1 # printf-frexpl.m4 serial 1
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 if test $gt_cv_c_long_double = yes; then
13 AC_CACHE_CHECK([whether frexpl can be used without linking with libm],
14 [gl_cv_func_frexpl_no_libm],
16 AC_TRY_LINK([#include <math.h>
19 [return frexpl (x, &y) < 1;],
20 [gl_cv_func_frexpl_no_libm=yes],
21 [gl_cv_func_frexpl_no_libm=no])
23 if test $gl_cv_func_frexpl_no_libm = yes; then
24 AC_DEFINE([HAVE_FREXPL_IN_LIBC], 1,
25 [Define if the frexpl function is available in libc.])
28 AC_CACHE_CHECK([whether ldexpl can be used without linking with libm],
29 [gl_cv_func_ldexpl_no_libm],
31 AC_TRY_LINK([#include <math.h>
34 [return ldexpl (x, y) < 1;],
35 [gl_cv_func_ldexpl_no_libm=yes],
36 [gl_cv_func_ldexpl_no_libm=no])
38 if test $gl_cv_func_ldexpl_no_libm = yes; then
39 AC_DEFINE([HAVE_LDEXPL_IN_LIBC], 1,
40 [Define if the ldexpl function is available in libc.])