1 # printf-frexpl.m4 serial 3
2 dnl Copyright (C) 2007 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
7 dnl Check how to define printf_frexpl() without linking with libm.
9 AC_DEFUN([gl_FUNC_PRINTF_FREXPL],
11 AC_REQUIRE([gt_TYPE_LONGDOUBLE])
12 AC_REQUIRE([gl_MATH_H_DEFAULTS])
13 if test $gt_cv_c_long_double = yes; then
14 AC_CACHE_CHECK([whether frexpl can be used without linking with libm],
15 [gl_cv_func_frexpl_no_libm],
17 AC_TRY_LINK([#include <math.h>
20 [return frexpl (x, &y) < 1;],
21 [gl_cv_func_frexpl_no_libm=yes],
22 [gl_cv_func_frexpl_no_libm=no])
24 if test $gl_cv_func_frexpl_no_libm = yes; then
25 AC_DEFINE([HAVE_FREXPL_IN_LIBC], 1,
26 [Define if the frexpl function is available in libc.])
27 dnl Also check whether it's declared.
28 dnl MacOS X 10.3 has frexpl() in libc but doesn't declare it in <math.h>.
29 AC_CHECK_DECL([frexpl], , [HAVE_DECL_FREXPL=0], [#include <math.h>])
32 AC_CACHE_CHECK([whether ldexpl can be used without linking with libm],
33 [gl_cv_func_ldexpl_no_libm],
35 AC_TRY_LINK([#include <math.h>
38 [return ldexpl (x, y) < 1;],
39 [gl_cv_func_ldexpl_no_libm=yes],
40 [gl_cv_func_ldexpl_no_libm=no])
42 if test $gl_cv_func_ldexpl_no_libm = yes; then
43 AC_DEFINE([HAVE_LDEXPL_IN_LIBC], 1,
44 [Define if the ldexpl function is available in libc.])
45 dnl Also check whether it's declared.
46 dnl MacOS X 10.3 has ldexpl() in libc but doesn't declare it in <math.h>.
47 AC_CHECK_DECL([ldexpl], , [HAVE_DECL_LDEXPL=0], [#include <math.h>])