[CMake] Global build target for global post-build stage ?

[Eric BOIX]

	Dear cmake users,

I would like to launch a command after ALL the targets are build (think
of e.g. displaying a small message). I could achieve this with an 
ad-hoc ADD_CUSTOM_COMMAND( TARGET target POST_BUILD COMMAND ...)
at the condition of knowing the name of cmake's internal global build
target. Does such a target exist and is it documented somewhere ?
Is there another way of achieving this ?

	Yours,
	Eric Boix.