GetTargets

How to get the list of targets the user entered on command line ?

SCons provides a convenient variable COMMAND_LINE_TARGETS containing the list of all targets specified on the command line.

This example shows how you can prevent a target ('.' in this case) from being used:

if '.' in COMMAND_LINE_TARGETS:
   print("error: You may not use the '.' target, please use 'all' or name a specific target.")
   Exit(1)

env = Environment()
env.Alias('all', ['.'])

Running SCons on this particular SConstruct will provide the following result:

$ scons .
scons: Reading SConscript files ...
error: You may not use the '.' target, please use 'all' or name a specific target.

$ scons all
scons: Reading SConscript files ...
scons: done reading SConscript files.
scons: Building targets ...
scons: 'all' is up to date.
scons: done building targets.

See also the BUILD_TARGETS for reading and changing the targets that SCons will try to build.