| 1 | # longlong.m4 serial 17
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| 2 | dnl Copyright (C) 1999-2007, 2009-2012 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, and can be faster
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| 11 | # than what's in Autoconf 2.62 through 2.68.
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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_REQUIRE([AC_TYPE_UNSIGNED_LONG_LONG_INT])
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| 20 | AC_CACHE_CHECK([for long long int], [ac_cv_type_long_long_int],
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| 21 | [ac_cv_type_long_long_int=yes
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| 22 | if test "x${ac_cv_prog_cc_c99-no}" = xno; then
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| 23 | ac_cv_type_long_long_int=$ac_cv_type_unsigned_long_long_int
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| 24 | if test $ac_cv_type_long_long_int = yes; then
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| 25 | dnl Catch a bug in Tandem NonStop Kernel (OSS) cc -O circa 2004.
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| 26 | dnl If cross compiling, assume the bug is not important, since
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| 27 | dnl nobody cross compiles for this platform as far as we know.
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| 28 | AC_RUN_IFELSE(
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| 29 | [AC_LANG_PROGRAM(
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| 30 | [[@%:@include <limits.h>
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| 31 | @%:@ifndef LLONG_MAX
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| 32 | @%:@ define HALF \
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| 33 | (1LL << (sizeof (long long int) * CHAR_BIT - 2))
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| 34 | @%:@ define LLONG_MAX (HALF - 1 + HALF)
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| 35 | @%:@endif]],
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| 36 | [[long long int n = 1;
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| 37 | int i;
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| 38 | for (i = 0; ; i++)
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| 39 | {
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| 40 | long long int m = n << i;
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| 41 | if (m >> i != n)
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| 42 | return 1;
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| 43 | if (LLONG_MAX / 2 < m)
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| 44 | break;
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| 45 | }
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| 46 | return 0;]])],
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| 47 | [],
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| 48 | [ac_cv_type_long_long_int=no],
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| 49 | [:])
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| 50 | fi
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| 51 | fi])
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| 52 | if test $ac_cv_type_long_long_int = yes; then
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| 53 | AC_DEFINE([HAVE_LONG_LONG_INT], [1],
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| 54 | [Define to 1 if the system has the type 'long long int'.])
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| 55 | fi
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| 56 | ])
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| 57 |
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| 58 | # Define HAVE_UNSIGNED_LONG_LONG_INT if 'unsigned long long int' works.
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| 59 | # This fixes a bug in Autoconf 2.61, and can be faster
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| 60 | # than what's in Autoconf 2.62 through 2.68.
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| 61 |
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| 62 | # Note: If the type 'unsigned long long int' exists but is only 32 bits
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| 63 | # large (as on some very old compilers), AC_TYPE_UNSIGNED_LONG_LONG_INT
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| 64 | # will not be defined. In this case you can treat 'unsigned long long int'
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| 65 | # like 'unsigned long int'.
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| 66 |
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| 67 | AC_DEFUN([AC_TYPE_UNSIGNED_LONG_LONG_INT],
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| 68 | [
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| 69 | AC_CACHE_CHECK([for unsigned long long int],
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| 70 | [ac_cv_type_unsigned_long_long_int],
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| 71 | [ac_cv_type_unsigned_long_long_int=yes
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| 72 | if test "x${ac_cv_prog_cc_c99-no}" = xno; then
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| 73 | AC_LINK_IFELSE(
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| 74 | [_AC_TYPE_LONG_LONG_SNIPPET],
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| 75 | [],
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| 76 | [ac_cv_type_unsigned_long_long_int=no])
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| 77 | fi])
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| 78 | if test $ac_cv_type_unsigned_long_long_int = yes; then
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| 79 | AC_DEFINE([HAVE_UNSIGNED_LONG_LONG_INT], [1],
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| 80 | [Define to 1 if the system has the type 'unsigned long long int'.])
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| 81 | fi
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| 82 | ])
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| 83 |
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| 84 | # Expands to a C program that can be used to test for simultaneous support
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| 85 | # of 'long long' and 'unsigned long long'. We don't want to say that
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| 86 | # 'long long' is available if 'unsigned long long' is not, or vice versa,
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| 87 | # because too many programs rely on the symmetry between signed and unsigned
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| 88 | # integer types (excluding 'bool').
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| 89 | AC_DEFUN([_AC_TYPE_LONG_LONG_SNIPPET],
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| 90 | [
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| 91 | AC_LANG_PROGRAM(
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| 92 | [[/* For now, do not test the preprocessor; as of 2007 there are too many
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| 93 | implementations with broken preprocessors. Perhaps this can
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| 94 | be revisited in 2012. In the meantime, code should not expect
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| 95 | #if to work with literals wider than 32 bits. */
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| 96 | /* Test literals. */
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| 97 | long long int ll = 9223372036854775807ll;
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| 98 | long long int nll = -9223372036854775807LL;
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| 99 | unsigned long long int ull = 18446744073709551615ULL;
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| 100 | /* Test constant expressions. */
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| 101 | typedef int a[((-9223372036854775807LL < 0 && 0 < 9223372036854775807ll)
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| 102 | ? 1 : -1)];
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| 103 | typedef int b[(18446744073709551615ULL <= (unsigned long long int) -1
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| 104 | ? 1 : -1)];
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| 105 | int i = 63;]],
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| 106 | [[/* Test availability of runtime routines for shift and division. */
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| 107 | long long int llmax = 9223372036854775807ll;
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| 108 | unsigned long long int ullmax = 18446744073709551615ull;
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| 109 | return ((ll << 63) | (ll >> 63) | (ll < i) | (ll > i)
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| 110 | | (llmax / ll) | (llmax % ll)
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| 111 | | (ull << 63) | (ull >> 63) | (ull << i) | (ull >> i)
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| 112 | | (ullmax / ull) | (ullmax % ull));]])
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| 113 | ])
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