1#include <math_ldbl_opt.h>
2#include <libm-alias-ldouble.h>
3#if IS_IN (libc)
4# undef libm_alias_ldouble
5# define libm_alias_ldouble(from, to)
6#endif
7#include <sysdeps/ieee754/ldbl-128/s_copysignl.c>
8#if IS_IN (libc)
9long_double_symbol (libc, __copysignl, copysignl);
10#endif
11

source code of glibc/sysdeps/ieee754/ldbl-64-128/s_copysignl.c