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1 # intmax_t.m4 serial 7
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2 dnl Copyright (C) 1997-2004, 2006-2007, 2009-2010 Free Software Foundation,
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3 dnl Inc.
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4 dnl This file is free software; the Free Software Foundation
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5 dnl gives unlimited permission to copy and/or distribute it,
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6 dnl with or without modifications, as long as this notice is preserved.
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7
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8 dnl From Paul Eggert.
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9
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10 AC_PREREQ([2.13])
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11
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12 # Define intmax_t to 'long' or 'long long'
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13 # if it is not already defined in <stdint.h> or <inttypes.h>.
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14
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15 AC_DEFUN([gl_AC_TYPE_INTMAX_T],
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16 [
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17 dnl For simplicity, we assume that a header file defines 'intmax_t' if and
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18 dnl only if it defines 'uintmax_t'.
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19 AC_REQUIRE([gl_AC_HEADER_INTTYPES_H])
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20 AC_REQUIRE([gl_AC_HEADER_STDINT_H])
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21 if test $gl_cv_header_inttypes_h = no && test $gl_cv_header_stdint_h = no; then
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22 AC_REQUIRE([AC_TYPE_LONG_LONG_INT])
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23 test $ac_cv_type_long_long_int = yes \
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24 && ac_type='long long' \
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25 || ac_type='long'
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26 AC_DEFINE_UNQUOTED([intmax_t], [$ac_type],
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27 [Define to long or long long if <inttypes.h> and <stdint.h> don't define.])
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28 else
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29 AC_DEFINE([HAVE_INTMAX_T], [1],
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30 [Define if you have the 'intmax_t' type in <stdint.h> or <inttypes.h>.])
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31 fi
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32 ])
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33
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34 dnl An alternative would be to explicitly test for 'intmax_t'.
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35
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36 AC_DEFUN([gt_AC_TYPE_INTMAX_T],
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37 [
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38 AC_REQUIRE([gl_AC_HEADER_INTTYPES_H])
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39 AC_REQUIRE([gl_AC_HEADER_STDINT_H])
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40 AC_CACHE_CHECK([for intmax_t], [gt_cv_c_intmax_t],
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41 [AC_TRY_COMPILE([
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42 #include <stddef.h>
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43 #include <stdlib.h>
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44 #if HAVE_STDINT_H_WITH_UINTMAX
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45 #include <stdint.h>
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46 #endif
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47 #if HAVE_INTTYPES_H_WITH_UINTMAX
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48 #include <inttypes.h>
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49 #endif
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50 ], [intmax_t x = -1; return !x;], gt_cv_c_intmax_t=yes, gt_cv_c_intmax_t=no)])
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51 if test $gt_cv_c_intmax_t = yes; then
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52 AC_DEFINE([HAVE_INTMAX_T], [1],
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53 [Define if you have the 'intmax_t' type in <stdint.h> or <inttypes.h>.])
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54 else
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55 AC_REQUIRE([AC_TYPE_LONG_LONG_INT])
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56 test $ac_cv_type_long_long_int = yes \
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57 && ac_type='long long' \
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58 || ac_type='long'
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59 AC_DEFINE_UNQUOTED([intmax_t], [$ac_type],
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60 [Define to long or long long if <stdint.h> and <inttypes.h> don't define.])
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61 fi
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62 ])
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