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-rw-r--r--gl/m4/longlong.m4113
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1# longlong.m4 serial 17
2dnl Copyright (C) 1999-2007, 2009-2013 Free Software Foundation, Inc.
3dnl This file is free software; the Free Software Foundation
4dnl gives unlimited permission to copy and/or distribute it,
5dnl with or without modifications, as long as this notice is preserved.
6
7dnl From Paul Eggert.
8
9# Define HAVE_LONG_LONG_INT if 'long long int' works.
10# This fixes a bug in Autoconf 2.61, and can be faster
11# than what's in Autoconf 2.62 through 2.68.
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
17AC_DEFUN([AC_TYPE_LONG_LONG_INT],
18[
19 AC_REQUIRE([AC_TYPE_UNSIGNED_LONG_LONG_INT])
20 AC_CACHE_CHECK([for long long int], [ac_cv_type_long_long_int],
21 [ac_cv_type_long_long_int=yes
22 if test "x${ac_cv_prog_cc_c99-no}" = xno; then
23 ac_cv_type_long_long_int=$ac_cv_type_unsigned_long_long_int
24 if test $ac_cv_type_long_long_int = yes; then
25 dnl Catch a bug in Tandem NonStop Kernel (OSS) cc -O circa 2004.
26 dnl If cross compiling, assume the bug is not important, since
27 dnl nobody cross compiles for this platform as far as we know.
28 AC_RUN_IFELSE(
29 [AC_LANG_PROGRAM(
30 [[@%:@include <limits.h>
31 @%:@ifndef LLONG_MAX
32 @%:@ define HALF \
33 (1LL << (sizeof (long long int) * CHAR_BIT - 2))
34 @%:@ define LLONG_MAX (HALF - 1 + HALF)
35 @%:@endif]],
36 [[long long int n = 1;
37 int i;
38 for (i = 0; ; i++)
39 {
40 long long int m = n << i;
41 if (m >> i != n)
42 return 1;
43 if (LLONG_MAX / 2 < m)
44 break;
45 }
46 return 0;]])],
47 [],
48 [ac_cv_type_long_long_int=no],
49 [:])
50 fi
51 fi])
52 if test $ac_cv_type_long_long_int = yes; then
53 AC_DEFINE([HAVE_LONG_LONG_INT], [1],
54 [Define to 1 if the system has the type 'long long int'.])
55 fi
56])
57
58# Define HAVE_UNSIGNED_LONG_LONG_INT if 'unsigned long long int' works.
59# This fixes a bug in Autoconf 2.61, and can be faster
60# than what's in Autoconf 2.62 through 2.68.
61
62# Note: If the type 'unsigned long long int' exists but is only 32 bits
63# large (as on some very old compilers), AC_TYPE_UNSIGNED_LONG_LONG_INT
64# will not be defined. In this case you can treat 'unsigned long long int'
65# like 'unsigned long int'.
66
67AC_DEFUN([AC_TYPE_UNSIGNED_LONG_LONG_INT],
68[
69 AC_CACHE_CHECK([for unsigned long long int],
70 [ac_cv_type_unsigned_long_long_int],
71 [ac_cv_type_unsigned_long_long_int=yes
72 if test "x${ac_cv_prog_cc_c99-no}" = xno; then
73 AC_LINK_IFELSE(
74 [_AC_TYPE_LONG_LONG_SNIPPET],
75 [],
76 [ac_cv_type_unsigned_long_long_int=no])
77 fi])
78 if test $ac_cv_type_unsigned_long_long_int = yes; then
79 AC_DEFINE([HAVE_UNSIGNED_LONG_LONG_INT], [1],
80 [Define to 1 if the system has the type 'unsigned long long int'.])
81 fi
82])
83
84# Expands to a C program that can be used to test for simultaneous support
85# of 'long long' and 'unsigned long long'. We don't want to say that
86# 'long long' is available if 'unsigned long long' is not, or vice versa,
87# because too many programs rely on the symmetry between signed and unsigned
88# integer types (excluding 'bool').
89AC_DEFUN([_AC_TYPE_LONG_LONG_SNIPPET],
90[
91 AC_LANG_PROGRAM(
92 [[/* For now, do not test the preprocessor; as of 2007 there are too many
93 implementations with broken preprocessors. Perhaps this can
94 be revisited in 2012. In the meantime, code should not expect
95 #if to work with literals wider than 32 bits. */
96 /* Test literals. */
97 long long int ll = 9223372036854775807ll;
98 long long int nll = -9223372036854775807LL;
99 unsigned long long int ull = 18446744073709551615ULL;
100 /* Test constant expressions. */
101 typedef int a[((-9223372036854775807LL < 0 && 0 < 9223372036854775807ll)
102 ? 1 : -1)];
103 typedef int b[(18446744073709551615ULL <= (unsigned long long int) -1
104 ? 1 : -1)];
105 int i = 63;]],
106 [[/* Test availability of runtime routines for shift and division. */
107 long long int llmax = 9223372036854775807ll;
108 unsigned long long int ullmax = 18446744073709551615ull;
109 return ((ll << 63) | (ll >> 63) | (ll < i) | (ll > i)
110 | (llmax / ll) | (llmax % ll)
111 | (ull << 63) | (ull >> 63) | (ull << i) | (ull >> i)
112 | (ullmax / ull) | (ullmax % ull));]])
113])