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jeremybenn |
# longlong.m4 serial 13
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dnl Copyright (C) 1999-2007, 2009, 2010 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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dnl From Paul Eggert.
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# Define HAVE_LONG_LONG_INT if 'long long int' works.
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# This fixes a bug in Autoconf 2.61, but can be removed once we
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# assume 2.62 everywhere.
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# Note: If the type 'long long int' exists but is only 32 bits large
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# (as on some very old compilers), HAVE_LONG_LONG_INT will not be
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# defined. In this case you can treat 'long long int' like 'long int'.
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AC_DEFUN([AC_TYPE_LONG_LONG_INT],
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[
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AC_CACHE_CHECK([for long long int], [ac_cv_type_long_long_int],
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[AC_LINK_IFELSE(
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[_AC_TYPE_LONG_LONG_SNIPPET],
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[dnl This catches a bug in Tandem NonStop Kernel (OSS) cc -O circa 2004.
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dnl If cross compiling, assume the bug isn't important, since
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dnl nobody cross compiles for this platform as far as we know.
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AC_RUN_IFELSE(
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[AC_LANG_PROGRAM(
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[[@%:@include <limits.h>
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@%:@ifndef LLONG_MAX
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@%:@ define HALF \
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(1LL << (sizeof (long long int) * CHAR_BIT - 2))
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@%:@ define LLONG_MAX (HALF - 1 + HALF)
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@%:@endif]],
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[[long long int n = 1;
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int i;
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for (i = 0; ; i++)
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{
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long long int m = n << i;
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if (m >> i != n)
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return 1;
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if (LLONG_MAX / 2 < m)
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break;
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}
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return 0;]])],
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[ac_cv_type_long_long_int=yes],
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[ac_cv_type_long_long_int=no],
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[ac_cv_type_long_long_int=yes])],
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[ac_cv_type_long_long_int=no])])
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if test $ac_cv_type_long_long_int = yes; then
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AC_DEFINE([HAVE_LONG_LONG_INT], 1,
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[Define to 1 if the system has the type `long long int'.])
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fi
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])
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# Define HAVE_UNSIGNED_LONG_LONG_INT if 'unsigned long long int' works.
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# This fixes a bug in Autoconf 2.61, but can be removed once we
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# assume 2.62 everywhere.
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# Note: If the type 'unsigned long long int' exists but is only 32 bits
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# large (as on some very old compilers), AC_TYPE_UNSIGNED_LONG_LONG_INT
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# will not be defined. In this case you can treat 'unsigned long long int'
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# like 'unsigned long int'.
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AC_DEFUN([AC_TYPE_UNSIGNED_LONG_LONG_INT],
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[
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AC_CACHE_CHECK([for unsigned long long int],
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[ac_cv_type_unsigned_long_long_int],
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[AC_LINK_IFELSE(
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[_AC_TYPE_LONG_LONG_SNIPPET],
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[ac_cv_type_unsigned_long_long_int=yes],
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[ac_cv_type_unsigned_long_long_int=no])])
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if test $ac_cv_type_unsigned_long_long_int = yes; then
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AC_DEFINE([HAVE_UNSIGNED_LONG_LONG_INT], 1,
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[Define to 1 if the system has the type `unsigned long long int'.])
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fi
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])
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# Expands to a C program that can be used to test for simultaneous support
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# of 'long long' and 'unsigned long long'. We don't want to say that
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# 'long long' is available if 'unsigned long long' is not, or vice versa,
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# because too many programs rely on the symmetry between signed and unsigned
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# integer types (excluding 'bool').
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AC_DEFUN([_AC_TYPE_LONG_LONG_SNIPPET],
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[
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AC_LANG_PROGRAM(
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[[/* For now, do not test the preprocessor; as of 2007 there are too many
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implementations with broken preprocessors. Perhaps this can
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be revisited in 2012. In the meantime, code should not expect
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#if to work with literals wider than 32 bits. */
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/* Test literals. */
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long long int ll = 9223372036854775807ll;
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long long int nll = -9223372036854775807LL;
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unsigned long long int ull = 18446744073709551615ULL;
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/* Test constant expressions. */
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typedef int a[((-9223372036854775807LL < 0 && 0 < 9223372036854775807ll)
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? 1 : -1)];
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typedef int b[(18446744073709551615ULL <= (unsigned long long int) -1
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? 1 : -1)];
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int i = 63;]],
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[[/* Test availability of runtime routines for shift and division. */
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long long int llmax = 9223372036854775807ll;
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unsigned long long int ullmax = 18446744073709551615ull;
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return ((ll << 63) | (ll >> 63) | (ll < i) | (ll > i)
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| (llmax / ll) | (llmax % ll)
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| (ull << 63) | (ull >> 63) | (ull << i) | (ull >> i)
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| (ullmax / ull) | (ullmax % ull));]])
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])
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