X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fulonglong.m4;h=e2fbb552613730441527ba7ccbd2b74d3d1fc2c6;hb=4360528b84a6126535eed6a168f5922645286544;hp=afc765a3eee2966dd06cf6a987cbf0e54d7217cd;hpb=5ee5377428346fa4f04fd2f12a68991bbaeb418c;p=gnulib.git

diff --git a/m4/ulonglong.m4 b/m4/ulonglong.m4
index afc765a3e..e2fbb5526 100644
--- a/m4/ulonglong.m4
+++ b/m4/ulonglong.m4
@@ -1,12 +1,13 @@
-#serial 1
+#serial 2
 
 dnl From Paul Eggert.
 
 AC_DEFUN(jm_AC_TYPE_UNSIGNED_LONG_LONG,
 [
   AC_CACHE_CHECK([for unsigned long long], ac_cv_type_unsigned_long_long,
-  [AC_TRY_COMPILE([],
-    [unsigned long long i = (unsigned long long) -1;],
+  [AC_TRY_LINK([unsigned long long ull = 1; 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