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- # 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
- ])
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