fix build on VS2012

Author: mattn

mrbgems/mruby-math/src/math.c

@@ -13,7 +13,7 @@
     mrb_raise(mrb, E_RANGE_ERROR, "Numerical argument is out of domain - " #msg)
 
 /* math functions not provided by Microsoft Visual C++ 2012 or older */
-#if defined _MSC_VER && _MSC_VER < 1800
+#if defined _MSC_VER && _MSC_VER <= 1700
 
 #define MATH_TOLERANCE 1E-12
 

src/dump.c

@@ -34,7 +34,7 @@ write_irep_header(mrb_state *mrb, mrb_irep *irep, uint8_t *buf)
 {
   uint8_t *cur = buf;
 
-  cur += uint32_to_bin(get_irep_record_size_1(mrb, irep), cur);  /* record size */
+  cur += uint32_to_bin((uint32_t)get_irep_record_size_1(mrb, irep), cur);  /* record size */
   cur += uint16_to_bin((uint16_t)irep->nlocals, cur);  /* number of local variable */
   cur += uint16_to_bin((uint16_t)irep->nregs, cur);  /* number of register variable */
   cur += uint16_to_bin((uint16_t)irep->rlen, cur);  /* number of child irep */

src/string.c

@@ -4,6 +4,10 @@
 ** See Copyright Notice in mruby.h
 */
 
+#ifdef _MSC_VER
+# define _CRT_NONSTDC_NO_DEPRECATE
+#endif
+
 #include <ctype.h>
 #include <limits.h>
 #include <stddef.h>
@@ -1984,12 +1988,12 @@ mrb_str_len_to_inum(mrb_state *mrb, const char *str, size_t len, int base, int b
     }
     n *= base;
     n += c;
-    if (n > (int64_t)MRB_INT_MAX + (sign ? 0 : 1)) {
+    if (n > (uint64_t)MRB_INT_MAX + (sign ? 0 : 1)) {
       mrb_raisef(mrb, E_ARGUMENT_ERROR, "string (%S) too big for integer",
                  mrb_str_new(mrb, str, pend-str));
     }
   }
-  val = n;
+  val = (mrb_int)n;
   if (badcheck) {
     if (p == str) goto bad; /* no number */
     while (p<pend && ISSPACE(*p)) p++;