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      1 # intmax_t.m4 serial 8
      2 dnl Copyright (C) 1997-2004, 2006-2007, 2009-2012 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 ])
     68