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ulonglong.m4
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2005-07-26
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909b
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24 lines
# ulonglong.m4 serial 4
dnl Copyright (C) 1999-2004 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.
# Define HAVE_UNSIGNED_LONG_LONG if 'unsigned long long' works.
AC_DEFUN([gl_AC_TYPE_UNSIGNED_LONG_LONG],
[
AC_CACHE_CHECK([for unsigned long long], ac_cv_type_unsigned_long_long,
[AC_TRY_LINK([unsigned long long ull = 1ULL; int i = 63;],
[unsigned long long ullmax = (unsigned long long) -1;
return ull << i | ull >> i | ullmax / ull | ullmax % ull;],
ac_cv_type_unsigned_long_long=yes,
ac_cv_type_unsigned_long_long=no)])
if test $ac_cv_type_unsigned_long_long = yes; then
AC_DEFINE(HAVE_UNSIGNED_LONG_LONG, 1,
[Define if you have the 'unsigned long long' type.])
fi
])