configure: disable netloc by default in 2.0

Still too experimental

Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>

NEWS

@@ -90,8 +90,8 @@ Version 2.0.0
 * New APIs and Features
   + Add hwloc/shmem.h for sharing topologies between processes running on
     the same machine (for reducing the memory footprint).
-  + Add the experimental netloc subproject. It is enabled by default when
-    supported and can be disabled with --disable-netloc.
+  + Add the experimental netloc subproject. It is disabled by default
+    and can be enabled with --enable-netloc.
     It currently brings command-line tools to gather and visualize the
     topology of InfiniBand fabrics, and an API to convert such topologies
     into Scotch architectures for process mapping.

configure.ac

@@ -1,7 +1,7 @@
 # -*- shell-script -*-
 #
 # Copyright © 2009      CNRS
-# Copyright © 2009-2016 Inria.  All rights reserved.
+# Copyright © 2009-2017 Inria.  All rights reserved.
 # Copyright © 2009, 2011-2012      Université Bordeaux
 # Copyright © 2009-2014 Cisco Systems, Inc.  All rights reserved.
 #
@@ -143,10 +143,10 @@ AC_SUBST([libnetloc_so_version])
 
 AC_ARG_ENABLE([netloc],
               [AC_HELP_STRING([--enable-netloc],
-                              [The Netloc functionality is enabled by default, but will be silently skipped it if cannot be built (e.g., not supported on your platform).  Using --enable-netloc will cause configure to abort if Netloc cannot be build.  Using --disable-netloc will cause configure to skip attempting to build netloc at all.])
+                              [The Netloc functionality is disabled by default. Using --enable-netloc will cause configure to abort if Netloc cannot be build (e.g., not supported on your platform).])
               ])
 
-AS_IF([test "$enable_netloc" != "no"],
+AS_IF([test "$enable_netloc" = "yes"],
       [NETLOC_SETUP_CORE([], [],
            [AS_IF([test "$enable_netloc" = "yes"],
                   [AC_MSG_ERROR([Cannot build netloc core])])