diff --git a/dump.c b/dump.c
index 3c7c0ad..37aa3c7 100644
--- a/dump.c
+++ b/dump.c
@@ -12,25 +12,25 @@
 #include "ovni_trace.h"
 #include "emu.h"
 
+//static void
+//hexdump(uint8_t *buf, size_t size)
+//{
+//	size_t i, j;
+//
+//	//printf("writing %ld bytes in cpu=%d\n", size, rthread.cpu);
+//
+//	for(i=0; i<size; i+=16)
+//	{
+//		for(j=0; j<16 && i+j < size; j++)
+//		{
+//			fprintf(stderr, "%02x ", buf[i+j]);
+//		}
+//		fprintf(stderr, "\n");
+//	}
+//}
 
 static void
-hexdump(uint8_t *buf, size_t size)
-{
-	int i, j;
-
-	//printf("writing %ld bytes in cpu=%d\n", size, rthread.cpu);
-
-	for(i=0; i<size; i+=16)
-	{
-		for(j=0; j<16 && i+j < size; j++)
-		{
-			fprintf(stderr, "%02x ", buf[i+j]);
-		}
-		fprintf(stderr, "\n");
-	}
-}
-
-void emit(struct ovni_stream *stream, struct ovni_ev *ev)
+emit(struct ovni_stream *stream, struct ovni_ev *ev)
 {
 	int64_t delta;
 	uint64_t clock;
@@ -58,9 +58,11 @@ void emit(struct ovni_stream *stream, struct ovni_ev *ev)
 }
 
 
-void dump_events(struct ovni_trace *trace)
+static void
+dump_events(struct ovni_trace *trace)
 {
-	int i, f;
+	size_t i;
+	ssize_t f;
 	uint64_t minclock, lastclock;
 	struct ovni_ev *ev;
 	struct ovni_stream *stream;
diff --git a/ovnisync.c b/ovnisync.c
index e8d2d14..8d3fdf6 100644
--- a/ovnisync.c
+++ b/ovnisync.c
@@ -84,8 +84,8 @@ cmp_double(const void *pa, const void *pb)
 		return 0;
 }
 
-void
-usage(int argc, char *argv[])
+static void
+usage(void)
 {
 	fprintf(stderr, "%s: clock synchronization utility\n", progname);
 	fprintf(stderr, "\n");
@@ -94,7 +94,7 @@ usage(int argc, char *argv[])
 	exit(EXIT_FAILURE);
 }
 
-void
+static void
 parse_options(struct options *options, int argc, char *argv[])
 {
 	int opt;
@@ -120,7 +120,7 @@ parse_options(struct options *options, int argc, char *argv[])
 				options->nsamples = atoi(optarg);
 				break;
 			default: /* '?' */
-				usage(argc, argv);
+				usage();
 		}
 	}
 
@@ -131,7 +131,7 @@ parse_options(struct options *options, int argc, char *argv[])
 	}
 }
 
-void
+static void
 get_clock_samples(struct offset *offset, int nsamples)
 {
 	int i;
@@ -150,7 +150,7 @@ get_clock_samples(struct offset *offset, int nsamples)
 	offset->wall_t1 = get_time(CLOCK_REALTIME, 0);
 }
 
-void
+static void
 fill_offset(struct offset *offset, int nsamples)
 {
 	int warmup_nsamples;
@@ -174,7 +174,7 @@ fill_offset(struct offset *offset, int nsamples)
 	get_clock_samples(offset, nsamples);
 }
 
-void
+static void
 offset_compute_delta(struct offset *ref, struct offset *cur, int nsamples, int verbose)
 {
 	int i;
@@ -222,13 +222,13 @@ offset_compute_delta(struct offset *ref, struct offset *cur, int nsamples, int v
 	free(delta);
 }
 
-size_t
+static size_t
 offset_size(int nsamples)
 {
 	return sizeof(struct offset) + sizeof(double) * nsamples;
 }
 
-struct offset *
+static struct offset *
 table_get_offset(struct offset_table *table, int i, int nsamples)
 {
 	char *p;
@@ -239,7 +239,7 @@ table_get_offset(struct offset_table *table, int i, int nsamples)
 	return (struct offset *) p;
 }
 
-struct offset_table *
+static struct offset_table *
 build_offset_table(int nsamples, int rank, int verbose)
 {
 	int i;
@@ -323,7 +323,7 @@ build_offset_table(int nsamples, int rank, int verbose)
 	return table;
 }
 
-void
+static void
 print_drift_header(struct offset_table *table)
 {
 	int i;
@@ -340,11 +340,10 @@ print_drift_header(struct offset_table *table)
 	printf("\n");
 }
 
-void
+static void
 print_drift_row(struct offset_table *table)
 {
 	int i;
-	char buf[64];
 
 	printf("%-20f", table->offset[0]->wall_t1);
 
@@ -354,7 +353,7 @@ print_drift_row(struct offset_table *table)
 	printf("\n");
 }
 
-void
+static void
 print_table_detailed(struct offset_table *table)
 {
 	int i;
@@ -370,7 +369,7 @@ print_table_detailed(struct offset_table *table)
 	}
 }
 
-void
+static void
 do_work(struct options *options, int rank)
 {
 	int drift_mode;
diff --git a/test_speed.c b/test_speed.c
index 53ff3b7..5ea723b 100644
--- a/test_speed.c
+++ b/test_speed.c
@@ -17,10 +17,9 @@
 #endif
 
 static inline void
-init()
+init(void)
 {
 	char hostname[HOST_NAME_MAX];
-	char *appid;
 
 	if(gethostname(hostname, HOST_NAME_MAX) != 0)
 	{
@@ -38,7 +37,7 @@ int main(int argc, char *argv[])
 	struct ovni_ev ev = {0};
 	int i, n;
 
-	if(argv[1] != NULL)
+	if(argc > 1)
 		n = atoi(argv[1]);
 	else
 		n = 1000;