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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