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CMAKE_PROJECT_COMPAT_VERSION
----------------------------
.. versionadded:: 4.3
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 :command:`project` command. In the
event that the top level CMakeLists.txt contains multiple :command:`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:
.. code-block:: cmake
cmake_minimum_required(VERSION 4.3)
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:
.. code-block:: cmake
project(SubProj VERSION 2.0 COMPAT_VERSION 1.0)
message("CMAKE_PROJECT_COMPAT_VERSION = ${CMAKE_PROJECT_COMPAT_VERSION}")
The most recently seen :command:`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 :command:`project`
in the current directory scope or above, see the
:variable:`PROJECT_COMPAT_VERSION` variable.
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