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# intmax_t.m4 serial 5
dnl Copyright (C) 1997-2004, 2006 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

dnl From Paul Eggert.

AC_PREREQ(2.13)

# Define intmax_t to 'long' or 'long long'
# if it is not already defined in <stdint.h> or <inttypes.h>.

AC_DEFUN([gl_AC_TYPE_INTMAX_T],
[
  dnl For simplicity, we assume that a header file defines 'intmax_t' if and
  dnl only if it defines 'uintmax_t'.
  AC_REQUIRE([gl_AC_HEADER_INTTYPES_H])
  AC_REQUIRE([gl_AC_HEADER_STDINT_H])
  if test $gl_cv_header_inttypes_h = no && test $gl_cv_header_stdint_h = no; then
    AC_REQUIRE([gl_AC_TYPE_LONG_LONG])
    test $ac_cv_type_long_long = yes \
      && ac_type='long long' \
      || ac_type='long'
    AC_DEFINE_UNQUOTED(intmax_t, $ac_type,
     [Define to long or long long if <inttypes.h> and <stdint.h> don't define.])
  else
    AC_DEFINE(HAVE_INTMAX_T, 1,
      [Define if you have the 'intmax_t' type in <stdint.h> or <inttypes.h>.])
  fi
])

dnl An alternative would be to explicitly test for 'intmax_t'.

AC_DEFUN([gt_AC_TYPE_INTMAX_T],
[
  AC_REQUIRE([gl_AC_HEADER_INTTYPES_H])
  AC_REQUIRE([gl_AC_HEADER_STDINT_H])
  AC_CACHE_CHECK(for intmax_t, gt_cv_c_intmax_t,
    [AC_TRY_COMPILE([
#include <stddef.h>
#include <stdlib.h>
#if HAVE_STDINT_H_WITH_UINTMAX
#include <stdint.h>
#endif
#if HAVE_INTTYPES_H_WITH_UINTMAX
#include <inttypes.h>
#endif
], [intmax_t x = -1; return !x;], gt_cv_c_intmax_t=yes, gt_cv_c_intmax_t=no)])
  if test $gt_cv_c_intmax_t = yes; then
    AC_DEFINE(HAVE_INTMAX_T, 1,
      [Define if you have the 'intmax_t' type in <stdint.h> or <inttypes.h>.])
  else
    AC_REQUIRE([gl_AC_TYPE_LONG_LONG])
    test $ac_cv_type_long_long = yes \
      && ac_type='long long' \
      || ac_type='long'
    AC_DEFINE_UNQUOTED(intmax_t, $ac_type,
     [Define to long or long long if <stdint.h> and <inttypes.h> don't define.])
  fi
])

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