1 # printf-frexpl.m4 serial 2
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.])
26 dnl Also check whether it's declared. glibc (2.3..2.5 at least) and
27 dnl MacOS X 10.3 have frexpl() in libc but don't declare it in <math.h>.
28 AC_CHECK_DECLS([frexpl])
31 AC_CACHE_CHECK([whether ldexpl can be used without linking with libm],
32 [gl_cv_func_ldexpl_no_libm],
34 AC_TRY_LINK([#include <math.h>
37 [return ldexpl (x, y) < 1;],
38 [gl_cv_func_ldexpl_no_libm=yes],
39 [gl_cv_func_ldexpl_no_libm=no])
41 if test $gl_cv_func_ldexpl_no_libm = yes; then
42 AC_DEFINE([HAVE_LDEXPL_IN_LIBC], 1,
43 [Define if the ldexpl function is available in libc.])
44 dnl Also check whether it's declared. glibc (2.3..2.5 at least) and
45 dnl MacOS X 10.3 have ldexpl() in libc but don't declare it in <math.h>.
46 AC_CHECK_DECLS([ldexpl])