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# printf-frexp.m4 serial 5
dnl Copyright (C) 2007, 2009-2020 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_frexp() without linking with libm.
AC_DEFUN([gl_FUNC_PRINTF_FREXP],
[
AC_REQUIRE([gl_CHECK_FREXP_NO_LIBM])
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],
[gl_cv_func_ldexp_no_libm],
[
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#include <math.h>
double x;
int y;]],
[[return ldexp (x, y) < 1;]])],
[gl_cv_func_ldexp_no_libm=yes],
[gl_cv_func_ldexp_no_libm=no])
])
if test $gl_cv_func_ldexp_no_libm = yes; then
AC_DEFINE([HAVE_LDEXP_IN_LIBC], [1],
[Define if the ldexp function is available in libc.])
fi
])
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