diff --git a/examples/make_protect_lib/sim_main.cpp b/examples/make_protect_lib/sim_main.cpp
index 03697a316..8c0933f37 100644
--- a/examples/make_protect_lib/sim_main.cpp
+++ b/examples/make_protect_lib/sim_main.cpp
@@ -17,7 +17,8 @@
 #endif
 
 int main(int argc, char** argv) {
-    if (false && argc && argv) {}
+    (void)argc;
+    (void)argv;
 
     // Construct context to hold simulation time, etc
     const std::unique_ptr<VerilatedContext> contextp{new VerilatedContext};
diff --git a/include/verilated.cpp b/include/verilated.cpp
index 67fb673b9..c58a9fcc7 100644
--- a/include/verilated.cpp
+++ b/include/verilated.cpp
@@ -886,7 +886,7 @@ void _vl_vsformat(std::string& output, const std::string& format, va_list ap) VL
             case '^': {  // Realtime
                 const int lbits = va_arg(ap, int);
                 const double d = va_arg(ap, double);
-                if (lbits) {}  // UNUSED - always 64
+                (void)lbits;  // UNUSED - always 64
                 if (fmt == '^') {  // Realtime
                     if (!widthSet) width = Verilated::threadContextp()->impp()->timeFormatWidth();
                     const int timeunit = va_arg(ap, int);
@@ -3101,7 +3101,7 @@ void Verilated::stackCheck(QData needSize) VL_MT_UNSAFE {
                      haveSize / 1024, (needSize * 2) / 1024);
     }
 #else
-    if (false && needSize) {}  // Unused argument
+    (void)needSize;  // Unused argument
 #endif
 }
 
diff --git a/src/V3Number.cpp b/src/V3Number.cpp
index 31bb94c25..028ba5213 100644
--- a/src/V3Number.cpp
+++ b/src/V3Number.cpp
@@ -428,7 +428,7 @@ V3Number& V3Number::setLongS(int32_t value) {
         int32_t s;
     } u;
     u.s = value;
-    if (u.s) {}
+    (void)u.s;
     m_data.num()[0].m_value = u.u;
     opCleanThis();
     return *this;
@@ -441,7 +441,7 @@ V3Number& V3Number::setDouble(double value) {
         uint32_t u[2];
     } u;
     u.d = value;
-    if (u.d != 0.0) {}
+    (void)u.d;
     for (int i = 2; i < words(); i++) m_data.num()[i] = {0, 0};
     m_data.num()[0].m_value = u.u[0];
     m_data.num()[1].m_value = u.u[1];
@@ -2374,7 +2374,7 @@ V3Number& V3Number::opRToIRoundS(const V3Number& lhs) {
         uint64_t q;
     } u;
     u.d = v;
-    if (u.d == 0.0) {}
+    (void)u.d;
 
     const int exp = static_cast<int>((u.q >> 52ULL) & VL_MASK_Q(11)) - 1023;
     const int lsb = exp - 52;
diff --git a/src/V3Tristate.cpp b/src/V3Tristate.cpp
index faacf9a3b..893eb75ae 100644
--- a/src/V3Tristate.cpp
+++ b/src/V3Tristate.cpp
@@ -1691,7 +1691,7 @@ class TristateVisitor final : public TristateBaseVisitor {
                 AstVar* const enVarp = getCreateEnVarp(nodep->varp());
                 nodep->user1p(new AstVarRef{nodep->fileline(), enVarp, VAccess::READ});
             }
-            if (m_alhs) {}  // NOP; user1() already passed down from assignment
+            (void)m_alhs;  // NOP; user1() already passed down from assignment
         }
     }
 
diff --git a/src/V3Width.cpp b/src/V3Width.cpp
index ee949abeb..64742726a 100644
--- a/src/V3Width.cpp
+++ b/src/V3Width.cpp
@@ -6265,7 +6265,7 @@ class WidthVisitor final : public VNVisitor {
         nodep->dtypeChgSigned(nodep->lhsp()->isSigned());
         const AstNodeBiop* const newp = iterate_shift_final(nodep);
         VL_DANGLING(nodep);
-        if (newp) {}  // Ununused
+        (void)newp;  // Ununused
     }
     void iterate_shift_prelim(AstNodeBiop* nodep) {
         // Shifts
@@ -6617,7 +6617,7 @@ class WidthVisitor final : public VNVisitor {
         AstNodeDType* const expDTypep = underp->findUInt32DType();
         underp
             = iterateCheck(nodep, "file_descriptor", underp, SELF, FINAL, expDTypep, EXTEND_EXP);
-        if (underp) {}  // cppcheck
+        (void)underp;  // cppcheck
     }
     void iterateCheckSigned32(AstNode* nodep, const char* side, AstNode* underp, Stage stage) {
         // Coerce child to signed32 if not already. Child is self-determined
@@ -6629,7 +6629,7 @@ class WidthVisitor final : public VNVisitor {
             AstNodeDType* const expDTypep = nodep->findSigned32DType();
             underp = iterateCheck(nodep, side, underp, SELF, FINAL, expDTypep, EXTEND_EXP);
         }
-        if (underp) {}  // cppcheck
+        (void)underp;  // cppcheck
     }
     void iterateCheckReal(AstNode* nodep, const char* side, AstNode* underp, Stage stage) {
         // Coerce child to real if not already. Child is self-determined
@@ -6645,7 +6645,7 @@ class WidthVisitor final : public VNVisitor {
             AstNodeDType* const expDTypep = nodep->findDoubleDType();
             underp = iterateCheck(nodep, side, underp, SELF, FINAL, expDTypep, EXTEND_EXP);
         }
-        if (underp) {}  // cppcheck
+        (void)underp;  // cppcheck
     }
     void iterateCheckString(AstNode* nodep, const char* side, AstNode* underp, Stage stage) {
         if (stage & PRELIM) {
@@ -6655,7 +6655,7 @@ class WidthVisitor final : public VNVisitor {
             AstNodeDType* const expDTypep = nodep->findStringDType();
             underp = iterateCheck(nodep, side, underp, SELF, FINAL, expDTypep, EXTEND_EXP);
         }
-        if (underp) {}  // cppcheck
+        (void)underp;  // cppcheck
     }
     void iterateCheckTyped(AstNode* nodep, const char* side, AstNode* underp,
                            AstNodeDType* expDTypep, Stage stage) {
@@ -6665,7 +6665,7 @@ class WidthVisitor final : public VNVisitor {
         if (stage & FINAL) {
             underp = iterateCheck(nodep, side, underp, SELF, FINAL, expDTypep, EXTEND_EXP);
         }
-        if (underp) {}  // cppcheck
+        (void)underp;  // cppcheck
     }
     void iterateCheckSizedSelf(AstNode* nodep, const char* side, AstNode* underp, Determ determ,
                                Stage stage) {
@@ -6681,7 +6681,7 @@ class WidthVisitor final : public VNVisitor {
         underp = VN_IS(underp, NodeExpr) ? checkCvtUS(VN_AS(underp, NodeExpr)) : underp;
         AstNodeDType* const expDTypep = underp->dtypep();
         underp = iterateCheck(nodep, side, underp, SELF, FINAL, expDTypep, EXTEND_EXP);
-        if (underp) {}  // cppcheck
+        (void)underp;  // cppcheck
     }
     void iterateCheckAssign(AstNode* nodep, const char* side, AstNode* rhsp, Stage stage,
                             AstNodeDType* lhsDTypep) {
@@ -6727,7 +6727,7 @@ class WidthVisitor final : public VNVisitor {
         rhsp = iterateCheck(nodep, side, rhsp, ASSIGN, FINAL, lhsDTypep,
                             lhsStream ? EXTEND_OFF : EXTEND_LHS);
         // if (debug()) nodep->dumpTree("-  checkout: ");
-        if (rhsp) {}  // cppcheck
+        (void)rhsp;  // cppcheck
     }
 
     void iterateCheckBool(AstNode* nodep, const char* side, AstNode* underp, Stage stage) {
diff --git a/test_regress/t/t_dpi_context_c.cpp b/test_regress/t/t_dpi_context_c.cpp
index e21d79363..9025e9407 100644
--- a/test_regress/t/t_dpi_context_c.cpp
+++ b/test_regress/t/t_dpi_context_c.cpp
@@ -77,7 +77,7 @@ int dpic_line() {
         printf("%%Warning: svGetCallerInfo failed\n");
         return 0;
     }
-    if (svGetCallerInfo(nullptr, nullptr)) {}  // Check doesn't segflt
+    (void)svGetCallerInfo(nullptr, nullptr);  // Check doesn't segflt
     return lineno;
 }
 
@@ -115,7 +115,7 @@ int dpic_save(int value) {
     }
 
     vp.i = value;
-    if (vp.i) {}
+    (void)vp.i;
     if (svPutUserData(scope, &Dpic_Unique, vp.ptr)) {
         printf("%%Warning: svPutUserData failed\n");
         return 0;
diff --git a/test_regress/t/t_dpi_export_context2_bad.cpp b/test_regress/t/t_dpi_export_context2_bad.cpp
index 4c4eeb82a..02d92ece2 100644
--- a/test_regress/t/t_dpi_export_context2_bad.cpp
+++ b/test_regress/t/t_dpi_export_context2_bad.cpp
@@ -35,11 +35,12 @@ int dpii_task() {
 
     // Check DPI warnings
     svScope scope = svGetScope();  // Will warn
-    if (scope) {}  // Unused
+    (void)scope;  // Unused
     const char* filenamep = "";
     int lineno = 0;
     svGetCallerInfo(&filenamep, &lineno);  // Will warn
-    if (filenamep && lineno) {}  // Unused
+    (void)filenamep;  // Unused
+    (void)lineno;  // Unused
 
     dpix_task();
     return 0;
diff --git a/test_regress/t/t_dpi_open_elem_c.cpp b/test_regress/t/t_dpi_open_elem_c.cpp
index 0af199d79..4df979b85 100644
--- a/test_regress/t/t_dpi_open_elem_c.cpp
+++ b/test_regress/t/t_dpi_open_elem_c.cpp
@@ -127,7 +127,7 @@ static void _dpii_logic_elem_ux(int p, int u, const svOpenArrayHandle i, const s
 #endif
     int sizeInputOfArray = svSizeOfArray(i);
     // svSizeOfArray(i) undeterministic as not in C representation
-    if (sizeInputOfArray) {}
+    (void)sizeInputOfArray;  // unused
 
     for (int a = svLow(i, 1); a <= svHigh(i, 1); ++a) {
         if (dim == 1) {