CMake Cookbook

There is more

We will explore in detail the flexibility of the ExternalProject_Add command in the following recipes. Sometimes, however, the external project we want to use might require additional, non-standard steps to be performed. For this reason, the ExternalProject.cmake module defines the following additional commands:

1. ExternalProject_Add_Step. Once an external project has been added, this command allows to latch additional commands on it as custom steps. See also: https://cmake.org/cmake/help/v3.5/module/ExternalProject.html#command:externalproject_add_step
2. ExternalProject_Add_StepTargets. Lets you define steps, for example the build and test steps, in any external project as separate targets. This means that one can trigger these ...