diff --git a/lib/base/configobject.cpp b/lib/base/configobject.cpp
index 4317771d1..f71043d4b 100644
--- a/lib/base/configobject.cpp
+++ b/lib/base/configobject.cpp
@@ -421,7 +421,7 @@ void ConfigObject::OnAllConfigLoaded()
 		m_Zone = ctype->GetObject(zoneName);
 }
 
-void ConfigObject::CreateChildObjects(const Type::Ptr& childType)
+void ConfigObject::CreateChildObjects(const Type::Ptr&)
 {
 	/* Nothing to do here. */
 }
diff --git a/lib/base/configuration.cpp b/lib/base/configuration.cpp
index 908c16183..86267fba3 100644
--- a/lib/base/configuration.cpp
+++ b/lib/base/configuration.cpp
@@ -72,7 +72,7 @@ String Configuration::GetApiBindHost() const
 	return Configuration::ApiBindHost;
 }
 
-void Configuration::SetApiBindHost(const String& val, bool suppress_events, const Value& cookie)
+void Configuration::SetApiBindHost(const String& val, [[maybe_unused]] bool suppress_events, [[maybe_unused]] const Value& cookie)
 {
 	HandleUserWrite("ApiBindHost", &Configuration::ApiBindHost, val, m_ReadOnly);
 }
@@ -82,7 +82,7 @@ String Configuration::GetApiBindPort() const
 	return Configuration::ApiBindPort;
 }
 
-void Configuration::SetApiBindPort(const String& val, bool suppress_events, const Value& cookie)
+void Configuration::SetApiBindPort(const String& val, [[maybe_unused]] bool suppress_events, [[maybe_unused]] const Value& cookie)
 {
 	HandleUserWrite("ApiBindPort", &Configuration::ApiBindPort, val, m_ReadOnly);
 }
@@ -92,7 +92,7 @@ bool Configuration::GetAttachDebugger() const
 	return Configuration::AttachDebugger;
 }
 
-void Configuration::SetAttachDebugger(bool val, bool suppress_events, const Value& cookie)
+void Configuration::SetAttachDebugger(bool val, [[maybe_unused]] bool suppress_events, [[maybe_unused]] const Value& cookie)
 {
 	HandleUserWrite("AttachDebugger", &Configuration::AttachDebugger, val, m_ReadOnly);
 }
@@ -102,7 +102,7 @@ String Configuration::GetCacheDir() const
 	return Configuration::CacheDir;
 }
 
-void Configuration::SetCacheDir(const String& val, bool suppress_events, const Value& cookie)
+void Configuration::SetCacheDir(const String& val, [[maybe_unused]] bool suppress_events, [[maybe_unused]] const Value& cookie)
 {
 	HandleUserWrite("CacheDir", &Configuration::CacheDir, val, m_ReadOnly);
 }
@@ -112,7 +112,7 @@ int Configuration::GetConcurrency() const
 	return Configuration::Concurrency;
 }
 
-void Configuration::SetConcurrency(int val, bool suppress_events, const Value& cookie)
+void Configuration::SetConcurrency(int val, [[maybe_unused]] bool suppress_events, [[maybe_unused]] const Value& cookie)
 {
 	HandleUserWrite("Concurrency", &Configuration::Concurrency, val, m_ReadOnly);
 	Configuration::ConcurrencyWasModified = true;
@@ -123,7 +123,7 @@ String Configuration::GetConfigDir() const
 	return Configuration::ConfigDir;
 }
 
-void Configuration::SetConfigDir(const String& val, bool suppress_events, const Value& cookie)
+void Configuration::SetConfigDir(const String& val, [[maybe_unused]] bool suppress_events, [[maybe_unused]] const Value& cookie)
 {
 	HandleUserWrite("ConfigDir", &Configuration::ConfigDir, val, m_ReadOnly);
 }
@@ -133,7 +133,7 @@ String Configuration::GetDataDir() const
 	return Configuration::DataDir;
 }
 
-void Configuration::SetDataDir(const String& val, bool suppress_events, const Value& cookie)
+void Configuration::SetDataDir(const String& val, [[maybe_unused]] bool suppress_events, [[maybe_unused]] const Value& cookie)
 {
 	HandleUserWrite("DataDir", &Configuration::DataDir, val, m_ReadOnly);
 }
@@ -143,7 +143,7 @@ String Configuration::GetEventEngine() const
 	return Configuration::EventEngine;
 }
 
-void Configuration::SetEventEngine(const String& val, bool suppress_events, const Value& cookie)
+void Configuration::SetEventEngine(const String& val, [[maybe_unused]] bool suppress_events, [[maybe_unused]] const Value& cookie)
 {
 	HandleUserWrite("EventEngine", &Configuration::EventEngine, val, m_ReadOnly);
 }
@@ -153,7 +153,7 @@ String Configuration::GetIncludeConfDir() const
 	return Configuration::IncludeConfDir;
 }
 
-void Configuration::SetIncludeConfDir(const String& val, bool suppress_events, const Value& cookie)
+void Configuration::SetIncludeConfDir(const String& val, [[maybe_unused]] bool suppress_events, [[maybe_unused]] const Value& cookie)
 {
 	HandleUserWrite("IncludeConfDir", &Configuration::IncludeConfDir, val, m_ReadOnly);
 }
@@ -163,7 +163,7 @@ String Configuration::GetInitRunDir() const
 	return Configuration::InitRunDir;
 }
 
-void Configuration::SetInitRunDir(const String& val, bool suppress_events, const Value& cookie)
+void Configuration::SetInitRunDir(const String& val, [[maybe_unused]] bool suppress_events, [[maybe_unused]] const Value& cookie)
 {
 	HandleUserWrite("InitRunDir", &Configuration::InitRunDir, val, m_ReadOnly);
 }
@@ -173,7 +173,7 @@ String Configuration::GetLogDir() const
 	return Configuration::LogDir;
 }
 
-void Configuration::SetLogDir(const String& val, bool suppress_events, const Value& cookie)
+void Configuration::SetLogDir(const String& val, [[maybe_unused]] bool suppress_events, [[maybe_unused]] const Value& cookie)
 {
 	HandleUserWrite("LogDir", &Configuration::LogDir, val, m_ReadOnly);
 }
@@ -183,7 +183,7 @@ String Configuration::GetModAttrPath() const
 	return Configuration::ModAttrPath;
 }
 
-void Configuration::SetModAttrPath(const String& val, bool suppress_events, const Value& cookie)
+void Configuration::SetModAttrPath(const String& val, [[maybe_unused]] bool suppress_events, [[maybe_unused]] const Value& cookie)
 {
 	HandleUserWrite("ModAttrPath", &Configuration::ModAttrPath, val, m_ReadOnly);
 }
@@ -193,7 +193,7 @@ String Configuration::GetObjectsPath() const
 	return Configuration::ObjectsPath;
 }
 
-void Configuration::SetObjectsPath(const String& val, bool suppress_events, const Value& cookie)
+void Configuration::SetObjectsPath(const String& val, [[maybe_unused]] bool suppress_events, [[maybe_unused]] const Value& cookie)
 {
 	HandleUserWrite("ObjectsPath", &Configuration::ObjectsPath, val, m_ReadOnly);
 }
@@ -203,7 +203,7 @@ String Configuration::GetPidPath() const
 	return Configuration::PidPath;
 }
 
-void Configuration::SetPidPath(const String& val, bool suppress_events, const Value& cookie)
+void Configuration::SetPidPath(const String& val, [[maybe_unused]] bool suppress_events, [[maybe_unused]] const Value& cookie)
 {
 	HandleUserWrite("PidPath", &Configuration::PidPath, val, m_ReadOnly);
 }
@@ -213,7 +213,7 @@ String Configuration::GetPkgDataDir() const
 	return Configuration::PkgDataDir;
 }
 
-void Configuration::SetPkgDataDir(const String& val, bool suppress_events, const Value& cookie)
+void Configuration::SetPkgDataDir(const String& val, [[maybe_unused]] bool suppress_events, [[maybe_unused]] const Value& cookie)
 {
 	HandleUserWrite("PkgDataDir", &Configuration::PkgDataDir, val, m_ReadOnly);
 }
@@ -223,7 +223,7 @@ String Configuration::GetPrefixDir() const
 	return Configuration::PrefixDir;
 }
 
-void Configuration::SetPrefixDir(const String& val, bool suppress_events, const Value& cookie)
+void Configuration::SetPrefixDir(const String& val, [[maybe_unused]] bool suppress_events, [[maybe_unused]] const Value& cookie)
 {
 	HandleUserWrite("PrefixDir", &Configuration::PrefixDir, val, m_ReadOnly);
 }
@@ -233,7 +233,7 @@ String Configuration::GetProgramData() const
 	return Configuration::ProgramData;
 }
 
-void Configuration::SetProgramData(const String& val, bool suppress_events, const Value& cookie)
+void Configuration::SetProgramData(const String& val, [[maybe_unused]] bool suppress_events, [[maybe_unused]] const Value& cookie)
 {
 	HandleUserWrite("ProgramData", &Configuration::ProgramData, val, m_ReadOnly);
 }
@@ -243,7 +243,7 @@ int Configuration::GetRLimitFiles() const
 	return Configuration::RLimitFiles;
 }
 
-void Configuration::SetRLimitFiles(int val, bool suppress_events, const Value& cookie)
+void Configuration::SetRLimitFiles(int val, [[maybe_unused]] bool suppress_events, [[maybe_unused]] const Value& cookie)
 {
 	HandleUserWrite("RLimitFiles", &Configuration::RLimitFiles, val, m_ReadOnly);
 }
@@ -253,7 +253,7 @@ int Configuration::GetRLimitProcesses() const
 	return RLimitProcesses;
 }
 
-void Configuration::SetRLimitProcesses(int val, bool suppress_events, const Value& cookie)
+void Configuration::SetRLimitProcesses(int val, [[maybe_unused]] bool suppress_events, [[maybe_unused]] const Value& cookie)
 {
 	HandleUserWrite("RLimitProcesses", &Configuration::RLimitProcesses, val, m_ReadOnly);
 }
@@ -263,7 +263,7 @@ int Configuration::GetRLimitStack() const
 	return Configuration::RLimitStack;
 }
 
-void Configuration::SetRLimitStack(int val, bool suppress_events, const Value& cookie)
+void Configuration::SetRLimitStack(int val, [[maybe_unused]] bool suppress_events, [[maybe_unused]] const Value& cookie)
 {
 	HandleUserWrite("RLimitStack", &Configuration::RLimitStack, val, m_ReadOnly);
 }
@@ -273,7 +273,7 @@ String Configuration::GetRunAsGroup() const
 	return Configuration::RunAsGroup;
 }
 
-void Configuration::SetRunAsGroup(const String& val, bool suppress_events, const Value& cookie)
+void Configuration::SetRunAsGroup(const String& val, [[maybe_unused]] bool suppress_events, [[maybe_unused]] const Value& cookie)
 {
 	HandleUserWrite("RunAsGroup", &Configuration::RunAsGroup, val, m_ReadOnly);
 }
@@ -283,7 +283,7 @@ String Configuration::GetRunAsUser() const
 	return Configuration::RunAsUser;
 }
 
-void Configuration::SetRunAsUser(const String& val, bool suppress_events, const Value& cookie)
+void Configuration::SetRunAsUser(const String& val, [[maybe_unused]] bool suppress_events, [[maybe_unused]] const Value& cookie)
 {
 	HandleUserWrite("RunAsUser", &Configuration::RunAsUser, val, m_ReadOnly);
 }
@@ -293,7 +293,7 @@ String Configuration::GetSpoolDir() const
 	return Configuration::SpoolDir;
 }
 
-void Configuration::SetSpoolDir(const String& val, bool suppress_events, const Value& cookie)
+void Configuration::SetSpoolDir(const String& val, [[maybe_unused]] bool suppress_events, [[maybe_unused]] const Value& cookie)
 {
 	HandleUserWrite("SpoolDir", &Configuration::SpoolDir, val, m_ReadOnly);
 }
@@ -303,7 +303,7 @@ String Configuration::GetStatePath() const
 	return Configuration::StatePath;
 }
 
-void Configuration::SetStatePath(const String& val, bool suppress_events, const Value& cookie)
+void Configuration::SetStatePath(const String& val, [[maybe_unused]] bool suppress_events, [[maybe_unused]] const Value& cookie)
 {
 	HandleUserWrite("StatePath", &Configuration::StatePath, val, m_ReadOnly);
 }
@@ -313,7 +313,7 @@ double Configuration::GetTlsHandshakeTimeout() const
 	return Configuration::TlsHandshakeTimeout;
 }
 
-void Configuration::SetTlsHandshakeTimeout(double val, bool suppress_events, const Value& cookie)
+void Configuration::SetTlsHandshakeTimeout(double val, [[maybe_unused]] bool suppress_events, [[maybe_unused]] const Value& cookie)
 {
 	HandleUserWrite("TlsHandshakeTimeout", &Configuration::TlsHandshakeTimeout, val, m_ReadOnly);
 }
@@ -323,7 +323,7 @@ String Configuration::GetVarsPath() const
 	return Configuration::VarsPath;
 }
 
-void Configuration::SetVarsPath(const String& val, bool suppress_events, const Value& cookie)
+void Configuration::SetVarsPath(const String& val, [[maybe_unused]] bool suppress_events, [[maybe_unused]] const Value& cookie)
 {
 	HandleUserWrite("VarsPath", &Configuration::VarsPath, val, m_ReadOnly);
 }
@@ -333,7 +333,7 @@ String Configuration::GetZonesDir() const
 	return Configuration::ZonesDir;
 }
 
-void Configuration::SetZonesDir(const String& val, bool suppress_events, const Value& cookie)
+void Configuration::SetZonesDir(const String& val, [[maybe_unused]] bool suppress_events, [[maybe_unused]] const Value& cookie)
 {
 	HandleUserWrite("ZonesDir", &Configuration::ZonesDir, val, m_ReadOnly);
 }
@@ -343,7 +343,7 @@ String Configuration::GetLocalStateDir() const
 	return Configuration::LocalStateDir;
 }
 
-void Configuration::SetLocalStateDir(const String& val, bool suppress_events, const Value& cookie)
+void Configuration::SetLocalStateDir(const String& val, [[maybe_unused]] bool suppress_events, [[maybe_unused]] const Value& cookie)
 {
 	HandleUserWrite("LocalStateDir", &Configuration::LocalStateDir, val, m_ReadOnly);
 }
@@ -353,7 +353,7 @@ String Configuration::GetSysconfDir() const
 	return Configuration::SysconfDir;
 }
 
-void Configuration::SetSysconfDir(const String& val, bool suppress_events, const Value& cookie)
+void Configuration::SetSysconfDir(const String& val, [[maybe_unused]] bool suppress_events, [[maybe_unused]] const Value& cookie)
 {
 	HandleUserWrite("SysconfDir", &Configuration::SysconfDir, val, m_ReadOnly);
 }
@@ -363,7 +363,7 @@ String Configuration::GetRunDir() const
 	return Configuration::RunDir;
 }
 
-void Configuration::SetRunDir(const String& val, bool suppress_events, const Value& cookie)
+void Configuration::SetRunDir(const String& val, [[maybe_unused]] bool suppress_events, [[maybe_unused]] const Value& cookie)
 {
 	HandleUserWrite("RunDir", &Configuration::RunDir, val, m_ReadOnly);
 }
diff --git a/lib/base/io-engine.cpp b/lib/base/io-engine.cpp
index 0792be5cc..6977f3427 100644
--- a/lib/base/io-engine.cpp
+++ b/lib/base/io-engine.cpp
@@ -97,7 +97,7 @@ IoEngine::IoEngine() : m_IoContext(), m_KeepAlive(boost::asio::make_work_guard(m
 
 IoEngine::~IoEngine()
 {
-	for (auto& thread : m_Threads) {
+	for ([[maybe_unused]] auto& thread : m_Threads) {
 		boost::asio::post(m_IoContext, []() {
 			throw TerminateIoThread();
 		});
diff --git a/lib/base/object.cpp b/lib/base/object.cpp
index 92a43b912..c2d5cb74b 100644
--- a/lib/base/object.cpp
+++ b/lib/base/object.cpp
@@ -125,7 +125,7 @@ Value Object::GetFieldByName(const String& field, bool sandboxed, const DebugInf
 	return GetField(fid);
 }
 
-void Object::SetFieldByName(const String& field, const Value& value, bool overrideFrozen, const DebugInfo& debugInfo)
+void Object::SetFieldByName(const String& field, const Value& value, [[maybe_unused]] bool overrideFrozen, const DebugInfo& debugInfo)
 {
 	Type::Ptr type = GetReflectionType();
 
@@ -150,22 +150,22 @@ void Object::SetFieldByName(const String& field, const Value& value, bool overri
 	}
 }
 
-void Object::Validate(int types, const ValidationUtils& utils)
+void Object::Validate([[maybe_unused]] int types, const ValidationUtils&)
 {
 	/* Nothing to do here. */
 }
 
-void Object::ValidateField(int id, const Lazy<Value>& lvalue, const ValidationUtils& utils)
+void Object::ValidateField([[maybe_unused]] int id, const Lazy<Value>&, const ValidationUtils&)
 {
 	/* Nothing to do here. */
 }
 
-void Object::NotifyField(int id, const Value& cookie)
+void Object::NotifyField([[maybe_unused]] int id, [[maybe_unused]] const Value& cookie)
 {
 	BOOST_THROW_EXCEPTION(std::runtime_error("Invalid field ID."));
 }
 
-Object::Ptr Object::NavigateField(int id) const
+Object::Ptr Object::NavigateField([[maybe_unused]] int id) const
 {
 	BOOST_THROW_EXCEPTION(std::runtime_error("Invalid field ID."));
 }
diff --git a/lib/base/scriptutils.cpp b/lib/base/scriptutils.cpp
index c12bb0169..13f40a810 100644
--- a/lib/base/scriptutils.cpp
+++ b/lib/base/scriptutils.cpp
@@ -500,9 +500,9 @@ void ScriptUtils::Assert(const Value& arg)
 		BOOST_THROW_EXCEPTION(std::runtime_error("Assertion failed"));
 }
 
+#ifdef _WIN32
 String ScriptUtils::MsiGetComponentPathShim(const String& component)
 {
-#ifdef _WIN32
 	TCHAR productCode[39];
 	if (MsiGetProductCode(component.CStr(), productCode) != ERROR_SUCCESS)
 		return "";
@@ -511,10 +511,13 @@ String ScriptUtils::MsiGetComponentPathShim(const String& component)
 	path[0] = '\0';
 	MsiGetComponentPath(productCode, component.CStr(), path, &szPath);
 	return path;
-#else /* _WIN32 */
-	return String();
-#endif /* _WIN32 */
 }
+#else /* _WIN32 */
+String ScriptUtils::MsiGetComponentPathShim([[maybe_unused]] const String& component)
+{
+	return String();
+}
+#endif /* _WIN32 */
 
 double ScriptUtils::Ptr(const Object::Ptr& object)
 {
diff --git a/lib/base/type.cpp b/lib/base/type.cpp
index f6539b7c4..25249b7f7 100644
--- a/lib/base/type.cpp
+++ b/lib/base/type.cpp
@@ -202,7 +202,7 @@ int Type::GetActivationPriority() const
 	return 0;
 }
 
-void Type::RegisterAttributeHandler(int fieldId, const AttributeHandler& callback)
+void Type::RegisterAttributeHandler([[maybe_unused]] int fieldId, const AttributeHandler&)
 {
 	throw std::runtime_error("Invalid field ID.");
 }
diff --git a/lib/base/typetype-script.cpp b/lib/base/typetype-script.cpp
index 5be124c94..6a07800c2 100644
--- a/lib/base/typetype-script.cpp
+++ b/lib/base/typetype-script.cpp
@@ -15,7 +15,7 @@ static void TypeRegisterAttributeHandler(const String& fieldName, const Function
 	REQUIRE_NOT_NULL(self);
 
 	int fid = self->GetFieldId(fieldName);
-	self->RegisterAttributeHandler(fid, [callback](const Object::Ptr& object, const Value& cookie) {
+	self->RegisterAttributeHandler(fid, [callback](const Object::Ptr& object, [[maybe_unused]] const Value& cookie) {
 		callback->Invoke({ object });
 	});
 }
diff --git a/lib/base/utility.cpp b/lib/base/utility.cpp
index 2b4e32def..e2c5a32a1 100644
--- a/lib/base/utility.cpp
+++ b/lib/base/utility.cpp
@@ -430,7 +430,7 @@ static bool GlobHelper(const String& pathSpec, int type, std::vector<String>& fi
 #endif /* _WIN32 */
 
 #ifndef _WIN32
-static int GlobErrorHandler(const char *epath, int eerrno)
+static int GlobErrorHandler([[maybe_unused]] const char *epath, int eerrno)
 {
 	if (eerrno == ENOTDIR)
 		return 0;
diff --git a/lib/cli/apisetupcommand.cpp b/lib/cli/apisetupcommand.cpp
index 81b9d8db6..e97210c7d 100644
--- a/lib/cli/apisetupcommand.cpp
+++ b/lib/cli/apisetupcommand.cpp
@@ -28,7 +28,7 @@ ImpersonationLevel ApiSetupCommand::GetImpersonationLevel() const
 }
 
 void ApiSetupCommand::InitParameters(boost::program_options::options_description& visibleDesc,
-	boost::program_options::options_description& hiddenDesc) const
+	[[maybe_unused]] boost::program_options::options_description& hiddenDesc) const
 {
 	visibleDesc.add_options()
 		("cn", po::value<std::string>(), "The certificate's common name");
@@ -39,7 +39,7 @@ void ApiSetupCommand::InitParameters(boost::program_options::options_description
  *
  * @returns An exit status.
  */
-int ApiSetupCommand::Run(const boost::program_options::variables_map& vm, const std::vector<std::string>& ap) const
+int ApiSetupCommand::Run(const boost::program_options::variables_map& vm, [[maybe_unused]] const std::vector<std::string>& ap) const
 {
 	String cn;
 
diff --git a/lib/cli/calistcommand.cpp b/lib/cli/calistcommand.cpp
index f693ad72f..cbb045390 100644
--- a/lib/cli/calistcommand.cpp
+++ b/lib/cli/calistcommand.cpp
@@ -41,7 +41,7 @@ String CAListCommand::GetShortDescription() const
  * @param hiddenDesc Register hidden parameters.
  */
 void CAListCommand::InitParameters(boost::program_options::options_description& visibleDesc,
-	boost::program_options::options_description& hiddenDesc) const
+	[[maybe_unused]] boost::program_options::options_description& hiddenDesc) const
 {
 	visibleDesc.add_options()
 		("all", "List all certificate signing requests, including signed. Note: Old requests are automatically cleaned by Icinga after 1 week.")
@@ -54,7 +54,7 @@ void CAListCommand::InitParameters(boost::program_options::options_description&
  *
  * @return An exit status.
  */
-int CAListCommand::Run(const boost::program_options::variables_map& vm, const std::vector<std::string>& ap) const
+int CAListCommand::Run(const boost::program_options::variables_map& vm, [[maybe_unused]] const std::vector<std::string>& ap) const
 {
 	Dictionary::Ptr requests = PkiUtility::GetCertificateRequests(vm.count("removed"));
 
diff --git a/lib/cli/caremovecommand.cpp b/lib/cli/caremovecommand.cpp
index d8944944e..894816d6f 100644
--- a/lib/cli/caremovecommand.cpp
+++ b/lib/cli/caremovecommand.cpp
@@ -55,7 +55,7 @@ ImpersonationLevel CARemoveCommand::GetImpersonationLevel() const
  *
  * @returns An exit status.
  */
-int CARemoveCommand::Run(const boost::program_options::variables_map& vm, const std::vector<std::string>& ap) const
+int CARemoveCommand::Run(const boost::program_options::variables_map&, const std::vector<std::string>& ap) const
 {
 	String fingerPrint = ap[0];
 	String requestFile = ApiListener::GetCertificateRequestsDir() + "/" + fingerPrint + ".json";
diff --git a/lib/cli/carestorecommand.cpp b/lib/cli/carestorecommand.cpp
index 502036830..a1b1c5b76 100644
--- a/lib/cli/carestorecommand.cpp
+++ b/lib/cli/carestorecommand.cpp
@@ -55,7 +55,7 @@ ImpersonationLevel CARestoreCommand::GetImpersonationLevel() const
  *
  * @returns An exit status.
  */
-int CARestoreCommand::Run(const boost::program_options::variables_map& vm, const std::vector<std::string>& ap) const
+int CARestoreCommand::Run(const boost::program_options::variables_map&, const std::vector<std::string>& ap) const
 {
 	String fingerPrint = ap[0];
 	String removedRequestFile = ApiListener::GetCertificateRequestsDir() + "/" + fingerPrint + ".removed";
diff --git a/lib/cli/casigncommand.cpp b/lib/cli/casigncommand.cpp
index 96d2c2c87..789e1f5db 100644
--- a/lib/cli/casigncommand.cpp
+++ b/lib/cli/casigncommand.cpp
@@ -55,7 +55,7 @@ ImpersonationLevel CASignCommand::GetImpersonationLevel() const
  *
  * @return An exit status.
  */
-int CASignCommand::Run(const boost::program_options::variables_map& vm, const std::vector<std::string>& ap) const
+int CASignCommand::Run(const boost::program_options::variables_map&, const std::vector<std::string>& ap) const
 {
 	String requestFile = ApiListener::GetCertificateRequestsDir() + "/" + ap[0] + ".json";
 
diff --git a/lib/cli/clicommand.cpp b/lib/cli/clicommand.cpp
index cfdce0946..b4b31b81d 100644
--- a/lib/cli/clicommand.cpp
+++ b/lib/cli/clicommand.cpp
@@ -131,18 +131,18 @@ void CLICommand::Unregister(const std::vector<String>& name)
 	GetRegistry().erase(name);
 }
 
-std::vector<String> CLICommand::GetArgumentSuggestions(const String& argument, const String& word) const
+std::vector<String> CLICommand::GetArgumentSuggestions([[maybe_unused]] const String& argument, [[maybe_unused]] const String& word) const
 {
 	return std::vector<String>();
 }
 
-std::vector<String> CLICommand::GetPositionalSuggestions(const String& word) const
+std::vector<String> CLICommand::GetPositionalSuggestions([[maybe_unused]] const String& word) const
 {
 	return std::vector<String>();
 }
 
-void CLICommand::InitParameters(boost::program_options::options_description& visibleDesc,
-	boost::program_options::options_description& hiddenDesc) const
+void CLICommand::InitParameters([[maybe_unused]] boost::program_options::options_description& visibleDesc,
+	[[maybe_unused]] boost::program_options::options_description& hiddenDesc) const
 { }
 
 ImpersonationLevel CLICommand::GetImpersonationLevel() const
diff --git a/lib/cli/consolecommand.cpp b/lib/cli/consolecommand.cpp
index 78906bb2a..34ee4c13b 100644
--- a/lib/cli/consolecommand.cpp
+++ b/lib/cli/consolecommand.cpp
@@ -167,7 +167,7 @@ ImpersonationLevel ConsoleCommand::GetImpersonationLevel() const
 }
 
 void ConsoleCommand::InitParameters(boost::program_options::options_description& visibleDesc,
-	boost::program_options::options_description& hiddenDesc) const
+	[[maybe_unused]] boost::program_options::options_description& hiddenDesc) const
 {
 	visibleDesc.add_options()
 		("connect,c", po::value<std::string>(), "connect to an Icinga 2 instance")
@@ -215,7 +215,7 @@ char *ConsoleCommand::ConsoleCompleteHelper(const char *word, int state)
  *
  * @returns An exit status.
  */
-int ConsoleCommand::Run(const po::variables_map& vm, const std::vector<std::string>& ap) const
+int ConsoleCommand::Run(const po::variables_map& vm, [[maybe_unused]] const std::vector<std::string>& ap) const
 {
 #ifdef HAVE_EDITLINE
 	rl_completion_entry_function = ConsoleCommand::ConsoleCompleteHelper;
diff --git a/lib/cli/daemoncommand.cpp b/lib/cli/daemoncommand.cpp
index 3a9ce8c0a..80d6dcb8e 100644
--- a/lib/cli/daemoncommand.cpp
+++ b/lib/cli/daemoncommand.cpp
@@ -46,13 +46,18 @@ static po::variables_map g_AppParams;
 
 REGISTER_CLICOMMAND("daemon", DaemonCommand);
 
+#ifdef HAVE_SYSTEMD
 static inline
 void NotifyStatus(const char* status)
 {
-#ifdef HAVE_SYSTEMD
 	(void)sd_notifyf(0, "STATUS=%s", status);
-#endif /* HAVE_SYSTEMD */
 }
+#else /* HAVE_SYSTEMD */
+static inline
+void NotifyStatus(const char*)
+{
+}
+#endif /* HAVE_SYSTEMD */
 
 /*
  * Daemonize().  On error, this function logs by itself and exits (i.e. does not return).
@@ -171,7 +176,7 @@ String DaemonCommand::GetShortDescription() const
 }
 
 void DaemonCommand::InitParameters(boost::program_options::options_description& visibleDesc,
-	boost::program_options::options_description& hiddenDesc) const
+	[[maybe_unused]] boost::program_options::options_description& hiddenDesc) const
 {
 	visibleDesc.add_options()
 		("config,c", po::value<std::vector<std::string> >(), "parse a configuration file")
@@ -614,7 +619,7 @@ public:
  *
  * @returns An exit status.
  */
-int DaemonCommand::Run(const po::variables_map& vm, const std::vector<std::string>& ap) const
+int DaemonCommand::Run(const po::variables_map& vm, [[maybe_unused]] const std::vector<std::string>& ap) const
 {
 #ifdef _WIN32
 	SetConsoleOutputCP(65001);
diff --git a/lib/cli/featuredisablecommand.cpp b/lib/cli/featuredisablecommand.cpp
index 95a4a26d7..6fb6045fa 100644
--- a/lib/cli/featuredisablecommand.cpp
+++ b/lib/cli/featuredisablecommand.cpp
@@ -44,7 +44,7 @@ ImpersonationLevel FeatureDisableCommand::GetImpersonationLevel() const
  *
  * @returns An exit status.
  */
-int FeatureDisableCommand::Run(const boost::program_options::variables_map& vm, const std::vector<std::string>& ap) const
+int FeatureDisableCommand::Run(const boost::program_options::variables_map&, const std::vector<std::string>& ap) const
 {
 	if (ap.empty()) {
 		Log(LogCritical, "cli", "Cannot disable feature(s). Name(s) are missing!");
diff --git a/lib/cli/featureenablecommand.cpp b/lib/cli/featureenablecommand.cpp
index 0cf906648..211c2fbca 100644
--- a/lib/cli/featureenablecommand.cpp
+++ b/lib/cli/featureenablecommand.cpp
@@ -44,7 +44,7 @@ ImpersonationLevel FeatureEnableCommand::GetImpersonationLevel() const
  *
  * @returns An exit status.
  */
-int FeatureEnableCommand::Run(const boost::program_options::variables_map& vm, const std::vector<std::string>& ap) const
+int FeatureEnableCommand::Run(const boost::program_options::variables_map&, const std::vector<std::string>& ap) const
 {
 	return FeatureUtility::EnableFeatures(ap);
 }
diff --git a/lib/cli/featurelistcommand.cpp b/lib/cli/featurelistcommand.cpp
index 2aad4a9cd..f5442115b 100644
--- a/lib/cli/featurelistcommand.cpp
+++ b/lib/cli/featurelistcommand.cpp
@@ -28,7 +28,7 @@ String FeatureListCommand::GetShortDescription() const
  *
  * @returns An exit status.
  */
-int FeatureListCommand::Run(const boost::program_options::variables_map& vm, const std::vector<std::string>& ap) const
+int FeatureListCommand::Run(const boost::program_options::variables_map&, [[maybe_unused]] const std::vector<std::string>& ap) const
 {
 	return FeatureUtility::ListFeatures();
 }
diff --git a/lib/cli/internalsignalcommand.cpp b/lib/cli/internalsignalcommand.cpp
index b98e6c621..6e7d0570f 100644
--- a/lib/cli/internalsignalcommand.cpp
+++ b/lib/cli/internalsignalcommand.cpp
@@ -30,7 +30,7 @@ bool InternalSignalCommand::IsHidden() const
 }
 
 void InternalSignalCommand::InitParameters(boost::program_options::options_description& visibleDesc,
-	boost::program_options::options_description& hiddenDesc) const
+	[[maybe_unused]] boost::program_options::options_description& hiddenDesc) const
 {
 	visibleDesc.add_options()
 		("pid,p", po::value<int>(), "Target PID")
@@ -43,7 +43,7 @@ void InternalSignalCommand::InitParameters(boost::program_options::options_descr
  *
  * @returns An exit status.
  */
-int InternalSignalCommand::Run(const boost::program_options::variables_map& vm, const std::vector<std::string>& ap) const
+int InternalSignalCommand::Run(const boost::program_options::variables_map& vm, [[maybe_unused]] const std::vector<std::string>& ap) const
 {
 #ifndef _WIN32
 	String signal = vm["sig"].as<String>();
diff --git a/lib/cli/nodewizardcommand.cpp b/lib/cli/nodewizardcommand.cpp
index c6874a5af..310c23b56 100644
--- a/lib/cli/nodewizardcommand.cpp
+++ b/lib/cli/nodewizardcommand.cpp
@@ -47,7 +47,7 @@ int NodeWizardCommand::GetMaxArguments() const
 }
 
 void NodeWizardCommand::InitParameters(boost::program_options::options_description& visibleDesc,
-	boost::program_options::options_description& hiddenDesc) const
+	[[maybe_unused]] boost::program_options::options_description& hiddenDesc) const
 {
 	visibleDesc.add_options()
 		("verbose", "increase log level");
@@ -59,7 +59,7 @@ void NodeWizardCommand::InitParameters(boost::program_options::options_descripti
  * @returns An exit status.
  */
 int NodeWizardCommand::Run(const boost::program_options::variables_map& vm,
-	const std::vector<std::string>& ap) const
+	[[maybe_unused]] const std::vector<std::string>& ap) const
 {
 	if (!vm.count("verbose"))
 		Logger::SetConsoleLogSeverity(LogCritical);
diff --git a/lib/cli/objectlistcommand.cpp b/lib/cli/objectlistcommand.cpp
index 3bcb31512..6eef7ac82 100644
--- a/lib/cli/objectlistcommand.cpp
+++ b/lib/cli/objectlistcommand.cpp
@@ -36,7 +36,7 @@ String ObjectListCommand::GetShortDescription() const
 }
 
 void ObjectListCommand::InitParameters(boost::program_options::options_description& visibleDesc,
-	boost::program_options::options_description& hiddenDesc) const
+	[[maybe_unused]] boost::program_options::options_description& hiddenDesc) const
 {
 	visibleDesc.add_options()
 		("count,c", "display object counts by types")
@@ -62,7 +62,7 @@ static time_t GetCtime(const String& path)
  *
  * @returns An exit status.
  */
-int ObjectListCommand::Run(const boost::program_options::variables_map& vm, const std::vector<std::string>& ap) const
+int ObjectListCommand::Run(const boost::program_options::variables_map& vm, [[maybe_unused]] const std::vector<std::string>& ap) const
 {
 	String objectfile = Configuration::ObjectsPath;
 
diff --git a/lib/cli/pkinewcacommand.cpp b/lib/cli/pkinewcacommand.cpp
index eba08c69f..eaaf73fa3 100644
--- a/lib/cli/pkinewcacommand.cpp
+++ b/lib/cli/pkinewcacommand.cpp
@@ -23,7 +23,7 @@ String PKINewCACommand::GetShortDescription() const
  *
  * @returns An exit status.
  */
-int PKINewCACommand::Run(const boost::program_options::variables_map& vm, const std::vector<std::string>& ap) const
+int PKINewCACommand::Run(const boost::program_options::variables_map&, [[maybe_unused]] const std::vector<std::string>& ap) const
 {
 	return PkiUtility::NewCa();
 }
diff --git a/lib/cli/pkinewcertcommand.cpp b/lib/cli/pkinewcertcommand.cpp
index 5201d9239..afb5475d6 100644
--- a/lib/cli/pkinewcertcommand.cpp
+++ b/lib/cli/pkinewcertcommand.cpp
@@ -20,7 +20,7 @@ String PKINewCertCommand::GetShortDescription() const
 }
 
 void PKINewCertCommand::InitParameters(boost::program_options::options_description& visibleDesc,
-	boost::program_options::options_description& hiddenDesc) const
+	[[maybe_unused]] boost::program_options::options_description& hiddenDesc) const
 {
 	visibleDesc.add_options()
 		("cn", po::value<std::string>(), "Common Name")
@@ -42,7 +42,7 @@ std::vector<String> PKINewCertCommand::GetArgumentSuggestions(const String& argu
  *
  * @returns An exit status.
  */
-int PKINewCertCommand::Run(const boost::program_options::variables_map& vm, const std::vector<std::string>& ap) const
+int PKINewCertCommand::Run(const boost::program_options::variables_map& vm, [[maybe_unused]] const std::vector<std::string>& ap) const
 {
 	if (!vm.count("cn")) {
 		Log(LogCritical, "cli", "Common name (--cn) must be specified.");
diff --git a/lib/cli/pkirequestcommand.cpp b/lib/cli/pkirequestcommand.cpp
index d2b79f0a9..865533b85 100644
--- a/lib/cli/pkirequestcommand.cpp
+++ b/lib/cli/pkirequestcommand.cpp
@@ -22,7 +22,7 @@ String PKIRequestCommand::GetShortDescription() const
 }
 
 void PKIRequestCommand::InitParameters(boost::program_options::options_description& visibleDesc,
-	boost::program_options::options_description& hiddenDesc) const
+	[[maybe_unused]] boost::program_options::options_description& hiddenDesc) const
 {
 	visibleDesc.add_options()
 		("key", po::value<std::string>(), "Key file path (input)")
@@ -51,7 +51,7 @@ std::vector<String> PKIRequestCommand::GetArgumentSuggestions(const String& argu
  *
  * @returns An exit status.
  */
-int PKIRequestCommand::Run(const boost::program_options::variables_map& vm, const std::vector<std::string>& ap) const
+int PKIRequestCommand::Run(const boost::program_options::variables_map& vm, [[maybe_unused]] const std::vector<std::string>& ap) const
 {
 	if (!vm.count("host")) {
 		Log(LogCritical, "cli", "Icinga 2 host (--host) must be specified.");
diff --git a/lib/cli/pkisavecertcommand.cpp b/lib/cli/pkisavecertcommand.cpp
index befd0eead..9910fa48d 100644
--- a/lib/cli/pkisavecertcommand.cpp
+++ b/lib/cli/pkisavecertcommand.cpp
@@ -52,7 +52,7 @@ std::vector<String> PKISaveCertCommand::GetArgumentSuggestions(const String& arg
  *
  * @returns An exit status.
  */
-int PKISaveCertCommand::Run(const boost::program_options::variables_map& vm, const std::vector<std::string>& ap) const
+int PKISaveCertCommand::Run(const boost::program_options::variables_map& vm, [[maybe_unused]] const std::vector<std::string>& ap) const
 {
 	if (!vm.count("host")) {
 		Log(LogCritical, "cli", "Icinga 2 host (--host) must be specified.");
diff --git a/lib/cli/pkisigncsrcommand.cpp b/lib/cli/pkisigncsrcommand.cpp
index ce1427bcd..ab645c547 100644
--- a/lib/cli/pkisigncsrcommand.cpp
+++ b/lib/cli/pkisigncsrcommand.cpp
@@ -20,7 +20,7 @@ String PKISignCSRCommand::GetShortDescription() const
 }
 
 void PKISignCSRCommand::InitParameters(boost::program_options::options_description& visibleDesc,
-	boost::program_options::options_description& hiddenDesc) const
+	[[maybe_unused]] boost::program_options::options_description& hiddenDesc) const
 {
 	visibleDesc.add_options()
 		("csr", po::value<std::string>(), "CSR file path (input)")
@@ -40,7 +40,7 @@ std::vector<String> PKISignCSRCommand::GetArgumentSuggestions(const String& argu
  *
  * @returns An exit status.
  */
-int PKISignCSRCommand::Run(const boost::program_options::variables_map& vm, const std::vector<std::string>& ap) const
+int PKISignCSRCommand::Run(const boost::program_options::variables_map& vm, [[maybe_unused]] const std::vector<std::string>& ap) const
 {
 	if (!vm.count("csr")) {
 		Log(LogCritical, "cli", "Certificate signing request file path (--csr) must be specified.");
diff --git a/lib/cli/pkiticketcommand.cpp b/lib/cli/pkiticketcommand.cpp
index 82f3586f0..c4002c13e 100644
--- a/lib/cli/pkiticketcommand.cpp
+++ b/lib/cli/pkiticketcommand.cpp
@@ -22,7 +22,7 @@ String PKITicketCommand::GetShortDescription() const
 }
 
 void PKITicketCommand::InitParameters(boost::program_options::options_description& visibleDesc,
-	boost::program_options::options_description& hiddenDesc) const
+	[[maybe_unused]] boost::program_options::options_description& hiddenDesc) const
 {
 	visibleDesc.add_options()
 		("cn", po::value<std::string>(), "Certificate common name")
@@ -34,7 +34,7 @@ void PKITicketCommand::InitParameters(boost::program_options::options_descriptio
  *
  * @returns An exit status.
  */
-int PKITicketCommand::Run(const boost::program_options::variables_map& vm, const std::vector<std::string>& ap) const
+int PKITicketCommand::Run(const boost::program_options::variables_map& vm, [[maybe_unused]] const std::vector<std::string>& ap) const
 {
 	if (!vm.count("cn")) {
 		Log(LogCritical, "cli", "Common name (--cn) must be specified.");
diff --git a/lib/cli/pkiverifycommand.cpp b/lib/cli/pkiverifycommand.cpp
index 963903a21..791e07c81 100644
--- a/lib/cli/pkiverifycommand.cpp
+++ b/lib/cli/pkiverifycommand.cpp
@@ -23,7 +23,7 @@ String PKIVerifyCommand::GetShortDescription() const
 }
 
 void PKIVerifyCommand::InitParameters(boost::program_options::options_description& visibleDesc,
-	boost::program_options::options_description& hiddenDesc) const
+	[[maybe_unused]] boost::program_options::options_description& hiddenDesc) const
 {
 	visibleDesc.add_options()
 		("cn", po::value<std::string>(), "Common Name (optional). Use with '--cert' to check the CN in the certificate.")
@@ -45,7 +45,7 @@ std::vector<String> PKIVerifyCommand::GetArgumentSuggestions(const String& argum
  *
  * @returns An exit status.
  */
-int PKIVerifyCommand::Run(const boost::program_options::variables_map& vm, const std::vector<std::string>& ap) const
+int PKIVerifyCommand::Run(const boost::program_options::variables_map& vm, [[maybe_unused]] const std::vector<std::string>& ap) const
 {
 	String cn, certFile, caCertFile, crlFile;
 
diff --git a/lib/cli/variablegetcommand.cpp b/lib/cli/variablegetcommand.cpp
index c05ac965a..3c843a380 100644
--- a/lib/cli/variablegetcommand.cpp
+++ b/lib/cli/variablegetcommand.cpp
@@ -35,7 +35,7 @@ String VariableGetCommand::GetShortDescription() const
 }
 
 void VariableGetCommand::InitParameters(boost::program_options::options_description& visibleDesc,
-	boost::program_options::options_description& hiddenDesc) const
+	[[maybe_unused]] boost::program_options::options_description& hiddenDesc) const
 {
 	visibleDesc.add_options()
 		("current", "Uses the current value (i.e. from the running process, rather than from the vars file)");
diff --git a/lib/cli/variablelistcommand.cpp b/lib/cli/variablelistcommand.cpp
index 5ec1919c0..fd666c57d 100644
--- a/lib/cli/variablelistcommand.cpp
+++ b/lib/cli/variablelistcommand.cpp
@@ -34,7 +34,7 @@ String VariableListCommand::GetShortDescription() const
  *
  * @returns An exit status.
  */
-int VariableListCommand::Run(const boost::program_options::variables_map& vm, const std::vector<std::string>& ap) const
+int VariableListCommand::Run(const boost::program_options::variables_map&, [[maybe_unused]] const std::vector<std::string>& ap) const
 {
 	String varsfile = Configuration::VarsPath;
 
diff --git a/lib/config/expression.cpp b/lib/config/expression.cpp
index 09b860cde..e4f3f1a93 100644
--- a/lib/config/expression.cpp
+++ b/lib/config/expression.cpp
@@ -63,7 +63,7 @@ ExpressionResult Expression::Evaluate(ScriptFrame& frame, DebugHint *dhint) cons
 	}
 }
 
-bool Expression::GetReference(ScriptFrame& frame, bool init_dict, Value *parent, String *index, DebugHint **dhint) const
+bool Expression::GetReference(ScriptFrame&, [[maybe_unused]] bool init_dict, [[maybe_unused]] Value* parent, [[maybe_unused]] String* index, DebugHint**) const
 {
 	return false;
 }
@@ -89,7 +89,7 @@ LiteralExpression::LiteralExpression(Value value)
 	: m_Value(std::move(value))
 { }
 
-ExpressionResult LiteralExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint) const
+ExpressionResult LiteralExpression::DoEvaluate(ScriptFrame&, DebugHint*) const
 {
 	return m_Value;
 }
@@ -108,7 +108,7 @@ VariableExpression::VariableExpression(String variable, std::vector<Expression::
 	m_Imports.push_back(MakeIndexer(ScopeGlobal, "Icinga").release());
 }
 
-ExpressionResult VariableExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint) const
+ExpressionResult VariableExpression::DoEvaluate(ScriptFrame& frame, DebugHint*) const
 {
 	Value value;
 
@@ -122,7 +122,7 @@ ExpressionResult VariableExpression::DoEvaluate(ScriptFrame& frame, DebugHint *d
 		return ScriptGlobal::Get(m_Variable);
 }
 
-bool VariableExpression::GetReference(ScriptFrame& frame, bool init_dict, Value *parent, String *index, DebugHint **dhint) const
+bool VariableExpression::GetReference(ScriptFrame& frame, [[maybe_unused]] bool init_dict, Value *parent, String *index, DebugHint **dhint) const
 {
 	*index = m_Variable;
 
@@ -163,7 +163,7 @@ ExpressionResult RefExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint)
 	return new Reference(parent, index);
 }
 
-ExpressionResult DerefExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint) const
+ExpressionResult DerefExpression::DoEvaluate(ScriptFrame& frame, DebugHint*) const
 {
 	ExpressionResult operand = m_Operand->Evaluate(frame);
 	CHECK_RESULT(operand);
@@ -177,7 +177,7 @@ ExpressionResult DerefExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhin
 	return ref->Get();
 }
 
-bool DerefExpression::GetReference(ScriptFrame& frame, bool init_dict, Value *parent, String *index, DebugHint **dhint) const
+bool DerefExpression::GetReference(ScriptFrame& frame, [[maybe_unused]] bool init_dict, Value *parent, String *index, DebugHint**) const
 {
 	ExpressionResult operand = m_Operand->Evaluate(frame);
 	if (operand.GetCode() != ResultOK)
@@ -190,7 +190,7 @@ bool DerefExpression::GetReference(ScriptFrame& frame, bool init_dict, Value *pa
 	return true;
 }
 
-ExpressionResult NegateExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint) const
+ExpressionResult NegateExpression::DoEvaluate(ScriptFrame& frame, DebugHint*) const
 {
 	ExpressionResult operand = m_Operand->Evaluate(frame);
 	CHECK_RESULT(operand);
@@ -198,7 +198,7 @@ ExpressionResult NegateExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhi
 	return ~(long)operand.GetValue();
 }
 
-ExpressionResult LogicalNegateExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint) const
+ExpressionResult LogicalNegateExpression::DoEvaluate(ScriptFrame& frame, DebugHint*) const
 {
 	ExpressionResult operand = m_Operand->Evaluate(frame);
 	CHECK_RESULT(operand);
@@ -206,7 +206,7 @@ ExpressionResult LogicalNegateExpression::DoEvaluate(ScriptFrame& frame, DebugHi
 	return !operand.GetValue().ToBool();
 }
 
-ExpressionResult AddExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint) const
+ExpressionResult AddExpression::DoEvaluate(ScriptFrame& frame, DebugHint*) const
 {
 	ExpressionResult operand1 = m_Operand1->Evaluate(frame);
 	CHECK_RESULT(operand1);
@@ -217,7 +217,7 @@ ExpressionResult AddExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint)
 	return operand1.GetValue() + operand2.GetValue();
 }
 
-ExpressionResult SubtractExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint) const
+ExpressionResult SubtractExpression::DoEvaluate(ScriptFrame& frame, DebugHint*) const
 {
 	ExpressionResult operand1 = m_Operand1->Evaluate(frame);
 	CHECK_RESULT(operand1);
@@ -228,7 +228,7 @@ ExpressionResult SubtractExpression::DoEvaluate(ScriptFrame& frame, DebugHint *d
 	return operand1.GetValue() - operand2.GetValue();
 }
 
-ExpressionResult MultiplyExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint) const
+ExpressionResult MultiplyExpression::DoEvaluate(ScriptFrame& frame, DebugHint*) const
 {
 	ExpressionResult operand1 = m_Operand1->Evaluate(frame);
 	CHECK_RESULT(operand1);
@@ -239,7 +239,7 @@ ExpressionResult MultiplyExpression::DoEvaluate(ScriptFrame& frame, DebugHint *d
 	return operand1.GetValue() * operand2.GetValue();
 }
 
-ExpressionResult DivideExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint) const
+ExpressionResult DivideExpression::DoEvaluate(ScriptFrame& frame, DebugHint*) const
 {
 	ExpressionResult operand1 = m_Operand1->Evaluate(frame);
 	CHECK_RESULT(operand1);
@@ -250,7 +250,7 @@ ExpressionResult DivideExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhi
 	return operand1.GetValue() / operand2.GetValue();
 }
 
-ExpressionResult ModuloExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint) const
+ExpressionResult ModuloExpression::DoEvaluate(ScriptFrame& frame, DebugHint*) const
 {
 	ExpressionResult operand1 = m_Operand1->Evaluate(frame);
 	CHECK_RESULT(operand1);
@@ -261,7 +261,7 @@ ExpressionResult ModuloExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhi
 	return operand1.GetValue() % operand2.GetValue();
 }
 
-ExpressionResult XorExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint) const
+ExpressionResult XorExpression::DoEvaluate(ScriptFrame& frame, DebugHint*) const
 {
 	ExpressionResult operand1 = m_Operand1->Evaluate(frame);
 	CHECK_RESULT(operand1);
@@ -272,7 +272,7 @@ ExpressionResult XorExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint)
 	return operand1.GetValue() ^ operand2.GetValue();
 }
 
-ExpressionResult BinaryAndExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint) const
+ExpressionResult BinaryAndExpression::DoEvaluate(ScriptFrame& frame, DebugHint*) const
 {
 	ExpressionResult operand1 = m_Operand1->Evaluate(frame);
 	CHECK_RESULT(operand1);
@@ -283,7 +283,7 @@ ExpressionResult BinaryAndExpression::DoEvaluate(ScriptFrame& frame, DebugHint *
 	return operand1.GetValue() & operand2.GetValue();
 }
 
-ExpressionResult BinaryOrExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint) const
+ExpressionResult BinaryOrExpression::DoEvaluate(ScriptFrame& frame, DebugHint*) const
 {
 	ExpressionResult operand1 = m_Operand1->Evaluate(frame);
 	CHECK_RESULT(operand1);
@@ -294,7 +294,7 @@ ExpressionResult BinaryOrExpression::DoEvaluate(ScriptFrame& frame, DebugHint *d
 	return operand1.GetValue() | operand2.GetValue();
 }
 
-ExpressionResult ShiftLeftExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint) const
+ExpressionResult ShiftLeftExpression::DoEvaluate(ScriptFrame& frame, DebugHint*) const
 {
 	ExpressionResult operand1 = m_Operand1->Evaluate(frame);
 	CHECK_RESULT(operand1);
@@ -305,7 +305,7 @@ ExpressionResult ShiftLeftExpression::DoEvaluate(ScriptFrame& frame, DebugHint *
 	return operand1.GetValue() << operand2.GetValue();
 }
 
-ExpressionResult ShiftRightExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint) const
+ExpressionResult ShiftRightExpression::DoEvaluate(ScriptFrame& frame, DebugHint*) const
 {
 	ExpressionResult operand1 = m_Operand1->Evaluate(frame);
 	CHECK_RESULT(operand1);
@@ -316,7 +316,7 @@ ExpressionResult ShiftRightExpression::DoEvaluate(ScriptFrame& frame, DebugHint
 	return operand1.GetValue() >> operand2.GetValue();
 }
 
-ExpressionResult EqualExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint) const
+ExpressionResult EqualExpression::DoEvaluate(ScriptFrame& frame, DebugHint*) const
 {
 	ExpressionResult operand1 = m_Operand1->Evaluate(frame);
 	CHECK_RESULT(operand1);
@@ -327,7 +327,7 @@ ExpressionResult EqualExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhin
 	return operand1.GetValue() == operand2.GetValue();
 }
 
-ExpressionResult NotEqualExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint) const
+ExpressionResult NotEqualExpression::DoEvaluate(ScriptFrame& frame, DebugHint*) const
 {
 	ExpressionResult operand1 = m_Operand1->Evaluate(frame);
 	CHECK_RESULT(operand1);
@@ -338,7 +338,7 @@ ExpressionResult NotEqualExpression::DoEvaluate(ScriptFrame& frame, DebugHint *d
 	return operand1.GetValue() != operand2.GetValue();
 }
 
-ExpressionResult LessThanExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint) const
+ExpressionResult LessThanExpression::DoEvaluate(ScriptFrame& frame, DebugHint*) const
 {
 	ExpressionResult operand1 = m_Operand1->Evaluate(frame);
 	CHECK_RESULT(operand1);
@@ -349,7 +349,7 @@ ExpressionResult LessThanExpression::DoEvaluate(ScriptFrame& frame, DebugHint *d
 	return operand1.GetValue() < operand2.GetValue();
 }
 
-ExpressionResult GreaterThanExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint) const
+ExpressionResult GreaterThanExpression::DoEvaluate(ScriptFrame& frame, DebugHint*) const
 {
 	ExpressionResult operand1 = m_Operand1->Evaluate(frame);
 	CHECK_RESULT(operand1);
@@ -360,7 +360,7 @@ ExpressionResult GreaterThanExpression::DoEvaluate(ScriptFrame& frame, DebugHint
 	return operand1.GetValue() > operand2.GetValue();
 }
 
-ExpressionResult LessThanOrEqualExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint) const
+ExpressionResult LessThanOrEqualExpression::DoEvaluate(ScriptFrame& frame, DebugHint*) const
 {
 	ExpressionResult operand1 = m_Operand1->Evaluate(frame);
 	CHECK_RESULT(operand1);
@@ -371,7 +371,7 @@ ExpressionResult LessThanOrEqualExpression::DoEvaluate(ScriptFrame& frame, Debug
 	return operand1.GetValue() <= operand2.GetValue();
 }
 
-ExpressionResult GreaterThanOrEqualExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint) const
+ExpressionResult GreaterThanOrEqualExpression::DoEvaluate(ScriptFrame& frame, DebugHint*) const
 {
 	ExpressionResult operand1 = m_Operand1->Evaluate(frame);
 	CHECK_RESULT(operand1);
@@ -382,7 +382,7 @@ ExpressionResult GreaterThanOrEqualExpression::DoEvaluate(ScriptFrame& frame, De
 	return operand1.GetValue() >= operand2.GetValue();
 }
 
-ExpressionResult InExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint) const
+ExpressionResult InExpression::DoEvaluate(ScriptFrame& frame, DebugHint*) const
 {
 	ExpressionResult operand2 = m_Operand2->Evaluate(frame);
 	CHECK_RESULT(operand2);
@@ -399,7 +399,7 @@ ExpressionResult InExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint)
 	return arr->Contains(operand1.GetValue());
 }
 
-ExpressionResult NotInExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint) const
+ExpressionResult NotInExpression::DoEvaluate(ScriptFrame& frame, DebugHint*) const
 {
 	ExpressionResult operand2 = m_Operand2->Evaluate(frame);
 	CHECK_RESULT(operand2);
@@ -416,7 +416,7 @@ ExpressionResult NotInExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhin
 	return !arr->Contains(operand1.GetValue());
 }
 
-ExpressionResult LogicalAndExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint) const
+ExpressionResult LogicalAndExpression::DoEvaluate(ScriptFrame& frame, DebugHint*) const
 {
 	ExpressionResult operand1 = m_Operand1->Evaluate(frame);
 	CHECK_RESULT(operand1);
@@ -431,7 +431,7 @@ ExpressionResult LogicalAndExpression::DoEvaluate(ScriptFrame& frame, DebugHint
 	}
 }
 
-ExpressionResult LogicalOrExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint) const
+ExpressionResult LogicalOrExpression::DoEvaluate(ScriptFrame& frame, DebugHint*) const
 {
 	ExpressionResult operand1 = m_Operand1->Evaluate(frame);
 	CHECK_RESULT(operand1);
@@ -446,7 +446,7 @@ ExpressionResult LogicalOrExpression::DoEvaluate(ScriptFrame& frame, DebugHint *
 	}
 }
 
-ExpressionResult FunctionCallExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint) const
+ExpressionResult FunctionCallExpression::DoEvaluate(ScriptFrame& frame, DebugHint*) const
 {
 	Value self, vfunc;
 	String index;
@@ -493,7 +493,7 @@ ExpressionResult FunctionCallExpression::DoEvaluate(ScriptFrame& frame, DebugHin
 	return VMOps::FunctionCall(frame, self, func, arguments);
 }
 
-ExpressionResult ArrayExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint) const
+ExpressionResult ArrayExpression::DoEvaluate(ScriptFrame& frame, DebugHint*) const
 {
 	ArrayData result;
 	result.reserve(m_Expressions.size());
@@ -539,7 +539,7 @@ ExpressionResult DictExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint
 	}
 }
 
-ExpressionResult GetScopeExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint) const
+ExpressionResult GetScopeExpression::DoEvaluate(ScriptFrame& frame, DebugHint*) const
 {
 	if (m_ScopeSpec == ScopeLocal)
 		return frame.Locals;
@@ -671,7 +671,7 @@ void SetExpression::SetOverrideFrozen()
 	m_OverrideFrozen = true;
 }
 
-ExpressionResult SetConstExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint) const
+ExpressionResult SetConstExpression::DoEvaluate(ScriptFrame& frame, DebugHint*) const
 {
 	auto globals = ScriptGlobal::GetGlobals();
 
@@ -716,7 +716,7 @@ ExpressionResult WhileExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhin
 	return Empty;
 }
 
-ExpressionResult ReturnExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint) const
+ExpressionResult ReturnExpression::DoEvaluate(ScriptFrame& frame, DebugHint*) const
 {
 	ExpressionResult operand = m_Operand->Evaluate(frame);
 	CHECK_RESULT(operand);
@@ -724,12 +724,12 @@ ExpressionResult ReturnExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhi
 	return ExpressionResult(operand.GetValue(), ResultReturn);
 }
 
-ExpressionResult BreakExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint) const
+ExpressionResult BreakExpression::DoEvaluate(ScriptFrame&, DebugHint*) const
 {
 	return ExpressionResult(Empty, ResultBreak);
 }
 
-ExpressionResult ContinueExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint) const
+ExpressionResult ContinueExpression::DoEvaluate(ScriptFrame&, DebugHint*) const
 {
 	return ExpressionResult(Empty, ResultContinue);
 }
@@ -844,7 +844,7 @@ void icinga::BindToScope(std::unique_ptr<Expression>& expr, ScopeSpecifier scope
 	}
 }
 
-ExpressionResult ThrowExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint) const
+ExpressionResult ThrowExpression::DoEvaluate(ScriptFrame& frame, DebugHint*) const
 {
 	ExpressionResult messageres = m_Message->Evaluate(frame);
 	CHECK_RESULT(messageres);
@@ -902,12 +902,12 @@ ExpressionResult ImportDefaultTemplatesExpression::DoEvaluate(ScriptFrame& frame
 	return Empty;
 }
 
-ExpressionResult FunctionExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint) const
+ExpressionResult FunctionExpression::DoEvaluate(ScriptFrame& frame, DebugHint*) const
 {
 	return VMOps::NewFunction(frame, m_Name, m_Args, m_ClosedVars, m_Expression);
 }
 
-ExpressionResult ApplyExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint) const
+ExpressionResult ApplyExpression::DoEvaluate(ScriptFrame& frame, DebugHint*) const
 {
 	if (frame.Sandboxed)
 		BOOST_THROW_EXCEPTION(ScriptError("Apply rules are not allowed in sandbox mode.", m_DebugInfo));
@@ -919,7 +919,7 @@ ExpressionResult ApplyExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhin
 		m_Package, m_FKVar, m_FVVar, m_FTerm, m_ClosedVars, m_IgnoreOnError, m_Expression, m_DebugInfo);
 }
 
-ExpressionResult NamespaceExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint) const
+ExpressionResult NamespaceExpression::DoEvaluate(ScriptFrame&, DebugHint*) const
 {
 	Namespace::Ptr ns = new Namespace(true);
 
@@ -1046,7 +1046,7 @@ ExpressionResult IncludeExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dh
 	return res;
 }
 
-ExpressionResult BreakpointExpression::DoEvaluate(ScriptFrame& frame, DebugHint *dhint) const
+ExpressionResult BreakpointExpression::DoEvaluate(ScriptFrame& frame, DebugHint*) const
 {
 	ScriptBreakpoint(frame, nullptr, GetDebugInfo());
 
diff --git a/lib/icinga/apiactions.cpp b/lib/icinga/apiactions.cpp
index a91c319ec..11533e640 100644
--- a/lib/icinga/apiactions.cpp
+++ b/lib/icinga/apiactions.cpp
@@ -588,16 +588,16 @@ Dictionary::Ptr ApiActions::RemoveDowntime(const ConfigObject::Ptr& object,
 	}
 }
 
-Dictionary::Ptr ApiActions::ShutdownProcess(const ConfigObject::Ptr& object,
-	const Dictionary::Ptr& params)
+Dictionary::Ptr ApiActions::ShutdownProcess(const ConfigObject::Ptr&,
+	[[maybe_unused]] const Dictionary::Ptr& params)
 {
 	Application::RequestShutdown();
 
 	return ApiActions::CreateResult(200, "Shutting down Icinga 2.");
 }
 
-Dictionary::Ptr ApiActions::RestartProcess(const ConfigObject::Ptr& object,
-	const Dictionary::Ptr& params)
+Dictionary::Ptr ApiActions::RestartProcess(const ConfigObject::Ptr&,
+	[[maybe_unused]] const Dictionary::Ptr& params)
 {
 	Application::RequestRestart();
 
diff --git a/lib/icinga/apievents.cpp b/lib/icinga/apievents.cpp
index 53008fdb1..c80ac942e 100644
--- a/lib/icinga/apievents.cpp
+++ b/lib/icinga/apievents.cpp
@@ -34,7 +34,7 @@ void ApiEvents::StaticInitialize()
 	ConfigObject::OnVersionChanged.connect(&ApiEvents::OnVersionChangedHandler);
 }
 
-void ApiEvents::CheckResultHandler(const Checkable::Ptr& checkable, const CheckResult::Ptr& cr, const MessageOrigin::Ptr& origin)
+void ApiEvents::CheckResultHandler(const Checkable::Ptr& checkable, const CheckResult::Ptr& cr, const MessageOrigin::Ptr&)
 {
 	std::vector<EventQueue::Ptr> queues = EventQueue::GetQueuesForType("CheckResult");
 	auto inboxes (EventsRouter::GetInstance().GetInboxes(EventType::CheckResult));
@@ -68,7 +68,7 @@ void ApiEvents::CheckResultHandler(const Checkable::Ptr& checkable, const CheckR
 	inboxes.Push(std::move(result));
 }
 
-void ApiEvents::StateChangeHandler(const Checkable::Ptr& checkable, const CheckResult::Ptr& cr, StateType type, const MessageOrigin::Ptr& origin)
+void ApiEvents::StateChangeHandler(const Checkable::Ptr& checkable, const CheckResult::Ptr& cr, StateType, const MessageOrigin::Ptr&)
 {
 	std::vector<EventQueue::Ptr> queues = EventQueue::GetQueuesForType("StateChange");
 	auto inboxes (EventsRouter::GetInstance().GetInboxes(EventType::StateChange));
@@ -106,7 +106,7 @@ void ApiEvents::StateChangeHandler(const Checkable::Ptr& checkable, const CheckR
 
 void ApiEvents::NotificationSentToAllUsersHandler(const Notification::Ptr& notification,
 	const Checkable::Ptr& checkable, const std::set<User::Ptr>& users, NotificationType type,
-	const CheckResult::Ptr& cr, const String& author, const String& text, const MessageOrigin::Ptr& origin)
+	const CheckResult::Ptr& cr, const String& author, const String& text, const MessageOrigin::Ptr&)
 {
 	std::vector<EventQueue::Ptr> queues = EventQueue::GetQueuesForType("Notification");
 	auto inboxes (EventsRouter::GetInstance().GetInboxes(EventType::Notification));
@@ -152,7 +152,7 @@ void ApiEvents::NotificationSentToAllUsersHandler(const Notification::Ptr& notif
 	inboxes.Push(std::move(result));
 }
 
-void ApiEvents::FlappingChangedHandler(const Checkable::Ptr& checkable, const MessageOrigin::Ptr& origin)
+void ApiEvents::FlappingChangedHandler(const Checkable::Ptr& checkable, const MessageOrigin::Ptr&)
 {
 	std::vector<EventQueue::Ptr> queues = EventQueue::GetQueuesForType("Flapping");
 	auto inboxes (EventsRouter::GetInstance().GetInboxes(EventType::Flapping));
@@ -190,7 +190,7 @@ void ApiEvents::FlappingChangedHandler(const Checkable::Ptr& checkable, const Me
 
 void ApiEvents::AcknowledgementSetHandler(const Checkable::Ptr& checkable,
 	const String& author, const String& comment, AcknowledgementType type,
-	bool notify, bool persistent, double, double expiry, const MessageOrigin::Ptr& origin)
+	bool notify, bool persistent, double, double expiry, const MessageOrigin::Ptr&)
 {
 	std::vector<EventQueue::Ptr> queues = EventQueue::GetQueuesForType("AcknowledgementSet");
 	auto inboxes (EventsRouter::GetInstance().GetInboxes(EventType::AcknowledgementSet));
@@ -229,7 +229,7 @@ void ApiEvents::AcknowledgementSetHandler(const Checkable::Ptr& checkable,
 	inboxes.Push(std::move(result));
 }
 
-void ApiEvents::AcknowledgementClearedHandler(const Checkable::Ptr& checkable, const String& removedBy, double, const MessageOrigin::Ptr& origin)
+void ApiEvents::AcknowledgementClearedHandler(const Checkable::Ptr& checkable, [[maybe_unused]] const String& removedBy, double, const MessageOrigin::Ptr&)
 {
 	std::vector<EventQueue::Ptr> queues = EventQueue::GetQueuesForType("AcknowledgementCleared");
 	auto inboxes (EventsRouter::GetInstance().GetInboxes(EventType::AcknowledgementCleared));
diff --git a/lib/icinga/cib.cpp b/lib/icinga/cib.cpp
index ce71a5992..ef7cd066c 100644
--- a/lib/icinga/cib.cpp
+++ b/lib/icinga/cib.cpp
@@ -277,7 +277,7 @@ std::pair<Dictionary::Ptr, Array::Ptr> CIB::GetFeatureStats()
 
 REGISTER_STATSFUNCTION(CIB, &CIB::StatsFunc);
 
-void CIB::StatsFunc(const Dictionary::Ptr& status, const Array::Ptr& perfdata) {
+void CIB::StatsFunc(const Dictionary::Ptr& status, [[maybe_unused]] const Array::Ptr& perfdata) {
 	double interval = Utility::GetTime() - Application::GetStartTime();
 
 	if (interval > 60)
diff --git a/lib/icinga/customvarobject.cpp b/lib/icinga/customvarobject.cpp
index 0edc369d9..ed64585fb 100644
--- a/lib/icinga/customvarobject.cpp
+++ b/lib/icinga/customvarobject.cpp
@@ -12,7 +12,7 @@ using namespace icinga;
 
 REGISTER_TYPE(CustomVarObject);
 
-void CustomVarObject::ValidateVars(const Lazy<Dictionary::Ptr>& lvalue, const ValidationUtils& utils)
+void CustomVarObject::ValidateVars(const Lazy<Dictionary::Ptr>& lvalue, const ValidationUtils&)
 {
 	MacroProcessor::ValidateCustomVars(this, lvalue());
 }
diff --git a/lib/icinga/icingaapplication.cpp b/lib/icinga/icingaapplication.cpp
index 94ae0ede7..abbc3a566 100644
--- a/lib/icinga/icingaapplication.cpp
+++ b/lib/icinga/icingaapplication.cpp
@@ -71,7 +71,7 @@ INITIALIZE_ONCE_WITH_PRIORITY([]() {
 
 REGISTER_STATSFUNCTION(IcingaApplication, &IcingaApplication::StatsFunc);
 
-void IcingaApplication::StatsFunc(const Dictionary::Ptr& status, const Array::Ptr& perfdata)
+void IcingaApplication::StatsFunc(const Dictionary::Ptr& status, [[maybe_unused]] const Array::Ptr& perfdata)
 {
 	DictionaryData nodes;
 
@@ -310,12 +310,12 @@ String IcingaApplication::GetEnvironment() const
 	return Application::GetAppEnvironment();
 }
 
-void IcingaApplication::SetEnvironment(const String& value, bool suppress_events, const Value& cookie)
+void IcingaApplication::SetEnvironment(const String& value, [[maybe_unused]] bool suppress_event, [[maybe_unused]] const Value& cookie)
 {
 	Application::SetAppEnvironment(value);
 }
 
-void IcingaApplication::ValidateVars(const Lazy<Dictionary::Ptr>& lvalue, const ValidationUtils& utils)
+void IcingaApplication::ValidateVars(const Lazy<Dictionary::Ptr>& lvalue, const ValidationUtils&)
 {
 	MacroProcessor::ValidateCustomVars(this, lvalue());
 }
diff --git a/lib/icinga/timeperiod.cpp b/lib/icinga/timeperiod.cpp
index d5188a68b..f046e1088 100644
--- a/lib/icinga/timeperiod.cpp
+++ b/lib/icinga/timeperiod.cpp
@@ -370,7 +370,7 @@ void TimePeriod::Dump()
 	Log(LogDebug, "TimePeriod", "---");
 }
 
-void TimePeriod::ValidateRanges(const Lazy<Dictionary::Ptr>& lvalue, const ValidationUtils& utils)
+void TimePeriod::ValidateRanges(const Lazy<Dictionary::Ptr>& lvalue, const ValidationUtils&)
 {
 	if (!lvalue())
 		return;
diff --git a/lib/icingadb/icingadb-objects.cpp b/lib/icingadb/icingadb-objects.cpp
index a8c2ed0b2..0cdd002be 100644
--- a/lib/icingadb/icingadb-objects.cpp
+++ b/lib/icingadb/icingadb-objects.cpp
@@ -529,7 +529,7 @@ void IcingaDB::UpdateAllConfigObjects()
 
 	// enqueue a callback that will notify us once all previous queries were executed and wait for this event
 	std::promise<void> p;
-	m_Rcon->EnqueueCallback([&p](boost::asio::yield_context& yc) { p.set_value(); }, Prio::Config);
+	m_Rcon->EnqueueCallback([&p](boost::asio::yield_context&) { p.set_value(); }, Prio::Config);
 	p.get_future().wait();
 
 	auto endTime (Utility::GetTime());
diff --git a/lib/icingadb/icingadb.cpp b/lib/icingadb/icingadb.cpp
index 8d3b9099b..0b0786d56 100644
--- a/lib/icingadb/icingadb.cpp
+++ b/lib/icingadb/icingadb.cpp
@@ -95,7 +95,7 @@ void IcingaDB::Start(bool runtimeCreated)
 			GetEnableTls(), GetInsecureNoverify(), GetCertPath(), GetKeyPath(), GetCaPath(), GetCrlPath(),
 			GetTlsProtocolmin(), GetCipherList(), GetConnectTimeout(), GetDebugInfo(), m_Rcon);
 
-		con->SetConnectedCallback([this, con](boost::asio::yield_context& yc) {
+		con->SetConnectedCallback([this, con](boost::asio::yield_context&) {
 			con->SetConnectedCallback(nullptr);
 
 			size_t pending = --m_PendingRcons;
@@ -110,7 +110,7 @@ void IcingaDB::Start(bool runtimeCreated)
 
 	m_PendingRcons = m_Rcons.size();
 
-	m_Rcon->SetConnectedCallback([this](boost::asio::yield_context& yc) {
+	m_Rcon->SetConnectedCallback([this](boost::asio::yield_context&) {
 		m_Rcon->SetConnectedCallback(nullptr);
 
 		for (auto& kv : m_Rcons) {
diff --git a/lib/methods/nulleventtask.cpp b/lib/methods/nulleventtask.cpp
index 3c02f234f..0a63905a1 100644
--- a/lib/methods/nulleventtask.cpp
+++ b/lib/methods/nulleventtask.cpp
@@ -8,7 +8,7 @@ using namespace icinga;
 
 REGISTER_FUNCTION_NONCONST(Internal, NullEvent, &NullEventTask::ScriptFunc, "checkable:resolvedMacros:useResolvedMacros");
 
-void NullEventTask::ScriptFunc(const Checkable::Ptr& checkable, const Dictionary::Ptr& resolvedMacros, bool useResolvedMacros)
+void NullEventTask::ScriptFunc(const Checkable::Ptr& checkable, [[maybe_unused]] const Dictionary::Ptr& resolvedMacros, [[maybe_unused]] bool useResolvedMacros)
 {
 	REQUIRE_NOT_NULL(checkable);
 
diff --git a/lib/remote/apilistener.cpp b/lib/remote/apilistener.cpp
index 547eadc7f..78e202136 100644
--- a/lib/remote/apilistener.cpp
+++ b/lib/remote/apilistener.cpp
@@ -111,7 +111,7 @@ double ApiListener::GetTlsHandshakeTimeout() const
 	return Configuration::TlsHandshakeTimeout;
 }
 
-void ApiListener::SetTlsHandshakeTimeout(double value, bool suppress_events, const Value& cookie)
+void ApiListener::SetTlsHandshakeTimeout(double value, [[maybe_unused]] bool suppress_events, [[maybe_unused]] const Value& cookie)
 {
 	Configuration::TlsHandshakeTimeout = value;
 }
diff --git a/lib/remote/jsonrpcconnection-heartbeat.cpp b/lib/remote/jsonrpcconnection-heartbeat.cpp
index 9b83c1363..03523afd4 100644
--- a/lib/remote/jsonrpcconnection-heartbeat.cpp
+++ b/lib/remote/jsonrpcconnection-heartbeat.cpp
@@ -41,7 +41,7 @@ void JsonRpcConnection::HandleAndWriteHeartbeats(boost::asio::yield_context yc)
 	}
 }
 
-Value JsonRpcConnection::HeartbeatAPIHandler(const MessageOrigin::Ptr& origin, const Dictionary::Ptr& params)
+Value JsonRpcConnection::HeartbeatAPIHandler(const MessageOrigin::Ptr&, [[maybe_unused]] const Dictionary::Ptr& params)
 {
 	return Empty;
 }
diff --git a/tools/mkclass/classcompiler.cpp b/tools/mkclass/classcompiler.cpp
index 755922816..bce31ef65 100644
--- a/tools/mkclass/classcompiler.cpp
+++ b/tools/mkclass/classcompiler.cpp
@@ -243,7 +243,7 @@ void ClassCompiler::HandleClass(const Klass& klass, const ClassDebugInfo&)
 	/* GetFieldId */
 	m_Header << "\t" << "int GetFieldId(const String& name) const override;" << std::endl;
 
-	m_Impl << "int TypeImpl<" << klass.Name << ">::GetFieldId(const String& name) const" << std::endl
+	m_Impl << "int TypeImpl<" << klass.Name << ">::GetFieldId([[maybe_unused]] const String& name) const" << std::endl
 		<< "{" << std::endl;
 
 	if (!klass.Fields.empty()) {
@@ -310,7 +310,7 @@ void ClassCompiler::HandleClass(const Klass& klass, const ClassDebugInfo&)
 	/* GetFieldInfo */
 	m_Header << "\t" << "Field GetFieldInfo(int id) const override;" << std::endl;
 
-	m_Impl << "Field TypeImpl<" << klass.Name << ">::GetFieldInfo(int id) const" << std::endl
+	m_Impl << "Field TypeImpl<" << klass.Name << ">::GetFieldInfo([[maybe_unused]] int id) const" << std::endl
 		<< "{" << std::endl;
 
 	if (!klass.Parent.empty())
@@ -411,7 +411,7 @@ void ClassCompiler::HandleClass(const Klass& klass, const ClassDebugInfo&)
 	m_Header << "public:" << std::endl
 			<< "\t" << "void RegisterAttributeHandler(int fieldId, const Type::AttributeHandler& callback) override;" << std::endl;
 
-	m_Impl << "void TypeImpl<" << klass.Name << ">::RegisterAttributeHandler(int fieldId, const Type::AttributeHandler& callback)" << std::endl
+	m_Impl << "void TypeImpl<" << klass.Name << ">::RegisterAttributeHandler([[maybe_unused]] int fieldId, [[maybe_unused]] const Type::AttributeHandler& callback)" << std::endl
 		<< "{" << std::endl;
 
 	if (!klass.Parent.empty())
@@ -461,7 +461,7 @@ void ClassCompiler::HandleClass(const Klass& klass, const ClassDebugInfo&)
 	/* Validate */
 	m_Header << "\t" << "void Validate(int types, const ValidationUtils& utils) override;" << std::endl;
 
-	m_Impl << "void ObjectImpl<" << klass.Name << ">::Validate(int types, const ValidationUtils& utils)" << std::endl
+	m_Impl << "void ObjectImpl<" << klass.Name << ">::Validate([[maybe_unused]] int types, [[maybe_unused]] const ValidationUtils& utils)" << std::endl
 		<< "{" << std::endl;
 
 	if (!klass.Parent.empty())
@@ -487,7 +487,7 @@ void ClassCompiler::HandleClass(const Klass& klass, const ClassDebugInfo&)
 
 		m_Header << "\t" << "void SimpleValidate" << field.GetFriendlyName() << "(const Lazy<" << field.Type.GetRealType() << ">& " << argName << ", const ValidationUtils& utils);" << std::endl;
 
-		m_Impl << "void ObjectImpl<" << klass.Name << ">::SimpleValidate" << field.GetFriendlyName() << "(const Lazy<" << field.Type.GetRealType() << ">& " << argName << ", const ValidationUtils& utils)" << std::endl
+		m_Impl << "void ObjectImpl<" << klass.Name << ">::SimpleValidate" << field.GetFriendlyName() << "([[maybe_unused]] const Lazy<" << field.Type.GetRealType() << ">& " << argName << ", [[maybe_unused]] const ValidationUtils& utils)" << std::endl
 			<< "{" << std::endl;
 
 		if (field.Attributes & FARequired) {
@@ -511,7 +511,7 @@ void ClassCompiler::HandleClass(const Klass& klass, const ClassDebugInfo&)
 		if (field.Type.ArrayRank > 0) {
 			m_Impl << "\t" << "if (avalue()) {" << std::endl
 				<< "\t\t" << "ObjectLock olock(avalue());" << std::endl
-				<< "\t\t" << "for (const Value& value : avalue()) {" << std::endl;
+				<< "\t\t" << "for ([[maybe_unused]] const Value& value : avalue()) {" << std::endl;
 		}
 
 		std::string ftype = FieldTypeToIcingaName(field, true);
@@ -742,7 +742,7 @@ void ClassCompiler::HandleClass(const Klass& klass, const ClassDebugInfo&)
 		m_Header << "public:" << std::endl
 				<< "\t" << "Object::Ptr NavigateField(int id) const override;" << std::endl;
 
-		m_Impl << "Object::Ptr ObjectImpl<" << klass.Name << ">::NavigateField(int id) const" << std::endl
+		m_Impl << "Object::Ptr ObjectImpl<" << klass.Name << ">::NavigateField([[maybe_unused]] int id) const" << std::endl
 			<< "{" << std::endl;
 
 		if (!klass.Parent.empty())
@@ -845,7 +845,7 @@ void ClassCompiler::HandleClass(const Klass& klass, const ClassDebugInfo&)
 			} else {
 				m_Header << ";" << std::endl;
 
-				m_Impl << "void ObjectImpl<" << klass.Name << ">::Set" << field.GetFriendlyName() << "(" << field.Type.GetArgumentType() << " value, bool suppress_events, const Value& cookie)" << std::endl
+				m_Impl << "void ObjectImpl<" << klass.Name << ">::Set" << field.GetFriendlyName() << "([[maybe_unused]] " << field.Type.GetArgumentType() << " value, bool suppress_events, const Value& cookie)" << std::endl
 					<< "{" << std::endl;
 
 				if (field.Type.IsName || !field.TrackAccessor.empty() || field.Attributes & FASignalWithOldValue)
@@ -1104,12 +1104,12 @@ void ClassCompiler::HandleClass(const Klass& klass, const ClassDebugInfo&)
 
 void ClassCompiler::CodeGenValidator(const std::string& name, const std::string& klass, const std::vector<Rule>& rules, const std::string& field, const FieldType& fieldType, ValidatorType validatorType)
 {
-	m_Impl << "static void TIValidate" << name << "(const intrusive_ptr<ObjectImpl<" << klass << "> >& object, ";
+	m_Impl << "static void TIValidate" << name << "([[maybe_unused]] const intrusive_ptr<ObjectImpl<" << klass << "> >& object, ";
 
 	if (validatorType != ValidatorField)
-		m_Impl << "const String& key, ";
+		m_Impl << "[[maybe_unused]] const String& key, ";
 
-	m_Impl << fieldType.GetArgumentType() << " value, std::vector<String>& location, const ValidationUtils& utils)" << std::endl
+	m_Impl << "[[maybe_unused]] " << fieldType.GetArgumentType() << " value, [[maybe_unused]] std::vector<String>& location, [[maybe_unused]] const ValidationUtils& utils)" << std::endl
 		<< "{" << std::endl;
 
 	if (validatorType == ValidatorField) {