Re: new module 'frexp'

[Bruno Haible]

> NetBSD does not only have a broken isnanl() function. It also has a broken
> frexp(): it does not treat denormalized numbers correctly.

For the same reason, the 'printf-frexp' module must be more careful about
using the system's frexp() function:

2007-03-22  Bruno Haible  <address@hidden>

        * modules/printf-frexp (Files): Add m4/frexp.m4.
        * m4/printf-frexp.m4 (gl_FUNC_PRINTF_FREXP): Define HAVE_FREXP_IN_LIBC
        only if the found frexp function actually works.

*** modules/printf-frexp        25 Feb 2007 17:43:12 -0000      1.2
--- modules/printf-frexp        22 Mar 2007 11:55:32 -0000
***************
*** 6,11 ****
--- 6,12 ----
  lib/printf-frexp.h
  lib/printf-frexp.c
  m4/printf-frexp.m4
+ m4/frexp.m4
  
  Depends-on:
  
*** m4/printf-frexp.m4  25 Feb 2007 14:20:47 -0000      1.1
--- m4/printf-frexp.m4  22 Mar 2007 11:55:32 -0000
***************
*** 1,4 ****
! # printf-frexp.m4 serial 1
  dnl Copyright (C) 2007 Free Software Foundation, Inc.
  dnl This file is free software; the Free Software Foundation
  dnl gives unlimited permission to copy and/or distribute it,
--- 1,4 ----
! # printf-frexp.m4 serial 2
  dnl Copyright (C) 2007 Free Software Foundation, Inc.
  dnl This file is free software; the Free Software Foundation
  dnl gives unlimited permission to copy and/or distribute it,
***************
*** 19,26 ****
          [gl_cv_func_frexp_no_libm=no])
      ])
    if test $gl_cv_func_frexp_no_libm = yes; then
!     AC_DEFINE([HAVE_FREXP_IN_LIBC], 1,
!       [Define if the frexp function is available in libc.])
    fi
  
    AC_CACHE_CHECK([whether ldexp can be used without linking with libm],
--- 19,31 ----
          [gl_cv_func_frexp_no_libm=no])
      ])
    if test $gl_cv_func_frexp_no_libm = yes; then
!     gl_FUNC_FREXP_WORKS
!     case "$gl_cv_func_frexp_works" in
!       *yes)
!         AC_DEFINE([HAVE_FREXP_IN_LIBC], 1,
!           [Define if the frexp function is available in libc.])
!         ;;
!     esac
    fi
  
    AC_CACHE_CHECK([whether ldexp can be used without linking with libm],