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

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++

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.

Newer CMake/Meson may fix this. Related issues:

This got fixed both ways:
with mesonbuild/meson@4e1e74b

cmake 4.4: test suite failure ERROR: Dependency "SomethingLikeZLIB" not found (tried cmake) mesonbuild/meson#16007

with CMake - Restore toleration of toolchain file setting internal variable

https://gitlab.kitware.com/cmake/cmake/-/work_items/27971

Failure log of Aug 4:

cmake                                         4.4.0               hc85cc9f_0              conda-forge
...
Run-time dependency azure-core-cpp found: NO  (tried pkg-config and cmake)
...
Downloading azure source from ...

Executing subproject azure method cmake

| Configuring the build directory with CMake version 4.4.0

Moved pass the failure point on Aug 5 (but failed later on unrelated point as reported and fixed in this PR #50781 (comment))
cmake 4.4.2 hc85cc9f_0 conda-forge
Run-time dependency azure-core-cpp (modules: Azure::azure-core) found: YES 1.16.3

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[C++] C++ Extra Meson build fails due to missing libxml2 for azure #50776

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[C++] C++ Extra Meson build fails due to missing libxml2 for azure #50776

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raulcd commented on Aug 3, 2026

kou commented on Aug 3, 2026

tadeja commented on Sep 11, 2026

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