[CMake] Determining appropriate CMAKE_MINIMUM_REQUIRED

[Rob McDonald]

Is there a way to get cmake to report back an _actual_ minimum required
version?

Our project has lots of parts, and the CMakeLists.txt have not been very
well maintained.  Right now, CMAKE_MINIMUM_REQUIRED is set to different
values throughout, none of which are likely correct.

It seems like it 'ought to be possible' to run a new version of cmake and
have it report out actual values for CMAKE_MINIMUM_REQUIRED.

Is there any way to do this other than a manual audit?

Best,

Rob
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