CMAKE_PROJECT_COMPAT_VERSION

Added in version 4.1.

Note

Experimental. Gated by CMAKE_EXPERIMENTAL_EXPORT_PACKAGE_INFO.

The compatibility version of the top level project.

This variable holds the compatibility version 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_COMPAT_VERSION contains. For example, consider the following top level CMakeLists.txt:

cmake_minimum_required(VERSION 4.1)
project(First VERSION 9.0 COMPAT_VERSION 1.2.3)
project(Second VERSION 9.0 COMPAT_VERSION 3.4.5)
add_subdirectory(sub)
project(Third VERSION 9.0 COMPAT_VERSION 6.7.8)

And sub/CMakeLists.txt with the following contents:

project(SubProj VERSION 2.0 COMPAT_VERSION 1.0)
message("CMAKE_PROJECT_COMPAT_VERSION = ${CMAKE_PROJECT_COMPAT_VERSION}")

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

CMAKE_PROJECT_COMPAT_VERSION = 3.4.5

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