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-rw-r--r--math/math.h37
1 files changed, 24 insertions, 13 deletions
diff --git a/math/math.h b/math/math.h
index 7a6134a6f0..fbec2e89ae 100644
--- a/math/math.h
+++ b/math/math.h
@@ -127,20 +127,31 @@ extern int matherr __P ((struct exception *));
 
 
 #ifdef __USE_BSD
+
 /* Some useful constants.  */
-#define	M_E		2.7182818284590452354	/* e */
-#define	M_LOG2E		1.4426950408889634074	/* log 2e */
-#define	M_LOG10E	0.43429448190325182765	/* log 10e */
-#define	M_LN2		0.69314718055994530942	/* log e2 */
-#define	M_LN10		2.30258509299404568402	/* log e10 */
-#define	M_PI		3.14159265358979323846	/* pi */
-#define	M_PI_2		1.57079632679489661923	/* pi/2 */
-#define	M_PI_4		0.78539816339744830962	/* pi/4 */
-#define	M_1_PI		0.31830988618379067154	/* 1/pi */
-#define	M_2_PI		0.63661977236758134308	/* 2/pi */
-#define	M_2_SQRTPI	1.12837916709551257390	/* 2/sqrt(pi) */
-#define	M_SQRT2		1.41421356237309504880	/* sqrt(2) */
-#define	M_SQRT1_2	0.70710678118654752440	/* 1/sqrt(2) */
+#define	M_E		_Mldbl(2.7182818284590452354)	/* e */
+#define	M_LOG2E		_Mldbl(1.4426950408889634074)	/* log 2e */
+#define	M_LOG10E	_Mldbl(0.43429448190325182765)	/* log 10e */
+#define	M_LN2		_Mldbl(0.69314718055994530942)	/* log e2 */
+#define	M_LN10		_Mldbl(2.30258509299404568402)	/* log e10 */
+#define	M_PI		_Mldbl(3.14159265358979323846)	/* pi */
+#define	M_PI_2		_Mldbl(1.57079632679489661923)	/* pi/2 */
+#define	M_PI_4		_Mldbl(0.78539816339744830962)	/* pi/4 */
+#define	M_1_PI		_Mldbl(0.31830988618379067154)	/* 1/pi */
+#define	M_2_PI		_Mldbl(0.63661977236758134308)	/* 2/pi */
+#define	M_2_SQRTPI	_Mldbl(1.12837916709551257390)	/* 2/sqrt(pi) */
+#define	M_SQRT2		_Mldbl(1.41421356237309504880)	/* sqrt(2) */
+#define	M_SQRT1_2	_Mldbl(0.70710678118654752440)	/* 1/sqrt(2) */
+
+/* Our constants might specify more precision than `double' can represent.
+   Use `long double' constants in standard and GNU C, where they are
+   supported and the cast to `double'.  */
+#if __STDC__ - 0 || __GNUC__ - 0
+#define _Mldbl(x) x##L
+#else	/* Traditional C.  */
+#define _Mldbl(x) x
+#endif	/* Standard or GNU C.  */
+
 #endif