Compiling in atan()/atan2() implementation on Visual Studio 2008.

VisualC/SDL/SDL_VS2008.vcproj

@@ -539,6 +539,10 @@
 			RelativePath="..\..\src\audio\windx5\directx.h"
 			>
 		</File>
+		<File
+			RelativePath="..\..\src\libm\e_atan2.c"
+			>
+		</File>
 		<File
 			RelativePath="..\..\src\libm\e_log.c"
 			>
@@ -579,6 +583,10 @@
 			RelativePath="..\..\src\video\mmx.h"
 			>
 		</File>
+		<File
+			RelativePath="..\..\src\libm\s_atan.c"
+			>
+		</File>
 		<File
 			RelativePath="..\..\src\libm\s_copysign.c"
 			>

include/SDL_config_win32.h

@@ -125,6 +125,8 @@ typedef unsigned int uintptr_t;
 #define HAVE__STRNICMP 1
 #define HAVE_SSCANF 1
 #define HAVE_M_PI 1
+#define HAVE_ATAN 1
+#define HAVE_ATAN2 1
 #define HAVE_CEIL 1
 #define HAVE_COPYSIGN 1
 #define HAVE_COS 1

src/libm/e_atan2.c

@@ -57,8 +57,8 @@ double attribute_hidden __ieee754_atan2(double y, double x)
 	ix = hx&0x7fffffff;
 	EXTRACT_WORDS(hy,ly,y);
 	iy = hy&0x7fffffff;
-	if(((ix|((lx|-lx)>>31))>0x7ff00000)||
-	   ((iy|((ly|-ly)>>31))>0x7ff00000))	/* x or y is NaN */
+	if(((ix|((lx|-(int32_t)lx)>>31))>0x7ff00000)||
+	   ((iy|((ly|-(int32_t)ly)>>31))>0x7ff00000))	/* x or y is NaN */
 	   return x+y;
 	if(((hx-0x3ff00000)|lx)==0) return atan(y);   /* x=1.0 */
 	m = ((hy>>31)&1)|((hx>>30)&2);	/* 2*sign(x)+sign(y) */