[Boost-build] Changing user-config.jam after b2 command

Subject: [Boost-build] Changing user-config.jam after b2 command
From: Edward Diener (eldiener_at_[hidden])
Date: 2018-01-02 23:49:32

After issuing a b2 command, can user-config.jam be changed without 
affecting the original b2 command ? In other words does the b2 command 
cache all the information it needs from user-config.jam so that changing 
user-config.jam will not affect any further processing of the b2 command 
? If so, at what point in the output of the b2 command can I know that I 
can change user-config.jam without affecting the b2 command processing ?