CMAKE_PROJECT_HOMEPAGE_URL

Added in version 3.12.

The homepage URL of the top level project.

This variable holds the homepage URL 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 value that CMAKE_PROJECT_HOMEPAGE_URL contains. For example, consider the following top level CMakeLists.txt:

cmake_minimum_required(VERSION 3.0)
project(First HOMEPAGE_URL "https://first.example.com")
project(Second HOMEPAGE_URL "https://second.example.com")
add_subdirectory(sub)
project(Third HOMEPAGE_URL "https://third.example.com")

And sub/CMakeLists.txt with the following contents:

project(SubProj HOMEPAGE_URL "https://subproj.example.com")
message("CMAKE_PROJECT_HOMEPAGE_URL = ${CMAKE_PROJECT_HOMEPAGE_URL}")

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

CMAKE_PROJECT_HOMEPAGE_URL = https://second.example.com

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