diff --git a/core/cache.c b/core/cache.c
index b6603324..d8890cd4 100644
--- a/core/cache.c
+++ b/core/cache.c
@@ -153,7 +153,7 @@ cycle:
 		uci = &uwsgi.cache_items[slot];
 		rounds++;
 		if (rounds > uwsgi.cache_max_items) {
-			uwsgi_log("ALARM !!! cache-loop (and potential deadlock) detected slot = %llu prev = %llu next = %llu\n", uci->next, slot, uci->prev, uci->next);
+			uwsgi_log("ALARM !!! cache-loop (and potential deadlock) detected slot = %lu prev = %lu next = %lu\n", slot, uci->prev, uci->next);
 			// terrible case: the whole uWSGI stack can deadlock, leaving only the master alive
 			// if the master is avalable, trigger a brutal reload
 			if (uwsgi.master_process) {
diff --git a/core/emperor.c b/core/emperor.c
index a1531947..c8f8c9ef 100644
--- a/core/emperor.c
+++ b/core/emperor.c
@@ -325,7 +325,7 @@ static void emperor_stats() {
 
 	while (c_ui) {
 
-		uwsgi_log("vassal instance %s (last modified %d) status %d loyal %d zerg %d\n", c_ui->name, c_ui->last_mod, c_ui->status, c_ui->loyal, c_ui->zerg);
+		uwsgi_log("vassal instance %s (last modified %lld) status %d loyal %d zerg %d\n", c_ui->name, (long long) c_ui->last_mod, c_ui->status, c_ui->loyal, c_ui->zerg);
 
 		c_ui = c_ui->ui_next;
 	}
@@ -454,7 +454,7 @@ void emperor_add(struct uwsgi_emperor_scanner *ues, char *name, time_t born, cha
 #endif
 
 	if (strlen(name) > (0xff - 1)) {
-		uwsgi_log("[emperor] invalid vassal name\n", name);
+		uwsgi_log("[emperor] invalid vassal name: %s\n", name);
 		return;
 	}
 
diff --git a/core/init.c b/core/init.c
index b1389f0b..dce57273 100644
--- a/core/init.c
+++ b/core/init.c
@@ -265,7 +265,7 @@ void uwsgi_setup_workers() {
 	}
 
 	total_memory *= (uwsgi.numproc + uwsgi.master_process);
-	uwsgi_log("mapped %llu bytes (%llu KB) for %d cores\n", total_memory, total_memory / 1024, uwsgi.cores * uwsgi.numproc);
+	uwsgi_log("mapped %lu bytes (%lu KB) for %d cores\n", total_memory, total_memory / 1024, uwsgi.cores * uwsgi.numproc);
 
 }
 
diff --git a/core/legion.c b/core/legion.c
index 0568ab8f..f6c7f89b 100644
--- a/core/legion.c
+++ b/core/legion.c
@@ -255,6 +255,7 @@ static void *legion_loop(void *foobar) {
 int uwsgi_legion_action_call(char *phase, struct uwsgi_legion *ul, struct uwsgi_string_list *usl) {
 	struct uwsgi_legion_action *ula = uwsgi_legion_action_get(usl->custom_ptr);
 	if (!ula) { 
+		//FIXME core/legion.c:258: error: format ‘%s’ expects type ‘char *’, but argument 2 has type ‘void *’
 		uwsgi_log("[uwsgi-legion] ERROR unable to find legion_action \"%s\"\n", usl->custom_ptr);
 		return -1;
 	}
diff --git a/core/master.c b/core/master.c
index e57203f0..300c7e16 100644
--- a/core/master.c
+++ b/core/master.c
@@ -85,6 +85,7 @@ void uwsgi_master_manage_udp(int udp_fd) {
 
 				// else a simple udp logger
 				if (!udp_managed) {
+					//FIXME error: field precision should have type ‘int’, but argument 4 has type ‘ssize_t’
 					uwsgi_log("[udp:%s:%d] %.*s", udp_client_addr, ntohs(udp_client.sin_port), rlen, uwsgi.wsgi_req->buffer);
 				}
 			}
@@ -1578,7 +1579,7 @@ next:
 		}
 		// manage_next_request is zero, but killed by signal...
 		else if (WIFSIGNALED(waitpid_status)) {
-			uwsgi_log("DAMN ! worker %d (pid: %d) MISTERIOUSLY killed by signal :( trying respawn ...\n", uwsgi.mywid, (int) diedpid, (int) WTERMSIG(waitpid_status));
+			uwsgi_log("DAMN ! worker %d (pid: %d) MISTERIOUSLY killed by signal %d :( trying respawn ...\n", uwsgi.mywid, (int) diedpid, (int) WTERMSIG(waitpid_status));
 		}
 
 		if (uwsgi.workers[uwsgi.mywid].cheaped == 1) {
diff --git a/core/mule.c b/core/mule.c
index 1a71708d..d54822c3 100644
--- a/core/mule.c
+++ b/core/mule.c
@@ -198,7 +198,7 @@ void uwsgi_mule_handler() {
 					}
 				}
 				if (!found)
-					uwsgi_log("*** mule %d received a %d bytes message ***\n", uwsgi.muleid, len);
+					uwsgi_log("*** mule %d received a %zd bytes message ***\n", uwsgi.muleid, len);
 			}
 		}
 	}
diff --git a/core/protocol.c b/core/protocol.c
index 6472b8de..87ed401f 100644
--- a/core/protocol.c
+++ b/core/protocol.c
@@ -1376,7 +1376,7 @@ int uwsgi_hooked_parse_dict_dgram(int fd, char *buffer, size_t len, uint8_t modi
 
 
 #ifdef UWSGI_DEBUG
-	uwsgi_log("RLEN: %d\n", rlen);
+	uwsgi_log("RLEN: %zd\n", rlen);
 #endif
 
 	// check for valid dict 4(header) 2(non-zero key)+1 2(value)
@@ -1415,7 +1415,7 @@ int uwsgi_hooked_parse_dict_dgram(int fd, char *buffer, size_t len, uint8_t modi
 
 
 #ifdef UWSGI_DEBUG
-	uwsgi_log("%p %p %d\n", ptrbuf, bufferend, bufferend - ptrbuf);
+	uwsgi_log("%p %p %ld\n", ptrbuf, bufferend, bufferend - ptrbuf);
 #endif
 
 	uwsgi_hooked_parse(ptrbuf, bufferend - ptrbuf, hook, data);
diff --git a/core/queue.c b/core/queue.c
index 907574b2..ed36ae1f 100644
--- a/core/queue.c
+++ b/core/queue.c
@@ -65,7 +65,7 @@ void uwsgi_init_queue() {
 
 	uwsgi.queue_lock = uwsgi_rwlock_init("queue");
 
-	uwsgi_log("*** Queue subsystem initialized: %dMB preallocated ***\n", (uwsgi.queue_blocksize * uwsgi.queue_size) / (1024 * 1024));
+	uwsgi_log("*** Queue subsystem initialized: %luMB preallocated ***\n", (uwsgi.queue_blocksize * uwsgi.queue_size) / (1024 * 1024));
 }
 
 char *uwsgi_queue_get(uint64_t index, uint64_t * size) {
diff --git a/core/socket.c b/core/socket.c
index 88568aa7..1e5e735f 100644
--- a/core/socket.c
+++ b/core/socket.c
@@ -631,7 +631,7 @@ int bind_to_tcp(char *socket_name, int listen_queue, char *tcp_port) {
 #ifdef __linux__
 	long somaxconn = uwsgi_num_from_file("/proc/sys/net/core/somaxconn");
 	if (somaxconn > 0 && uwsgi.listen_queue > somaxconn) {
-		uwsgi_log("Listen queue size is greater than the system max net.core.somaxconn (%i).\n", somaxconn);
+		uwsgi_log("Listen queue size is greater than the system max net.core.somaxconn (%li).\n", somaxconn);
 		uwsgi_nuclear_blast();
 	}
 #endif
diff --git a/core/spooler.c b/core/spooler.c
index 45cfeb02..46c8de6a 100644
--- a/core/spooler.c
+++ b/core/spooler.c
@@ -245,7 +245,7 @@ int spool_request(struct uwsgi_spooler *uspool, char *filename, int rn, int core
 	close(fd);
 
 	if (!uwsgi.spooler_quiet)
-		uwsgi_log("[spooler] written %d bytes to file %s\n", size + body_len + 4, filename);
+		uwsgi_log("[spooler] written %zd bytes to file %s\n", size + body_len + 4, filename);
 
 	// and here waiting threads can continue
 	uwsgi_unlock(uspool->lock);
@@ -538,7 +538,7 @@ void spooler_manage_task(struct uwsgi_spooler *uspool, char *dir, char *task) {
 					uspool->tasks++;
 					if (ret == -2) {
 						if (!uwsgi.spooler_quiet)
-							uwsgi_log("[spooler %s pid: %d] done with task %s after %d seconds\n", uspool->dir, (int) uwsgi.mypid, task, uwsgi_now() - now);
+							uwsgi_log("[spooler %s pid: %d] done with task %s after %lld seconds\n", uspool->dir, (int) uwsgi.mypid, task, (long long) uwsgi_now() - now);
 						destroy_spool(dir, task);
 					}
 					// re-spool it
diff --git a/core/utils.c b/core/utils.c
index c4f146b1..b57fec9a 100644
--- a/core/utils.c
+++ b/core/utils.c
@@ -229,7 +229,7 @@ char *uwsgi_get_cwd() {
 
 	if (getcwd(cwd, newsize) == NULL && errno == ERANGE) {
 		newsize += 256;
-		uwsgi_log("need a bigger buffer (%d bytes) for getcwd(). doing reallocation.\n", newsize);
+		uwsgi_log("need a bigger buffer (%zd bytes) for getcwd(). doing reallocation.\n", newsize);
 		free(cwd);
 		cwd = uwsgi_malloc(newsize);
 		if (getcwd(cwd, newsize) == NULL) {
@@ -4161,7 +4161,7 @@ void uwsgi_setup_post_buffering() {
 
 	if (uwsgi.post_buffering_bufsize < uwsgi.post_buffering) {
 		uwsgi.post_buffering_bufsize = uwsgi.post_buffering;
-		uwsgi_log("setting request body buffering size to %d bytes\n", uwsgi.post_buffering_bufsize);
+		uwsgi_log("setting request body buffering size to %zd bytes\n", uwsgi.post_buffering_bufsize);
 	}
 
 }
diff --git a/core/uwsgi.c b/core/uwsgi.c
index a3580d9a..dabdb655 100644
--- a/core/uwsgi.c
+++ b/core/uwsgi.c
@@ -1175,24 +1175,24 @@ void stats(int signum) {
 
 	if (uwsgi.mywid == 0) {
 		show_config();
-		uwsgi_log("\tworkers total requests: %llu\n", uwsgi.workers[0].requests);
+		uwsgi_log("\tworkers total requests: %lu\n", uwsgi.workers[0].requests);
 		uwsgi_log("-----------------\n");
 		for (j = 1; j <= uwsgi.numproc; j++) {
 			for (i = 0; i < uwsgi.workers[j].apps_cnt; i++) {
 				ua = &uwsgi.workers[j].apps[i];
 				if (ua) {
-					uwsgi_log("\tworker %d app %d [%.*s] requests: %d exceptions: %d\n", j, i, ua->mountpoint_len, ua->mountpoint, ua->requests, ua->exceptions);
+					uwsgi_log("\tworker %d app %d [%.*s] requests: %lu exceptions: %lu\n", j, i, ua->mountpoint_len, ua->mountpoint, ua->requests, ua->exceptions);
 				}
 			}
 			uwsgi_log("-----------------\n");
 		}
 	}
 	else {
-		uwsgi_log("worker %d total requests: %llu\n", uwsgi.mywid, uwsgi.workers[0].requests);
+		uwsgi_log("worker %d total requests: %lu\n", uwsgi.mywid, uwsgi.workers[0].requests);
 		for (i = 0; i < uwsgi.workers[uwsgi.mywid].apps_cnt; i++) {
 			ua = &uwsgi.workers[uwsgi.mywid].apps[i];
 			if (ua) {
-				uwsgi_log("\tapp %d [%.*s] requests: %d exceptions: %d\n", i, ua->mountpoint_len, ua->mountpoint, ua->requests, ua->exceptions);
+				uwsgi_log("\tapp %d [%.*s] requests: %lu exceptions: %lu\n", i, ua->mountpoint_len, ua->mountpoint, ua->requests, ua->exceptions);
 			}
 		}
 		uwsgi_log("-----------------\n");
@@ -2325,7 +2325,7 @@ int uwsgi_start(void *v_argv) {
 		(void) pthread_attr_init(&uwsgi.threads_attr);
 		if (uwsgi.threads_stacksize) {
 			if (pthread_attr_setstacksize(&uwsgi.threads_attr, uwsgi.threads_stacksize * 1024) == 0) {
-				uwsgi_log("threads stack size set to %dk\n", uwsgi.threads_stacksize);
+				uwsgi_log("threads stack size set to %zdk\n", uwsgi.threads_stacksize);
 			}
 			else {
 				uwsgi_log("!!! unable to set requested threads stacksize !!!\n");
@@ -3878,7 +3878,7 @@ void uwsgi_opt_add_custom_option(char *opt, char *value, void *none) {
 	char *copy = uwsgi_str(value);
 	char *equal = strchr(copy, '=');
 	if (!equal) {
-		uwsgi_log("invalid %s syntax, must be newoption=template\n");
+		uwsgi_log("invalid %s syntax, must be newoption=template\n", value);
 		exit(1);
 	}
 	*equal = 0;
diff --git a/plugins/carbon/carbon.c b/plugins/carbon/carbon.c
index 55a2f262..6fa81e08 100644
--- a/plugins/carbon/carbon.c
+++ b/plugins/carbon/carbon.c
@@ -137,7 +137,7 @@ void carbon_push_stats(int retry_cycle) {
 				u_carbon.need_retry = 1;
 				u_carbon.next_retry = uwsgi_now() + u_carbon.retry_delay;
 			} else {
-				uwsgi_log("[carbon] Maximum number of retries for %s (1)\n",
+				uwsgi_log("[carbon] Maximum number of retries for %s (%d)\n",
 					usl->value, u_carbon.max_retries);
 				usl->healthy = 0;
 				usl->errors = 0;
diff --git a/plugins/lua/lua_plugin.c b/plugins/lua/lua_plugin.c
index ea69cc6e..efde5f45 100644
--- a/plugins/lua/lua_plugin.c
+++ b/plugins/lua/lua_plugin.c
@@ -323,7 +323,7 @@ static int uwsgi_lua_input(lua_State *L) {
 	sum = lua_tonumber(L, 2);
 
 	if (n > 1) {
-		uwsgi_log("requested %d bytes\n", sum);
+		uwsgi_log("requested %zd bytes\n", sum);
 	}
 
 	buf = uwsgi_malloc(sum);
@@ -666,7 +666,7 @@ uint16_t uwsgi_lua_rpc(void * func, uint8_t argc, char **argv, uint16_t argvs[],
 	
 	sv = lua_tolstring(L, -1, &sl);
 
-	uwsgi_log("sv = %s sl = %d\n", sv, sl);
+	uwsgi_log("sv = %s sl = %zd\n", sv, sl);
 	if (sl <= 0xffff) {
 		memcpy(buffer, sv, sl);
 		return sl;
diff --git a/plugins/psgi/psgi_loader.c b/plugins/psgi/psgi_loader.c
index 369d806b..d05e7d98 100644
--- a/plugins/psgi/psgi_loader.c
+++ b/plugins/psgi/psgi_loader.c
@@ -197,6 +197,7 @@ XS(XS_error_print) {
 
 	if (items > 1) {
         	body = SvPV(ST(1), blen);
+        	//FIXME error: field precision should have type ‘int’, but argument 2 has type ‘STRLEN’
 		uwsgi_log("%.*s", blen, body);
 	}
 
diff --git a/plugins/rack/rack_plugin.c b/plugins/rack/rack_plugin.c
index 2cbc259b..0377cc4f 100644
--- a/plugins/rack/rack_plugin.c
+++ b/plugins/rack/rack_plugin.c
@@ -869,7 +869,7 @@ int uwsgi_rack_request(struct wsgi_request *wsgi_req) {
 
 	if (TYPE(ret) == T_ARRAY) {
 		if (RARRAY_LEN(ret) != 3) {
-			uwsgi_log("Invalid RACK response size: %d\n", RARRAY_LEN(ret));
+			uwsgi_log("Invalid RACK response size: %ld\n", RARRAY_LEN(ret));
 			return -1;
 		}