CMAKE_PROJECT_NAME

The name of the top level project.

This variable holds the name of the project as specified in the top level CMakeLists.txt file by a project() command. In the event that the top level CMakeLists.txt contains multiple project() calls, the most recently called one from that top level CMakeLists.txt will determine the name that CMAKE_PROJECT_NAME contains. For example, consider the following top level CMakeLists.txt:

cmake_minimum_required(VERSION 3.0)
project(First)
project(Second)
add_subdirectory(sub)
project(Third)

And sub/CMakeLists.txt with the following contents:

project(SubProj)
message("CMAKE_PROJECT_NAME = ${CMAKE_PROJECT_NAME}")

The most recently seen project() command from the top level CMakeLists.txt would be project(Second), so this will print:

CMAKE_PROJECT_NAME = Second

To obtain the name from the most recent call to project() in the current directory scope or above, see the PROJECT_NAME variable.