1# intmax_t.m4 serial 9
2dnl Copyright (C) 1997-2004, 2006-2007, 2009-2020 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_DEFINE_UNQUOTED([intmax_t], [long long],
23     [Define to long or long long if <inttypes.h> and <stdint.h> don't define.])
24  else
25    AC_DEFINE([HAVE_INTMAX_T], [1],
26      [Define if you have the 'intmax_t' type in <stdint.h> or <inttypes.h>.])
27  fi
28])
29
30dnl An alternative would be to explicitly test for 'intmax_t'.
31
32AC_DEFUN([gt_AC_TYPE_INTMAX_T],
33[
34  AC_REQUIRE([gl_AC_HEADER_INTTYPES_H])
35  AC_REQUIRE([gl_AC_HEADER_STDINT_H])
36  AC_CACHE_CHECK([for intmax_t], [gt_cv_c_intmax_t],
37    [AC_COMPILE_IFELSE(
38       [AC_LANG_PROGRAM(
39          [[
40#include <stddef.h>
41#include <stdlib.h>
42#if HAVE_STDINT_H_WITH_UINTMAX
43#include <stdint.h>
44#endif
45#if HAVE_INTTYPES_H_WITH_UINTMAX
46#include <inttypes.h>
47#endif
48          ]],
49          [[intmax_t x = -1; return !x;]])],
50       [gt_cv_c_intmax_t=yes],
51       [gt_cv_c_intmax_t=no])])
52  if test $gt_cv_c_intmax_t = yes; then
53    AC_DEFINE([HAVE_INTMAX_T], [1],
54      [Define if you have the 'intmax_t' type in <stdint.h> or <inttypes.h>.])
55  else
56    AC_DEFINE_UNQUOTED([intmax_t], [long long],
57     [Define to long or long long if <stdint.h> and <inttypes.h> don't define.])
58  fi
59])
60