How to run Rake tasks from within Rake tasks?

I have a Rakefile that compiles the project in two ways, according to the global variable $build_type, which can be :debug or :release (the results go in separate directories): task :build => [:some_other_tasks] do end I wish to create a task that compiles the project with both configurations in turn, something like this: task :build_all do [ :debug, :release ].each do |t| $build_type = t # call t

[keyesberry]

execute, invoke

[labocho]

rake タスク内から別のタスクを呼び出す方法各種