tools: allow built-in functions for newer versions of MSVC

src/rtl_adsb.c

@@ -45,8 +45,10 @@
 
 #ifdef _WIN32
 #define sleep Sleep
+#if defined(_MSC_VER) && (_MSC_VER < 1800)
 #define round(x) (x > 0.0 ? floor(x + 0.5): ceil(x - 0.5))
 #endif
+#endif
 
 #define ADSB_RATE			2000000
 #define ADSB_FREQ			1090000000

src/rtl_fm.c

@@ -62,7 +62,7 @@
 #include <io.h>
 #include "getopt/getopt.h"
 #define usleep(x) Sleep(x/1000)
-#ifdef _MSC_VER
+#if defined(_MSC_VER) && (_MSC_VER < 1800)
 #define round(x) (x > 0.0 ? floor(x + 0.5): ceil(x - 0.5))
 #endif
 #define _USE_MATH_DEFINES
@@ -271,7 +271,7 @@ int cic_9_tables[][10] = {
 	{9, -199, -362, 5303, -25505, 77489, -25505, 5303, -362, -199},
 };
 
-#ifdef _MSC_VER
+#if defined(_MSC_VER) && (_MSC_VER < 1800)
 double log2(double n)
 {
 	return log(n) / log(2.0);

src/rtl_power.c

@@ -53,7 +53,7 @@
 #include <io.h>
 #include "getopt/getopt.h"
 #define usleep(x) Sleep(x/1000)
-#ifdef _MSC_VER
+#if defined(_MSC_VER) && (_MSC_VER < 1800)
 #define round(x) (x > 0.0 ? floor(x + 0.5): ceil(x - 0.5))
 #endif
 #define _USE_MATH_DEFINES
@@ -220,7 +220,7 @@ int cic_9_tables[][10] = {
 	{9, -199, -362, 5303, -25505, 77489, -25505, 5303, -362, -199},
 };
 
-#ifdef _MSC_VER
+#if defined(_MSC_VER) && (_MSC_VER < 1800)
 double log2(double n)
 {
 	return log(n) / log(2.0);