To be or not to be ! As DR require 64 bits atomics, only allow it to

build when thread support is disabled or we have 64 bits atomics support.

This commit was SVN r17293.

ompi/mca/pml/dr/configure.m4

@@ -0,0 +1,23 @@
+# -*- shell-script -*-
+#
+# Copyright (c) 2004-2008 The Trustees of the University of Tennessee.
+#                         All rights reserved.
+# $COPYRIGHT$
+# 
+# Additional copyrights may follow
+# 
+# $HEADER$
+#
+
+# MCA_pml_dr_CONFIG([action-if-found], [action-if-not-found])
+# -----------------------------------------------------------
+AC_DEFUN([MCA_pml_dr_CONFIG],[
+    # Dont compile DR if threading is enabled but there is no
+    # support for 64 bits atomics.
+    AS_IF([test $OMPI_ASM_SUPPORT_64BIT -eq 1],
+        [$1],
+        [AS_IF([test $OMPI_ENABLE_PROGRESS_THREADS -eq 1 -o $OMPI_ENABLE_MPI_THREADS -eq 1],
+               [$2],
+               [$1])
+        ])
+])dnl