurrentInput;
diff --git a/clang/lib/StaticAnalyzer/Checkers/ExprInspectionChecker.cpp 
b/clang/lib/StaticAnalyzer/Checkers/ExprInspectionChecker.cpp
index 93e3e3ca2322a..9e2bdd1e074b8 100644
--- a/clang/lib/StaticAnalyzer/Checkers/ExprInspectionChecker.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/ExprInspectionChecker.cpp
@@ -483,8 +483,8 @@ class SymbolExpressor
     if (std::optional<std::string> Str = lookup(S))
       return Str;
     if (std::optional<std::string> Str = Visit(S->getLHS()))
-      return (*Str + " " + BinaryOperator::getOpcodeStr(S->getOpcode()) + " " +
-              std::to_string(S->getRHS()->getLimitedValue()) +
+      return (Twine(*Str) + " " + BinaryOperator::getOpcodeStr(S->getOpcode()) 
+
+              " " + std::to_string(S->getRHS()->getLimitedValue()) +
               (S->getRHS()->isUnsigned() ? "U" : ""))
           .str();
     return std::nullopt;
@@ -495,8 +495,8 @@ class SymbolExpressor
       return Str;
     if (std::optional<std::string> Str1 = Visit(S->getLHS()))
       if (std::optional<std::string> Str2 = Visit(S->getRHS()))
-        return (*Str1 + " " + BinaryOperator::getOpcodeStr(S->getOpcode()) +
-                " " + *Str2)
+        return (Twine(*Str1) + " " +
+                BinaryOperator::getOpcodeStr(S->getOpcode()) + " " + *Str2)
             .str();
     return std::nullopt;
   }
@@ -505,7 +505,7 @@ class SymbolExpressor
     if (std::optional<std::string> Str = lookup(S))
       return Str;
     if (std::optional<std::string> Str = Visit(S->getOperand()))
-      return (UnaryOperator::getOpcodeStr(S->getOpcode()) + *Str).str();
+      return (Twine(UnaryOperator::getOpcodeStr(S->getOpcode())) + *Str).str();
     return std::nullopt;
   }
 
diff --git a/clang/lib/StaticAnalyzer/Core/TextDiagnostics.cpp 
b/clang/lib/StaticAnalyzer/Core/TextDiagnostics.cpp
index 43500f619896a..cfec79ff61586 100644
--- a/clang/lib/StaticAnalyzer/Core/TextDiagnostics.cpp
+++ b/clang/lib/StaticAnalyzer/Core/TextDiagnostics.cpp
@@ -87,7 +87,7 @@ class TextDiagnostics : public PathDiagnosticConsumer {
                                     : "")
                                    .str();
       reportPiece(WarnID, PD->getLocation().asLocation(),
-                  (PD->getShortDescription() + WarningMsg).str(),
+                  (Twine(PD->getShortDescription()) + WarningMsg).str(),
                   PD->path.back()->getRanges(), PD->path.back()->getFixits());
 
       // First, add extra notes, even if paths should not be included.
diff --git a/clang/lib/Tooling/Core/Replacement.cpp 
b/clang/lib/Tooling/Core/Replacement.cpp
index 10bdc223e33f2..30ecf9ff7df04 100644
--- a/clang/lib/Tooling/Core/Replacement.cpp
+++ b/clang/lib/Tooling/Core/Replacement.cpp
@@ -393,7 +393,7 @@ class MergedReplacement {
       unsigned End = Offset + Length;
       StringRef RText = R.getReplacementText();
       StringRef Tail = RText.substr(End - R.getOffset());
-      Text = (Text + Tail).str();
+      Text += Tail;
       if (R.getOffset() + RText.size() > End) {
         Length = R.getOffset() + R.getLength() - Offset;
         MergeSecond = true;
diff --git a/clang/lib/Tooling/Tooling.cpp b/clang/lib/Tooling/Tooling.cpp
index 71307d1fe7307..100078e902400 100644
--- a/clang/lib/Tooling/Tooling.cpp
+++ b/clang/lib/Tooling/Tooling.cpp
@@ -299,7 +299,7 @@ void 
addTargetAndModeForProgramName(std::vector<std::string> &CommandLine,
   }
   if (ShouldAddTarget) {
     CommandLine.insert(++CommandLine.begin(),
-                       (TargetOPT + TargetMode.TargetPrefix).str());
+                       (Twine(TargetOPT) + TargetMode.TargetPrefix).str());
   }
 }
 
diff --git a/clang/utils/TableGen/ClangBuiltinsEmitter.cpp 
b/clang/utils/TableGen/ClangBuiltinsEmitter.cpp
index 22c81522f9e41..83fdec71f4a73 100644
--- a/clang/utils/TableGen/ClangBuiltinsEmitter.cpp
+++ b/clang/utils/TableGen/ClangBuiltinsEmitter.cpp
@@ -480,7 +480,8 @@ void collectBuiltins(const Record *BuiltinRecord,
     for (StringRef Spelling :
          BuiltinRecord->getValueAsListOfStrings("Spellings")) {
       auto FullSpelling =
-          (Templates.IsPrefix ? Affix + Spelling : Spelling + Affix).str();
+          (Templates.IsPrefix ? Twine(Affix) + Spelling : Twine(Spelling) + 
Affix)
+              .str();
       BuiltinType BT = BuiltinType::Builtin;
       if (BuiltinRecord->isSubClassOf("AtomicBuiltin")) {
         BT = BuiltinType::AtomicBuiltin;

>From 9da9a97ca0af05bcb05a6095b9aad9a4f6fa7c9a Mon Sep 17 00:00:00 2001
From: Richard Dong <[email protected]>
Date: Mon, 21 Sep 2026 07:21:34 +0000
Subject: [PATCH 8/8] [llvm] C++26 fixes

---
 llvm/lib/CodeGen/GlobalISel/InlineAsmLowering.cpp      |  3 ++-
 llvm/lib/CodeGen/SelectionDAG/FastISel.cpp             |  3 ++-
 llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp  |  3 ++-
 llvm/lib/MC/MCObjectFileInfo.cpp                       |  4 ++--
 llvm/lib/MC/MCParser/DarwinAsmParser.cpp               |  8 ++++----
 llvm/lib/Target/AMDGPU/SIFrameLowering.cpp             |  4 ++--
 llvm/lib/Target/Hexagon/HexagonISelDAGToDAGHVX.cpp     |  2 +-
 .../LoongArch/MCTargetDesc/LoongArchAsmBackend.cpp     |  2 +-
 .../LoongArch/MCTargetDesc/LoongArchMCCodeEmitter.cpp  |  2 +-
 .../lib/Target/PowerPC/MCTargetDesc/PPCELFStreamer.cpp |  2 +-
 llvm/lib/Target/PowerPC/MCTargetDesc/PPCPredicates.h   | 10 ++++++++++
 llvm/lib/Target/RISCV/MCTargetDesc/RISCVAsmBackend.cpp |  2 +-
 .../SystemZ/MCTargetDesc/SystemZMCCodeEmitter.cpp      |  2 +-
 llvm/lib/Target/X86/MCTargetDesc/X86MCCodeEmitter.cpp  |  2 +-
 14 files changed, 31 insertions(+), 18 deletions(-)

diff --git a/llvm/lib/CodeGen/GlobalISel/InlineAsmLowering.cpp 
b/llvm/lib/CodeGen/GlobalISel/InlineAsmLowering.cpp
index 14ce305376459..899fd887ca7a7 100644
--- a/llvm/lib/CodeGen/GlobalISel/InlineAsmLowering.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/InlineAsmLowering.cpp
@@ -69,7 +69,8 @@ class ExtraFlags {
       Flags |= InlineAsm::Extra_MayUnwind;
     if (CB.isConvergent())
       Flags |= InlineAsm::Extra_IsConvergent;
-    Flags |= IA->getDialect() * InlineAsm::Extra_AsmDialect;
+    if (IA->getDialect() == InlineAsm::AD_Intel)
+      Flags |= InlineAsm::Extra_AsmDialect;
   }
 
   void update(const TargetLowering::AsmOperandInfo &OpInfo) {
diff --git a/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp 
b/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
index 8f1869b5e03a1..f431b5150d333 100644
--- a/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
@@ -1171,7 +1171,8 @@ bool FastISel::selectCall(const User *I) {
       ExtraInfo |= InlineAsm::Extra_MayUnwind;
     if (Call->isConvergent())
       ExtraInfo |= InlineAsm::Extra_IsConvergent;
-    ExtraInfo |= IA->getDialect() * InlineAsm::Extra_AsmDialect;
+    if (IA->getDialect() == InlineAsm::AD_Intel)
+      ExtraInfo |= InlineAsm::Extra_AsmDialect;
 
     MachineInstrBuilder MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, MIMD,
                                       TII.get(TargetOpcode::INLINEASM));
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp 
b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index 065347d903033..4e39bdb74fc56 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -10243,7 +10243,8 @@ class ExtraFlags {
       Flags |= InlineAsm::Extra_MayUnwind;
     if (Call.isConvergent())
       Flags |= InlineAsm::Extra_IsConvergent;
-    Flags |= IA->getDialect() * InlineAsm::Extra_AsmDialect;
+    if (IA->getDialect() == InlineAsm::AD_Intel)
+      Flags |= InlineAsm::Extra_AsmDialect;
   }
 
   void update(const TargetLowering::AsmOperandInfo &OpInfo) {
diff --git a/llvm/lib/MC/MCObjectFileInfo.cpp b/llvm/lib/MC/MCObjectFileInfo.cpp
index 5dd5a63fda9cf..3435df0762490 100644
--- a/llvm/lib/MC/MCObjectFileInfo.cpp
+++ b/llvm/lib/MC/MCObjectFileInfo.cpp
@@ -66,7 +66,7 @@ static bool useCompactUnwind(const Triple &T) {
 void MCObjectFileInfo::initMachOMCObjectFileInfo(const Triple &T) {
   EHFrameSection = Ctx->getMachOSection(
       "__TEXT", "__eh_frame",
-      MachO::S_COALESCED | MachO::S_ATTR_NO_TOC |
+      llvm::to_underlying(MachO::S_COALESCED) | MachO::S_ATTR_NO_TOC |
           MachO::S_ATTR_STRIP_STATIC_SYMS | MachO::S_ATTR_LIVE_SUPPORT,
       SectionKind::getReadOnly());
 
@@ -160,7 +160,7 @@ void MCObjectFileInfo::initMachOMCObjectFileInfo(const 
Triple &T) {
   if (ArchTy == Triple::ppc || ArchTy == Triple::ppc64) {
     TextCoalSection
       = Ctx->getMachOSection("__TEXT", "__textcoal_nt",
-                             MachO::S_COALESCED |
+                             llvm::to_underlying(MachO::S_COALESCED) |
                              MachO::S_ATTR_PURE_INSTRUCTIONS,
                              SectionKind::getText());
     ConstTextCoalSection
diff --git a/llvm/lib/MC/MCParser/DarwinAsmParser.cpp 
b/llvm/lib/MC/MCParser/DarwinAsmParser.cpp
index ba6813c142266..25e6cab7d9fee 100644
--- a/llvm/lib/MC/MCParser/DarwinAsmParser.cpp
+++ b/llvm/lib/MC/MCParser/DarwinAsmParser.cpp
@@ -269,7 +269,7 @@ class DarwinAsmParser : public MCAsmParserExtension {
 
   bool parseSectionDirectiveSymbolStub(StringRef, SMLoc) {
     return parseSectionSwitch("__TEXT","__symbol_stub",
-                              MachO::S_SYMBOL_STUBS |
+                              llvm::to_underlying(MachO::S_SYMBOL_STUBS) |
                               MachO::S_ATTR_PURE_INSTRUCTIONS,
                               // FIXME: Different on PPC and ARM.
                               0, 16);
@@ -277,7 +277,7 @@ class DarwinAsmParser : public MCAsmParserExtension {
 
   bool parseSectionDirectivePICSymbolStub(StringRef, SMLoc) {
     return parseSectionSwitch("__TEXT","__picsymbol_stub",
-                              MachO::S_SYMBOL_STUBS |
+                              llvm::to_underlying(MachO::S_SYMBOL_STUBS) |
                               MachO::S_ATTR_PURE_INSTRUCTIONS, 0, 26);
   }
 
@@ -365,13 +365,13 @@ class DarwinAsmParser : public MCAsmParserExtension {
   bool parseSectionDirectiveObjCClsRefs(StringRef, SMLoc) {
     return parseSectionSwitch("__OBJC", "__cls_refs",
                               MachO::S_ATTR_NO_DEAD_STRIP |
-                              MachO::S_LITERAL_POINTERS, 4);
+                              llvm::to_underlying(MachO::S_LITERAL_POINTERS), 
4);
   }
 
   bool parseSectionDirectiveObjCMessageRefs(StringRef, SMLoc) {
     return parseSectionSwitch("__OBJC", "__message_refs",
                               MachO::S_ATTR_NO_DEAD_STRIP |
-                              MachO::S_LITERAL_POINTERS, 4);
+                              llvm::to_underlying(MachO::S_LITERAL_POINTERS), 
4);
   }
 
   bool parseSectionDirectiveObjCSymbols(StringRef, SMLoc) {
diff --git a/llvm/lib/Target/AMDGPU/SIFrameLowering.cpp 
b/llvm/lib/Target/AMDGPU/SIFrameLowering.cpp
index 92fb77b1e6436..5a018a1b46d3d 100644
--- a/llvm/lib/Target/AMDGPU/SIFrameLowering.cpp
+++ b/llvm/lib/Target/AMDGPU/SIFrameLowering.cpp
@@ -81,7 +81,7 @@ static MCCFIInstruction createScaledCFAInPrivateWave(const 
GCNSubtarget &ST,
           << uint8_t(dwarf::DW_OP_lit0 + WavefrontSizeLog2)
           << uint8_t(dwarf::DW_OP_shl)
           << uint8_t(dwarf::DW_OP_lit0 +
-                     dwarf::DW_ASPACE_LLVM_AMDGPU_private_wave)
+                     
llvm::to_underlying(dwarf::DW_ASPACE_LLVM_AMDGPU_private_wave))
           << uint8_t(dwarf::DW_OP_LLVM_user)
           << uint8_t(dwarf::DW_OP_LLVM_form_aspace_address);
 
@@ -780,7 +780,7 @@ void 
SIFrameLowering::emitEntryFunctionPrologue(MachineFunction &MF,
         4, // length
         static_cast<char>(dwarf::DW_OP_lit0),
         static_cast<char>(dwarf::DW_OP_lit0 +
-                          dwarf::DW_ASPACE_LLVM_AMDGPU_private_wave),
+                          
llvm::to_underlying(dwarf::DW_ASPACE_LLVM_AMDGPU_private_wave)),
         static_cast<char>(dwarf::DW_OP_LLVM_user),
         static_cast<char>(dwarf::DW_OP_LLVM_form_aspace_address)};
     static StringRef CFAEncodedInstUserOps =
diff --git a/llvm/lib/Target/Hexagon/HexagonISelDAGToDAGHVX.cpp 
b/llvm/lib/Target/Hexagon/HexagonISelDAGToDAGHVX.cpp
index 129f3071a3a88..088cebe1d53d5 100644
--- a/llvm/lib/Target/Hexagon/HexagonISelDAGToDAGHVX.cpp
+++ b/llvm/lib/Target/Hexagon/HexagonISelDAGToDAGHVX.cpp
@@ -628,7 +628,7 @@ struct OpRef {
     assert(!R.isValue());
     return OpRef(R.OpN & (Undef | Index | HiHalf));
   }
-  static OpRef undef(MVT Ty) { return OpRef(Undef | Ty.SimpleTy); }
+  static OpRef undef(MVT Ty) { return OpRef(Undef | 
llvm::to_underlying(Ty.SimpleTy)); }
 
   // Direct value.
   SDValue OpV = SDValue();
diff --git a/llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchAsmBackend.cpp 
b/llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchAsmBackend.cpp
index 4581da3c7b9c3..1895fa2eb9920 100644
--- a/llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchAsmBackend.cpp
+++ b/llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchAsmBackend.cpp
@@ -252,7 +252,7 @@ bool LoongArchAsmBackend::relaxAlign(MCFragment &F, 
unsigned &Size) {
         Ctx);
   }
   MCFixup Fixup =
-      MCFixup::create(0, Expr, FirstLiteralRelocationKind + 
ELF::R_LARCH_ALIGN);
+      MCFixup::create(0, Expr, FirstLiteralRelocationKind + 
llvm::to_underlying(ELF::R_LARCH_ALIGN));
   F.setVarFixups({Fixup});
   F.setLinkerRelaxable();
   return true;
diff --git a/llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchMCCodeEmitter.cpp 
b/llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchMCCodeEmitter.cpp
index 8146a15eba295..3a77bd154ca2c 100644
--- a/llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchMCCodeEmitter.cpp
+++ b/llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchMCCodeEmitter.cpp
@@ -166,7 +166,7 @@ LoongArchMCCodeEmitter::getExprOpValue(const MCInst &MI, 
const MCOperand &MO,
       // `la.abs`.
       Fixups.push_back(
           MCFixup::create(0, MCConstantExpr::create(0, Ctx),
-                          FirstLiteralRelocationKind + ELF::R_LARCH_MARK_LA));
+                          FirstLiteralRelocationKind + 
llvm::to_underlying(ELF::R_LARCH_MARK_LA)));
       [[fallthrough]];
     case ELF::R_LARCH_ABS_HI20:
       FixupKind = LoongArch::fixup_loongarch_abs_hi20;
diff --git a/llvm/lib/Target/PowerPC/MCTargetDesc/PPCELFStreamer.cpp 
b/llvm/lib/Target/PowerPC/MCTargetDesc/PPCELFStreamer.cpp
index 7b2d2be503d72..0a64998a213c7 100644
--- a/llvm/lib/Target/PowerPC/MCTargetDesc/PPCELFStreamer.cpp
+++ b/llvm/lib/Target/PowerPC/MCTargetDesc/PPCELFStreamer.cpp
@@ -157,7 +157,7 @@ void PPCELFStreamer::emitGOTToPCRelReloc(const MCInst 
&Inst) {
   MCFragment *F = LabelSym->getFragment();
   F->addFixup(
       MCFixup::create(LabelSym->getOffset() - 8, SubExpr2,
-                      FirstLiteralRelocationKind + ELF::R_PPC64_PCREL_OPT));
+                      FirstLiteralRelocationKind + 
llvm::to_underlying(ELF::R_PPC64_PCREL_OPT)));
   emitLabel(CurrentLocation, Inst.getLoc());
 }
 
diff --git a/llvm/lib/Target/PowerPC/MCTargetDesc/PPCPredicates.h 
b/llvm/lib/Target/PowerPC/MCTargetDesc/PPCPredicates.h
index d686a8ea2a228..cd73179274110 100644
--- a/llvm/lib/Target/PowerPC/MCTargetDesc/PPCPredicates.h
+++ b/llvm/lib/Target/PowerPC/MCTargetDesc/PPCPredicates.h
@@ -13,6 +13,8 @@
 #ifndef LLVM_LIB_TARGET_POWERPC_MCTARGETDESC_PPCPREDICATES_H
 #define LLVM_LIB_TARGET_POWERPC_MCTARGETDESC_PPCPREDICATES_H
 
+#include "llvm/ADT/STLForwardCompat.h"
+
 // GCC #defines PPC on Linux but we use it as our namespace name
 #undef PPC
 
@@ -66,6 +68,14 @@ namespace PPC {
     BR_HINT_MASK     = 0X3
   };
 
+  inline unsigned operator&(Predicate P, BranchHintBit B) {
+    return llvm::to_underlying(P) & llvm::to_underlying(B);
+  }
+
+  inline unsigned operator&(BranchHintBit B, Predicate P) {
+    return P & B;
+  }
+
   /// Invert the specified predicate.  != -> ==, < -> >=.
   Predicate InvertPredicate(Predicate Opcode);
 
diff --git a/llvm/lib/Target/RISCV/MCTargetDesc/RISCVAsmBackend.cpp 
b/llvm/lib/Target/RISCV/MCTargetDesc/RISCVAsmBackend.cpp
index 315d129aeb5fb..9c9fb67968a7d 100644
--- a/llvm/lib/Target/RISCV/MCTargetDesc/RISCVAsmBackend.cpp
+++ b/llvm/lib/Target/RISCV/MCTargetDesc/RISCVAsmBackend.cpp
@@ -350,7 +350,7 @@ bool RISCVAsmBackend::relaxAlign(MCFragment &F, unsigned 
&Size) {
   Size = F.getAlignment().value() - MinNopLen;
   auto *Expr = MCConstantExpr::create(Size, getContext());
   MCFixup Fixup =
-      MCFixup::create(0, Expr, FirstLiteralRelocationKind + 
ELF::R_RISCV_ALIGN);
+      MCFixup::create(0, Expr, FirstLiteralRelocationKind + 
llvm::to_underlying(ELF::R_RISCV_ALIGN));
   F.setVarFixups({Fixup});
   F.setLinkerRelaxable();
   return true;
diff --git a/llvm/lib/Target/SystemZ/MCTargetDesc/SystemZMCCodeEmitter.cpp 
b/llvm/lib/Target/SystemZ/MCTargetDesc/SystemZMCCodeEmitter.cpp
index 383c96e8cca73..bd0bcabb0e239 100644
--- a/llvm/lib/Target/SystemZ/MCTargetDesc/SystemZMCCodeEmitter.cpp
+++ b/llvm/lib/Target/SystemZ/MCTargetDesc/SystemZMCCodeEmitter.cpp
@@ -172,7 +172,7 @@ uint64_t SystemZMCCodeEmitter::getImmOpValue(const MCInst 
&MI, unsigned OpNum,
     unsigned MIBitSize = MCII.get(MI.getOpcode()).getSize() * 8;
     uint32_t RawBitOffset = getOperandBitOffset(MI, OpNum, STI);
     unsigned OpBitSize =
-        SystemZ::MCFixupKindInfos[Kind - FirstTargetFixupKind].TargetSize;
+        SystemZ::MCFixupKindInfos[llvm::to_underlying(Kind) - 
FirstTargetFixupKind].TargetSize;
     uint32_t BitOffset = MIBitSize - RawBitOffset - OpBitSize;
     addFixup(Fixups, BitOffset >> 3, MO.getExpr(), Kind);
     return 0;
diff --git a/llvm/lib/Target/X86/MCTargetDesc/X86MCCodeEmitter.cpp 
b/llvm/lib/Target/X86/MCTargetDesc/X86MCCodeEmitter.cpp
index ab535c81dbf42..8f2374426b806 100644
--- a/llvm/lib/Target/X86/MCTargetDesc/X86MCCodeEmitter.cpp
+++ b/llvm/lib/Target/X86/MCTargetDesc/X86MCCodeEmitter.cpp
@@ -542,7 +542,7 @@ void X86MCCodeEmitter::emitImmediate(const MCOperand 
&DispOp, SMLoc Loc,
       assert(ImmOffset == 0);
 
       if (Size == 8) {
-        FixupKind = FirstLiteralRelocationKind + ELF::R_X86_64_GOTPC64;
+        FixupKind = FirstLiteralRelocationKind + 
llvm::to_underlying(ELF::R_X86_64_GOTPC64);
       } else {
         assert(Size == 4);
         FixupKind = X86::reloc_global_offset_table;

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