@%:@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 $ac_cv_type_long_long_int = yes; then
AC_DEFINE([HAVE_LONG_LONG_INT], [1],
[Define to 1 if the system has the type 'long long int'.])
fi
])
# Define HAVE_UNSIGNED_LONG_LONG_INT if 'unsigned long long int' works.
# This fixes a bug in Autoconf 2.61, and can be faster
# than what's in Autoconf 2.62 through 2.68.
# Note: If the type 'unsigned long long int' exists but is only 32 bits
# large (as on some very old compilers), AC_TYPE_UNSIGNED_LONG_LONG_INT
# will not be defined. In this case you can treat 'unsigned long long int'
# like 'unsigned long int'.
AC_DEFUN([AC_TYPE_UNSIGNED_LONG_LONG_INT],
[
AC_CACHE_CHECK([for unsigned long long int],
[ac_cv_type_unsigned_long_long_int],
[ac_cv_type_unsigned_long_long_int=yes
if test "x${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));]])
])