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1 # longlong.m4 serial 13
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2 dnl Copyright (C) 1999-2007 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 # Define HAVE_LONG_LONG_INT if 'long long int' works.
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10 # This fixes a bug in Autoconf 2.61, but can be removed once we
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11 # assume 2.62 everywhere.
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12
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13 # Note: If the type 'long long int' exists but is only 32 bits large
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14 # (as on some very old compilers), HAVE_LONG_LONG_INT will not be
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15 # defined. In this case you can treat 'long long int' like 'long int'.
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16
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17 AC_DEFUN([AC_TYPE_LONG_LONG_INT],
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18 [
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19 AC_CACHE_CHECK([for long long int], [ac_cv_type_long_long_int],
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20 [AC_LINK_IFELSE(
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21 [_AC_TYPE_LONG_LONG_SNIPPET],
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22 [dnl This catches a bug in Tandem NonStop Kernel (OSS) cc -O circa 2004.
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23 dnl If cross compiling, assume the bug isn't important, since
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24 dnl nobody cross compiles for this platform as far as we know.
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25 AC_RUN_IFELSE(
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26 [AC_LANG_PROGRAM(
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27 [[@%:@include <limits.h>
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28 @%:@ifndef LLONG_MAX
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29 @%:@ define HALF \
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30 (1LL << (sizeof (long long int) * CHAR_BIT - 2))
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31 @%:@ define LLONG_MAX (HALF - 1 + HALF)
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32 @%:@endif]],
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33 [[long long int n = 1;
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34 int i;
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35 for (i = 0; ; i++)
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36 {
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37 long long int m = n << i;
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38 if (m >> i != n)
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39 return 1;
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40 if (LLONG_MAX / 2 < m)
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41 break;
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42 }
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43 return 0;]])],
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44 [ac_cv_type_long_long_int=yes],
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45 [ac_cv_type_long_long_int=no],
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46 [ac_cv_type_long_long_int=yes])],
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47 [ac_cv_type_long_long_int=no])])
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48 if test $ac_cv_type_long_long_int = yes; then
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49 AC_DEFINE([HAVE_LONG_LONG_INT], 1,
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50 [Define to 1 if the system has the type `long long int'.])
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51 fi
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52 ])
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53
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54 # Define HAVE_UNSIGNED_LONG_LONG_INT if 'unsigned long long int' works.
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55 # This fixes a bug in Autoconf 2.61, but can be removed once we
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56 # assume 2.62 everywhere.
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57
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58 # Note: If the type 'unsigned long long int' exists but is only 32 bits
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59 # large (as on some very old compilers), AC_TYPE_UNSIGNED_LONG_LONG_INT
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60 # will not be defined. In this case you can treat 'unsigned long long int'
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61 # like 'unsigned long int'.
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62
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63 AC_DEFUN([AC_TYPE_UNSIGNED_LONG_LONG_INT],
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64 [
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65 AC_CACHE_CHECK([for unsigned long long int],
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66 [ac_cv_type_unsigned_long_long_int],
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67 [AC_LINK_IFELSE(
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68 [_AC_TYPE_LONG_LONG_SNIPPET],
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69 [ac_cv_type_unsigned_long_long_int=yes],
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70 [ac_cv_type_unsigned_long_long_int=no])])
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71 if test $ac_cv_type_unsigned_long_long_int = yes; then
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72 AC_DEFINE([HAVE_UNSIGNED_LONG_LONG_INT], 1,
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73 [Define to 1 if the system has the type `unsigned long long int'.])
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74 fi
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75 ])
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76
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77 # Expands to a C program that can be used to test for simultaneous support
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78 # of 'long long' and 'unsigned long long'. We don't want to say that
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79 # 'long long' is available if 'unsigned long long' is not, or vice versa,
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80 # because too many programs rely on the symmetry between signed and unsigned
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81 # integer types (excluding 'bool').
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82 AC_DEFUN([_AC_TYPE_LONG_LONG_SNIPPET],
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83 [
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84 AC_LANG_PROGRAM(
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85 [[/* For now, do not test the preprocessor; as of 2007 there are too many
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86 implementations with broken preprocessors. Perhaps this can
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87 be revisited in 2012. In the meantime, code should not expect
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88 #if to work with literals wider than 32 bits. */
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89 /* Test literals. */
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90 long long int ll = 9223372036854775807ll;
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91 long long int nll = -9223372036854775807LL;
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92 unsigned long long int ull = 18446744073709551615ULL;
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93 /* Test constant expressions. */
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94 typedef int a[((-9223372036854775807LL < 0 && 0 < 9223372036854775807ll)
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95 ? 1 : -1)];
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96 typedef int b[(18446744073709551615ULL <= (unsigned long long int) -1
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97 ? 1 : -1)];
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98 int i = 63;]],
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99 [[/* Test availability of runtime routines for shift and division. */
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100 long long int llmax = 9223372036854775807ll;
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101 unsigned long long int ullmax = 18446744073709551615ull;
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102 return ((ll << 63) | (ll >> 63) | (ll < i) | (ll > i)
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103 | (llmax / ll) | (llmax % ll)
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104 | (ull << 63) | (ull >> 63) | (ull << i) | (ull >> i)
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105 | (ullmax / ull) | (ullmax % ull));]])
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106 ])
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