diff --git a/adl.h b/adl.h
index f48c4206..ca67550c 100644
--- a/adl.h
+++ b/adl.h
@@ -21,8 +21,8 @@ void gpu_autotune(int gpu, enum dev_enable *denable);
 void clear_adl(int nDevs);
 #else /* HAVE_ADL */
 #define adl_active (0)
-static inline void init_adl(int nDevs) {}
-static inline void change_gpusettings(int gpu) { }
-static inline void clear_adl(int nDevs) {}
+static inline void init_adl(__maybe_unused int nDevs) {}
+static inline void change_gpusettings(__maybe_unused int gpu) { }
+static inline void clear_adl(__maybe_unused int nDevs) {}
 #endif
 #endif
diff --git a/api.c b/api.c
index 6a4d7156..f18f7f73 100644
--- a/api.c
+++ b/api.c
@@ -456,13 +456,13 @@ struct CODES {
  { SEVERITY_INFO,  MSG_GPUINT,	PARAM_BOTH,	"GPU %d set new intensity to %s" },
  { SEVERITY_SUCC,  MSG_MINECON, PARAM_NONE,	"CGMiner config" },
  { SEVERITY_ERR,   MSG_GPUMERR,	PARAM_BOTH,	"Setting GPU %d memoryclock to (%s) reported failure" },
- { SEVERITY_SUCC,  MSG_GPUMEM,	PARAM_BOTH,	"Setting GPU %d memoryclock to (%s) reported succeess" },
+ { SEVERITY_SUCC,  MSG_GPUMEM,	PARAM_BOTH,	"Setting GPU %d memoryclock to (%s) reported success" },
  { SEVERITY_ERR,   MSG_GPUEERR,	PARAM_BOTH,	"Setting GPU %d clock to (%s) reported failure" },
- { SEVERITY_SUCC,  MSG_GPUENG,	PARAM_BOTH,	"Setting GPU %d clock to (%s) reported succeess" },
+ { SEVERITY_SUCC,  MSG_GPUENG,	PARAM_BOTH,	"Setting GPU %d clock to (%s) reported success" },
  { SEVERITY_ERR,   MSG_GPUVERR,	PARAM_BOTH,	"Setting GPU %d vddc to (%s) reported failure" },
- { SEVERITY_SUCC,  MSG_GPUVDDC,	PARAM_BOTH,	"Setting GPU %d vddc to (%s) reported succeess" },
+ { SEVERITY_SUCC,  MSG_GPUVDDC,	PARAM_BOTH,	"Setting GPU %d vddc to (%s) reported success" },
  { SEVERITY_ERR,   MSG_GPUFERR,	PARAM_BOTH,	"Setting GPU %d fan to (%s) reported failure" },
- { SEVERITY_SUCC,  MSG_GPUFAN,	PARAM_BOTH,	"Setting GPU %d fan to (%s) reported succeess" },
+ { SEVERITY_SUCC,  MSG_GPUFAN,	PARAM_BOTH,	"Setting GPU %d fan to (%s) reported success" },
  { SEVERITY_ERR,   MSG_MISFN,	PARAM_NONE,	"Missing save filename parameter" },
  { SEVERITY_ERR,   MSG_BADFN,	PARAM_STR,	"Can't open or create save file '%s'" },
  { SEVERITY_SUCC,  MSG_SAVED,	PARAM_STR,	"Configuration saved to file '%s'" },
diff --git a/cgminer.c b/cgminer.c
index c881fbee..f0b99246 100644
--- a/cgminer.c
+++ b/cgminer.c
@@ -3797,7 +3797,7 @@ void *miner_thread(void *userdata)
 	unsigned long long hashes_done = 0;
 	unsigned long long hashes;
 	struct work *work = make_work();
-	unsigned const int request_interval = opt_scantime * 2 / 3 ? : 1;
+	const time_t request_interval = opt_scantime * 2 / 3 ? : 1;
 	unsigned const long request_nonce = MAXTHREADS / 3 * 2;
 	bool requested = false;
 	pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);
diff --git a/driver-modminer.c b/driver-modminer.c
index 3077653a..d139091e 100644
--- a/driver-modminer.c
+++ b/driver-modminer.c
@@ -164,7 +164,7 @@ fd_set fds;
 	p = strrchr(buf, '=') ?: p;
 	if (p[0] == '=')
 		++p;
-	long fwusercode = strtol(p, &p, 16);
+	unsigned long fwusercode = (unsigned long)strtoll(p, &p, 16);
 	if (p[0] != '\0')
 		bailout(LOG_ERR, "Bad usercode in ModMiner firmware file");
 	if (fwusercode == 0xffffffff)
@@ -197,7 +197,7 @@ fd_set fds;
 	if (6 != write(fd, buf, 6))
 		bailout2(LOG_ERR, "%s %u: Error programming %s (cmd)", modminer->api->name, modminer->device_id, modminer->device_path);
 	status_read("cmd reply");
-	size_t buflen;
+	ssize_t buflen;
 	while (len) {
 		buflen = len < 32 ? len : 32;
 		if (fread(buf, buflen, 1, f) != 1)
diff --git a/driver-opencl.c b/driver-opencl.c
index dd156871..521a0635 100644
--- a/driver-opencl.c
+++ b/driver-opencl.c
@@ -1110,7 +1110,7 @@ out:
 	return NULL;
 }
 #else
-void *reinit_gpu(void *userdata)
+void *reinit_gpu(__maybe_unused void *userdata)
 {
 	return NULL;
 }
diff --git a/fpgautils.c b/fpgautils.c
index 39f3abd3..783015aa 100644
--- a/fpgautils.c
+++ b/fpgautils.c
@@ -36,10 +36,10 @@
 #include "logging.h"
 #include "miner.h"
 
+#ifdef HAVE_LIBUDEV
 char
 serial_autodetect_udev(detectone_func_t detectone, const char*prodname)
 {
-#ifdef HAVE_LIBUDEV
 	if (total_devices == MAX_DEVICES)
 		return 0;
 
@@ -72,10 +72,14 @@ serial_autodetect_udev(detectone_func_t detectone, const char*prodname)
 	udev_unref(udev);
 
 	return found;
+}
 #else
+char
+serial_autodetect_udev(__maybe_unused detectone_func_t detectone, __maybe_unused const char*prodname)
+{
 	return 0;
-#endif
 }
+#endif
 
 char
 serial_autodetect_devserial(detectone_func_t detectone, const char*prodname)
@@ -115,7 +119,7 @@ serial_autodetect_devserial(detectone_func_t detectone, const char*prodname)
 }
 
 char
-_serial_detect(const char*dnamec, size_t dnamel, detectone_func_t detectone, autoscan_func_t autoscan, bool force_autoscan)
+_serial_detect(const char*dnamec, size_t dnamel, detectone_func_t detectone, autoscan_func_t autoscan, bool forceauto)
 {
 	if (total_devices == MAX_DEVICES)
 		return 0;
@@ -123,7 +127,6 @@ _serial_detect(const char*dnamec, size_t dnamel, detectone_func_t detectone, aut
 	struct string_elist *iter, *tmp;
 	const char*s;
 	bool inhibitauto = false;
-	bool forceauto = false;
 	char found = 0;
 
 	list_for_each_entry_safe(iter, tmp, &scan_devices, list) {
diff --git a/miner.h b/miner.h
index 3af5c885..4e65f22d 100644
--- a/miner.h
+++ b/miner.h
@@ -342,7 +342,7 @@ struct cgpu_info {
 	int virtual_adl;
 	int intensity;
 	bool dynamic;
-	char *kname;
+	const char *kname;
 #ifdef HAVE_OPENCL
 	cl_uint vwidth;
 	size_t work_size;