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authorPawel Kowalski <p.kowalski2@partner.samsung.com>2019-08-28 14:31:23 +0200
committerPawel Kowalski <p.kowalski2@partner.samsung.com>2019-08-28 16:56:31 +0200
commitdee455252ad321c660b411b4ecd65aa5e08f8fc1 (patch)
treeb55f9ec039e963e42605e9e9bdc186354cf9df42 /m4-gl/longlong.m4
parent5c7e0aaf17a296535495e3431db6a86ad64064b3 (diff)
parent26bea900a531662c6028ecc06f4adea825658434 (diff)
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Change-Id: I6d4b47b2072db8e7c45daa6e269e2f0cc6f54a7f
Diffstat (limited to 'm4-gl/longlong.m4')
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diff --git a/m4-gl/longlong.m4 b/m4-gl/longlong.m4
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+# longlong.m4 serial 18
+dnl Copyright (C) 1999-2007, 2009-2019 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+dnl From Paul Eggert.
+
+AC_PREREQ([2.62])
+
+# Define HAVE_LONG_LONG_INT if 'long long int' works.
+# This can be faster than what's in Autoconf 2.62 through 2.68.
+
+# Note: If the type 'long long int' exists but is only 32 bits large
+# (as on some very old compilers), HAVE_LONG_LONG_INT will not be
+# defined. In this case you can treat 'long long int' like 'long int'.
+
+AC_DEFUN([AC_TYPE_LONG_LONG_INT],
+[
+ AC_REQUIRE([AC_TYPE_UNSIGNED_LONG_LONG_INT])
+ AC_CACHE_CHECK([for long long int], [ac_cv_type_long_long_int],
+ [ac_cv_type_long_long_int=yes
+ if test "x${ac_cv_prog_cc_c99-no}" = xno; then
+ ac_cv_type_long_long_int=$ac_cv_type_unsigned_long_long_int
+ if test $ac_cv_type_long_long_int = yes; then
+ dnl Catch a bug in Tandem NonStop Kernel (OSS) cc -O circa 2004.
+ dnl If cross compiling, assume the bug is not important, since
+ dnl nobody cross compiles for this platform as far as we know.
+ AC_RUN_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[@%:@include <limits.h>
+ @%:@ifndef LLONG_MAX
+ @%:@ define HALF \
+ (1LL << (sizeof (long long int) * CHAR_BIT - 2))
+ @%:@ define LLONG_MAX (HALF - 1 + HALF)
+ @%:@endif]],
+ [[long long int n = 1;
+ int i;
+ for (i = 0; ; i++)
+ {
+ long long int m = n << i;
+ if (m >> i != n)
+ return 1;
+ if (LLONG_MAX / 2 < m)
+ break;
+ }
+ return 0;]])],
+ [],
+ [ac_cv_type_long_long_int=no],
+ [:])
+ fi
+ fi])
+ if test $ac_cv_type_long_long_int = yes; then
+ AC_DEFINE([HAVE_LONG_LONG_INT], [1],
+ [Define to 1 if the system has the type 'long long int'.])
+ fi
+])
+
+# Define HAVE_UNSIGNED_LONG_LONG_INT if 'unsigned long long int' works.
+# This can be faster than what's in Autoconf 2.62 through 2.68.
+
+# Note: If the type 'unsigned long long int' exists but is only 32 bits
+# large (as on some very old compilers), AC_TYPE_UNSIGNED_LONG_LONG_INT
+# will not be defined. In this case you can treat 'unsigned long long int'
+# like 'unsigned long int'.
+
+AC_DEFUN([AC_TYPE_UNSIGNED_LONG_LONG_INT],
+[
+ AC_CACHE_CHECK([for unsigned long long int],
+ [ac_cv_type_unsigned_long_long_int],
+ [ac_cv_type_unsigned_long_long_int=yes
+ if test "x${ac_cv_prog_cc_c99-no}" = xno; then
+ AC_LINK_IFELSE(
+ [_AC_TYPE_LONG_LONG_SNIPPET],
+ [],
+ [ac_cv_type_unsigned_long_long_int=no])
+ fi])
+ if test $ac_cv_type_unsigned_long_long_int = yes; then
+ AC_DEFINE([HAVE_UNSIGNED_LONG_LONG_INT], [1],
+ [Define to 1 if the system has the type 'unsigned long long int'.])
+ fi
+])
+
+# Expands to a C program that can be used to test for simultaneous support
+# of 'long long' and 'unsigned long long'. We don't want to say that
+# 'long long' is available if 'unsigned long long' is not, or vice versa,
+# because too many programs rely on the symmetry between signed and unsigned
+# integer types (excluding 'bool').
+AC_DEFUN([_AC_TYPE_LONG_LONG_SNIPPET],
+[
+ AC_LANG_PROGRAM(
+ [[/* For now, do not test the preprocessor; as of 2007 there are too many
+ implementations with broken preprocessors. Perhaps this can
+ be revisited in 2012. In the meantime, code should not expect
+ #if to work with literals wider than 32 bits. */
+ /* Test literals. */
+ long long int ll = 9223372036854775807ll;
+ long long int nll = -9223372036854775807LL;
+ unsigned long long int ull = 18446744073709551615ULL;
+ /* Test constant expressions. */
+ typedef int a[((-9223372036854775807LL < 0 && 0 < 9223372036854775807ll)
+ ? 1 : -1)];
+ typedef int b[(18446744073709551615ULL <= (unsigned long long int) -1
+ ? 1 : -1)];
+ int i = 63;]],
+ [[/* Test availability of runtime routines for shift and division. */
+ long long int llmax = 9223372036854775807ll;
+ unsigned long long int ullmax = 18446744073709551615ull;
+ return ((ll << 63) | (ll >> 63) | (ll < i) | (ll > i)
+ | (llmax / ll) | (llmax % ll)
+ | (ull << 63) | (ull >> 63) | (ull << i) | (ull >> i)
+ | (ullmax / ull) | (ullmax % ull));]])
+])