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 | [[/* Test preprocessor. */ |
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86 | #if ! (-9223372036854775807LL < 0 && 0 < 9223372036854775807ll) |
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87 | error in preprocessor; |
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88 | #endif |
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89 | #if ! (18446744073709551615ULL <= -1ull) |
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90 | error in preprocessor; |
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91 | #endif |
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92 | /* Test literals. */ |
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93 | long long int ll = 9223372036854775807ll; |
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94 | long long int nll = -9223372036854775807LL; |
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95 | unsigned long long int ull = 18446744073709551615ULL; |
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96 | /* Test constant expressions. */ |
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97 | typedef int a[((-9223372036854775807LL < 0 && 0 < 9223372036854775807ll) |
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98 | ? 1 : -1)]; |
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99 | typedef int b[(18446744073709551615ULL <= (unsigned long long int) -1 |
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100 | ? 1 : -1)]; |
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101 | int i = 63;]], |
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102 | [[/* Test availability of runtime routines for shift and division. */ |
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103 | long long int llmax = 9223372036854775807ll; |
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104 | unsigned long long int ullmax = 18446744073709551615ull; |
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105 | return ((ll << 63) | (ll >> 63) | (ll < i) | (ll > i) |
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106 | | (llmax / ll) | (llmax % ll) |
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107 | | (ull << 63) | (ull >> 63) | (ull << i) | (ull >> i) |
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108 | | (ullmax / ull) | (ullmax % ull));]]) |
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109 | ]) |
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