Fix a bunch of compiler warnings (mainly MinGW).

include/share/endswap.h

@@ -39,7 +39,7 @@
 
 #define	ENDSWAP_32(x)		(_byteswap_ulong (x))
 
-#elif HAVE_BYTESWAP_H		/* Linux */
+#elif defined HAVE_BYTESWAP_H		/* Linux */
 
 #include <byteswap.h>
 

src/libFLAC/stream_encoder.c

@@ -2406,6 +2406,10 @@ FLAC__StreamEncoderWriteStatus write_frame_(FLAC__StreamEncoder *encoder, const
 	FLAC__StreamEncoderWriteStatus status;
 	FLAC__uint64 output_position = 0;
 
+#if FLAC__HAS_OGG == 0
+	(void)is_last_block;
+#endif
+
 	/* FLAC__STREAM_ENCODER_TELL_STATUS_UNSUPPORTED just means we didn't get the offset; no error */
 	if(encoder->private_->tell_callback && encoder->private_->tell_callback(encoder, &output_position, encoder->private_->client_data) == FLAC__STREAM_ENCODER_TELL_STATUS_ERROR) {
 		encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;

src/metaflac/main.c

@@ -37,7 +37,7 @@ int main(int argc, char *argv[])
 #endif
 #ifdef _WIN32
 	if (get_utf8_argv(&argc, &argv) != 0) {
-		fprintf(stderr, "%ERROR: failed to convert command line parameters to UTF-8\n");
+		fputs("ERROR: failed to convert command line parameters to UTF-8\n", stderr);
 		return 1;
 	}
 #endif

src/share/getopt/getopt.c

@@ -220,13 +220,11 @@ static char *posixly_correct;
    whose names are inconsistent.  */
 
 #ifndef getenv
-extern char *getenv ();
+extern char *getenv (const char * name);
 #endif
 
 static char *
-my_index (str, chr)
-     const char *str;
-     int chr;
+my_index (const char *str, int chr)
 {
   while (*str)
     {

src/share/utf8/charset.c

@@ -359,7 +359,7 @@ static struct inverse_map *make_inverse_map(const unsigned short *from)
   return to;
 }
 
-int wctomb_8bit(void *map1, char *s, int wc1)
+static int wctomb_8bit(void *map1, char *s, int wc1)
 {
   struct map *map = map1;
   unsigned short wc = wc1;

src/share/utf8/utf8.c

@@ -182,7 +182,7 @@ int utf8_encode(const char *from, char **to)
 	/* On NT-based windows systems, we could use WideCharToMultiByte(), but
 	 * MS doesn't actually have a consistent API across win32.
 	 */
-	*to = make_utf8_string(unicode);
+	*to = (char*)make_utf8_string(unicode);
 
 	free(unicode);
 	return 0;
@@ -196,7 +196,7 @@ int utf8_decode(const char *from, char **to)
     /* On NT-based windows systems, we could use MultiByteToWideChar(CP_UTF8), but
      * MS doesn't actually have a consistent API across win32.
      */
-    unicode = make_unicode_string(from);
+    unicode = make_unicode_string((const unsigned char*)from);
     if(unicode == NULL)
     {
         fprintf(stderr, "Out of memory processing string from UTF8 to UNICODE16\n");

src/test_seeking/main.c

@@ -48,9 +48,9 @@ typedef struct {
 
 static FLAC__bool stop_signal_ = false;
 
-static void our_sigint_handler_(int signal)
+static void our_sigint_handler_(int signum)
 {
-	(void)signal;
+	(void)signum;
 	printf("(caught SIGINT) ");
 	fflush(stdout);
 	stop_signal_ = true;