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* [c++] default to C++17 for most builds

* more updates

* fix formatting

* [ROCm] add support for ROCm/HIP

- CMakeLists.txt ROCm updates, also replace glob with explicit file list
- initial warpSize interop changes
- helpers/hipify.sh script added
- .gitignore to ignore generated hip source files

* more rocm updates

- disable compiler warnings
- move PercentileDevice __device__ template function into header
- bug fixes for __host__ __define__ and __HIP__ preprocessor symbols

* more bug fixes

* warp 32 vs 64 updates

* lint fixes

* missing device_index variable

* accidental inclusion of hip headers

* copyright notice compliance

* Update CMakeLists.txt
Co-authored-by: James Lamb <jaylamb20@gmail.com>

* fix lint issue

* clean up

* Update CMakeLists.txt
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* Update CMakeLists.txt
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* clean up CMakeLists.txt

use WARPSIZE

* use WARPSIZE

* fix share buffer size

---------
Co-authored-by: shiyu1994 <shiyu_k1994@qq.com>
Co-authored-by: James Lamb <jaylamb20@gmail.com>
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>
Co-authored-by: Yu Shi <yushi2@microsoft.com>

* remove src/treelearner/kernels

* Update CMakeLists.txt

* clean up

Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

Co-authored-by: James Lamb <jaylamb20@gmail.com>

Co-authored-by: James Lamb <jaylamb20@gmail.com>

[cmake] [R-package] include R-for-macOS vendored libs dir in OpenMP search path (fixes #6628) (#6629)
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* [cmake] consolidate set_target_properties() calls

* address review feedback

Co-authored-by: James Lamb <jaylamb20@gmail.com>

* [cmake] stop using file(GLOB)

* typo

* SOURCES is literally the function argument for swig_add_library()

[ci] Require CMake 3.28 and replace `FetchContent_Populate` with `FetchContent_MakeAvailable` (#6550)

* Replace `FetchContent_Populate` with `FetchContent_MakeAvailable`

* Test with VS 2022

* Update IntegratedOpenCL.cmake

* Update IntegratedOpenCL.cmake

* Update IntegratedOpenCL.cmake

* Update IntegratedOpenCL.cmake

* Update IntegratedOpenCL.cmake

* Update .vsts-ci.yml

* bump minimum CMake version

* force symlinking

* fix line length

* install curl

* install sudo

* install certs

* install CMake for R Windows jobs

* debug cmake

* new try

* remove CMake from RTools

* cleanup

* remove duplicted curl installation

* CMake version as variable

[R-package] [c++] add tighter multithreading control, avoid global OpenMP side effects (fixes #4705, fixes #5102) (#6226)