Annotation of embedaddon/libiconv/srcm4/longlong.m4, revision 1.1.1.1
1.1 misho 1: # longlong.m4 serial 14
2: dnl Copyright (C) 1999-2007, 2009 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: ])
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