[clang] 14dfb38 - [Clang] -Wunused-but-set-parameter and -Wunused-but-set-variable
Arthur Eubanks via cfe-commits
cfe-commits at lists.llvm.org
Mon May 17 11:03:39 PDT 2021
Author: Michael Benfield
Date: 2021-05-17T11:02:26-07:00
New Revision: 14dfb3831c425c7f22540a2160424224008c257e
URL: https://github.com/llvm/llvm-project/commit/14dfb3831c425c7f22540a2160424224008c257e
DIFF: https://github.com/llvm/llvm-project/commit/14dfb3831c425c7f22540a2160424224008c257e.diff
LOG: [Clang] -Wunused-but-set-parameter and -Wunused-but-set-variable
These are intended to mimic warnings available in gcc.
Reviewed By: aeubanks
Differential Revision: https://reviews.llvm.org/D100581
Added:
clang/test/Sema/warn-unused-but-set-parameters.c
clang/test/Sema/warn-unused-but-set-variables.c
clang/test/SemaCXX/warn-unused-but-set-parameters-cpp.cpp
clang/test/SemaCXX/warn-unused-but-set-variables-cpp.cpp
Modified:
clang/include/clang/Basic/DiagnosticGroups.td
clang/include/clang/Basic/DiagnosticSemaKinds.td
clang/include/clang/Sema/Sema.h
clang/lib/Sema/SemaDecl.cpp
clang/lib/Sema/SemaExpr.cpp
clang/lib/Sema/SemaExprCXX.cpp
clang/test/CXX/expr/expr.prim/expr.prim.lambda/p12.cpp
clang/test/CodeGen/2007-10-30-Volatile.c
clang/test/CodeGen/X86/x86_32-xsave.c
clang/test/CodeGen/X86/x86_64-xsave.c
clang/test/CodeGen/builtins-arm.c
clang/test/CodeGen/builtins-riscv.c
clang/test/FixIt/fixit.cpp
clang/test/Misc/warning-wall.c
clang/test/Sema/shift.c
clang/test/Sema/vector-gcc-compat.c
clang/test/Sema/vector-gcc-compat.cpp
clang/test/SemaCXX/goto.cpp
clang/test/SemaCXX/shift.cpp
clang/test/SemaCXX/sizeless-1.cpp
clang/test/SemaObjC/foreach.m
Removed:
################################################################################
diff --git a/clang/include/clang/Basic/DiagnosticGroups.td b/clang/include/clang/Basic/DiagnosticGroups.td
index f6a4fbb1e04c..35088f845da4 100644
--- a/clang/include/clang/Basic/DiagnosticGroups.td
+++ b/clang/include/clang/Basic/DiagnosticGroups.td
@@ -725,6 +725,7 @@ def UnusedMemberFunction : DiagGroup<"unused-member-function",
def UnusedLabel : DiagGroup<"unused-label">;
def UnusedLambdaCapture : DiagGroup<"unused-lambda-capture">;
def UnusedParameter : DiagGroup<"unused-parameter">;
+def UnusedButSetParameter : DiagGroup<"unused-but-set-parameter">;
def UnusedResult : DiagGroup<"unused-result">;
def PotentiallyEvaluatedExpression : DiagGroup<"potentially-evaluated-expression">;
def UnevaluatedExpression : DiagGroup<"unevaluated-expression",
@@ -734,6 +735,7 @@ def UnusedValue : DiagGroup<"unused-value", [UnusedComparison, UnusedResult,
def UnusedConstVariable : DiagGroup<"unused-const-variable">;
def UnusedVariable : DiagGroup<"unused-variable",
[UnusedConstVariable]>;
+def UnusedButSetVariable : DiagGroup<"unused-but-set-variable">;
def UnusedLocalTypedef : DiagGroup<"unused-local-typedef">;
def UnusedPropertyIvar : DiagGroup<"unused-property-ivar">;
def UnusedGetterReturnValue : DiagGroup<"unused-getter-return-value">;
@@ -875,7 +877,7 @@ def Unused : DiagGroup<"unused",
// UnusedMemberFunction, (clean-up llvm before enabling)
UnusedPrivateField, UnusedLambdaCapture,
UnusedLocalTypedef, UnusedValue, UnusedVariable,
- UnusedPropertyIvar]>,
+ UnusedButSetVariable, UnusedPropertyIvar]>,
DiagCategory<"Unused Entity Issue">;
// Format settings.
@@ -927,6 +929,7 @@ def Extra : DiagGroup<"extra", [
MissingMethodReturnType,
SignCompare,
UnusedParameter,
+ UnusedButSetParameter,
NullPointerArithmetic,
EmptyInitStatement,
StringConcatation,
diff --git a/clang/include/clang/Basic/DiagnosticSemaKinds.td b/clang/include/clang/Basic/DiagnosticSemaKinds.td
index 9dd9b1b5118b..982606e4f6ca 100644
--- a/clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -310,8 +310,12 @@ def note_riscv_repeated_interrupt_attribute : Note<
"repeated RISC-V 'interrupt' attribute is here">;
def warn_unused_parameter : Warning<"unused parameter %0">,
InGroup<UnusedParameter>, DefaultIgnore;
+def warn_unused_but_set_parameter : Warning<"parameter %0 set but not used">,
+ InGroup<UnusedButSetParameter>, DefaultIgnore;
def warn_unused_variable : Warning<"unused variable %0">,
InGroup<UnusedVariable>, DefaultIgnore;
+def warn_unused_but_set_variable : Warning<"variable %0 set but not used">,
+ InGroup<UnusedButSetVariable>, DefaultIgnore;
def warn_unused_local_typedef : Warning<
"unused %select{typedef|type alias}0 %1">,
InGroup<UnusedLocalTypedef>, DefaultIgnore;
diff --git a/clang/include/clang/Sema/Sema.h b/clang/include/clang/Sema/Sema.h
index b6143d1d3178..160760577c5b 100644
--- a/clang/include/clang/Sema/Sema.h
+++ b/clang/include/clang/Sema/Sema.h
@@ -1514,6 +1514,11 @@ class Sema final {
bool WarnedStackExhausted = false;
+ /// Increment when we find a reference; decrement when we find an ignored
+ /// assignment. Ultimately the value is 0 if every reference is an ignored
+ /// assignment.
+ llvm::DenseMap<const VarDecl *, int> RefsMinusAssignments;
+
public:
Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer,
TranslationUnitKind TUKind = TU_Complete,
@@ -4858,6 +4863,10 @@ class Sema final {
void DiagnoseUnusedNestedTypedefs(const RecordDecl *D);
void DiagnoseUnusedDecl(const NamedDecl *ND);
+ /// If VD is set but not otherwise used, diagnose, for a parameter or a
+ /// variable.
+ void DiagnoseUnusedButSetDecl(const VarDecl *VD);
+
/// Emit \p DiagID if statement located on \p StmtLoc has a suspicious null
/// statement as a \p Body, and it is located on the same line.
///
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index db267089be96..9f5be890ca21 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -1906,6 +1906,37 @@ void Sema::DiagnoseUnusedDecl(const NamedDecl *D) {
Diag(D->getLocation(), DiagID) << D << Hint;
}
+void Sema::DiagnoseUnusedButSetDecl(const VarDecl *VD) {
+ // If it's not referenced, it can't be set.
+ if (!VD->isReferenced() || !VD->getDeclName() || VD->hasAttr<UnusedAttr>())
+ return;
+
+ const auto *Ty = VD->getType().getTypePtr()->getBaseElementTypeUnsafe();
+ if (const TagType *TT = Ty->getAs<TagType>()) {
+ const TagDecl *Tag = TT->getDecl();
+ if (Tag->hasAttr<UnusedAttr>())
+ return;
+ // In C++, don't warn for record types that don't have WarnUnusedAttr, to
+ // mimic gcc's behavior.
+ if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) {
+ if (!RD->hasAttr<WarnUnusedAttr>())
+ return;
+ }
+ }
+
+ auto iter = RefsMinusAssignments.find(VD);
+ if (iter == RefsMinusAssignments.end())
+ return;
+
+ assert(iter->getSecond() >= 0 &&
+ "Found a negative number of references to a VarDecl");
+ if (iter->getSecond() != 0)
+ return;
+ unsigned DiagID = isa<ParmVarDecl>(VD) ? diag::warn_unused_but_set_parameter
+ : diag::warn_unused_but_set_variable;
+ Diag(VD->getLocation(), DiagID) << VD;
+}
+
static void CheckPoppedLabel(LabelDecl *L, Sema &S) {
// Verify that we have no forward references left. If so, there was a goto
// or address of a label taken, but no definition of it. Label fwd
@@ -1940,6 +1971,11 @@ void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) {
DiagnoseUnusedNestedTypedefs(RD);
}
+ if (VarDecl *VD = dyn_cast<VarDecl>(D)) {
+ DiagnoseUnusedButSetDecl(VD);
+ RefsMinusAssignments.erase(VD);
+ }
+
if (!D->getDeclName()) continue;
// If this was a forward reference to a label, verify it was defined.
diff --git a/clang/lib/Sema/SemaExpr.cpp b/clang/lib/Sema/SemaExpr.cpp
index 51df75707145..431b37e6da94 100644
--- a/clang/lib/Sema/SemaExpr.cpp
+++ b/clang/lib/Sema/SemaExpr.cpp
@@ -18322,8 +18322,9 @@ void Sema::CleanupVarDeclMarking() {
"MarkVarDeclODRUsed failed to cleanup MaybeODRUseExprs?");
}
-static void DoMarkVarDeclReferenced(Sema &SemaRef, SourceLocation Loc,
- VarDecl *Var, Expr *E) {
+static void DoMarkVarDeclReferenced(
+ Sema &SemaRef, SourceLocation Loc, VarDecl *Var, Expr *E,
+ llvm::DenseMap<const VarDecl *, int> &RefsMinusAssignments) {
assert((!E || isa<DeclRefExpr>(E) || isa<MemberExpr>(E) ||
isa<FunctionParmPackExpr>(E)) &&
"Invalid Expr argument to DoMarkVarDeclReferenced");
@@ -18340,6 +18341,10 @@ static void DoMarkVarDeclReferenced(Sema &SemaRef, SourceLocation Loc,
bool UsableInConstantExpr =
Var->mightBeUsableInConstantExpressions(SemaRef.Context);
+ if (Var->isLocalVarDeclOrParm() && !Var->hasExternalStorage()) {
+ RefsMinusAssignments.insert({Var, 0}).first->getSecond()++;
+ }
+
// C++20 [expr.const]p12:
// A variable [...] is needed for constant evaluation if it is [...] a
// variable whose name appears as a potentially constant evaluated
@@ -18495,16 +18500,18 @@ static void DoMarkVarDeclReferenced(Sema &SemaRef, SourceLocation Loc,
/// (C++ [basic.def.odr]p2, C99 6.9p3). Note that this should not be
/// used directly for normal expressions referring to VarDecl.
void Sema::MarkVariableReferenced(SourceLocation Loc, VarDecl *Var) {
- DoMarkVarDeclReferenced(*this, Loc, Var, nullptr);
+ DoMarkVarDeclReferenced(*this, Loc, Var, nullptr, RefsMinusAssignments);
}
-static void MarkExprReferenced(Sema &SemaRef, SourceLocation Loc,
- Decl *D, Expr *E, bool MightBeOdrUse) {
+static void
+MarkExprReferenced(Sema &SemaRef, SourceLocation Loc, Decl *D, Expr *E,
+ bool MightBeOdrUse,
+ llvm::DenseMap<const VarDecl *, int> &RefsMinusAssignments) {
if (SemaRef.isInOpenMPDeclareTargetContext())
SemaRef.checkDeclIsAllowedInOpenMPTarget(E, D);
if (VarDecl *Var = dyn_cast<VarDecl>(D)) {
- DoMarkVarDeclReferenced(SemaRef, Loc, Var, E);
+ DoMarkVarDeclReferenced(SemaRef, Loc, Var, E, RefsMinusAssignments);
return;
}
@@ -18550,7 +18557,8 @@ void Sema::MarkDeclRefReferenced(DeclRefExpr *E, const Expr *Base) {
if (!isConstantEvaluated() && FD->isConsteval() &&
!RebuildingImmediateInvocation)
ExprEvalContexts.back().ReferenceToConsteval.insert(E);
- MarkExprReferenced(*this, E->getLocation(), E->getDecl(), E, OdrUse);
+ MarkExprReferenced(*this, E->getLocation(), E->getDecl(), E, OdrUse,
+ RefsMinusAssignments);
}
/// Perform reference-marking and odr-use handling for a MemberExpr.
@@ -18569,13 +18577,15 @@ void Sema::MarkMemberReferenced(MemberExpr *E) {
}
SourceLocation Loc =
E->getMemberLoc().isValid() ? E->getMemberLoc() : E->getBeginLoc();
- MarkExprReferenced(*this, Loc, E->getMemberDecl(), E, MightBeOdrUse);
+ MarkExprReferenced(*this, Loc, E->getMemberDecl(), E, MightBeOdrUse,
+ RefsMinusAssignments);
}
/// Perform reference-marking and odr-use handling for a FunctionParmPackExpr.
void Sema::MarkFunctionParmPackReferenced(FunctionParmPackExpr *E) {
for (VarDecl *VD : *E)
- MarkExprReferenced(*this, E->getParameterPackLocation(), VD, E, true);
+ MarkExprReferenced(*this, E->getParameterPackLocation(), VD, E, true,
+ RefsMinusAssignments);
}
/// Perform marking for a reference to an arbitrary declaration. It
diff --git a/clang/lib/Sema/SemaExprCXX.cpp b/clang/lib/Sema/SemaExprCXX.cpp
index b31c484b1170..b44e8cf2e7a0 100644
--- a/clang/lib/Sema/SemaExprCXX.cpp
+++ b/clang/lib/Sema/SemaExprCXX.cpp
@@ -7782,9 +7782,34 @@ ExprResult Sema::ActOnNoexceptExpr(SourceLocation KeyLoc, SourceLocation,
return BuildCXXNoexceptExpr(KeyLoc, Operand, RParen);
}
+static void MaybeDecrementCount(
+ Expr *E, llvm::DenseMap<const VarDecl *, int> &RefsMinusAssignments) {
+ DeclRefExpr *LHS = nullptr;
+ if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
+ if (!BO->isAssignmentOp())
+ return;
+ LHS = dyn_cast<DeclRefExpr>(BO->getLHS());
+ } else if (CXXOperatorCallExpr *COCE = dyn_cast<CXXOperatorCallExpr>(E)) {
+ if (!COCE->isAssignmentOp())
+ return;
+ LHS = dyn_cast<DeclRefExpr>(COCE->getArg(0));
+ }
+ if (!LHS)
+ return;
+ VarDecl *VD = dyn_cast<VarDecl>(LHS->getDecl());
+ if (!VD)
+ return;
+ auto iter = RefsMinusAssignments.find(VD);
+ if (iter == RefsMinusAssignments.end())
+ return;
+ iter->getSecond()--;
+}
+
/// Perform the conversions required for an expression used in a
/// context that ignores the result.
ExprResult Sema::IgnoredValueConversions(Expr *E) {
+ MaybeDecrementCount(E, RefsMinusAssignments);
+
if (E->hasPlaceholderType()) {
ExprResult result = CheckPlaceholderExpr(E);
if (result.isInvalid()) return E;
diff --git a/clang/test/CXX/expr/expr.prim/expr.prim.lambda/p12.cpp b/clang/test/CXX/expr/expr.prim/expr.prim.lambda/p12.cpp
index b69bc939c39d..8bc9a1d91cd2 100644
--- a/clang/test/CXX/expr/expr.prim/expr.prim.lambda/p12.cpp
+++ b/clang/test/CXX/expr/expr.prim/expr.prim.lambda/p12.cpp
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -std=c++11 %s -Wunused -Wno-unused-lambda-capture -verify
+// RUN: %clang_cc1 -std=c++11 %s -Wunused -Wno-unused-but-set-variable -Wno-unused-lambda-capture -verify
void odr_used() {
int i = 17;
diff --git a/clang/test/CodeGen/2007-10-30-Volatile.c b/clang/test/CodeGen/2007-10-30-Volatile.c
index 17aac1a987c2..96df76c039e0 100644
--- a/clang/test/CodeGen/2007-10-30-Volatile.c
+++ b/clang/test/CodeGen/2007-10-30-Volatile.c
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -emit-llvm %s -o /dev/null -Wall -Werror
+// RUN: %clang_cc1 -emit-llvm %s -o /dev/null -Wall -Wno-unused-but-set-variable -Werror
void bork() {
char * volatile p = 0;
volatile int cc = 0;
diff --git a/clang/test/CodeGen/X86/x86_32-xsave.c b/clang/test/CodeGen/X86/x86_32-xsave.c
index e1acdff12407..35cd273ffb83 100644
--- a/clang/test/CodeGen/X86/x86_32-xsave.c
+++ b/clang/test/CodeGen/X86/x86_32-xsave.c
@@ -1,17 +1,17 @@
-// RUN: %clang_cc1 %s -DTEST_XSAVE -O0 -triple=i686-unknown-unknown -target-feature +xsave -emit-llvm -o - -Wall -Werror | FileCheck %s --check-prefix=XSAVE
-// RUN: %clang_cc1 %s -DTEST_XSAVE -O0 -triple=i686-unknown-unknown -target-feature +xsave -fno-signed-char -emit-llvm -o - -Wall -Werror | FileCheck %s --check-prefix=XSAVE
+// RUN: %clang_cc1 %s -DTEST_XSAVE -O0 -triple=i686-unknown-unknown -target-feature +xsave -emit-llvm -o - -Wall -Wno-unused-but-set-variable -Werror | FileCheck %s --check-prefix=XSAVE
+// RUN: %clang_cc1 %s -DTEST_XSAVE -O0 -triple=i686-unknown-unknown -target-feature +xsave -fno-signed-char -emit-llvm -o - -Wall -Wno-unused-but-set-variable -Werror | FileCheck %s --check-prefix=XSAVE
-// RUN: %clang_cc1 %s -DTEST_XGETBV -O0 -triple=i686-unknown-unknown -target-feature +xsave -emit-llvm -o - -Wall -Werror | FileCheck %s --check-prefix=XGETBV
-// RUN: %clang_cc1 %s -DTEST_XSETBV -O0 -triple=i686-unknown-unknown -target-feature +xsave -emit-llvm -o - -Wall -Werror | FileCheck %s --check-prefix=XSETBV
+// RUN: %clang_cc1 %s -DTEST_XGETBV -O0 -triple=i686-unknown-unknown -target-feature +xsave -emit-llvm -o - -Wall -Wno-unused-but-set-variable -Werror | FileCheck %s --check-prefix=XGETBV
+// RUN: %clang_cc1 %s -DTEST_XSETBV -O0 -triple=i686-unknown-unknown -target-feature +xsave -emit-llvm -o - -Wall -Wno-unused-but-set-variable -Werror | FileCheck %s --check-prefix=XSETBV
-// RUN: %clang_cc1 %s -DTEST_XSAVEOPT -O0 -triple=i686-unknown-unknown -target-feature +xsave -target-feature +xsaveopt -emit-llvm -o - -Wall -Werror | FileCheck %s --check-prefix=XSAVEOPT
-// RUN: %clang_cc1 %s -DTEST_XSAVEOPT -O0 -triple=i686-unknown-unknown -target-feature +xsave -target-feature +xsaveopt -fno-signed-char -emit-llvm -o - -Wall -Werror | FileCheck %s --check-prefix=XSAVEOPT
+// RUN: %clang_cc1 %s -DTEST_XSAVEOPT -O0 -triple=i686-unknown-unknown -target-feature +xsave -target-feature +xsaveopt -emit-llvm -o - -Wall -Wno-unused-but-set-variable -Werror | FileCheck %s --check-prefix=XSAVEOPT
+// RUN: %clang_cc1 %s -DTEST_XSAVEOPT -O0 -triple=i686-unknown-unknown -target-feature +xsave -target-feature +xsaveopt -fno-signed-char -emit-llvm -o - -Wall -Wno-unused-but-set-variable -Werror | FileCheck %s --check-prefix=XSAVEOPT
-// RUN: %clang_cc1 %s -DTEST_XSAVEC -O0 -triple=i686-unknown-unknown -target-feature +xsave -target-feature +xsavec -emit-llvm -o - -Wall -Werror | FileCheck %s --check-prefix=XSAVEC
-// RUN: %clang_cc1 %s -DTEST_XSAVEC -O0 -triple=i686-unknown-unknown -target-feature +xsave -target-feature +xsavec -fno-signed-char -emit-llvm -o - -Wall -Werror | FileCheck %s --check-prefix=XSAVEC
+// RUN: %clang_cc1 %s -DTEST_XSAVEC -O0 -triple=i686-unknown-unknown -target-feature +xsave -target-feature +xsavec -emit-llvm -o - -Wall -Wno-unused-but-set-variable -Werror | FileCheck %s --check-prefix=XSAVEC
+// RUN: %clang_cc1 %s -DTEST_XSAVEC -O0 -triple=i686-unknown-unknown -target-feature +xsave -target-feature +xsavec -fno-signed-char -emit-llvm -o - -Wall -Wno-unused-but-set-variable -Werror | FileCheck %s --check-prefix=XSAVEC
-// RUN: %clang_cc1 %s -DTEST_XSAVES -O0 -triple=i686-unknown-unknown -target-feature +xsave -target-feature +xsaves -emit-llvm -o - -Wall -Werror | FileCheck %s --check-prefix=XSAVES
-// RUN: %clang_cc1 %s -DTEST_XSAVES -O0 -triple=i686-unknown-unknown -target-feature +xsave -target-feature +xsaves -fno-signed-char -emit-llvm -o - -Wall -Werror | FileCheck %s --check-prefix=XSAVES
+// RUN: %clang_cc1 %s -DTEST_XSAVES -O0 -triple=i686-unknown-unknown -target-feature +xsave -target-feature +xsaves -emit-llvm -o - -Wall -Wno-unused-but-set-variable -Werror | FileCheck %s --check-prefix=XSAVES
+// RUN: %clang_cc1 %s -DTEST_XSAVES -O0 -triple=i686-unknown-unknown -target-feature +xsave -target-feature +xsaves -fno-signed-char -emit-llvm -o - -Wall -Wno-unused-but-set-variable -Werror | FileCheck %s --check-prefix=XSAVES
// Don't include mm_malloc.h, it's system specific.
#define __MM_MALLOC_H
diff --git a/clang/test/CodeGen/X86/x86_64-xsave.c b/clang/test/CodeGen/X86/x86_64-xsave.c
index cfc33cb06721..33be2cceb453 100644
--- a/clang/test/CodeGen/X86/x86_64-xsave.c
+++ b/clang/test/CodeGen/X86/x86_64-xsave.c
@@ -1,17 +1,17 @@
-// RUN: %clang_cc1 %s -DTEST_XSAVE -O0 -triple=x86_64-unknown-unknown -target-feature +xsave -emit-llvm -o - -Wall -Werror | FileCheck %s --check-prefix=XSAVE
-// RUN: %clang_cc1 %s -DTEST_XSAVE -O0 -triple=x86_64-unknown-unknown -target-feature +xsave -fno-signed-char -emit-llvm -o - -Wall -Werror | FileCheck %s --check-prefix=XSAVE
+// RUN: %clang_cc1 %s -DTEST_XSAVE -O0 -triple=x86_64-unknown-unknown -target-feature +xsave -emit-llvm -o - -Wall -Wno-unused-but-set-variable -Werror | FileCheck %s --check-prefix=XSAVE
+// RUN: %clang_cc1 %s -DTEST_XSAVE -O0 -triple=x86_64-unknown-unknown -target-feature +xsave -fno-signed-char -emit-llvm -o - -Wall -Wno-unused-but-set-variable -Werror | FileCheck %s --check-prefix=XSAVE
-// RUN: %clang_cc1 %s -DTEST_XGETBV -O0 -triple=x86_64-unknown-unknown -target-feature +xsave -emit-llvm -o - -Wall -Werror | FileCheck %s --check-prefix=XGETBV
-// RUN: %clang_cc1 %s -DTEST_XSETBV -O0 -triple=x86_64-unknown-unknown -target-feature +xsave -fno-signed-char -emit-llvm -o - -Wall -Werror | FileCheck %s --check-prefix=XSETBV
+// RUN: %clang_cc1 %s -DTEST_XGETBV -O0 -triple=x86_64-unknown-unknown -target-feature +xsave -emit-llvm -o - -Wall -Wno-unused-but-set-variable -Werror | FileCheck %s --check-prefix=XGETBV
+// RUN: %clang_cc1 %s -DTEST_XSETBV -O0 -triple=x86_64-unknown-unknown -target-feature +xsave -fno-signed-char -emit-llvm -o - -Wall -Wno-unused-but-set-variable -Werror | FileCheck %s --check-prefix=XSETBV
-// RUN: %clang_cc1 %s -DTEST_XSAVEOPT -O0 -triple=x86_64-unknown-unknown -target-feature +xsave -target-feature +xsaveopt -emit-llvm -o - -Wall -Werror | FileCheck %s --check-prefix=XSAVEOPT
-// RUN: %clang_cc1 %s -DTEST_XSAVEOPT -O0 -triple=x86_64-unknown-unknown -target-feature +xsave -target-feature +xsaveopt -fno-signed-char -emit-llvm -o - -Wall -Werror | FileCheck %s --check-prefix=XSAVEOPT
+// RUN: %clang_cc1 %s -DTEST_XSAVEOPT -O0 -triple=x86_64-unknown-unknown -target-feature +xsave -target-feature +xsaveopt -emit-llvm -o - -Wall -Wno-unused-but-set-variable -Werror | FileCheck %s --check-prefix=XSAVEOPT
+// RUN: %clang_cc1 %s -DTEST_XSAVEOPT -O0 -triple=x86_64-unknown-unknown -target-feature +xsave -target-feature +xsaveopt -fno-signed-char -emit-llvm -o - -Wall -Wno-unused-but-set-variable -Werror | FileCheck %s --check-prefix=XSAVEOPT
-// RUN: %clang_cc1 %s -DTEST_XSAVEC -O0 -triple=x86_64-unknown-unknown -target-feature +xsave -target-feature +xsavec -emit-llvm -o - -Wall -Werror | FileCheck %s --check-prefix=XSAVEC
-// RUN: %clang_cc1 %s -DTEST_XSAVEC -O0 -triple=x86_64-unknown-unknown -target-feature +xsave -target-feature +xsavec -fno-signed-char -emit-llvm -o - -Wall -Werror | FileCheck %s --check-prefix=XSAVEC
+// RUN: %clang_cc1 %s -DTEST_XSAVEC -O0 -triple=x86_64-unknown-unknown -target-feature +xsave -target-feature +xsavec -emit-llvm -o - -Wall -Wno-unused-but-set-variable -Werror | FileCheck %s --check-prefix=XSAVEC
+// RUN: %clang_cc1 %s -DTEST_XSAVEC -O0 -triple=x86_64-unknown-unknown -target-feature +xsave -target-feature +xsavec -fno-signed-char -emit-llvm -o - -Wall -Wno-unused-but-set-variable -Werror | FileCheck %s --check-prefix=XSAVEC
-// RUN: %clang_cc1 %s -DTEST_XSAVES -O0 -triple=x86_64-unknown-unknown -target-feature +xsave -target-feature +xsaves -emit-llvm -o - -Wall -Werror | FileCheck %s --check-prefix=XSAVES
-// RUN: %clang_cc1 %s -DTEST_XSAVES -O0 -triple=x86_64-unknown-unknown -target-feature +xsave -target-feature +xsaves -fno-signed-char -emit-llvm -o - -Wall -Werror | FileCheck %s --check-prefix=XSAVES
+// RUN: %clang_cc1 %s -DTEST_XSAVES -O0 -triple=x86_64-unknown-unknown -target-feature +xsave -target-feature +xsaves -emit-llvm -o - -Wall -Wno-unused-but-set-variable -Werror | FileCheck %s --check-prefix=XSAVES
+// RUN: %clang_cc1 %s -DTEST_XSAVES -O0 -triple=x86_64-unknown-unknown -target-feature +xsave -target-feature +xsaves -fno-signed-char -emit-llvm -o - -Wall -Wno-unused-but-set-variable -Werror | FileCheck %s --check-prefix=XSAVES
// Don't include mm_malloc.h, it's system specific.
#define __MM_MALLOC_H
diff --git a/clang/test/CodeGen/builtins-arm.c b/clang/test/CodeGen/builtins-arm.c
index 8c251754e46c..1acd55d46158 100644
--- a/clang/test/CodeGen/builtins-arm.c
+++ b/clang/test/CodeGen/builtins-arm.c
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -Wall -Werror -triple thumbv7-eabi -target-cpu cortex-a8 -disable-O0-optnone -emit-llvm -o - %s | opt -S -mem2reg | FileCheck %s
+// RUN: %clang_cc1 -Wall -Wno-unused-but-set-variable -Werror -triple thumbv7-eabi -target-cpu cortex-a8 -disable-O0-optnone -emit-llvm -o - %s | opt -S -mem2reg | FileCheck %s
#include <stdint.h>
diff --git a/clang/test/CodeGen/builtins-riscv.c b/clang/test/CodeGen/builtins-riscv.c
index 5297c42ae4e9..31fb572cb274 100644
--- a/clang/test/CodeGen/builtins-riscv.c
+++ b/clang/test/CodeGen/builtins-riscv.c
@@ -1,5 +1,5 @@
-// RUN: %clang_cc1 -Wall -Werror -triple riscv32 -disable-O0-optnone -emit-llvm -o - %s | opt -S -mem2reg | FileCheck %s
-// RUN: %clang_cc1 -Wall -Werror -triple riscv64 -disable-O0-optnone -emit-llvm -o - %s | opt -S -mem2reg | FileCheck %s
+// RUN: %clang_cc1 -Wall -Wno-unused-but-set-variable -Werror -triple riscv32 -disable-O0-optnone -emit-llvm -o - %s | opt -S -mem2reg | FileCheck %s
+// RUN: %clang_cc1 -Wall -Wno-unused-but-set-variable -Werror -triple riscv64 -disable-O0-optnone -emit-llvm -o - %s | opt -S -mem2reg | FileCheck %s
void test_eh_return_data_regno() {
// CHECK: store volatile i32 10
diff --git a/clang/test/FixIt/fixit.cpp b/clang/test/FixIt/fixit.cpp
index 6e3a41303af9..bfff20e76c14 100644
--- a/clang/test/FixIt/fixit.cpp
+++ b/clang/test/FixIt/fixit.cpp
@@ -1,12 +1,12 @@
-// RUN: %clang_cc1 -pedantic -Wall -Wno-comment -verify -fcxx-exceptions -x c++ -std=c++98 %s
+// RUN: %clang_cc1 -pedantic -Wall -Wno-unused-but-set-variable -Wno-comment -verify -fcxx-exceptions -x c++ -std=c++98 %s
// RUN: cp %s %t-98
-// RUN: not %clang_cc1 -pedantic -Wall -Wno-comment -fcxx-exceptions -fixit -x c++ -std=c++98 %t-98
-// RUN: %clang_cc1 -fsyntax-only -pedantic -Wall -Werror -Wno-comment -fcxx-exceptions -x c++ -std=c++98 %t-98
+// RUN: not %clang_cc1 -pedantic -Wall -Wno-unused-but-set-variable -Wno-comment -fcxx-exceptions -fixit -x c++ -std=c++98 %t-98
+// RUN: %clang_cc1 -fsyntax-only -pedantic -Wall -Wno-unused-but-set-variable -Werror -Wno-comment -fcxx-exceptions -x c++ -std=c++98 %t-98
// RUN: not %clang_cc1 -fsyntax-only -pedantic -fdiagnostics-parseable-fixits -x c++ -std=c++11 %s 2>&1 | FileCheck %s
-// RUN: %clang_cc1 -pedantic -Wall -Wno-comment -verify -fcxx-exceptions -x c++ -std=c++11 %s
+// RUN: %clang_cc1 -pedantic -Wall -Wno-unused-but-set-variable -Wno-comment -verify -fcxx-exceptions -x c++ -std=c++11 %s
// RUN: cp %s %t-11
-// RUN: not %clang_cc1 -pedantic -Wall -Wno-comment -fcxx-exceptions -fixit -x c++ -std=c++11 %t-11
-// RUN: %clang_cc1 -fsyntax-only -pedantic -Wall -Werror -Wno-comment -fcxx-exceptions -x c++ -std=c++11 %t-11
+// RUN: not %clang_cc1 -pedantic -Wall -Wno-unused-but-set-variable -Wno-comment -fcxx-exceptions -fixit -x c++ -std=c++11 %t-11
+// RUN: %clang_cc1 -fsyntax-only -pedantic -Wall -Wno-unused-but-set-variable -Werror -Wno-comment -fcxx-exceptions -x c++ -std=c++11 %t-11
/* This is a test of the various code modification hints that are
provided as part of warning or extension diagnostics. All of the
diff --git a/clang/test/Misc/warning-wall.c b/clang/test/Misc/warning-wall.c
index ac2b124e3312..ee3a63e7bbd4 100644
--- a/clang/test/Misc/warning-wall.c
+++ b/clang/test/Misc/warning-wall.c
@@ -73,6 +73,7 @@ CHECK-NEXT: -Wunevaluated-expression
CHECK-NEXT: -Wpotentially-evaluated-expression
CHECK-NEXT: -Wunused-variable
CHECK-NEXT: -Wunused-const-variable
+CHECK-NEXT: -Wunused-but-set-variable
CHECK-NEXT: -Wunused-property-ivar
CHECK-NEXT: -Wvolatile-register-var
CHECK-NEXT: -Wobjc-missing-super-calls
diff --git a/clang/test/Sema/shift.c b/clang/test/Sema/shift.c
index 63c953824925..34487e1156ac 100644
--- a/clang/test/Sema/shift.c
+++ b/clang/test/Sema/shift.c
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -Wall -Wshift-sign-overflow -ffreestanding -fsyntax-only -verify %s
+// RUN: %clang_cc1 -Wall -Wno-unused-but-set-variable -Wshift-sign-overflow -ffreestanding -fsyntax-only -verify %s
#include <limits.h>
diff --git a/clang/test/Sema/vector-gcc-compat.c b/clang/test/Sema/vector-gcc-compat.c
index 73b56347f1b1..78132f7f0963 100644
--- a/clang/test/Sema/vector-gcc-compat.c
+++ b/clang/test/Sema/vector-gcc-compat.c
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 %s -verify -fsyntax-only -Weverything -triple x86_64-apple-darwin10
+// RUN: %clang_cc1 %s -verify -fsyntax-only -Weverything -Wno-unused-but-set-variable -triple x86_64-apple-darwin10
// Test the compatibility of clang's vector extensions with gcc's vector
// extensions for C. Notably &&, ||, ?: and ! are not available.
diff --git a/clang/test/Sema/vector-gcc-compat.cpp b/clang/test/Sema/vector-gcc-compat.cpp
index cb6547696814..42c24d91ea8f 100644
--- a/clang/test/Sema/vector-gcc-compat.cpp
+++ b/clang/test/Sema/vector-gcc-compat.cpp
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 %s -verify -fsyntax-only -Weverything -std=c++11 -triple x86_64-apple-darwin10
+// RUN: %clang_cc1 %s -verify -fsyntax-only -Weverything -Wno-unused-but-set-variable -std=c++11 -triple x86_64-apple-darwin10
// Test the compatibility of clang++'s vector extensions with g++'s vector
// extensions. In comparison to the extensions available in C, the !, ?:, && and
diff --git a/clang/test/Sema/warn-unused-but-set-parameters.c b/clang/test/Sema/warn-unused-but-set-parameters.c
new file mode 100644
index 000000000000..4da4822090f3
--- /dev/null
+++ b/clang/test/Sema/warn-unused-but-set-parameters.c
@@ -0,0 +1,26 @@
+// RUN: %clang_cc1 -fblocks -fsyntax-only -Wunused-but-set-parameter -verify %s
+
+int f0(int x,
+ int y, // expected-warning{{parameter 'y' set but not used}}
+ int z __attribute__((unused))) {
+ y = 0;
+ return x;
+}
+
+void f1(void) {
+ (void)^(int x,
+ int y, // expected-warning{{parameter 'y' set but not used}}
+ int z __attribute__((unused))) {
+ y = 0;
+ return x;
+ };
+}
+
+struct S {
+ int i;
+};
+
+void f3(struct S s) { // expected-warning{{parameter 's' set but not used}}
+ struct S t;
+ s = t;
+}
diff --git a/clang/test/Sema/warn-unused-but-set-variables.c b/clang/test/Sema/warn-unused-but-set-variables.c
new file mode 100644
index 000000000000..93595a251df0
--- /dev/null
+++ b/clang/test/Sema/warn-unused-but-set-variables.c
@@ -0,0 +1,47 @@
+// RUN: %clang_cc1 -fblocks -fsyntax-only -Wunused-but-set-variable -verify %s
+
+struct S {
+ int i;
+};
+
+int f0() {
+ int y; // expected-warning{{variable 'y' set but not used}}
+ y = 0;
+
+ int z __attribute__((unused));
+ z = 0;
+
+ struct S s; // expected-warning{{variable 's' set but not used}}
+ struct S t;
+ s = t;
+
+ // Don't warn for an extern variable.
+ extern int w;
+ w = 0;
+
+ // Following gcc, this should not warn.
+ int a;
+ w = (a = 0);
+
+ int x;
+ x = 0;
+ return x;
+}
+
+void f1(void) {
+ (void)^() {
+ int y; // expected-warning{{variable 'y' set but not used}}
+ y = 0;
+
+ int x;
+ x = 0;
+ return x;
+ };
+}
+
+void f2 (void) {
+ // Don't warn, even if it's only used in a non-ODR context.
+ int x;
+ x = 0;
+ (void) sizeof(x);
+}
diff --git a/clang/test/SemaCXX/goto.cpp b/clang/test/SemaCXX/goto.cpp
index beaf88cf60f1..b80305fefa4f 100644
--- a/clang/test/SemaCXX/goto.cpp
+++ b/clang/test/SemaCXX/goto.cpp
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -fsyntax-only -verify -Wall -fblocks %s
+// RUN: %clang_cc1 -fsyntax-only -verify -Wall -Wno-unused-but-set-variable -fblocks %s
// PR9463
double *end;
diff --git a/clang/test/SemaCXX/shift.cpp b/clang/test/SemaCXX/shift.cpp
index f99b53e358ac..144c18849050 100644
--- a/clang/test/SemaCXX/shift.cpp
+++ b/clang/test/SemaCXX/shift.cpp
@@ -1,5 +1,5 @@
-// RUN: %clang_cc1 -Wall -Wshift-sign-overflow -ffreestanding -fsyntax-only -verify=expected,cxx17 -std=c++17 %s
-// RUN: %clang_cc1 -Wall -Wshift-sign-overflow -ffreestanding -fsyntax-only -verify=expected,cxx2a -std=c++2a %s
+// RUN: %clang_cc1 -Wall -Wno-unused-but-set-variable -Wshift-sign-overflow -ffreestanding -fsyntax-only -verify=expected,cxx17 -std=c++17 %s
+// RUN: %clang_cc1 -Wall -Wno-unused-but-set-variable -Wshift-sign-overflow -ffreestanding -fsyntax-only -verify=expected,cxx2a -std=c++2a %s
#include <limits.h>
diff --git a/clang/test/SemaCXX/sizeless-1.cpp b/clang/test/SemaCXX/sizeless-1.cpp
index 96a3ce7542a7..cf92dffbd170 100644
--- a/clang/test/SemaCXX/sizeless-1.cpp
+++ b/clang/test/SemaCXX/sizeless-1.cpp
@@ -1,7 +1,7 @@
-// RUN: %clang_cc1 -fcxx-exceptions -fsyntax-only -verify -W -Wall -Wrange-loop-analysis -triple arm64-linux-gnu -target-feature +sve -std=c++98 %s
-// RUN: %clang_cc1 -fcxx-exceptions -fsyntax-only -verify -W -Wall -Wrange-loop-analysis -triple arm64-linux-gnu -target-feature +sve -std=c++11 %s
-// RUN: %clang_cc1 -fcxx-exceptions -fsyntax-only -verify -W -Wall -Wrange-loop-analysis -triple arm64-linux-gnu -target-feature +sve -std=c++17 %s
-// RUN: %clang_cc1 -fcxx-exceptions -fsyntax-only -verify -W -Wall -Wrange-loop-analysis -triple arm64-linux-gnu -target-feature +sve -std=gnu++17 %s
+// RUN: %clang_cc1 -fcxx-exceptions -fsyntax-only -verify -W -Wall -Wno-unused-but-set-variable -Wrange-loop-analysis -triple arm64-linux-gnu -target-feature +sve -std=c++98 %s
+// RUN: %clang_cc1 -fcxx-exceptions -fsyntax-only -verify -W -Wall -Wno-unused-but-set-variable -Wrange-loop-analysis -triple arm64-linux-gnu -target-feature +sve -std=c++11 %s
+// RUN: %clang_cc1 -fcxx-exceptions -fsyntax-only -verify -W -Wall -Wno-unused-but-set-variable -Wrange-loop-analysis -triple arm64-linux-gnu -target-feature +sve -std=c++17 %s
+// RUN: %clang_cc1 -fcxx-exceptions -fsyntax-only -verify -W -Wall -Wno-unused-but-set-variable -Wrange-loop-analysis -triple arm64-linux-gnu -target-feature +sve -std=gnu++17 %s
namespace std {
struct type_info;
diff --git a/clang/test/SemaCXX/warn-unused-but-set-parameters-cpp.cpp b/clang/test/SemaCXX/warn-unused-but-set-parameters-cpp.cpp
new file mode 100644
index 000000000000..355ddd3ac7ad
--- /dev/null
+++ b/clang/test/SemaCXX/warn-unused-but-set-parameters-cpp.cpp
@@ -0,0 +1,33 @@
+// RUN: %clang_cc1 -fblocks -fsyntax-only -Wunused-but-set-parameter -verify %s
+
+int f0(int x,
+ int y, // expected-warning{{parameter 'y' set but not used}}
+ int z __attribute__((unused))) {
+ y = 0;
+ return x;
+}
+
+void f1(void) {
+ (void)^(int x,
+ int y, // expected-warning{{parameter 'y' set but not used}}
+ int z __attribute__((unused))) {
+ y = 0;
+ return x;
+ };
+}
+
+struct S {
+ int i;
+};
+
+// In C++, don't warn for a struct (following gcc).
+void f3(struct S s) {
+ struct S t;
+ s = t;
+}
+
+// Make sure this doesn't warn.
+struct A {
+ int i;
+ A(int j) : i(j) {}
+};
diff --git a/clang/test/SemaCXX/warn-unused-but-set-variables-cpp.cpp b/clang/test/SemaCXX/warn-unused-but-set-variables-cpp.cpp
new file mode 100644
index 000000000000..aa598408dee5
--- /dev/null
+++ b/clang/test/SemaCXX/warn-unused-but-set-variables-cpp.cpp
@@ -0,0 +1,50 @@
+// RUN: %clang_cc1 -fblocks -fsyntax-only -Wunused-but-set-variable -verify %s
+
+struct S {
+ int i;
+};
+
+struct __attribute__((warn_unused)) SWarnUnused {
+ int j;
+};
+
+int f0() {
+ int y; // expected-warning{{variable 'y' set but not used}}
+ y = 0;
+
+ int z __attribute__((unused));
+ z = 0;
+
+ // In C++, don't warn for structs. (following gcc's behavior)
+ struct S s;
+ struct S t;
+ s = t;
+
+ // Unless it's marked with the warn_unused attribute.
+ struct SWarnUnused swu; // expected-warning{{variable 'swu' set but not used}}
+ struct SWarnUnused swu2;
+ swu = swu2;
+
+ int x;
+ x = 0;
+ return x + 5;
+}
+
+void f1(void) {
+ (void)^() {
+ int y; // expected-warning{{variable 'y' set but not used}}
+ y = 0;
+
+ int x;
+ x = 0;
+ return x;
+ };
+}
+
+void f2() {
+ // Don't warn for either of these cases.
+ constexpr int x = 2;
+ const int y = 1;
+ char a[x];
+ char b[y];
+}
diff --git a/clang/test/SemaObjC/foreach.m b/clang/test/SemaObjC/foreach.m
index 477c4fc38363..06800dd12bde 100644
--- a/clang/test/SemaObjC/foreach.m
+++ b/clang/test/SemaObjC/foreach.m
@@ -1,4 +1,4 @@
-/* RUN: %clang_cc1 -Wall -fsyntax-only -verify -std=c89 -pedantic %s
+/* RUN: %clang_cc1 -Wall -Wno-unused-but-set-variable -fsyntax-only -verify -std=c89 -pedantic %s
*/
@class NSArray;
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