Fix all compilation warnings

gdbserver/gdb-server.c

@@ -172,7 +172,7 @@ int parse_options(int argc, char** argv, st_state_t *st) {
 
 
 int main(int argc, char** argv) {
-	uint32_t voltage;
+	int32_t voltage;
 
 	stlink_t *sl = NULL;
 

src/st-term.c

@@ -13,6 +13,11 @@
 
 #define STLINKY_MAGIC 0xDEADF00D
 
+#define READ_UINT32_LE(buf)  ((uint32_t) (   buf[0]         \
+                                           | buf[1] <<  8   \
+                                           | buf[2] << 16   \
+                                           | buf[3] << 24))
+
 struct stlinky {
 	stlink_t *sl;
 	uint32_t off;
@@ -26,11 +31,11 @@ struct stlinky*  stlinky_detect(stlink_t* sl)
 	static const uint32_t sram_base = 0x20000000;
 	struct stlinky* st = malloc(sizeof(struct stlinky));
 	st->sl = sl;
-	printf("sram: 0x%x bytes @ 0x%x\n", sl->sram_base, sl->sram_size);
+	printf("sram: 0x%x bytes @ 0x%zx\n", sl->sram_base, sl->sram_size);
 	uint32_t off;
 	for (off = 0; off < sl->sram_size; off += 4) {
 		stlink_read_mem32(sl, sram_base + off, 4);
-		if ( STLINKY_MAGIC== *(uint32_t*) sl->q_buf)
+		if (STLINKY_MAGIC == READ_UINT32_LE(sl->q_buf))
 		{
 			printf("stlinky detected at 0x%x\n", sram_base + off);
 			st->off = sram_base + off;
@@ -121,6 +126,7 @@ static int keep_running = 1;
 static int sigcount=0;
 void cleanup(int dummy)
 {
+	(void) dummy;
 	sigcount++;
 	keep_running = 0;
 	printf("\n\nGot a signal\n");

src/stlink-common.h

@@ -397,7 +397,7 @@ static const chip_params_t devices[] = {
         void (*step) (stlink_t * stl);
         int (*current_mode) (stlink_t * stl);
         void (*force_debug) (stlink_t *sl);
-        uint32_t (*target_voltage) (stlink_t *sl);
+        int32_t (*target_voltage) (stlink_t *sl);
     } stlink_backend_t;
 
     struct _stlink {

src/stlink-usb.c

@@ -203,7 +203,7 @@ void _stlink_usb_version(stlink_t *sl) {
     }
 }
 
-int _stlink_usb_target_voltage(stlink_t *sl) {
+int32_t _stlink_usb_target_voltage(stlink_t *sl) {
     struct stlink_libusb * const slu = sl->backend_data;
     unsigned char* const rdata = sl->q_buf;
     unsigned char* const cmd  = sl->c_buf;