Using multi-platform configuration as described in the previous sections will run the configuration commands even when invoking scons -c to clean targets:

% scons -Q -c
Checking for MyLibrary... yes
Removed foo.o
Removed foo
    

Although running the platform checks when removing targets doesn't hurt anything, it's usually unnecessary. You can avoid this by using the GetOption method to check whether the -c (clean) option has been invoked on the command line:

env = Environment()
if not env.GetOption('clean'):
    conf = Configure(env, custom_tests={'CheckMyLibrary': CheckMyLibrary})
    if not conf.CheckMyLibrary():
        print('MyLibrary is not installed!')
        Exit(1)
    env = conf.Finish()
    

% scons -Q -c
Removed foo.o
Removed foo