google3/third_party/grte/v5_src/glibc-2.27/sysdeps/ieee754/ldbl-opt/s_isnan.c

#include <math_ldbl_opt.h>
#include <sysdeps/ieee754/dbl-64/s_isnan.c>
#if !IS_IN (libm)
# if LONG_DOUBLE_COMPAT(libc, GLIBC_2_0)
compat_symbol (libc, __isnan, __isnanl, GLIBC_2_0);
compat_symbol (libc, isnan, isnanl, GLIBC_2_0);
# endif
#endif