What is the name of CMake's default build target?

I have a custom target, and I want it to depend on the default target (the one that is built with make).

add_custom_target(foo ....)
add_dependency(foo default_target_name_goes_here)

What is the name of the default target?

I've tried ALL, ALL_BUILD, MyProjectsName, DEFAULT,...

Finding anything in the CMake documentation is always an unsuccessful adventure...