Merge branch 'master' into rocm3

.appveyor.yml

 version: 4.6.0.99.{build}
 
-image: Visual Studio 2015
+image: Visual Studio 2017
 platform: x64
 configuration:
   - '3.9'

.ci/setup.sh

@@ -153,7 +153,7 @@ if [[ "${TASK}" != "cpp-tests" ]] && [[ "${TASK}" != "r-package" ]]; then
         sh miniforge.sh -b -p "${CONDA}"
     fi
     conda config --set always_yes yes --set changeps1 no
-    conda update -q -y conda
+    conda update -q -y conda conda-libmamba-solver
 
     # print output of 'conda info', to help in submitting bug reports
     echo "conda info:"

.ci/test-r-package.sh

@@ -153,6 +153,10 @@ elif [[ $R_BUILD_TYPE == "cran" ]]; then
     cd "${R_CMD_CHECK_DIR}"
 fi
 
+if [[ $PRODUCES_ARTIFACTS == "true" ]]; then
+    cp "${PKG_TARBALL}" "${BUILD_ARTIFACTSTAGINGDIRECTORY}/lightgbm-${LGB_VER}-r-cran.tar.gz"
+fi
+
 declare -i allowed_notes=0
 bash "${BUILD_DIRECTORY}/.ci/run-r-cmd-check.sh" \
     "${PKG_TARBALL}" \

.ci/test-windows.ps1

@@ -66,7 +66,7 @@ if ($env:TASK -eq "swig") {
 conda init powershell
 conda activate
 conda config --set always_yes yes --set changeps1 no
-conda update -q -y conda "python=$env:PYTHON_VERSION[build=*_cp*]"
+conda update -q -y conda conda-libmamba-solver "python=$env:PYTHON_VERSION[build=*_cp*]"
 
 # print output of 'conda info', to help in submitting bug reports
 Write-Output "conda info:"

.ci/test.sh

@@ -13,6 +13,9 @@ ARCH=$(uname -m)
 
 LGB_VER=$(head -n 1 "${BUILD_DIRECTORY}/VERSION.txt")
 
+# create the artifact upload directory if it doesn't exist yet
+mkdir -p "${BUILD_ARTIFACTSTAGINGDIRECTORY}"
+
 if [[ $OS_NAME == "macos" ]] && [[ $COMPILER == "gcc" ]]; then
     export CXX=g++-14
     export CC=gcc-14

.github/workflows/cuda.yml

@@ -74,9 +74,11 @@ jobs:
         uses: actions/checkout@v5
         with:
           fetch-depth: 5
+          persist-credentials: false
           submodules: true
       - name: Setup and run tests
         run: |
+          export BUILD_ARTIFACTSTAGINGDIRECTORY="${{ github.workspace }}/artifacts"
           export BUILD_DIRECTORY="$GITHUB_WORKSPACE"
           export PATH=$CONDA/bin:$PATH
 

.github/workflows/linkchecker.yml

@@ -21,6 +21,7 @@ jobs:
         uses: actions/checkout@v5
         with:
           fetch-depth: 5
+          persist-credentials: false
           submodules: false
       - name: Setup and run tests
         run: |

.github/workflows/optional_checks.yml

@@ -14,6 +14,7 @@ jobs:
         uses: actions/checkout@v5
         with:
           fetch-depth: 5
+          persist-credentials: false
           submodules: false
       - name: Check that all tests succeeded
         shell: bash

.github/workflows/python_package.yml

@@ -14,6 +14,9 @@ concurrency:
   cancel-in-progress: true
 
 env:
+  # tell scripts where to put artifacts
+  # (this variable name is left over from when jobs ran on Azure DevOps)
+  BUILD_ARTIFACTSTAGINGDIRECTORY: '${{ github.workspace }}/artifacts'
   CMAKE_BUILD_PARALLEL_LEVEL: 4
   SKBUILD_STRICT_CONFIG: true
 
@@ -27,6 +30,7 @@ jobs:
         uses: actions/checkout@v5
         with:
           fetch-depth: 5
+          persist-credentials: false
           submodules: true
       - name: Setup and run tests
         shell: bash
@@ -106,6 +110,7 @@ jobs:
         uses: actions/checkout@v5
         with:
           fetch-depth: 5
+          persist-credentials: false
           submodules: true
       - name: Setup and run tests
         shell: bash
@@ -140,6 +145,7 @@ jobs:
         uses: actions/checkout@v5
         with:
           fetch-depth: 5
+          persist-credentials: false
           submodules: true
       - name: Create wheel
         run: |
@@ -174,6 +180,7 @@ jobs:
         uses: actions/checkout@v5
         with:
           fetch-depth: 5
+          persist-credentials: false
           submodules: true
       - name: Create wheel
         run: |

.github/workflows/r_package.yml

@@ -14,6 +14,9 @@ concurrency:
   cancel-in-progress: true
 
 env:
+  # tell scripts where to put artifacts
+  # (this variable name is left over from when jobs ran on Azure DevOps)
+  BUILD_ARTIFACTSTAGINGDIRECTORY: '${{ github.workspace }}/artifacts'
   # in CMake-driven builds, parallelize compilation
   CMAKE_BUILD_PARALLEL_LEVEL: 4
   # on Debian-based images, avoid interactive prompts
@@ -114,6 +117,8 @@ jobs:
             r_version: 4.3
             build_type: cran
             container: 'ubuntu:22.04'
+            produces-artifacts: 'true'
+            artifact-name: r-cran-package
           - os: macos-13
             task: r-package
             compiler: clang
@@ -160,6 +165,7 @@ jobs:
         uses: actions/checkout@v5
         with:
           fetch-depth: 5
+          persist-credentials: false
           submodules: true
       - name: Install pandoc
         uses: r-lib/actions/setup-pandoc@v2
@@ -182,6 +188,8 @@ jobs:
               export IN_UBUNTU_BASE_CONTAINER="true"
           fi
           export BUILD_DIRECTORY="$GITHUB_WORKSPACE"
+          export LGB_VER=$(head -n 1 "${BUILD_DIRECTORY}/VERSION.txt")
+          export PRODUCES_ARTIFACTS="${{ matrix.produces-artifacts }}"
           export R_VERSION="${{ matrix.r_version }}"
           export R_BUILD_TYPE="${{ matrix.build_type }}"
           $GITHUB_WORKSPACE/.ci/setup.sh
@@ -198,6 +206,13 @@ jobs:
           $env:COMPILER = "${{ matrix.compiler }}"
           $env:TASK = "${{ matrix.task }}"
           & "$env:GITHUB_WORKSPACE/.ci/test-windows.ps1"
+      - name: Upload artifacts
+        if: ${{ matrix.produces-artifacts == 'true' }}
+        uses: actions/upload-artifact@v4
+        with:
+          name: ${{ matrix.artifact-name }}
+          path: ${{ env.BUILD_ARTIFACTSTAGINGDIRECTORY }}/*.tar.gz
+          if-no-files-found: error
   test-r-sanitizers:
     name: r-sanitizers (ubuntu-latest, R-devel, ${{ matrix.compiler }} ASAN/UBSAN)
     timeout-minutes: 60
@@ -219,6 +234,7 @@ jobs:
         uses: actions/checkout@v5
         with:
           fetch-depth: 5
+          persist-credentials: false
           submodules: true
       - name: Install packages
         shell: bash
@@ -259,6 +275,7 @@ jobs:
         uses: actions/checkout@v5
         with:
           fetch-depth: 5
+          persist-credentials: false
           submodules: true
       - name: Install pandoc
         uses: r-lib/actions/setup-pandoc@v2

.github/workflows/r_valgrind.yml

@@ -28,6 +28,7 @@ jobs:
         with:
           fetch-depth: 5
           submodules: true
+          persist-credentials: false
           repository: microsoft/LightGBM
           ref: "refs/pull/${{ github.event.client_payload.pr_number }}/merge"
       - name: Send init status

.github/workflows/static_analysis.yml

@@ -30,6 +30,7 @@ jobs:
         uses: actions/checkout@v5
         with:
           fetch-depth: 5
+          persist-credentials: false
           submodules: false
       - name: Setup and run tests
         shell: bash
@@ -48,6 +49,7 @@ jobs:
         uses: actions/checkout@v5
         with:
           fetch-depth: 5
+          persist-credentials: false
           submodules: false
       - name: Setup and run tests
         shell: bash
@@ -70,6 +72,7 @@ jobs:
         uses: actions/checkout@v5
         with:
           fetch-depth: 5
+          persist-credentials: false
           submodules: true
       - name: Install packages
         shell: bash

.github/workflows/triggering_comments.yml

@@ -18,6 +18,7 @@ jobs:
         uses: actions/checkout@v5
         with:
           fetch-depth: 5
+          persist-credentials: false
           submodules: false
 
       - name: Trigger R valgrind tests

.vsts-ci.yml

@@ -331,33 +331,6 @@ jobs:
           pathtoPublish: '$(Build.ArtifactStagingDirectory)'
           artifactName: PackageAssets
           artifactType: container
-  ##############
-  # R_artifact #
-  ##############
-  - job: R_artifact
-    condition: not(startsWith(variables['Build.SourceBranch'], 'refs/pull/'))
-    pool:
-      vmImage: 'ubuntu-22.04'
-    container: rbase
-    steps:
-      - script: |
-          git clean -d -f -x
-        displayName: 'Clean source directory'
-      - script: |
-          LGB_VER=$(head -n 1 VERSION.txt | sed "s/rc/-/g")
-          R_LIB_PATH=~/Rlib
-          export R_LIBS=${R_LIB_PATH}
-          mkdir -p ${R_LIB_PATH}
-          RDscript .ci/install-r-deps.R --build --include=RhpcBLASctl || exit 1
-          sh build-cran-package.sh --r-executable=RD || exit 1
-          mv lightgbm_${LGB_VER}.tar.gz $(Build.ArtifactStagingDirectory)/lightgbm-${LGB_VER}-r-cran.tar.gz
-        displayName: 'Build CRAN R-package'
-      - task: PublishBuildArtifacts@1
-        condition: succeeded()
-        inputs:
-          pathtoPublish: $(Build.ArtifactStagingDirectory)
-          artifactName: R-package
-          artifactType: container
 
   ###########
   # Package #
@@ -368,7 +341,6 @@ jobs:
       - Linux_latest
       - macOS
       - Windows
-      - R_artifact
     condition: and(succeeded(), not(startsWith(variables['Build.SourceBranch'], 'refs/pull/')))
     pool:
       vmImage: 'ubuntu-22.04'
@@ -399,12 +371,6 @@ jobs:
         inputs:
           artifactName: PackageAssets
           downloadPath: $(Build.SourcesDirectory)/binaries
-      - task: DownloadBuildArtifacts@0
-        displayName: Download R-package
-        condition: and(succeeded(), startsWith(variables['Build.SourceBranch'], 'refs/tags/v'))
-        inputs:
-          artifactName: R-package
-          downloadPath: $(Build.SourcesDirectory)/R
       - script: |
           python "$(Build.SourcesDirectory)/.ci/create-nuget.py" "$(Build.SourcesDirectory)/binaries/PackageAssets"
         displayName: 'Create NuGet configuration files'
@@ -430,7 +396,6 @@ jobs:
           title: '$(Build.SourceBranchName)'
           assets: |
             $(Build.SourcesDirectory)/binaries/PackageAssets/*
-            $(Build.SourcesDirectory)/R/R-package/*
             $(Build.ArtifactStagingDirectory)/nuget/*.nupkg
             $(Build.ArtifactStagingDirectory)/archives/*
           assetUploadMode: 'delete'

R-package/README.md

@@ -128,6 +128,14 @@ If you want to force `LightGBM` to use MSYS2 (for any R version), pass `--use-ms
 Rscript build_r.R --use-msys2
 ```
 
+**MinGW**
+
+If you want to force `LightGBM` to use [MinGW](https://www.mingw-w64.org/) (for any R version), pass `--use-mingw` to the installation script.
+
+```shell
+Rscript build_r.R --use-mingw
+```
+
 #### Mac OS Preparation
 
 You can perform installation either with **Apple Clang** or **gcc**. In case you prefer **Apple Clang**, you should install **OpenMP** (details for installation can be found in [Installation Guide](https://github.com/microsoft/LightGBM/blob/master/docs/Installation-Guide.rst#apple-clang)) first. In case you prefer **gcc**, you need to install it (details for installation can be found in [Installation Guide](https://github.com/microsoft/LightGBM/blob/master/docs/Installation-Guide.rst#gcc)) and set some environment variables to tell R to use `gcc` and `g++`. If you install these from Homebrew, your versions of `g++` and `gcc` are most likely in `/usr/local/bin`, as shown below.

R-package/configure.win

@@ -11,7 +11,6 @@ CXX17=`"${R_EXE}" CMD config CXX17`
 CXX17STD=`"${R_EXE}" CMD config CXX17STD`
 CXX="${CXX17} ${CXX17STD}"
 CXXFLAGS=`"${R_EXE}" CMD config CXX17FLAGS`
-CXX_STD="CXX17"
 CPPFLAGS=`"${R_EXE}" CMD config CPPFLAGS`
 
 # LightGBM-specific flags
@@ -98,9 +97,6 @@ then
 fi
 
 # Generate Makevars.win from Makevars.win.in
-sed -e \
-    "s/@CXX_STD@/$CXX_STD/" \
-    < src/Makevars.win.in > src/Makevars.win
 sed -e \
     "s/@LGB_CPPFLAGS@/$LGB_CPPFLAGS/" \
     < src/Makevars.win.in > src/Makevars.win

R-package/src/Makevars.win.in

-CXX_STD = @CXX_STD@
+CXX_STD = CXX17
 
 PKGROOT=.
 

R-package/src/install.libs.R

@@ -15,8 +15,6 @@ if (.Machine$sizeof.pointer != 8L) {
   stop("LightGBM only supports 64-bit R, please check the version of R and Rtools.")
 }
 
-R_ver <- as.double(R.Version()$major) + as.double(R.Version()$minor) / 10.0
-
 # Get some paths
 source_dir <- file.path(R_PACKAGE_SOURCE, "src", fsep = "/")
 build_dir <- file.path(source_dir, "build", fsep = "/")
@@ -67,7 +65,6 @@ inst_dir <- file.path(R_PACKAGE_SOURCE, "inst", fsep = "/")
     "Visual Studio 17 2022"
     , "Visual Studio 16 2019"
     , "Visual Studio 15 2017"
-    , "Visual Studio 14 2015"
   )
   working_vs_version <- NULL
   for (vs_version in vs_versions) {
@@ -162,11 +159,7 @@ if (use_mingw) {
   # Rtools 4.0 moved from MinGW to MSYS toolchain. If user tries
   # Visual Studio install but that fails, fall back to the toolchain
   # supported in Rtools
-  if (R_ver >= 4.0) {
   windows_toolchain <- "MSYS2"
-  } else {
-    windows_toolchain <- "MinGW"
-  }
 }
 windows_build_tool <- WINDOWS_BUILD_TOOLS[[windows_toolchain]][["build_tool"]]
 windows_makefile_generator <- WINDOWS_BUILD_TOOLS[[windows_toolchain]][["makefile_generator"]]

R-package/tests/testthat/helper.R

@@ -39,7 +39,7 @@ data.table::setDTthreads(1L)
 # [description]
 #    test that every element of 'x' is in 'y'
 #
-#    testthat::expect_in() was added in {testthat} v3.1.19
+#    testthat::expect_in() was added in {testthat} v3.1.19.
 #    This is here to support a similar interface on older {testthat} versions.
 .expect_in <- function(x, y) {
   if (exists("expect_in")) {

cmake/IntegratedOpenCL.cmake

@@ -78,8 +78,6 @@ if(WIN32)
       set(MSVC_TOOLCHAIN_ID "142")
     elseif(${MSVC_VERSION} GREATER 1909)
       set(MSVC_TOOLCHAIN_ID "141")
-    elseif(${MSVC_VERSION} GREATER 1899)
-      set(MSVC_TOOLCHAIN_ID "140")
     else()
       message(FATAL_ERROR "Unsupported MSVC version number: ${MSVC_VERSION}")
     endif()