Use long double suffix

src/doomdef.h

@@ -509,13 +509,17 @@ INT32 I_GetKey(void);
 // Max gamepad/joysticks that can be detected/used.
 #define MAX_JOYSTICKS 4
 
+#ifndef M_PIl
+#define M_PIl 3.1415926535897932384626433832795029L
+#endif
+
 // Floating point comparison epsilons from float.h
 #ifndef FLT_EPSILON
 #define FLT_EPSILON 1.1920928955078125e-7f
 #endif
 
 #ifndef DBL_EPSILON
-#define DBL_EPSILON 2.2204460492503131e-16
+#define DBL_EPSILON 2.2204460492503131e-16l
 #endif
 
 // An assert-type mechanism.

src/hardware/hw_bsp.c

@@ -201,7 +201,7 @@ static polyvertex_t *fracdivline(fdivline_t *bsp, polyvertex_t *v1,
 	// (do not accept hit with the extensions)
 	num = (v2x - v1x)*v2dy + (v1y - v2y)*v2dx;
 	frac = num / den;
-	if (frac < 0.0 || frac > 1.0)
+	if (frac < 0.0l || frac > 1.0l)
 		return NULL;
 
 	// now get the frac along the BSP line

src/hardware/hw_dll.h

@@ -61,9 +61,6 @@ typedef void (*I_Error_t) (const char *error, ...) FUNCIERROR;
 // ==========================================================================
 
 // Constants
-#ifndef M_PIl
-#define M_PIl 3.1415926535897932384626433832795029L
-#endif
 #define DEGREE (0.017453292519943295769236907684883l) // 2*PI/360
 
 void DBG_Printf(const char *lpFmt, ...) /*FUNCPRINTF*/;

src/r_plane.c

@@ -1102,7 +1102,7 @@ void R_DrawSinglePlane(visplane_t *pl)
 		temp = P_GetZAt(pl->slope, pl->viewx, pl->viewy);
 		zeroheight = FIXED_TO_FLOAT(temp);
 
-#define ANG2RAD(angle) ((float)((angle)*M_PI)/ANGLE_180)
+#define ANG2RAD(angle) ((float)((angle)*M_PIl)/ANGLE_180)
 
 		// p is the texture origin in view space
 		// Don't add in the offsets at this stage, because doing so can result in