1# intmax_t.m4 serial 8
2dnl Copyright (C) 1997-2004, 2006-2007, 2009-2012 Free Software Foundation,
3dnl Inc.
4dnl This file is free software; the Free Software Foundation
5dnl gives unlimited permission to copy and/or distribute it,
6dnl with or without modifications, as long as this notice is preserved.
7
8dnl From Paul Eggert.
9
10AC_PREREQ([2.53])
11
12# Define intmax_t to 'long' or 'long long'
13# if it is not already defined in <stdint.h> or <inttypes.h>.
14
15AC_DEFUN([gl_AC_TYPE_INTMAX_T],
16[
17  dnl For simplicity, we assume that a header file defines 'intmax_t' if and
18  dnl only if it defines 'uintmax_t'.
19  AC_REQUIRE([gl_AC_HEADER_INTTYPES_H])
20  AC_REQUIRE([gl_AC_HEADER_STDINT_H])
21  if test $gl_cv_header_inttypes_h = no && test $gl_cv_header_stdint_h = no; then
22    AC_REQUIRE([AC_TYPE_LONG_LONG_INT])
23    test $ac_cv_type_long_long_int = yes \
24      && ac_type='long long' \
25      || ac_type='long'
26    AC_DEFINE_UNQUOTED([intmax_t], [$ac_type],
27     [Define to long or long long if <inttypes.h> and <stdint.h> don't define.])
28  else
29    AC_DEFINE([HAVE_INTMAX_T], [1],
30      [Define if you have the 'intmax_t' type in <stdint.h> or <inttypes.h>.])
31  fi
32])
33
34dnl An alternative would be to explicitly test for 'intmax_t'.
35
36AC_DEFUN([gt_AC_TYPE_INTMAX_T],
37[
38  AC_REQUIRE([gl_AC_HEADER_INTTYPES_H])
39  AC_REQUIRE([gl_AC_HEADER_STDINT_H])
40  AC_CACHE_CHECK([for intmax_t], [gt_cv_c_intmax_t],
41    [AC_COMPILE_IFELSE(
42       [AC_LANG_PROGRAM(
43          [[
44#include <stddef.h>
45#include <stdlib.h>
46#if HAVE_STDINT_H_WITH_UINTMAX
47#include <stdint.h>
48#endif
49#if HAVE_INTTYPES_H_WITH_UINTMAX
50#include <inttypes.h>
51#endif
52          ]],
53          [[intmax_t x = -1; return !x;]])],
54       [gt_cv_c_intmax_t=yes],
55       [gt_cv_c_intmax_t=no])])
56  if test $gt_cv_c_intmax_t = yes; then
57    AC_DEFINE([HAVE_INTMAX_T], [1],
58      [Define if you have the 'intmax_t' type in <stdint.h> or <inttypes.h>.])
59  else
60    AC_REQUIRE([AC_TYPE_LONG_LONG_INT])
61    test $ac_cv_type_long_long_int = yes \
62      && ac_type='long long' \
63      || ac_type='long'
64    AC_DEFINE_UNQUOTED([intmax_t], [$ac_type],
65     [Define to long or long long if <stdint.h> and <inttypes.h> don't define.])
66  fi
67])
68