ensure cuda related paths are set correctly on windows

Author: leofang

.github/actions/fetch_ctk/action.yml

@@ -146,8 +146,14 @@ runs:
     - name: Set output environment variables
       shell: bash -xeuo pipefail {0}
       run: |
-        CUDA_PATH=$(realpath "./cuda_toolkit")
+        # mimics actual CTK installation
+        if [[ "${{ inputs.host-platform }}" == linux* ]]; then
+          CUDA_PATH=$(realpath "./cuda_toolkit")
+          echo "LD_LIBRARY_PATH=${LD_LIBRARY_PATH:-}:${CUDA_PATH}/lib:${CUDA_PATH}/nvvm/lib64" >> $GITHUB_ENV
+        elif [[ "${{ inputs.host-platform }}" == win* ]]; then
+          CUDA_PATH=$(cygpath -w $(realpath "./cuda_toolkit"))
+          echo "$(cygpath -w ${CUDA_PATH}/bin)" >> $GITHUB_PATH
+          echo "$(cygpath -w $CUDA_PATH/nvvm/bin)" >> $GITHUB_PATH
+        fi
         echo "CUDA_PATH=${CUDA_PATH}" >> $GITHUB_ENV
         echo "CUDA_HOME=${CUDA_PATH}" >> $GITHUB_ENV
-        echo "${CUDA_PATH}/bin" >> $GITHUB_PATH
-        echo "LD_LIBRARY_PATH=${LD_LIBRARY_PATH:-}:${CUDA_PATH}/lib:${CUDA_PATH}/nvvm/lib64" >> $GITHUB_ENV

.github/workflows/build-and-test.yml

@@ -146,7 +146,7 @@ jobs:
             LIBRARY_PATH=/host/${{ env.CUDA_PATH }}/lib
             CUDA_BINDINGS_PARALLEL_LEVEL=${{ env.CUDA_BINDINGS_PARALLEL_LEVEL }}
           CIBW_ENVIRONMENT_WINDOWS: >
-            CUDA_HOME="$(cygpath -w ${{ env.CUDA_PATH }})"
+            CUDA_HOME=${{ env.CUDA_PATH }}
             LIB="${CUDA_HOME}\\lib\\x64;${LIB}"
             CUDA_BINDINGS_PARALLEL_LEVEL=${{ env.CUDA_BINDINGS_PARALLEL_LEVEL }}
         with:

.github/workflows/test-wheel-windows.yml

@@ -100,6 +100,7 @@ jobs:
 
       - name: Install Git for Windows
         # the GPU runner image does not have Git Bash pre-installed...
+        if: ${{ inputs.local-ctk == '1' }}
         env:
           # doesn't seem there's an easy way to avoid hard-coding it?
           GFW_EXE_URL: https://github.com/git-for-windows/git/releases/download/v2.49.0.windows.1/PortableGit-2.49.0-64-bit.7z.exe
@@ -172,13 +173,6 @@ jobs:
           host-platform: ${{ inputs.host-platform }}
           cuda-version: ${{ inputs.cuda-version }}
 
-      - name: Update PATH
-        if: ${{ inputs.local-ctk == '1' }}
-        run: |
-          # mimics actual CTK installation
-          echo $PATH
-          echo "$env:CUDA_PATH\nvvm\bin" >> $env:GITHUB_PATH
-
       - name: Run cuda.bindings tests
         if: ${{ env.SKIP_CUDA_BINDINGS_TEST == '0' }}
         run: |