|
283
|
1 # longlong.m4 serial 13
|
|
|
2 dnl Copyright (C) 1999-2007 Free Software Foundation, Inc.
|
|
|
3 dnl This file is free software; the Free Software Foundation
|
|
|
4 dnl gives unlimited permission to copy and/or distribute it,
|
|
|
5 dnl with or without modifications, as long as this notice is preserved.
|
|
|
6
|
|
|
7 dnl From Paul Eggert.
|
|
|
8
|
|
|
9 # Define HAVE_LONG_LONG_INT if 'long long int' works.
|
|
|
10 # This fixes a bug in Autoconf 2.61, but can be removed once we
|
|
|
11 # assume 2.62 everywhere.
|
|
|
12
|
|
|
13 # Note: If the type 'long long int' exists but is only 32 bits large
|
|
|
14 # (as on some very old compilers), HAVE_LONG_LONG_INT will not be
|
|
|
15 # defined. In this case you can treat 'long long int' like 'long int'.
|
|
|
16
|
|
|
17 AC_DEFUN([AC_TYPE_LONG_LONG_INT],
|
|
|
18 [
|
|
|
19 AC_CACHE_CHECK([for long long int], [ac_cv_type_long_long_int],
|
|
|
20 [AC_LINK_IFELSE(
|
|
|
21 [_AC_TYPE_LONG_LONG_SNIPPET],
|
|
|
22 [dnl This catches a bug in Tandem NonStop Kernel (OSS) cc -O circa 2004.
|
|
|
23 dnl If cross compiling, assume the bug isn't important, since
|
|
|
24 dnl nobody cross compiles for this platform as far as we know.
|
|
|
25 AC_RUN_IFELSE(
|
|
|
26 [AC_LANG_PROGRAM(
|
|
|
27 [[@%:@include <limits.h>
|
|
|
28 @%:@ifndef LLONG_MAX
|
|
|
29 @%:@ define HALF \
|
|
|
30 (1LL << (sizeof (long long int) * CHAR_BIT - 2))
|
|
|
31 @%:@ define LLONG_MAX (HALF - 1 + HALF)
|
|
|
32 @%:@endif]],
|
|
|
33 [[long long int n = 1;
|
|
|
34 int i;
|
|
|
35 for (i = 0; ; i++)
|
|
|
36 {
|
|
|
37 long long int m = n << i;
|
|
|
38 if (m >> i != n)
|
|
|
39 return 1;
|
|
|
40 if (LLONG_MAX / 2 < m)
|
|
|
41 break;
|
|
|
42 }
|
|
|
43 return 0;]])],
|
|
|
44 [ac_cv_type_long_long_int=yes],
|
|
|
45 [ac_cv_type_long_long_int=no],
|
|
|
46 [ac_cv_type_long_long_int=yes])],
|
|
|
47 [ac_cv_type_long_long_int=no])])
|
|
|
48 if test $ac_cv_type_long_long_int = yes; then
|
|
|
49 AC_DEFINE([HAVE_LONG_LONG_INT], 1,
|
|
|
50 [Define to 1 if the system has the type `long long int'.])
|
|
|
51 fi
|
|
|
52 ])
|
|
|
53
|
|
|
54 # Define HAVE_UNSIGNED_LONG_LONG_INT if 'unsigned long long int' works.
|
|
|
55 # This fixes a bug in Autoconf 2.61, but can be removed once we
|
|
|
56 # assume 2.62 everywhere.
|
|
|
57
|
|
|
58 # Note: If the type 'unsigned long long int' exists but is only 32 bits
|
|
|
59 # large (as on some very old compilers), AC_TYPE_UNSIGNED_LONG_LONG_INT
|
|
|
60 # will not be defined. In this case you can treat 'unsigned long long int'
|
|
|
61 # like 'unsigned long int'.
|
|
|
62
|
|
|
63 AC_DEFUN([AC_TYPE_UNSIGNED_LONG_LONG_INT],
|
|
|
64 [
|
|
|
65 AC_CACHE_CHECK([for unsigned long long int],
|
|
|
66 [ac_cv_type_unsigned_long_long_int],
|
|
|
67 [AC_LINK_IFELSE(
|
|
|
68 [_AC_TYPE_LONG_LONG_SNIPPET],
|
|
|
69 [ac_cv_type_unsigned_long_long_int=yes],
|
|
|
70 [ac_cv_type_unsigned_long_long_int=no])])
|
|
|
71 if test $ac_cv_type_unsigned_long_long_int = yes; then
|
|
|
72 AC_DEFINE([HAVE_UNSIGNED_LONG_LONG_INT], 1,
|
|
|
73 [Define to 1 if the system has the type `unsigned long long int'.])
|
|
|
74 fi
|
|
|
75 ])
|
|
|
76
|
|
|
77 # Expands to a C program that can be used to test for simultaneous support
|
|
|
78 # of 'long long' and 'unsigned long long'. We don't want to say that
|
|
|
79 # 'long long' is available if 'unsigned long long' is not, or vice versa,
|
|
|
80 # because too many programs rely on the symmetry between signed and unsigned
|
|
|
81 # integer types (excluding 'bool').
|
|
|
82 AC_DEFUN([_AC_TYPE_LONG_LONG_SNIPPET],
|
|
|
83 [
|
|
|
84 AC_LANG_PROGRAM(
|
|
|
85 [[/* For now, do not test the preprocessor; as of 2007 there are too many
|
|
|
86 implementations with broken preprocessors. Perhaps this can
|
|
|
87 be revisited in 2012. In the meantime, code should not expect
|
|
|
88 #if to work with literals wider than 32 bits. */
|
|
|
89 /* Test literals. */
|
|
|
90 long long int ll = 9223372036854775807ll;
|
|
|
91 long long int nll = -9223372036854775807LL;
|
|
|
92 unsigned long long int ull = 18446744073709551615ULL;
|
|
|
93 /* Test constant expressions. */
|
|
|
94 typedef int a[((-9223372036854775807LL < 0 && 0 < 9223372036854775807ll)
|
|
|
95 ? 1 : -1)];
|
|
|
96 typedef int b[(18446744073709551615ULL <= (unsigned long long int) -1
|
|
|
97 ? 1 : -1)];
|
|
|
98 int i = 63;]],
|
|
|
99 [[/* Test availability of runtime routines for shift and division. */
|
|
|
100 long long int llmax = 9223372036854775807ll;
|
|
|
101 unsigned long long int ullmax = 18446744073709551615ull;
|
|
|
102 return ((ll << 63) | (ll >> 63) | (ll < i) | (ll > i)
|
|
|
103 | (llmax / ll) | (llmax % ll)
|
|
|
104 | (ull << 63) | (ull >> 63) | (ull << i) | (ull >> i)
|
|
|
105 | (ullmax / ull) | (ullmax % ull));]])
|
|
|
106 ])
|
