[C++] C++ Extra Meson build fails due to missing libxml2 for azure

[raulcd]

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

Since the 22nd of July the C++ Extra Meson build has been failing with:

| -- AZ_LIBRARY_VERSION
| Vcpkg integrate step.
| Vcpkg integrate step - DONE.
| CMake Error at /opt/conda/envs/arrow/share/cmake-4.4/Modules/FindPackageHandleStandardArgs.cmake:290 (message):
| Could NOT find LibXml2 (missing: LIBXML2_LIBRARY LIBXML2_INCLUDE_DIR)
| Call Stack (most recent call first):
| /opt/conda/envs/arrow/share/cmake-4.4/Modules/FindPackageHandleStandardArgs.cmake:654 (_FPHSA_FAILURE_MESSAGE)
| /opt/conda/envs/arrow/share/cmake-4.4/Modules/FindLibXml2.cmake:181 (find_package_handle_standard_args)
| sdk/storage/azure-storage-common/CMakeLists.txt:102 (find_package)


| -- Configuring incomplete, errors occurred!

azure| CMake configuration: FAILED

../../arrow/cpp/src/arrow/meson.build:399:31: ERROR: Failed to configure the CMake subproject: Could NOT find LibXml2 (missing: LIBXML2_LIBRARY LIBXML2_INCLUDE_DIR) 

A full log can be found at /build/cpp/meson-logs/meson-log.txt

Link to the first failure:

• https://github.com/apache/arrow/actions/runs/29880688862/job/88800704317

Component(s)

C++

[raulcd]

This seems to be related to the CMake 4.4 upgrade on conda but pinning CMake shouldn't be the solution in my opinion because CMake 4.4 works if used in isolation and without meson.

I am unsure what to do with this one.

[kou]

Newer CMake/Meson may fix this. Related issues:

• cmake 4.4: test suite failure ERROR: Dependency "SomethingLikeZLIB" not found (tried cmake) mesonbuild/meson#16007
• https://gitlab.kitware.com/cmake/cmake/-/work_items/27971