document the enable_msg build-time flag

diff --git a/docs/source/Installing_SimGrid.rst b/docs/source/Installing_SimGrid.rst
index 4aa0531..fec0241 100644 (file)
--- a/docs/source/Installing_SimGrid.rst
+++ b/docs/source/Installing_SimGrid.rst
@@ -244,7 +244,8 @@ enable_documentation (on/OFF)
   version for now.
 
 enable_java (on/OFF)
   version for now.
 
 enable_java (on/OFF)

-  Generates the java bindings of SimGrid.
+  Generates the java bindings of SimGrid. You must also enable MSG for
+  this to work.

 
 enable_jedule (on/OFF)
   Produces execution traces from SimDag simulations, which can then be visualized with the
 
 enable_jedule (on/OFF)
   Produces execution traces from SimDag simulations, which can then be visualized with the


@@ -273,6 +274,9 @@ enable_model-checking (on/OFF)
   simulation speed** even when the model checker is not activated at
   run time.
 
   simulation speed** even when the model checker is not activated at
   run time.
 

+enable_msg (on/OFF)
+  Activates the :ref:`MSG <MSG_doc>` legacy interface.
+

 enable_ns3 (on/OFF)
   Activates the ns-3 bindings. See section :ref:`model_ns3`.
 
 enable_ns3 (on/OFF)
   Activates the ns-3 bindings. See section :ref:`model_ns3`.
 

diff --git a/docs/source/app_msg.rst b/docs/source/app_msg.rst
index dbf2749..432b505 100644 (file)
--- a/docs/source/app_msg.rst
+++ b/docs/source/app_msg.rst
@@ -9,7 +9,10 @@ The MSG Interface (legacy interface)
    the process of releasing SimGrid 4. So MSG is frozen and will
    probably never evolve. If you are starting a new project, you
    should consider S4U instead. Note that the support for MSG will not
    the process of releasing SimGrid 4. So MSG is frozen and will
    probably never evolve. If you are starting a new project, you
    should consider S4U instead. Note that the support for MSG will not

-   be removed from SimGrid before 2020 at least.
+   be removed from SimGrid before 2020Q4 or 2021Q1.
+
+   This interface is disabled by default. Pass -Denable_msg=ON to
+   cmake if you still need it.

 
 MSG is a simple API to write algorithms organized with Concurrent
 Sequential Processes (CSP) that interact by exchanging messages. It
 
 MSG is a simple API to write algorithms organized with Concurrent
 Sequential Processes (CSP) that interact by exchanging messages. It