From 9e296584cebbce97cdbb6759ea8ee7ea6faababc Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu@google.com>
Date: Sat, 20 Aug 2022 00:12:35 -0700
Subject: [PATCH] Fix unused variable warnings

These warnings came up with gcc-11.3.0.
---
 lld/MachO/Driver.cpp                          | 2 +-
 lld/MachO/Writer.cpp                          | 2 +-
 mlir/include/mlir/IR/PatternMatch.h           | 1 +
 mlir/lib/Analysis/DataFlow/SparseAnalysis.cpp | 2 +-
 4 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/lld/MachO/Driver.cpp b/lld/MachO/Driver.cpp
index 931f40182c55..c2473c77c9db 100644
--- a/lld/MachO/Driver.cpp
+++ b/lld/MachO/Driver.cpp
@@ -1151,7 +1151,7 @@ static void addSynthenticMethnames() {
   llvm::raw_string_ostream os(data);
   const int prefixLength = ObjCStubsSection::symbolPrefix.size();
   for (Symbol *sym : symtab->getSymbols())
-    if (const auto *undefined = dyn_cast<Undefined>(sym))
+    if (isa<Undefined>(sym))
       if (sym->getName().startswith(ObjCStubsSection::symbolPrefix))
         os << sym->getName().drop_front(prefixLength) << '\0';
 
diff --git a/lld/MachO/Writer.cpp b/lld/MachO/Writer.cpp
index 4addaab81599..e23e592a1d98 100644
--- a/lld/MachO/Writer.cpp
+++ b/lld/MachO/Writer.cpp
@@ -695,7 +695,7 @@ void Writer::scanSymbols() {
         continue;
       dysym->getFile()->refState =
           std::max(dysym->getFile()->refState, dysym->getRefState());
-    } else if (const auto *undefined = dyn_cast<Undefined>(sym)) {
+    } else if (isa<Undefined>(sym)) {
       if (sym->getName().startswith(ObjCStubsSection::symbolPrefix))
         in.objcStubs->addEntry(sym);
     }
diff --git a/mlir/include/mlir/IR/PatternMatch.h b/mlir/include/mlir/IR/PatternMatch.h
index 7b0a3be77308..84f2e2a94c8c 100644
--- a/mlir/include/mlir/IR/PatternMatch.h
+++ b/mlir/include/mlir/IR/PatternMatch.h
@@ -1097,6 +1097,7 @@ void assertArgs(PatternRewriter &rewriter, ArrayRef<PDLValue> values,
   auto errorFn = [&](const Twine &msg) -> LogicalResult {
     llvm::report_fatal_error(msg);
   };
+  (void)errorFn;
   (assert(succeeded(
        ProcessPDLValue<typename FnTraitsT::template arg_t<I + 1>>::verifyAsArg(
            errorFn, values[I], I))),
diff --git a/mlir/lib/Analysis/DataFlow/SparseAnalysis.cpp b/mlir/lib/Analysis/DataFlow/SparseAnalysis.cpp
index ca82e32a83df..f85d8dfb279c 100644
--- a/mlir/lib/Analysis/DataFlow/SparseAnalysis.cpp
+++ b/mlir/lib/Analysis/DataFlow/SparseAnalysis.cpp
@@ -240,7 +240,7 @@ void AbstractSparseDataFlowAnalysis::visitRegionSuccessors(
 
     unsigned firstIndex = 0;
     if (inputs.size() != lattices.size()) {
-      if (auto *op = point.dyn_cast<Operation *>()) {
+      if (point.dyn_cast<Operation *>()) {
         if (!inputs.empty())
           firstIndex = inputs.front().cast<OpResult>().getResultNumber();
         visitNonControlFlowArgumentsImpl(