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comparison m4/longlong.m4 @ 272:d5392bb5da3c 2.5

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date Sun, 16 Aug 2009 17:16:49 +0000
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271:3b793ba7a6c6 272:d5392bb5da3c
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 ])