# printf-frexpl.m4 serial 10

dnl Copyright (C) 2007, 2009-2018 Free Software Foundation, Inc.

dnl This file is free software; the Free Software Foundation

dnl gives unlimited permission to copy and/or distribute it,

dnl with or without modifications, as long as this notice is preserved.

dnl Check how to define printf_frexpl() without linking with libm.

AC_DEFUN([gl_FUNC_PRINTF_FREXPL],

[

  AC_REQUIRE([gl_MATH_H_DEFAULTS])

  AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])

  dnl Subset of gl_FUNC_FREXPL_NO_LIBM.

  gl_CHECK_FREXPL_NO_LIBM

  if test $gl_cv_func_frexpl_no_libm = yes; then

    gl_FUNC_FREXPL_WORKS

    case "$gl_cv_func_frexpl_works" in

      *yes) gl_func_frexpl_no_libm=yes ;;

      *)    gl_func_frexpl_no_libm=no; REPLACE_FREXPL=1 ;;

    esac

  else

    gl_func_frexpl_no_libm=no

    dnl Set REPLACE_FREXPL here because the system may have frexpl in libm.

    REPLACE_FREXPL=1

  fi

  if test $gl_func_frexpl_no_libm = yes; then

    AC_DEFINE([HAVE_FREXPL_IN_LIBC], [1],

      [Define if the frexpl function is available in libc.])

    dnl Also check whether it's declared.

    dnl Mac OS X 10.3 has frexpl() in libc but doesn't declare it in <math.h>.

    AC_CHECK_DECL([frexpl], , [HAVE_DECL_FREXPL=0], [[#include <math.h>]])

  fi

  gl_CHECK_LDEXPL_NO_LIBM

  if test $gl_cv_func_ldexpl_no_libm = yes; then

    gl_FUNC_LDEXPL_WORKS

    case "$gl_cv_func_ldexpl_works" in

      *yes)

        AC_DEFINE([HAVE_LDEXPL_IN_LIBC], [1],

          [Define if the ldexpl function is available in libc.])

        dnl Also check whether it's declared.

        dnl Mac OS X 10.3 has ldexpl() in libc but doesn't declare it in <math.h>.

        AC_CHECK_DECL([ldexpl], , [HAVE_DECL_LDEXPL=0], [[#include <math.h>]])

        ;;

    esac

  fi

])