Fixed the behaviour of including math.h/cmath in C++

src/libc/include/__math_def.h

@@ -0,0 +1,345 @@
+#ifndef _MATH_DEF_H
+#define _MATH_DEF_H
+
+#include <stdbool.h>
+
+#define NAN          __builtin_nanf("")
+#define INFINITY     __builtin_inff()
+
+#define HUGE_VALF    __builtin_inff()
+#define HUGE_VAL     __builtin_inf()
+#define HUGE_VALL    __builtin_infl()
+
+#define M_E           2.71828182845904523536     /* e              */
+#define M_LOG2E       1.44269504088896340736     /* log2(e)        */
+#define M_LOG10E      0.434294481903251827651    /* log10(e)       */
+#define M_LN2         0.693147180559945309417    /* ln(2)          */
+#define M_LN10        2.30258509299404568402     /* ln(10)         */
+#define M_PI          3.14159265358979323846     /* pi             */
+#define M_PI_2        1.57079632679489661923     /* pi/2           */
+#define M_PI_4        0.785398163397448309616    /* pi/4           */
+#define M_1_PI        0.318309886183790671538    /* 1/pi           */
+#define M_2_PI        0.636619772367581343076    /* 2/pi           */
+#define M_2_SQRTPI    1.12837916709551257390     /* 2/sqrt(pi)     */
+#define M_SQRT2       1.41421356237309504880     /* sqrt(2)        */
+#define M_SQRT1_2     0.707106781186547524401    /* 1/sqrt(2)      */
+
+#define FP_ILOGB0     (~__INT_MAX__)
+#define FP_ILOGBNAN     __INT_MAX__
+
+#define FP_ZERO      0x0
+#define FP_INFINITE  0x1
+#define FP_SUBNORMAL 0x2
+#define FP_NAN       0x3
+#define FP_NORMAL    0x4
+
+typedef float float_t;
+typedef double double_t;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int _fpclassifyf(float n);
+int _fpclassifyl(long double n);
+
+int _isinff(float n);
+int _isnanf(float n);
+int _isnormalf(float n);
+int _isfinitef(float n);
+int _iszerof(float n);
+int _issubnormalf(float n);
+
+int _isinfl(long double n);
+int _isnanl(long double n);
+int _isnormall(long double n);
+int _isfinitel(long double n);
+int _iszerol(long double n);
+int _issubnormall(long double n);
+
+#if 0
+/* disabled until builtin is optimized */
+#define _signbitf(x) __builtin_signbit(x)
+#define _signbitl(x) __builtin_signbit(x)
+#else
+bool _signbitf(float x);
+bool _signbitl(long double x);
+#endif
+
+double      acos(double);
+float       acosf(float);
+long double acosl(long double);
+
+double      acosh(double);
+float       acoshf(float);
+long double acoshl(long double);
+
+double      asin(double);
+float       asinf(float);
+long double asinl(long double);
+
+double      asinh(double);
+float       asinhf(float);
+long double asinhl(long double);
+
+double      atan(double);
+float       atanf(float);
+long double atanl(long double);
+
+double      atan2(double, double);
+float       atan2f(float, float);
+long double atan2l(long double, long double);
+
+double      atanh(double);
+float       atanhf(float);
+long double atanhl(long double);
+
+double      cbrt(double);
+float       cbrtf(float);
+long double cbrtl(long double);
+
+double      ceil(double);
+float       ceilf(float);
+long double ceill(long double);
+
+double      copysign(double, double);
+float       copysignf(float, float);
+long double copysignl(long double, long double);
+
+double      cos(double);
+float       cosf(float);
+long double cosl(long double);
+
+double      cosh(double);
+float       coshf(float);
+long double coshl(long double);
+
+double      erf(double);
+float       erff(float);
+long double erfl(long double);
+
+double      erfc(double);
+float       erfcf(float);
+long double erfcl(long double);
+
+double      exp(double);
+float       expf(float);
+long double expl(long double);
+
+double      exp2(double);
+float       exp2f(float);
+long double exp2l(long double);
+
+double      expm1(double);
+float       expm1f(float);
+long double expm1l(long double);
+
+#ifndef _ABS_FLOAT_DEFINED
+#define _ABS_FLOAT_DEFINED
+double      fabs(double);
+float       fabsf(float);
+long double fabsl(long double);
+#endif /* _ABS_FLOAT_DEFINED */
+
+double      fdim(double, double);
+float       fdimf(float, float);
+long double fdiml(long double, long double);
+
+double      floor(double);
+float       floorf(float);
+long double floorl(long double);
+
+double      fma(double, double, double);
+float       fmaf(float, float, float);
+long double fmal(long double, long double, long double);
+
+double      fmax(double, double);
+float       fmaxf(float, float);
+long double fmaxl(long double, long double);
+
+double      fmin(double, double);
+float       fminf(float, float);
+long double fminl(long double, long double);
+
+double      fmod(double, double);
+float       fmodf(float, float);
+long double fmodl(long double, long double);
+
+double      frexp(double, int *);
+float       frexpf(float, int *);
+long double frexpl(long double, int *);
+
+double      hypot(double, double);
+float       hypotf(float, float);
+long double hypotl(long double, long double);
+
+double      __hypot3(double, double, double);
+float       __hypot3f(float, float, float);
+long double __hypot3l(long double, long double, long double);
+
+int         ilogb(double);
+int         ilogbf(float);
+int         ilogbl(long double);
+
+double      ldexp(double, int);
+float       ldexpf(float, int);
+long double ldexpl(long double, int);
+
+double      lgamma(double);
+float       lgammaf(float);
+long double lgammal(long double);
+
+long long   llrint(double);
+long long   llrintf(float);
+long long   llrintl(long double);
+
+long long   llround(double);
+long long   llroundf(float);
+long long   llroundl(long double);
+
+double      log(double);
+float       logf(float);
+long double logl(long double);
+
+double      log10(double);
+float       log10f(float);
+long double log10l(long double);
+
+double      log1p(double);
+float       log1pf(float);
+long double log1pl(long double);
+
+double      log2(double);
+float       log2f(float);
+long double log2l(long double);
+
+double      logb(double);
+float       logbf(float);
+long double logbl(long double);
+
+long        lrint(double);
+long        lrintf(float);
+long        lrintl(long double);
+
+long        lround(double);
+long        lroundf(float);
+long        lroundl(long double);
+
+double      modf(double, double *);
+float       modff(float, float *);
+long double modfl(long double, long double *);
+
+double      nan(const char *);
+float       nanf(const char *);
+long double nanl(const char *);
+
+double      nearbyint(double);
+float       nearbyintf(float);
+long double nearbyintl(long double);
+
+double      nextafter(double, double);
+float       nextafterf(float, float);
+long double nextafterl(long double, long double);
+
+double      nextdown(double);
+float       nextdownf(float);
+long double nextdownl(long double);
+
+double      nexttoward(double, long double);
+float       nexttowardf(float, long double);
+long double nexttowardl(long double, long double);
+
+double      nextup(double);
+float       nextupf(float);
+long double nextupl(long double);
+
+double      pow(double, double);
+float       powf(float, float);
+long double powl(long double, long double);
+
+double      remainder(double, double);
+float       remainderf(float, float);
+long double remainderl(long double, long double);
+
+double      remquo(double, double, int *);
+float       remquof(float, float, int *);
+long double remquol(long double, long double, int *);
+
+double      rint(double);
+float       rintf(float);
+long double rintl(long double);
+
+double      round(double);
+float       roundf(float);
+long double roundl(long double);
+
+double      roundeven(double);
+float       roundevenf(float);
+long double roundevenl(long double);
+
+double      scalbln(double, long);
+float       scalblnf(float, long);
+long double scalblnl(long double, long);
+
+double      scalbn(double, int);
+float       scalbnf(float, int);
+long double scalbnl(long double, int);
+
+double      sin(double);
+float       sinf(float);
+long double sinl(long double);
+
+double      sinh(double);
+float       sinhf(float);
+long double sinhl(long double);
+
+double      sqrt(double);
+float       sqrtf(float);
+long double sqrtl(long double);
+
+double      tan(double);
+float       tanf(float);
+long double tanl(long double);
+
+double      tanh(double);
+float       tanhf(float);
+long double tanhl(long double);
+
+double      tgamma(double);
+float       tgammaf(float);
+long double tgammal(long double);
+
+double      trunc(double);
+float       truncf(float);
+long double truncl(long double);
+
+/* aliases */
+
+long double _debug_fabsl(long double);
+#define fabsl _debug_fabsl
+long double _debug_copysignl(long double, long double);
+#define copysignl _debug_copysignl
+long double _debug_fmaxl(long double, long double);
+#define fmaxl _debug_fmaxl
+long double _debug_fminl(long double, long double);
+#define fminl _debug_fminl
+long double _debug_truncl(long double);
+#define truncl _debug_truncl
+long double _debug_floorl(long double);
+#define floorl _debug_floorl
+long double _debug_ceill(long double);
+#define ceill _debug_ceill
+long double _debug_roundl(long double);
+#define roundl _debug_roundl
+long double _debug_nearbyintl(long double);
+#define nearbyintl _debug_nearbyintl
+long double _debug_rintl(long double);
+#define rintl _debug_rintl
+long double _debug_fmal(long double, long double, long double);
+#define fmal _debug_fmal
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _MATH_DEF_H */