make math.h compatibe with c89

[musl] / include / math.h

diff --git a/include/math.h b/include/math.h
index 6772482..4af75ed 100644 (file)
--- a/include/math.h
+++ b/include/math.h
@@ -1,6 +1,12 @@
 #ifndef _MATH_H
 #define _MATH_H
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define __NEED_float_t
+#define __NEED_double_t
 #define __NEED___uint16_t
 #define __NEED___uint32_t
 #define __NEED___uint64_t
@@ -46,7 +52,11 @@ int __fpclassifyl(long double);
 
 #define isunordered(x,y) (isnan((x)) ? ((y),1) : isnan((y)))
 
-static inline int __isrel(long double __x, long double __y, int __rel)
+static
+#if __STDC_VERSION >= 199901L
+inline
+#endif
+int __isrel(long double __x, long double __y, int __rel)
 {
        if (isunordered(__x, __y)) return 0;
        if (__rel==-2) return __x < __y;
@@ -317,4 +327,8 @@ extern int signgam;
 double      scalb(double, double);
 #endif
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif