diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0caf444b..d6afc594 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -26,6 +26,9 @@ if(APPLE)
 	set(CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS "${CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS} -undefined dynamic_lookup")
 endif()
 
+add_library(common-options INTERFACE)
+target_compile_options(common-options INTERFACE -Wall -Wextra -Wconversion)
+
 include(GNUInstallDirs)
 include(CheckIncludeFiles)
 
@@ -88,7 +91,6 @@ option(WITH_CJSON "Build with cJSON support (required for dynamic security plugi
 if(WITH_CJSON)
 	FIND_PACKAGE(cJSON)
 	if(CJSON_FOUND)
-		message(STATUS ${CJSON_FOUND})
 		target_compile_definitions(cJSON INTERFACE WITH_CJSON)
 	else()
 		message(STATUS "Optional dependency cJSON not found. Some features will be disabled.")
diff --git a/apps/mosquitto_ctrl/CMakeLists.txt b/apps/mosquitto_ctrl/CMakeLists.txt
index fef60f26..d3629a79 100644
--- a/apps/mosquitto_ctrl/CMakeLists.txt
+++ b/apps/mosquitto_ctrl/CMakeLists.txt
@@ -56,6 +56,7 @@ if(WITH_TLS AND CJSON_FOUND)
 
 	target_link_libraries(mosquitto_ctrl
 	  PRIVATE
+	  	common-options
 		OpenSSL::SSL
 		cJSON
 	)
diff --git a/apps/mosquitto_ctrl/options.c b/apps/mosquitto_ctrl/options.c
index 96add499..b53dc580 100644
--- a/apps/mosquitto_ctrl/options.c
+++ b/apps/mosquitto_ctrl/options.c
@@ -714,7 +714,7 @@ int client_connect(struct mosquitto *mosq, struct mosq_config *cfg)
 /* Convert %25 -> %, %3a, %3A -> :, %40 -> @ */
 static int mosquitto__urldecode(char *str)
 {
-	int i, j;
+	size_t i, j;
 	size_t len;
 	if(!str) return 0;
 
diff --git a/apps/mosquitto_passwd/CMakeLists.txt b/apps/mosquitto_passwd/CMakeLists.txt
index 3d853d64..baa0bc4c 100644
--- a/apps/mosquitto_passwd/CMakeLists.txt
+++ b/apps/mosquitto_passwd/CMakeLists.txt
@@ -21,6 +21,7 @@ if(WITH_TLS)
 
     target_link_libraries(mosquitto_passwd
 	  PRIVATE
+	  	common-options
 		OpenSSL::SSL
 	)
 
diff --git a/client/CMakeLists.txt b/client/CMakeLists.txt
index 3d99b253..113fe66e 100644
--- a/client/CMakeLists.txt
+++ b/client/CMakeLists.txt
@@ -1,9 +1,5 @@
 set(shared_src client_shared.c client_shared.h client_props.c)
 
-if(WITH_SRV)
-	add_definitions("-DWITH_SRV")
-endif()
-
 set(CLIENT_INC
 	"${OPENSSL_INCLUDE_DIR}"
 	"${STDBOOL_H_PATH}"
@@ -12,25 +8,29 @@ set(CLIENT_INC
 	"${mosquitto_SOURCE_DIR}/include"
 )
 
+add_library(client-common INTERFACE)
+target_link_libraries(client-common INTERFACE common-options)
+target_include_directories(client-common INTERFACE ${CLIENT_INC})
+target_sources(client-common INTERFACE ${shared_src})
+
+if(WITH_SRV)
+	target_compile_definitions(client-common INTERFACE "-DWITH_SRV")
+endif()
+
 if(WITH_WEBSOCKETS AND WITH_WEBSOCKETS_BUILTIN)
-	add_definitions("-DWITH_WEBSOCKETS=WS_IS_BUILTIN")
+	target_compile_definitions(client-common INTERFACE "-DWITH_WEBSOCKETS=WS_IS_BUILTIN")
 endif()
 
-add_executable(mosquitto_pub pub_client.c pub_shared.c ${shared_src})
-add_executable(mosquitto_sub sub_client.c sub_client_output.c ${shared_src})
-add_executable(mosquitto_rr rr_client.c pub_shared.c sub_client_output.c ${shared_src})
+add_executable(mosquitto_pub pub_client.c pub_shared.c)
+add_executable(mosquitto_sub sub_client.c sub_client_output.c)
+add_executable(mosquitto_rr rr_client.c pub_shared.c sub_client_output.c)
 
-target_include_directories(mosquitto_pub PRIVATE ${CLIENT_INC})
-target_include_directories(mosquitto_sub PRIVATE ${CLIENT_INC})
-target_include_directories(mosquitto_rr PRIVATE ${CLIENT_INC})
 
 if (WITH_THREADING AND NOT WIN32)
 	set(THREADS_PREFER_PTHREAD_FLAG ON)
 	find_package(Threads REQUIRED)
 
-	target_link_libraries(mosquitto_pub PRIVATE Threads::Threads)
-	target_link_libraries(mosquitto_sub PRIVATE Threads::Threads)
-	target_link_libraries(mosquitto_rr PRIVATE Threads::Threads)
+	target_link_libraries(client-common INTERFACE Threads::Threads)
 endif()
 
 if(WITH_BUNDLED_DEPS)
@@ -39,27 +39,23 @@ if(WITH_BUNDLED_DEPS)
 endif()
 
 if(CJSON_FOUND)
-	target_link_libraries(mosquitto_pub PRIVATE cJSON)
-	target_link_libraries(mosquitto_sub PRIVATE cJSON)
-	target_link_libraries(mosquitto_rr PRIVATE cJSON)
+	target_link_libraries(client-common INTERFACE cJSON)
 endif()
 
 if(WITH_STATIC_LIBRARIES)
-	target_link_libraries(mosquitto_pub PRIVATE libmosquitto_static)
-	target_link_libraries(mosquitto_sub PRIVATE libmosquitto_static)
-	target_link_libraries(mosquitto_rr PRIVATE libmosquitto_static)
+	target_link_libraries(client-common INTERFACE libmosquitto_static)
 else()
-	target_link_libraries(mosquitto_pub PRIVATE libmosquitto)
-	target_link_libraries(mosquitto_sub PRIVATE libmosquitto)
-	target_link_libraries(mosquitto_rr PRIVATE libmosquitto)
+	target_link_libraries(client-common INTERFACE libmosquitto)
 endif()
 
 if(QNX)
-	target_link_libraries(mosquitto_pub PRIVATE socket)
-	target_link_libraries(mosquitto_sub PRIVATE socket)
-	target_link_libraries(mosquitto_rr PRIVATE socket)
+	target_link_libraries(client-common INTERFACE socket)
 endif()
 
+target_link_libraries(mosquitto_pub PRIVATE client-common)
+target_link_libraries(mosquitto_sub PRIVATE client-common)
+target_link_libraries(mosquitto_rr PRIVATE client-common)
+
 install(TARGETS mosquitto_pub RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}")
 install(TARGETS mosquitto_sub RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}")
 install(TARGETS mosquitto_rr RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}")
diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index 9ec540ce..a33fbaa4 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -58,8 +58,10 @@ if (WITH_THREADING AND WIN32)
 	list(APPEND C_SRC "../common/winthread_mosq.c" "../common/winthread_mosq.h")
 endif()
 
+set(LIBRARIES common-options)
+
 if(WITH_TLS)
-	set (LIBRARIES OpenSSL::SSL)
+	set (LIBRARIES ${LIBRARIES} OpenSSL::SSL)
 endif()
 
 if(UNIX AND NOT APPLE AND NOT ANDROID)
diff --git a/lib/cpp/CMakeLists.txt b/lib/cpp/CMakeLists.txt
index d249cc57..51359ed2 100644
--- a/lib/cpp/CMakeLists.txt
+++ b/lib/cpp/CMakeLists.txt
@@ -18,7 +18,7 @@ target_include_directories(mosquittopp
 		"${mosquitto_SOURCE_DIR}/lib/cpp"
 )
 
-target_link_libraries(mosquittopp PRIVATE libmosquitto)
+target_link_libraries(mosquittopp PRIVATE libmosquitto common-options)
 
 if (WITH_THREADING AND NOT WIN32)
 	set(THREADS_PREFER_PTHREAD_FLAG ON)
diff --git a/plugins/dynamic-security/CMakeLists.txt b/plugins/dynamic-security/CMakeLists.txt
index cda3945d..163e48b4 100644
--- a/plugins/dynamic-security/CMakeLists.txt
+++ b/plugins/dynamic-security/CMakeLists.txt
@@ -55,6 +55,7 @@ if(CJSON_FOUND AND WITH_TLS)
 
 	target_link_libraries(mosquitto_dynamic_security
 		PRIVATE
+			common-options
 			cJSON
 			OpenSSL::SSL
 	)
diff --git a/plugins/persist-sqlite/CMakeLists.txt b/plugins/persist-sqlite/CMakeLists.txt
index ea3571a9..7e0adb22 100644
--- a/plugins/persist-sqlite/CMakeLists.txt
+++ b/plugins/persist-sqlite/CMakeLists.txt
@@ -30,6 +30,7 @@ if(SQLITE3_FOUND AND CJSON_FOUND)
 
 	target_link_libraries(mosquitto_persist_sqlite
 		PRIVATE
+			common-options
 			SQLite::SQLite3
 			cJSON
 	)
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index c7cbc959..0138dc5a 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -243,7 +243,8 @@ endif()
 target_link_libraries(mosquitto
 	PUBLIC
 		config-header
-  	PRIVATE
+	PRIVATE
+		common-options
 		${MOSQ_LIBS}
 )
 
diff --git a/src/mux.c b/src/mux.c
index bacb5f6b..37593c43 100644
--- a/src/mux.c
+++ b/src/mux.c
@@ -107,6 +107,8 @@ int mux__handle(struct mosquitto__listener_sock *listensock, int listensock_coun
 	UNUSED(listensock_count);
 	return mux_epoll__handle();
 #elif defined(WITH_KQUEUE)
+	UNUSED(listensock);
+	UNUSED(listensock_count);
 	return mux_kqueue__handle();
 #else
 	return mux_poll__handle(listensock, listensock_count);
diff --git a/test/broker/c/CMakeLists.txt b/test/broker/c/CMakeLists.txt
index 9fd39b12..c7756107 100644
--- a/test/broker/c/CMakeLists.txt
+++ b/test/broker/c/CMakeLists.txt
@@ -43,5 +43,5 @@ foreach(BINARY ${BINARIES})
     set_property(TARGET ${BINARY}
         PROPERTY SUFFIX .test
     )
-    target_link_libraries(${BINARY} PRIVATE libmosquitto)
+    target_link_libraries(${BINARY} PRIVATE common-options libmosquitto)
 endforeach()
diff --git a/test/lib/c/CMakeLists.txt b/test/lib/c/CMakeLists.txt
index 54f02d03..123786e5 100644
--- a/test/lib/c/CMakeLists.txt
+++ b/test/lib/c/CMakeLists.txt
@@ -61,5 +61,5 @@ foreach(BINARY ${BINARIES})
     target_compile_definitions(${BINARY} PRIVATE TEST_SOURCE_DIR="${CMAKE_CURRENT_SOURCE_DIR}")
     target_include_directories(${BINARY} PRIVATE ${CMAKE_SOURCE_DIR}/test)
     set_property(TARGET ${BINARY} PROPERTY SUFFIX .test)
-    target_link_libraries(${BINARY} PRIVATE libmosquitto)
+    target_link_libraries(${BINARY} PRIVATE common-options libmosquitto)
 endforeach()
diff --git a/test/unit/CMakeLists.txt b/test/unit/CMakeLists.txt
index b8d9ec92..1585af88 100644
--- a/test/unit/CMakeLists.txt
+++ b/test/unit/CMakeLists.txt
@@ -10,7 +10,12 @@ target_include_directories(common-unit-test-header
         "${mosquitto_SOURCE_DIR}/src"
         "${mosquitto_SOURCE_DIR}/test"
 )
-target_link_libraries(common-unit-test-header INTERFACE config-header CUnit::CUnit)
+target_link_libraries(common-unit-test-header
+    INTERFACE
+        common-options
+        config-header
+        CUnit::CUnit
+)
 
 # unit-broker
 add_executable(broker-test