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