1 # printf-frexpl.m4 serial 5
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([gl_MATH_H_DEFAULTS])
12 dnl Subset of gl_FUNC_FREXPL_NO_LIBM.
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 $gl_cv_func_frexpl_no_libm = yes; then
25 case "$gl_cv_func_frexpl_works" in
26 *yes) gl_func_frexpl_no_libm=yes ;;
27 *) gl_func_frexpl_no_libm=no; REPLACE_FREXPL=1 ;;
30 gl_func_frexpl_no_libm=no
32 if test $gl_func_frexpl_no_libm = yes; then
33 AC_DEFINE([HAVE_FREXPL_IN_LIBC], 1,
34 [Define if the frexpl function is available in libc.])
35 dnl Also check whether it's declared.
36 dnl MacOS X 10.3 has frexpl() in libc but doesn't declare it in <math.h>.
37 AC_CHECK_DECL([frexpl], , [HAVE_DECL_FREXPL=0], [#include <math.h>])
40 AC_CACHE_CHECK([whether ldexpl can be used without linking with libm],
41 [gl_cv_func_ldexpl_no_libm],
43 AC_TRY_LINK([#include <math.h>
46 [return ldexpl (x, y) < 1;],
47 [gl_cv_func_ldexpl_no_libm=yes],
48 [gl_cv_func_ldexpl_no_libm=no])
50 if test $gl_cv_func_ldexpl_no_libm = yes; then
52 case "$gl_cv_func_ldexpl_works" in
54 AC_DEFINE([HAVE_LDEXPL_IN_LIBC], 1,
55 [Define if the ldexpl function is available in libc.])
56 dnl Also check whether it's declared.
57 dnl MacOS X 10.3 has ldexpl() in libc but doesn't declare it in <math.h>.
58 AC_CHECK_DECL([ldexpl], , [HAVE_DECL_LDEXPL=0], [#include <math.h>])