#ifdef XOPEN2K
// <math.h>
macro fpclassify
macro isfinite
macro isinf
macro isnan
macro isnormal
macro signbit
macro isgreater
macro isgreaterequal
macro isless
macro islessequal
macro islessgreater
macro isunordered

constant M_E
constant M_LOG2E
constant M_LOG10E
constant M_LN2
constant M_LN10
constant M_PI
constant M_PI_2
constant M_PI_4
constant M_1_PI
constant M_2_PI
constant M_2_SQRTPI
constant M_SQRT2
constant M_SQRT1_2

constant MAXFLOAT
constant HUGE_VAL
constant HUGE_VALF
constant HUGE_VALL
constant INFINITY
constant NAN

macro FP_INFINITE
macro FP_NAN
macro FP_NORMAL
macro FP_SUBNORMAL
macro FP_ZERO

optional-macro FP_FAST_FMA
optional-macro FP_FAST_FMAF
optional-macro FP_FAST_FMAL

constant FP_ILOGB0
constant FP_ILOGBNAN

macro MATH_ERRNO == 1
macro MATH_ERREXCEPT == 2

function double acos (double)
function double asin (double)
function double atan (double)
function double atan2 (double, double)
function double ceil (double)
function double copysign (double, double)
function double cos (double)
function double cosh (double)
function double exp (double)
function double exp2 (double)
function double fabs (double)
function double floor (double)
function double fmod (double, double)
function double frexp (double, int*)
function double ldexp (double, int)
function double log (double)
function double log10 (double)
function double log2 (double)
function double modf (double, double*)
function double pow (double, double)
function double sin (double)
function double sinh (double)
function double sqrt (double)
function double tan (double)
function double tanh (double)
function double erf (double)
function double erfc (double)
function double gamma (double)
function double hypot (double, double)
function double j0 (double)
function double j1 (double)
function double jn (int, double)
function double lgamma (double)
function double tgamma (double)
function double y0 (double)
function double y1 (double)
function double yn (int, double)
function int isnan (double)
function double acosh (double)
function double asinh (double)
function double atanh (double)
function double cbrt (double)
function double expm1 (double)
function int ilogb (double)
function double log1p (double)
function double logb (double)
function double nextafter (double, double)
function double nexttoward (double, long double)
function double nearbyint (double)
function double remainder (double, double)
function double rint (double)
function double round (double)
function double trunc (double)
function long lrint (double)
function {long long} llrint (double)
function long lround (double)
function {long long} llround (double)
function double remquo (double, double, int*)
function double scalb (double, double)
function double scalbn (double, int)
function double scalbln (double, long)
function double fdim (double, double)
function double fmax (double, double)
function double fmin (double, double)
function double fma (double, double, double)
function double nan (const char*)

// variable signgam
allow signgam

function float acosf (float)
function float asinf (float)
function float atanf (float)
function float atan2f (float, float)
function float ceilf (float)
function float copysignf (float, float)
function float cosf (float)
function float coshf (float)
function float expf (float)
function float exp2f (float)
function float fabsf (float)
function float floorf (float)
function float fmodf (float, float)
function float frexpf (float, int*)
function float ldexpf (float, int)
function float logf (float)
function float log10f (float)
function float log2f (float)
function float modff (float, float*)
function float powf (float, float)
function float sinf (float)
function float sinhf (float)
function float sqrtf (float)
function float tanf (float)
function float tanhf (float)
function float erff (float)
function float erfcf (float)
function float gammaf (float)
function float hypotf (float, float)
function float j0f (float)
function float j1f (float)
function float jnf (int, float)
function float lgammaf (float)
function float tgammaf (float)
function float y0f (float)
function float y1f (float)
function float ynf (int, float)
function int isnanf (float)
function float acoshf (float)
function float asinhf (float)
function float atanhf (float)
function float cbrtf (float)
function float expm1f (float)
function int ilogbf (float)
function float log1pf (float)
function float logbf (float)
function float nextafterf (float, float)
function float nexttowardf (float, long double)
function float nearbyintf (float)
function float remainderf (float, float)
function float rintf (float)
function float roundf (float)
function float truncf (float)
function long lrintf (float)
function {long long} llrintf (float)
function long lroundf (float)
function {long long} llroundf (float)
function float remquof (float, float, int*)
function float scalbf (float, float)
function float scalbnf (float, int)
function float scalblnf (float, long)
function float fdimf (float, float)
function float fmaxf (float, float)
function float fminf (float, float)
function float fmaf (float, float, float)
function float nanf (const char*)

function {long double} acosl (long double)
function {long double} asinl (long double)
function {long double} atanl (long double)
function {long double} atan2l (long double, long double)
function {long double} ceill (long double)
function {long double} copysignl (long double, long double)
function {long double} cosl (long double)
function {long double} coshl (long double)
function {long double} expl (long double)
function {long double} exp2l (long double)
function {long double} fabsl (long double)
function {long double} floorl (long double)
function {long double} fmodl (long double, long double)
function {long double} frexpl (long double, int*)
function {long double} ldexpl (long double, int)
function {long double} logl (long double)
function {long double} log10l (long double)
function {long double} log2l (long double)
function {long double} modfl (long double, long double*)
function {long double} powl (long double, long double)
function {long double} sinl (long double)
function {long double} sinhl (long double)
function {long double} sqrtl (long double)
function {long double} tanl (long double)
function {long double} tanhl (long double)
function {long double} erfl (long double)
function {long double} erfcl (long double)
function {long double} gammal (long double)
function {long double} hypotl (long double, long double)
function {long double} j0l (long double)
function {long double} j1l (long double)
function {long double} jnl (int, long double)
function {long double} lgammal (long double)
function {long double} tgammal (long double)
function {long double} y0l (long double)
function {long double} y1l (long double)
function {long double} ynl (int, long double)
function int isnanl (long double)
function {long double} acoshl (long double)
function {long double} asinhl (long double)
function {long double} atanhl (long double)
function {long double} cbrtl (long double)
function {long double} expm1l (long double)
function int ilogbl (long double)
function {long double} log1pl (long double)
function {long double} logbl (long double)
function {long double} nextafterl (long double, long double)
function {long double} nexttowardl (long double, long double)
function {long double} nearbyintl (long double)
function {long double} remainderl (long double, long double)
function {long double} rintl (long double)
function {long double} roundl (long double)
function {long double} truncl (long double)
function long lrintl (long double)
function {long long} llrintl (long double)
function long lroundl (long double)
function {long long} llroundl (long double)
function {long double} remquol (long double, long double, int*)
function {long double} scalbl (long double, long double)
function {long double} scalbnl (long double, int)
function {long double} scalblnl (long double, long)
function {long double} fdiml (long double, long double)
function {long double} fmaxl (long double, long double)
function {long double} fminl (long double, long double)
function {long double} fmal (long double, long double, long double)
function {long double} nanl (const char*)

allow *_t
allow FP_*

// <complex.h>
macro complex
macro _Complex_I
optional-macro imaginary
optional-macro _Imaginary_I
macro I

function double cabs (double complex)
function {double complex} cacos (double complex)
function {double complex} cacosh (double complex)
function double carg (double complex)
function {double complex} casin (double complex)
function {double complex} casinh (double complex)
function {double complex} catan (double complex)
function {double complex} catanh (double complex)
function {double complex} ccos (double complex)
function {double complex} ccosh (double complex)
function {double complex} cexp (double complex)
function double cimag (double complex)
function {double complex} clog (double complex)
function {double complex} conj (double complex)
function {double complex} cpow (double complex, double complex)
function {double complex} cproj (double complex)
function double creal (double complex)
function {double complex} csin (double complex)
function {double complex} csinh (double complex)
function {double complex} csqrt (double complex)
function {double complex} ctan (double complex)
function {double complex} ctanh (double complex)

function float cabsf (float complex)
function {float complex} cacosf (float complex)
function {float complex} cacoshf (float complex)
function float cargf (float complex)
function {float complex} casinf (float complex)
function {float complex} casinhf (float complex)
function {float complex} catanf (float complex)
function {float complex} catanhf (float complex)
function {float complex} ccosf (float complex)
function {float complex} ccoshf (float complex)
function {float complex} cexpf (float complex)
function float cimagf (float complex)
function {float complex} clogf (float complex)
function {float complex} conjf (float complex)
function {float complex} cpowf (float complex, float complex)
function {float complex} cprojf (float complex)
function float crealf (float complex)
function {float complex} csinf (float complex)
function {float complex} csinhf (float complex)
function {float complex} csqrtf (float complex)
function {float complex} ctanf (float complex)
function {float complex} ctanhf (float complex)

function {long double} cabsl (long double complex)
function {long double complex} cacosl (long double complex)
function {long double complex} cacoshl (long double complex)
function {long double} cargl (long double complex)
function {long double complex} casinhl (long double complex)
function {long double complex} casinl (long double complex)
function {long double complex} catanhl (long double complex)
function {long double complex} catanl (long double complex)
function {long double complex} ccoshl (long double complex)
function {long double complex} ccosl (long double complex)
function {long double complex} cexpl (long double complex)
function {long double} cimagl (long double complex)
function {long double complex} clogl (long double complex)
function {long double complex} conjl (long double complex)
function {long double complex} cpowl (long double complex, long double complex)
function {long double complex} cprojl (long double complex)
function {long double} creall (long double complex)
function {long double complex} csinhl (long double complex)
function {long double complex} csinl (long double complex)
function {long double complex} csqrtl (long double complex)
function {long double complex} ctanhl (long double complex)
function {long double complex} ctanl (long double complex)

// <tgmath.h>
macro acos
macro asin
macro atan
macro acosh
macro asinh
macro atanh
macro cos
macro sin
macro tan
macro cosh
macro sinh
macro tanh
macro exp
macro pow
macro sqrt
macro fabs

macro atan2
macro cbrt
macro ceil
macro copysign
macro erf
macro erfc
macro exp2
macro expm1
macro fdim
macro floor
macro fma
macro fmax
macro fmin
macro fmod
macro frexp
macro hypot
macro ilogb
macro ldexp
macro lgamma
macro llrint
macro llround
macro log10
macro log1p
macro log2
macro logb
macro lrint
macro lround
macro nearbyint
macro nextafter
macro nexttoward
macro remainder
macro remquo
macro rint
macro round
macro scalbn
macro scalbln
macro tgamma
macro trunc

macro carg
macro cimag
macro conj
macro cproj
macro creal
#endif