Rebuild for r-base 4.4 and UCRT mingw toolchain

[regro-cf-autotick-bot]

This PR has been triggered in an effort to update r-base44_and_m2w64-ucrt.

Notes and instructions for merging this PR:

1. Please merge the PR only after the tests have passed.
2. Feel free to push to the bot's branch to update this PR if needed.

Please note that if you close this PR we presume that the feedstock has been rebuilt, so if you are going to perform the rebuild yourself don't close this PR until the your rebuild has been merged.

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[conda-forge-webservices[bot]]

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[jakirkham]

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[jakirkham]

Looks like there is an issue finding Windows OpenMP on CI:

CMake Error at D:/bld/xgboost-split_1722411873928/_build_env/Library/share/cmake-3.30/Modules/FindPackageHandleStandardArgs.cmake:233 (message):
  Could NOT find OpenMP_C (missing: OpenMP_C_FLAGS OpenMP_C_LIB_NAMES)
-- Configuring incomplete, errors occurred!

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[mfansler]

Thanks for working on this so far! ❤️

I just wanted to send a gentle nudge that it would be nice to see this resolved. Perhaps a motivator: xgboost is currently the heaviest node that the migrator is waiting on to merge.

[jakirkham]

Without a Windows machine to debug the remaining errors, this is pretty hard to progress on. If there is someone with an interest in this and a Windows machine available, would encourage them to dive in

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[trivialfis]

I think msvc doesn't handle the R C API header very well. It should be a commen issue for all r C extensions though, curious how others are doing.

[jakirkham]

Think we are using MinGW for R builds. That said, could very well have configuration issues that need updates in this PR

FWIW here is the current error on CI:

CMake Error at cmake/modules/FindLibR.cmake:48 (message):

  dlltool.exe not found!

  Do you have Rtools installed with its MinGW's bin/ in PATH?
Call Stack (most recent call first):
  cmake/modules/FindLibR.cmake:167 (create_rlib_for_msvc)
  R-package/CMakeLists.txt:1 (find_package)

[danielnachun]

The latest round of errors seem to indicate that the -lR LDFLAG is missing on Windows. There is a Makevars.win in the R-package subdirectory: https://github.com/dmlc/xgboost/blob/master/R-package/src/Makevars.win. However, this line in cmake/RPackageInstall.cmake.in may imply that Makevars.win is overwritten at build time: https://github.com/dmlc/xgboost/blob/8fe518600aad007dd5e50fecadd19ec44b15d235/cmake/RPackageInstall.cmake.in#L26.

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[danielnachun]

I made some progress here - in my local test I can get past the compilation failures now, though it gets stuck at later point now.

The two fixes that are needed are:

• add the argument -DLIBR_CORE_LIBRARY=%PREFIX%\lib\R\bin\x64\R.lib to the CMake arguments in install-r-xgboost.bat
• remove the # [not win] comment after make in meta.yaml in the build: section in meta.yaml under the r-xgboost package section.

I think the reason the first argument is needed is because CMake cannot find the R.lib in our r-base package and tries to make its own instead, which doesn't allow it to properly link the necessary symbols. If we provide the path to the correct R.lib then it seems to work.

[jakirkham]

Thanks Daniel! 🙏

Would you like to make a PR to this feedstock or the bot's fork's branch? 🙂

Maybe other folks will have ideas on the next error once we have it in CI here where it is easy to look at

[danielnachun]

I'll go ahead and start new PR so I also have push access.

[jakirkham]

Sounds good. Thanks Daniel! 🙏

Continued in PR: https://github.com/conda-forge/xgboost-feedstock/pull/196