gl_signbitl      2630 maint/gnulib/lib/math.in.h _GL_EXTERN_C int gl_signbitl (long double arg);
gl_signbitl      2654 maint/gnulib/lib/math.in.h #   if defined LDBL_SIGNBIT_WORD && defined LDBL_SIGNBIT_BIT && !defined gl_signbitl
gl_signbitl      2666 maint/gnulib/lib/math.in.h    (sizeof (x) == sizeof (long double) ? gl_signbitl (x) : \