1# intmax_t.m4 serial 4
2dnl Copyright (C) 1997-2004 Free Software Foundation, Inc.
3dnl This file is free software; the Free Software Foundation
4dnl gives unlimited permission to copy and/or distribute it,
5dnl with or without modifications, as long as this notice is preserved.
6
7dnl From Paul Eggert.
8
9AC_PREREQ(2.13)
10
11# Define intmax_t to 'long' or 'long long'
12# if it is not already defined in <stdint.h> or <inttypes.h>.
13
14AC_DEFUN([gl_AC_TYPE_INTMAX_T],
15[
16  dnl For simplicity, we assume that a header file defines 'intmax_t' if and
17  dnl only if it defines 'uintmax_t'.
18  AC_REQUIRE([gl_AC_HEADER_INTTYPES_H])
19  AC_REQUIRE([gl_AC_HEADER_STDINT_H])
20  if test $gl_cv_header_inttypes_h = no && test $gl_cv_header_stdint_h = no; then
21    AC_REQUIRE([gl_AC_TYPE_LONG_LONG])
22    test $ac_cv_type_long_long = yes \
23      && ac_type='long long' \
24      || ac_type='long'
25    AC_DEFINE_UNQUOTED(intmax_t, $ac_type,
26     [Define to long or long long if <inttypes.h> and <stdint.h> don't define.])
27  else
28    AC_DEFINE(HAVE_INTMAX_T, 1,
29      [Define if you have the 'intmax_t' type in <stdint.h> or <inttypes.h>.])
30  fi
31])
32
33dnl An alternative would be to explicitly test for 'intmax_t'.
34
35AC_DEFUN([gt_AC_TYPE_INTMAX_T],
36[
37  AC_REQUIRE([gl_AC_HEADER_INTTYPES_H])
38  AC_REQUIRE([gl_AC_HEADER_STDINT_H])
39  AC_CACHE_CHECK(for intmax_t, gt_cv_c_intmax_t,
40    [AC_TRY_COMPILE([
41#include <stddef.h>
42#include <stdlib.h>
43#if HAVE_STDINT_H_WITH_UINTMAX
44#include <stdint.h>
45#endif
46#if HAVE_INTTYPES_H_WITH_UINTMAX
47#include <inttypes.h>
48#endif
49], [intmax_t x = -1;], gt_cv_c_intmax_t=yes, gt_cv_c_intmax_t=no)])
50  if test $gt_cv_c_intmax_t = yes; then
51    AC_DEFINE(HAVE_INTMAX_T, 1,
52      [Define if you have the 'intmax_t' type in <stdint.h> or <inttypes.h>.])
53  else
54    AC_REQUIRE([gl_AC_TYPE_LONG_LONG])
55    test $ac_cv_type_long_long = yes \
56      && ac_type='long long' \
57      || ac_type='long'
58    AC_DEFINE_UNQUOTED(intmax_t, $ac_type,
59     [Define to long or long long if <stdint.h> and <inttypes.h> don't define.])
60  fi
61])
62