[CI][MATLAB] libmexclass doesn't work with CMake 4.0.0

[kou]

Describe the bug, including details regarding any error messages, version, and platform.

https://github.com/apache/arrow/actions/runs/14242094035/job/39914141503#step:9:40

 CMake Error at build/_deps/libmexclass-src/libmexclass/cpp/CMakeLists.txt:1 (cmake_minimum_required):
  Compatibility with CMake < 3.5 has been removed from CMake.

  Update the VERSION argument <min> value.  Or, use the <min>...<max> syntax
  to tell CMake that the project requires at least <min> but has been updated
  to work with policies introduced by <max> or earlier.

  Or, add -DCMAKE_POLICY_VERSION_MINIMUM=3.5 to try configuring anyway.

We can solve this by:

1. Updating https://github.com/mathworks/libmexclass/blob/cac7c3630a086bd5ba41413af44c833cef189c09/libmexclass/cpp/CMakeLists.txt#L1 to 3.6.0 or later OR
2. Setting 3.5 to CMAKE_POLICY_VERSION_MINUMUM before FetchCotnent_MakeAvailable()

e.g.:

diff --git a/matlab/tools/cmake/BuildMatlabArrowInterface.cmake b/matlab/tools/cmake/BuildMatlabArrowInterface.cmake
index 27af19676b..185afee57a 100644
--- a/matlab/tools/cmake/BuildMatlabArrowInterface.cmake
+++ b/matlab/tools/cmake/BuildMatlabArrowInterface.cmake
@@ -113,6 +113,7 @@ FetchContent_Declare(
     GIT_TAG ${MATLAB_ARROW_LIBMEXCLASS_CLIENT_FETCH_CONTENT_GIT_TAG}
     SOURCE_SUBDIR ${MATLAB_ARROW_LIBMEXCLASS_CLIENT_FETCH_CONTENT_SOURCE_SUBDIR}
 )
+set(CMAKE_POLICY_VERSION_MINIMUM 3.5)
 FetchContent_MakeAvailable(
     ${MATLAB_ARROW_LIBMEXCLASS_CLIENT_FETCH_CONTENT_NAME}
 )

Component(s)

Continuous Integration, MATLAB

[kou]

@kevingurney @sgilmore10 Which approach in the description do you prefer? I feel that 1. is better if you can change soon. If it's difficult, we can use 2. as workaround.

[sgilmore10]

Hi @kou,

I prefer solution 1 as well. I'll update libmexclass's CMakeLists.txt to require version 3.6 at minimum.

Best,
Sarah

[kevingurney]

Thank you @kou and @sgilmore10.

I also prefer solution 1.

[kevingurney]

Pull request: #46033

[kevingurney]

Issue resolved by pull request 46033
#46033