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Diffstat (limited to 'm4/longlong.m4')
-rw-r--r-- | m4/longlong.m4 | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/m4/longlong.m4 b/m4/longlong.m4 new file mode 100644 index 00000000..cca3c1a9 --- /dev/null +++ b/m4/longlong.m4 | |||
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1 | # longlong.m4 serial 14 | ||
2 | dnl Copyright (C) 1999-2007, 2009-2010 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 | ]) | ||