(jm_AC_TYPE_LONG_LONG): New macro.

diff --git a/m4/longlong.m4 b/m4/longlong.m4
index 44f7ce3..daa95c0 100644 (file)
--- a/m4/longlong.m4
+++ b/m4/longlong.m4
@@ -1,7 +1,25 @@
-#serial 3
+#serial 2
 
 dnl From Paul Eggert.
 
+# Define HAVE_LONG_LONG if 'long long' works.
+
+AC_DEFUN([jm_AC_TYPE_LONG_LONG],
+[
+  AC_CACHE_CHECK([for long long], ac_cv_type_long_long,
+  [AC_TRY_LINK([long long ll = 1; int i = 63;],
+    [long long llmax = (long long) -1;
+     return ll << i | ll >> i | llmax / ll | llmax % ll;],
+    ac_cv_type_long_long=yes,
+    ac_cv_type_long_long=no)])
+  if test $ac_cv_type_long_long = yes; then
+    AC_DEFINE(HAVE_LONG_LONG, 1,
+      [Define if you have the long long type.])
+  fi
+])
+
+# Define HAVE_UNSIGNED_LONG_LONG if 'unsigned long long' works.
+
 AC_DEFUN([jm_AC_TYPE_UNSIGNED_LONG_LONG],
 [
   AC_CACHE_CHECK([for unsigned long long], ac_cv_type_unsigned_long_long,