Fix several MSVC issues numeric.h

-> Round negative numbers correctly CMakeLists.txt
-> Link Json with the static run-time library

src/json/CMakeLists.txt

@@ -1,4 +1,7 @@
-add_library(jsoncpp jsoncpp.cpp)
+if(MSVC)
+	set(CMAKE_CXX_FLAGS_RELEASE "/MT")
+endif()
 
+add_library(jsoncpp jsoncpp.cpp)
 target_link_libraries(jsoncpp)
 

src/unittest/test_utilities.cpp

@@ -45,6 +45,7 @@ public:
 	void testWrapRows();
 	void testIsNumber();
 	void testIsPowerOfTwo();
+	void testMyround();
 };
 
 static TestUtilities g_test_instance;
@@ -67,6 +68,7 @@ void TestUtilities::runTests(IGameDef *gamedef)
 	TEST(testWrapRows);
 	TEST(testIsNumber);
 	TEST(testIsPowerOfTwo);
+	TEST(testMyround);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -239,3 +241,12 @@ void TestUtilities::testIsPowerOfTwo()
 	}
 	UASSERT(is_power_of_two((u32)-1) == false);
 }
+
+void TestUtilities::testMyround()
+{
+	UASSERT(myround(4.6f) == 5);
+	UASSERT(myround(1.2f) == 1);
+	UASSERT(myround(-3.1f) == -3);
+	UASSERT(myround(-6.5f) == -7);
+}
+

src/util/numeric.h

@@ -288,7 +288,7 @@ bool isBlockInSight(v3s16 blockpos_b, v3f camera_pos, v3f camera_dir,
 */
 inline s32 myround(f32 f)
 {
-	return floor(f + 0.5);
+	return (s32)(f < 0.f ? (f - 0.5f) : (f + 0.5f));
 }
 
 /*