Fixed error with cmake not taking build flags

CMakeLists.txt

@@ -6,11 +6,7 @@ set(CMAKE_C_STANDARD 17)
 add_executable($ENV{MAKE_NAME})
 
 if(NOT "$ENV{MAKE_CFLAGS}" STREQUAL "")
-    string(REPLACE " " ";" CFLAGS_LIST $ENV{MAKE_CFLAGS})
-    foreach(X IN LISTS CFLAGS_LIST)
-        message(STATUS "Using C compilation flag ${X}")
-        add_compile_options(${X})
-    endforeach()
+    set_target_properties($ENV{MAKE_NAME} PROPERTIES COMPILE_FLAGS $ENV{MAKE_CFLAGS})
 endif()
 
 if(NOT "$ENV{MAKE_C_SRCS}" STREQUAL "")

srcs/main.c

@@ -25,6 +25,7 @@ static error_t parse_opt(int key, char* arg, struct argp_state* state) {
             break;
         case ARG_TTL:
             arguments->ttl = strtoul(arg, NULL, 10);
+            __attribute__ ((fallthrough));
         case ARGP_KEY_ARG:
             if (state->arg_num >= 2)
                 argp_usage(state);
@@ -40,7 +41,7 @@ static error_t parse_opt(int key, char* arg, struct argp_state* state) {
     return 0;
 }
 
-static struct argp argp = {options, parse_opt, args_doc, doc};
+static struct argp argp = {options, parse_opt, args_doc, doc, NULL, NULL, NULL};
 
 static bool stop = false;
 
@@ -58,7 +59,7 @@ double avg = 0;
 uint16_t calc_checksum(void * b, const size_t l) {
     uint16_t sum = 0;
 
-    for (int i = 0; i < l; i++) {
+    for (size_t i = 0; i < l; i++) {
         sum += *((uint16_t*)b + i);
     }
 
@@ -72,7 +73,7 @@ void send_ping() {
     packet.hdr.un.echo.id = getpid();
     packet.hdr.un.echo.sequence = xmit++;
 
-    for (int i = 0; i < sizeof(packet.msg) - 1; ++i) {
+    for (long unsigned i = 0; i < sizeof(packet.msg) - 1; ++i) {
         packet.msg[i] = (char)i;
     }
     packet.msg[sizeof(packet.msg) - 1] = '\0';