gcc warnings cleanup

svn: r16209

src/mzscheme/src/network.c

@@ -652,6 +652,7 @@ struct mz_addrinfo *scheme_get_host_address(const char *address, int id, int *er
   char buf[32], *service;
   int ok;
   GC_CAN_IGNORE struct mz_addrinfo *r, hints;
+  r = NULL;
 
   if (id) {
     service = buf;

src/mzscheme/src/print.c

@@ -861,10 +861,10 @@ print_to_string(Scheme_Object *obj,
   if (params.print_graph)
     cycles = 1;
   else {
-    int fast_checker_counter = 50;
 #ifdef MZ_USE_PLACES
     cycles = -1;
 #else
+    int fast_checker_counter = 50;
     cycles = check_cycles_fast(obj, (PrintParams *)&params, &fast_checker_counter);
 #endif
     if (cycles == -1) {

src/mzscheme/src/read.c

@@ -46,6 +46,7 @@
 #ifdef USE_STACKAVAIL
 # include <malloc.h>
 #endif
+#include "math.h"
 
 #define MAX_QUICK_SYMBOL_SIZE 64