c++ - What are ALL_BUILD and ZERO_CHECK and do I need them?

Question

I've created a simple CMakeLists.txt:

cmake_minimum_required(VERSION 2.8)
project (HelloWorld)
add_executable (HelloWorld main.cpp)

When I generate a VS2012 or VS2010 project from CMake, however, I get these 2 additional entries - ALL_BUILD and ZERO_CHECK. I don't understand their purpose, do I need them?

Answer 1

From https://cmake.org/pipermail/cmake/2008-November/025448.html:

Armin Berres — 11/22/2008, 3:12:41 PM

ZERO_CHECK will rerun cmake. You can/should execute this after changing something on your CMake files.

ALL_BUILD is simply a target which builds all and everything project in the active solution, I guess one can compare it to "make all".