diff options
Diffstat (limited to 'm4/longlong.m4')
-rw-r--r-- | m4/longlong.m4 | 124 |
1 files changed, 106 insertions, 18 deletions
diff --git a/m4/longlong.m4 b/m4/longlong.m4 index d7d7350b..eefb37c4 100644 --- a/m4/longlong.m4 +++ b/m4/longlong.m4 | |||
@@ -1,25 +1,113 @@ | |||
1 | # longlong.m4 serial 4 | 1 | # longlong.m4 serial 17 |
2 | dnl Copyright (C) 1999-2003 Free Software Foundation, Inc. | 2 | dnl Copyright (C) 1999-2007, 2009-2014 Free Software Foundation, Inc. |
3 | dnl This file is free software, distributed under the terms of the GNU | 3 | dnl This file is free software; the Free Software Foundation |
4 | dnl General Public License. As a special exception to the GNU General | 4 | dnl gives unlimited permission to copy and/or distribute it, |
5 | dnl Public License, this file may be distributed as part of a program | 5 | dnl with or without modifications, as long as this notice is preserved. |
6 | dnl that contains a configuration script generated by Autoconf, under | ||
7 | dnl the same distribution terms as the rest of that program. | ||
8 | 6 | ||
9 | dnl From Paul Eggert. | 7 | dnl From Paul Eggert. |
10 | 8 | ||
11 | # Define HAVE_LONG_LONG if 'long long' works. | 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 | 12 | ||
13 | AC_DEFUN([jm_AC_TYPE_LONG_LONG], | 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_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 $ac_cv_type_long_long_int = yes; then | ||
53 | AC_DEFINE([HAVE_LONG_LONG_INT], [1], | ||
54 | [Define to 1 if the system has the type 'long long int'.]) | ||
55 | fi | ||
56 | ]) | ||
57 | |||
58 | # Define HAVE_UNSIGNED_LONG_LONG_INT if 'unsigned long long int' works. | ||
59 | # This fixes a bug in Autoconf 2.61, and can be faster | ||
60 | # than what's in Autoconf 2.62 through 2.68. | ||
61 | |||
62 | # Note: If the type 'unsigned long long int' exists but is only 32 bits | ||
63 | # large (as on some very old compilers), AC_TYPE_UNSIGNED_LONG_LONG_INT | ||
64 | # will not be defined. In this case you can treat 'unsigned long long int' | ||
65 | # like 'unsigned long int'. | ||
66 | |||
67 | AC_DEFUN([AC_TYPE_UNSIGNED_LONG_LONG_INT], | ||
14 | [ | 68 | [ |
15 | AC_CACHE_CHECK([for long long], ac_cv_type_long_long, | 69 | AC_CACHE_CHECK([for unsigned long long int], |
16 | [AC_TRY_LINK([long long ll = 1LL; int i = 63;], | 70 | [ac_cv_type_unsigned_long_long_int], |
17 | [long long llmax = (long long) -1; | 71 | [ac_cv_type_unsigned_long_long_int=yes |
18 | return ll << i | ll >> i | llmax / ll | llmax % ll;], | 72 | if test "x${ac_cv_prog_cc_c99-no}" = xno; then |
19 | ac_cv_type_long_long=yes, | 73 | AC_LINK_IFELSE( |
20 | ac_cv_type_long_long=no)]) | 74 | [_AC_TYPE_LONG_LONG_SNIPPET], |
21 | if test $ac_cv_type_long_long = yes; then | 75 | [], |
22 | AC_DEFINE(HAVE_LONG_LONG, 1, | 76 | [ac_cv_type_unsigned_long_long_int=no]) |
23 | [Define if you have the 'long long' type.]) | 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'.]) | ||
24 | fi | 81 | fi |
25 | ]) | 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'). | ||
89 | AC_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 | ]) | ||