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# printf-frexpl.m4 serial 6
dnl Copyright (C) 2007, 2009, 2010 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])
dnl Subset of gl_FUNC_FREXPL_NO_LIBM.
AC_CACHE_CHECK([whether frexpl can be used without linking with libm],
[gl_cv_func_frexpl_no_libm],
[
AC_TRY_LINK([#include <math.h>
long double x;
int y;],
[return frexpl (x, &y) < 1;],
[gl_cv_func_frexpl_no_libm=yes],
[gl_cv_func_frexpl_no_libm=no])
])
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 MacOS 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
AC_CACHE_CHECK([whether ldexpl can be used without linking with libm],
[gl_cv_func_ldexpl_no_libm],
[
AC_TRY_LINK([#include <math.h>
long double x;
int y;],
[return ldexpl (x, y) < 1;],
[gl_cv_func_ldexpl_no_libm=yes],
[gl_cv_func_ldexpl_no_libm=no])
])
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 MacOS 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
])
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