diff options
Diffstat (limited to 'm4/longlong.m4')
-rw-r--r-- | m4/longlong.m4 | 119 |
1 files changed, 92 insertions, 27 deletions
diff --git a/m4/longlong.m4 b/m4/longlong.m4 index 3716c09f6..eefb37c45 100644 --- a/m4/longlong.m4 +++ b/m4/longlong.m4 | |||
@@ -1,5 +1,5 @@ | |||
1 | # longlong.m4 serial 8 | 1 | # longlong.m4 serial 17 |
2 | dnl Copyright (C) 1999-2006 Free Software Foundation, Inc. | 2 | dnl Copyright (C) 1999-2007, 2009-2014 Free Software Foundation, Inc. |
3 | dnl This file is free software; the Free Software Foundation | 3 | dnl This file is free software; the Free Software Foundation |
4 | dnl gives unlimited permission to copy and/or distribute it, | 4 | dnl gives unlimited permission to copy and/or distribute it, |
5 | dnl with or without modifications, as long as this notice is preserved. | 5 | dnl with or without modifications, as long as this notice is preserved. |
@@ -7,42 +7,107 @@ dnl with or without modifications, as long as this notice is preserved. | |||
7 | dnl From Paul Eggert. | 7 | dnl From Paul Eggert. |
8 | 8 | ||
9 | # Define HAVE_LONG_LONG_INT if 'long long int' works. | 9 | # Define HAVE_LONG_LONG_INT if 'long long int' works. |
10 | # This fixes a bug in Autoconf 2.60, but can be removed once we | 10 | # This fixes a bug in Autoconf 2.61, and can be faster |
11 | # assume 2.61 everywhere. | 11 | # than what's in Autoconf 2.62 through 2.68. |
12 | 12 | ||
13 | # Note: If the type 'long long int' exists but is only 32 bits large | 13 | # Note: If the type 'long long int' exists but is only 32 bits large |
14 | # (as on some very old compilers), AC_TYPE_LONG_LONG_INT will not be | 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'. | 15 | # defined. In this case you can treat 'long long int' like 'long int'. |
16 | 16 | ||
17 | AC_DEFUN([AC_TYPE_LONG_LONG_INT], | 17 | AC_DEFUN([AC_TYPE_LONG_LONG_INT], |
18 | [ | 18 | [ |
19 | AC_REQUIRE([AC_TYPE_UNSIGNED_LONG_LONG_INT]) | ||
19 | AC_CACHE_CHECK([for long long int], [ac_cv_type_long_long_int], | 20 | AC_CACHE_CHECK([for long long int], [ac_cv_type_long_long_int], |
20 | [AC_LINK_IFELSE( | 21 | [ac_cv_type_long_long_int=yes |
21 | [AC_LANG_PROGRAM( | 22 | if test "x${ac_cv_prog_cc_c99-no}" = xno; then |
22 | [[long long int ll = 9223372036854775807ll; | 23 | ac_cv_type_long_long_int=$ac_cv_type_unsigned_long_long_int |
23 | long long int nll = -9223372036854775807LL; | 24 | if test $ac_cv_type_long_long_int = yes; then |
24 | typedef int a[((-9223372036854775807LL < 0 | 25 | dnl Catch a bug in Tandem NonStop Kernel (OSS) cc -O circa 2004. |
25 | && 0 < 9223372036854775807ll) | 26 | dnl If cross compiling, assume the bug is not important, since |
26 | ? 1 : -1)]; | 27 | dnl nobody cross compiles for this platform as far as we know. |
27 | int i = 63;]], | 28 | AC_RUN_IFELSE( |
28 | [[long long int llmax = 9223372036854775807ll; | 29 | [AC_LANG_PROGRAM( |
29 | return ((ll << 63) | (ll >> 63) | (ll < i) | (ll > i) | 30 | [[@%:@include <limits.h> |
30 | | (llmax / ll) | (llmax % ll));]])], | 31 | @%:@ifndef LLONG_MAX |
31 | [ac_cv_type_long_long_int=yes], | 32 | @%:@ define HALF \ |
32 | [ac_cv_type_long_long_int=no])]) | 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]) | ||
33 | if test $ac_cv_type_long_long_int = yes; then | 52 | if test $ac_cv_type_long_long_int = yes; then |
34 | AC_DEFINE([HAVE_LONG_LONG_INT], 1, | 53 | AC_DEFINE([HAVE_LONG_LONG_INT], [1], |
35 | [Define to 1 if the system has the type `long long int'.]) | 54 | [Define to 1 if the system has the type 'long long int'.]) |
36 | fi | 55 | fi |
37 | ]) | 56 | ]) |
38 | 57 | ||
39 | # This macro is obsolescent and should go away soon. | 58 | # Define HAVE_UNSIGNED_LONG_LONG_INT if 'unsigned long long int' works. |
40 | AC_DEFUN([gl_AC_TYPE_LONG_LONG], | 59 | # This fixes a bug in Autoconf 2.61, and can be faster |
60 | # than what's in Autoconf 2.62 through 2.68. | ||
61 | |||
62 | # Note: If the type 'unsigned long long int' exists but is only 32 bits | ||
63 | # large (as on some very old compilers), AC_TYPE_UNSIGNED_LONG_LONG_INT | ||
64 | # will not be defined. In this case you can treat 'unsigned long long int' | ||
65 | # like 'unsigned long int'. | ||
66 | |||
67 | AC_DEFUN([AC_TYPE_UNSIGNED_LONG_LONG_INT], | ||
41 | [ | 68 | [ |
42 | AC_REQUIRE([AC_TYPE_LONG_LONG_INT]) | 69 | AC_CACHE_CHECK([for unsigned long long int], |
43 | ac_cv_type_long_long=$ac_cv_type_long_long_int | 70 | [ac_cv_type_unsigned_long_long_int], |
44 | if test $ac_cv_type_long_long = yes; then | 71 | [ac_cv_type_unsigned_long_long_int=yes |
45 | AC_DEFINE(HAVE_LONG_LONG, 1, | 72 | if test "x${ac_cv_prog_cc_c99-no}" = xno; then |
46 | [Define if you have the 'long long' type.]) | 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'.]) | ||
47 | fi | 81 | fi |
48 | ]) | 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 | ]) | ||