strtold: New module. * lib/stdlib.in.h (strtold): New declaration. * lib/strtold.c: New file. * lib/strtod.c: Consider USE_LONG_DOUBLE. (STRTOD, LDEXP, HAVE_UNDERLYING_STRTOD, DOUBLE, MIN, MAX, L_, USE_LDEXP): New macros. (LDEXP, scale_radix_exp, parse_number, STRTOD): Adapt for USE_LONG_DOUBLE. (underlying_strtod): Remove function. Replace with some macros. Re-add the code for a missing underlying function that was removed on 2013-02-19. * m4/strtold.m4: New file. * m4/stdlib_h.m4 (gl_STDLIB_H): Test whether strtold is declared. (gl_STDLIB_H_DEFAULTS): Initialize GNULIB_STRTOLD, HAVE_STRTOLD, REPLACE_STRTOLD. * modules/stdlib (Makefile.am): Substitute GNULIB_STRTOLD, HAVE_STRTOLD, REPLACE_STRTOLD. * modules/strtold: New file. * doc/posix-functions/strtold.texi: Document the new module.

Description:
isnanf() function: test for NaN, without requiring libm.

Files:
lib/isnanf-nolibm.h
lib/isnanf.c
lib/isnan.c
lib/float+.h
m4/exponentf.m4
m4/isnanf.m4

Depends-on:
fpieee
memcmp

configure.ac:
gl_FUNC_ISNANF_NO_LIBM
if test $gl_func_isnanf_no_libm != yes; then
  AC_LIBOBJ([isnanf])
  gl_PREREQ_ISNANF
fi

Makefile.am:

Include:
"isnanf-nolibm.h"

License:
LGPLv2+

Maintainer:
all