diff --git a/headers/modsecurity/anchored_variable.h b/headers/modsecurity/anchored_variable.h
index 03ccef49..071b9f19 100644
--- a/headers/modsecurity/anchored_variable.h
+++ b/headers/modsecurity/anchored_variable.h
@@ -43,6 +43,15 @@ class Transaction;
 class AnchoredVariable {
  public:
     AnchoredVariable(Transaction* t, std::string name);
+
+    AnchoredVariable(const AnchoredVariable &a) {
+        m_transaction = a.m_transaction;
+        m_offset = a.m_offset;
+        m_name = a.m_name;
+        m_value = a.m_value;
+        m_var = a.m_var;
+    }
+
     ~AnchoredVariable();
 
     void unset();
diff --git a/src/actions/set_var.cc b/src/actions/set_var.cc
index 427e11f2..599ec511 100644
--- a/src/actions/set_var.cc
+++ b/src/actions/set_var.cc
@@ -49,7 +49,6 @@ bool SetVar::evaluate(Rule *rule, Transaction *t) {
     }
 
     std::string m_variableNameExpanded;
-    std::vector<const VariableValue *> l;
 
     auto *v = m_variable.get();
     variables::Tx_DynamicElement *tx = dynamic_cast<
diff --git a/src/actions/transformations/utf8_to_unicode.cc b/src/actions/transformations/utf8_to_unicode.cc
index 1cdf1ddb..305b8353 100644
--- a/src/actions/transformations/utf8_to_unicode.cc
+++ b/src/actions/transformations/utf8_to_unicode.cc
@@ -63,7 +63,6 @@ std::string Utf8ToUnicode::evaluate(std::string value,
 
 char *Utf8ToUnicode::inplace(unsigned char *input,
     uint64_t input_len, int *changed) {
-    int length = 0;
     unsigned int count = 0;
     char *data;
     char *data_orig;
@@ -120,6 +119,7 @@ char *Utf8ToUnicode::inplace(unsigned char *input,
                 unicode_len = 2;
                 count+=6;
                 if (count <= len) {
+                    int length = 0;
                     /* compute character number */
                     d = ((c & 0x1F) << 6) | (*(utf + 1) & 0x3F);
                     *data++ = '%';
@@ -169,6 +169,7 @@ char *Utf8ToUnicode::inplace(unsigned char *input,
                 unicode_len = 3;
                 count+=6;
                 if (count <= len) {
+                    int length = 0;
                     /* compute character number */
                     d = ((c & 0x0F) << 12)
                         | ((*(utf + 1) & 0x3F) << 6)
@@ -229,6 +230,7 @@ char *Utf8ToUnicode::inplace(unsigned char *input,
                 unicode_len = 4;
                 count+=7;
                 if (count <= len) {
+                    int length = 0;
                     /* compute character number */
                     d = ((c & 0x07) << 18)
                         | ((*(utf + 1) & 0x3F) << 12)
diff --git a/src/anchored_variable.cc b/src/anchored_variable.cc
index 2bedc8fd..1f834e01 100644
--- a/src/anchored_variable.cc
+++ b/src/anchored_variable.cc
@@ -30,10 +30,10 @@ namespace modsecurity {
 AnchoredVariable::AnchoredVariable(Transaction *t,
     std::string name)
     : m_transaction(t),
-    m_var(NULL),
     m_offset(0),
     m_name(""),
-    m_value("") {
+    m_value(""),
+    m_var(NULL) {
         m_name.append(name);
         m_var = new VariableValue(&m_name);
 }
diff --git a/src/audit_log/writer/parallel.cc b/src/audit_log/writer/parallel.cc
index bba7b284..768ed6a2 100644
--- a/src/audit_log/writer/parallel.cc
+++ b/src/audit_log/writer/parallel.cc
@@ -75,7 +75,7 @@ inline std::string Parallel::logFilePath(time_t *t,
 
 
 bool Parallel::init(std::string *error) {
-    bool ret = true;
+    bool ret;
     if (!m_audit->m_path1.empty()) {
         ret = utils::SharedFiles::getInstance().open(m_audit->m_path1, error);
         if (!ret) {
diff --git a/src/collection/backend/lmdb.cc b/src/collection/backend/lmdb.cc
index 2ad25a22..621aac0d 100644
--- a/src/collection/backend/lmdb.cc
+++ b/src/collection/backend/lmdb.cc
@@ -284,7 +284,7 @@ void LMDB::resolveSingleMatch(const std::string& var,
 
     string2val(var, &mdb_key);
 
-    rc = mdb_cursor_open(txn, dbi, &cursor);
+    mdb_cursor_open(txn, dbi, &cursor);
     while ((rc = mdb_cursor_get(cursor, &mdb_key,
             &mdb_value_ret, MDB_NEXT_DUP)) == 0) {
         std::string *a = new std::string(
@@ -536,7 +536,6 @@ void LMDB::resolveRegularExpression(const std::string& var,
     int rc;
     MDB_stat mst;
     MDB_cursor *cursor;
-    size_t pos;
 
     Utils::Regex r(var);
 
diff --git a/src/operators/pm.cc b/src/operators/pm.cc
index 08401cde..86bac240 100644
--- a/src/operators/pm.cc
+++ b/src/operators/pm.cc
@@ -34,7 +34,6 @@ namespace operators {
 
 Pm::~Pm() {
     acmp_node_t *root = m_p->root_node;
-    acmp_node_t *node = root;
 
     cleanup(root);
 
diff --git a/src/operators/verify_cpf.cc b/src/operators/verify_cpf.cc
index ac4874bf..a58adbdd 100644
--- a/src/operators/verify_cpf.cc
+++ b/src/operators/verify_cpf.cc
@@ -129,15 +129,15 @@ bool VerifyCPF::evaluate(Transaction *t, Rule *rule,
 
     for (i = 0; i < input.size() - 1 && is_cpf == false; i++) {
         matches = m_re->searchAll(input.substr(i, input.size()));
-        for (const auto & i : matches) {
-            is_cpf = verify(i.str().c_str(), i.str().size());
+        for (const auto & m : matches) {
+            is_cpf = verify(m.str().c_str(), m.str().size());
             if (is_cpf) {
-                logOffset(ruleMessage, i.offset(), i.str().size());
+                logOffset(ruleMessage, m.offset(), m.str().size());
                 if (rule && t && rule->m_containsCaptureAction) {
                     t->m_collections.m_tx_collection->storeOrUpdateFirst(
-                        "0", i.str());
+                        "0", m.str());
                     ms_dbg_a(t, 7, "Added VerifyCPF match TX.0: " + \
-                        i.str());
+                        m.str());
                 }
 
                 goto out;
diff --git a/src/rule.cc b/src/rule.cc
index 0b97d428..071526e6 100644
--- a/src/rule.cc
+++ b/src/rule.cc
@@ -512,9 +512,6 @@ inline void Rule::getFinalVars(variables::Variables *vars,
 
     for (int i = 0; i < m_variables->size(); i++) {
         Variable *variable = m_variables->at(i);
-        std::vector<const VariableValue *> e;
-
-
         if (exclusion->contains(variable)) {
             continue;
         }
@@ -623,7 +620,6 @@ bool Rule::evaluate(Transaction *trans,
     variables::Variables *variables = this->m_variables;
     bool recursiveGlobalRet;
     bool containsBlock = m_containsStaticBlockAction;
-    std::vector<std::unique_ptr<VariableValue>> finalVars;
     std::string eparam;
     variables::Variables vars;
     vars.reserve(4);
diff --git a/src/rules_properties.cc b/src/rules_properties.cc
index 78f0e9d1..7f29edb9 100644
--- a/src/rules_properties.cc
+++ b/src/rules_properties.cc
@@ -35,7 +35,6 @@ void ConfigUnicodeMap::loadConfig(std::string f, double configCodePage,
     int length = 0;
     int Map = 0;
     int processing = 0;
-    unsigned int codepage = 0;
 
     driver->m_unicodeMapTable.m_set = true;
     driver->m_unicodeMapTable.m_unicodeCodePage = configCodePage;
@@ -88,7 +87,7 @@ void ConfigUnicodeMap::loadConfig(std::string f, double configCodePage,
     p = strtok_r(buf, CODEPAGE_SEPARATORS, &savedptr);
 
     while (p != NULL) {
-        codepage = atol(p);
+        unsigned int codepage = atol(p);
 
         if (codepage == configCodePage) {
             found = 1;
diff --git a/src/transaction.cc b/src/transaction.cc
index dc2ca655..179a60d4 100644
--- a/src/transaction.cc
+++ b/src/transaction.cc
@@ -855,9 +855,9 @@ int Transaction::processRequestBody() {
     std::string fullRequest;
     std::vector<const VariableValue *> l;
     m_variableRequestHeaders.resolve(&l);
-    for (auto &a : l) {
-        fullRequest = fullRequest + a->getKey() + ": " + a->getValue() + "\n";
-        delete a;
+    for (auto &h : l) {
+        fullRequest = fullRequest + h->getKey() + ": " + h->getValue() + "\n";
+        delete h;
     }
 
     fullRequest = fullRequest + "\n\n";
diff --git a/src/unique_id.cc b/src/unique_id.cc
index 7334d5a4..f271164a 100644
--- a/src/unique_id.cc
+++ b/src/unique_id.cc
@@ -159,7 +159,6 @@ std::string const UniqueId::ethernetMacAddress() {
         }
 
         if (ioctl(sock, SIOCGIFHWADDR, ifr) == 0) {
-            int i = 0;
             if (!ifr->ifr_addr.sa_data[0] && !ifr->ifr_addr.sa_data[1]
                 && !ifr->ifr_addr.sa_data[2]) {
                 continue;
@@ -223,7 +222,9 @@ std::string const UniqueId::ethernetMacAddress() {
     free(pAdapterInfo);
 #endif
 
+#if defined(__linux__) || defined(__gnu_linux__) || defined(DARWIN) || defined(WIN32)
 end:
+#endif
     return std::string(reinterpret_cast<const char *>(mac));
 #if defined(__linux__) || defined(__gnu_linux__) || defined(DARWIN) || defined(WIN32)
 failed:
diff --git a/src/utils/geo_lookup.cc b/src/utils/geo_lookup.cc
index 313d81ff..2e95244b 100644
--- a/src/utils/geo_lookup.cc
+++ b/src/utils/geo_lookup.cc
@@ -120,7 +120,6 @@ bool GeoLookup::lookup(const std::string& target, Transaction *trans,
     if (m_version == VERSION_MAXMIND) {
         int gai_error, mmdb_error;
         MMDB_lookup_result_s r;
-        int status;
 
         r = MMDB_lookup_string(&mmdb, target.c_str(), &gai_error, &mmdb_error);
 
@@ -145,7 +144,7 @@ bool GeoLookup::lookup(const std::string& target, Transaction *trans,
         } else {
             MMDB_entry_data_s entry_data;
 
-            status = MMDB_get_value(&r.entry, &entry_data,
+            int status = MMDB_get_value(&r.entry, &entry_data,
                 "country", "iso_code", NULL);
             if (status == MMDB_SUCCESS && entry_data.has_data) {
                 trans->m_variableGeo.set("COUNTRY_CODE",
diff --git a/src/variables/variable.cc b/src/variables/variable.cc
index 1d193593..84b9d632 100644
--- a/src/variables/variable.cc
+++ b/src/variables/variable.cc
@@ -76,12 +76,12 @@ void Variable::addsKeyExclusion(Variable *v) {
 }
 
 
-std::string operator+(std::string a, Variable *v) {
+std::string operator+(const std::string &a, Variable *v) {
     return a + *v->m_fullName.get();
 }
 
 
-std::string operator+(std::string a, Variables *v) {
+std::string operator+(const std::string &a, Variables *v) {
     std::string test;
     for (auto &b : *v) {
         if (test.empty()) {
diff --git a/src/variables/variable.h b/src/variables/variable.h
index e62ed6c1..7f00a698 100644
--- a/src/variables/variable.h
+++ b/src/variables/variable.h
@@ -669,8 +669,8 @@ class VariableModificatorCount : public Variable {
 };
 
 
-std::string operator+(std::string a, modsecurity::variables::Variable *v);
-std::string operator+(std::string a, modsecurity::variables::Variables *v);
+std::string operator+(const std::string &a, modsecurity::variables::Variable *v);
+std::string operator+(const std::string &a, modsecurity::variables::Variables *v);
 
 
 }  // namespace variables
diff --git a/src/variables/xml.cc b/src/variables/xml.cc
index b508ad98..0ecb090e 100644
--- a/src/variables/xml.cc
+++ b/src/variables/xml.cc
@@ -61,7 +61,7 @@ void XML::evaluate(Transaction *t,
     std::string param;
     const xmlChar* xpathExpr = NULL;
     int i;
-    size_t pos;
+    //size_t pos;
 
     param = m_name;
     /*
diff --git a/test/common/modsecurity_test.cc b/test/common/modsecurity_test.cc
index 28a48500..888b67be 100644
--- a/test/common/modsecurity_test.cc
+++ b/test/common/modsecurity_test.cc
@@ -145,7 +145,7 @@ void ModSecurityTest<T>::cmd_options(int argc, char **argv) {
         i++;
         m_count_all = true;
     }
-    if (const char* env_p = std::getenv("AUTOMAKE_TESTS")) {
+    if (std::getenv("AUTOMAKE_TESTS")) {
         m_automake_output = true;
     }
 
diff --git a/test/cppcheck_suppressions.txt b/test/cppcheck_suppressions.txt
index 7c0f1356..4a078520 100644
--- a/test/cppcheck_suppressions.txt
+++ b/test/cppcheck_suppressions.txt
@@ -6,7 +6,7 @@ unusedFunction:src/utils/mbedtls/md5.c
 unusedFunction:src/utils/mbedtls/base64.c
 unusedFunction:src/modsecurity.cc
 unusedFunction:src/utils/msc_tree.cc
-unusedFunction:src/utils/acmp.cc
+*:src/utils/acmp.cc
 unusedFunction:src/macro_expansion.cc
 unusedFunction:src/rules.cc
 unusedFunction:test/optimization/optimization.cc
@@ -43,8 +43,19 @@ missingInclude:*
 unreadVariable:test/regression/regression.cc:380
 shiftNegative:src/utils/msc_tree.cc
 nullPointerRedundantCheck:src/utils/msc_tree.cc:654
-*:test/benchmark/owasp-v3/util/av-scanning/runAV/common.c
+*:test/benchmark/owasp-v3/util/av-scanning/runAV/*
 passedByValue:src/variables/time.h:34
 knownConditionTrueFalse:test/regression/regression.cc:453
 unusedFunction:test/unit/unit_test.cc:33
-
+useStlAlgorithm:test/unit/unit.cc:174
+useStlAlgorithm:test/unit/unit.cc:209
+useStlAlgorithm:test/regression/regression.cc:493
+constStatement:test/common/modsecurity_test.cc:81
+*:src/utils/msc_tree.cc
+useStlAlgorithm:src/rules_exceptions.cc:193
+useStlAlgorithm:src/rules_exceptions.cc:199
+invalidScanfArgType_int:src/rules_properties.cc
+useStlAlgorithm:src/utils/shared_files.cc:41
+duplicateCondition:src/utils/geo_lookup.cc:82
+useStlAlgorithm:src/rule.cc
+variableScope:src/operators/verify_cpf.cc:45
diff --git a/test/optimization/optimization.cc b/test/optimization/optimization.cc
index ea8ac4c9..c681a00e 100644
--- a/test/optimization/optimization.cc
+++ b/test/optimization/optimization.cc
@@ -67,7 +67,7 @@ int main(int argc, char **argv) {
     std::cout << std::endl;
 
     int nphases = modsecurity::Phases::NUMBER_OF_PHASES;
-    for (int i = 0; i < nphases; i++) {
+    for (int j = 0; j < nphases; j++) {
         std::vector<Rule *> rules = modsecRules->m_rules[i];
         if (rules.size() == 0) {
             continue;
diff --git a/test/regression/regression_test.cc b/test/regression/regression_test.cc
index 81258678..881ba872 100644
--- a/test/regression/regression_test.cc
+++ b/test/regression/regression_test.cc
@@ -200,13 +200,13 @@ RegressionTest *RegressionTest::from_yajl_node(const yajl_val &node) {
             }
         }
         if (strcmp(key, "rules") == 0) {
-            std::stringstream i;
+            std::stringstream si;
             for (int j = 0; j < val->u.array.len; j++) {
                 yajl_val val2 = val->u.array.values[ j ];
-                const char *key = YAJL_GET_STRING(val2);
-                i << key << "\n";
+                const char *keyj = YAJL_GET_STRING(val2);
+                si << keyj << "\n";
             }
-            u->rules = i.str();
+            u->rules = si.str();
         }
     }
 
diff --git a/tools/rules-check/rules-check.cc b/tools/rules-check/rules-check.cc
index fac28923..8727ad0b 100644
--- a/tools/rules-check/rules-check.cc
+++ b/tools/rules-check/rules-check.cc
@@ -71,7 +71,7 @@ int main(int argc, char **argv) {
         }
 
         if (argFull.empty() == false) {
-            arg = argFull.c_str();
+            arg = strdup(argFull.c_str());
             argFull.clear();
         }