1 # longlong.m4 serial 5 2 dnl Copyright (C) 1999-2004 Free Software Foundation, Inc. 3 dnl This file is free software; the Free Software Foundation 4 dnl gives unlimited permission to copy and/or distribute it, 5 dnl with or without modifications, as long as this notice is preserved. 6 7 dnl From Paul Eggert. 8 9 # Define HAVE_LONG_LONG if 'long long' works. 10 11 AC_DEFUN([gl_AC_TYPE_LONG_LONG], 12 [ 13 AC_CACHE_CHECK([for long long], ac_cv_type_long_long, 14 [AC_TRY_LINK([long long ll = 1LL; int i = 63;], 15 [long long llmax = (long long) -1; 16 return ll << i | ll >> i | llmax / ll | llmax % ll;], 17 ac_cv_type_long_long=yes, 18 ac_cv_type_long_long=no)]) 19 if test $ac_cv_type_long_long = yes; then 20 AC_DEFINE(HAVE_LONG_LONG, 1, 21 [Define if you have the 'long long' type.]) 22 fi 23 ]) 24
