62 pub type cmpfunc = extern "C" fn(x: *const c_void, y: *const c_void) -> c_int;
1277     pub fn atan(x: c_double) -> c_double;  in atan()
1279     pub fn ceil(x: c_double) -> c_double;  in ceil()
1281     pub fn ceilf(x: c_float) -> c_float;  in ceilf()
1283     pub fn exp(x: c_double) -> c_double;  in exp()
1285     pub fn fabs(x: c_double) -> c_double;  in fabs()
1287     pub fn floor(x: c_double) -> c_double;  in floor()
1289     pub fn frexp(x: c_double, e: *mut c_int) -> c_double;  in frexp()
1291     pub fn log(x: c_double) -> c_double;  in log()
1293     pub fn log2(x: c_double) -> c_double;  in log2()
1295     pub fn pow(x: c_double, y: c_double) -> c_double;  in pow()
1297     pub fn roundf(x: c_float) -> c_float;  in roundf()
1299     pub fn scalbn(x: c_double, n: c_int) -> c_double;  in scalbn()
1301     pub fn sqrt(x: c_double) -> c_double;  in sqrt()
1304     pub fn abs(x: c_int) -> c_int;  in abs()
1324     pub fn ecvt(x: c_double, n: c_int, dp: *mut c_int, sign: *mut c_int) -> *mut c_char;  in ecvt()