m4/intmax_t.m4

   1 # intmax_t.m4 serial 8
   2 dnl Copyright (C) 1997-2004, 2006-2007, 2009-2014 Free Software Foundation,
   3 dnl Inc.
   4 dnl This file is free software; the Free Software Foundation
   5 dnl gives unlimited permission to copy and/or distribute it,
   6 dnl with or without modifications, as long as this notice is preserved.
   7
   8 dnl From Paul Eggert.
   9
  10 AC_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
  15 AC_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
  34 dnl An alternative would be to explicitly test for 'intmax_t'.
  35
  36 AC_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 ])