Fix MinGW build failures. (#4488)

---
TYPE: NO_HISTORY

.github/workflows/build-rtools40.yml

@@ -17,6 +17,21 @@ jobs:
       - uses: actions/checkout@v3
         with:
           fetch-depth: 1
+      - name: Get vcpkg commit to checkout
+        id: vcpkg_commit
+        shell: bash
+        run: |
+          echo "ref=$(grep -oP '(?<=set\(VCPKG_COMMIT_STRING )\w*' cmake/Options/TileDBToolchain.cmake | head -n 1)" >> "$GITHUB_OUTPUT"
+      # We clone vcpkg ourselves because having FetchContent do it inside
+      # the build directory causes compilation errors due to long paths.
+      - name: Checkout vcpkg repository
+        uses: actions/checkout@v3
+        with:
+          repository: microsoft/vcpkg
+          path: vcpkg
+          ref: ${{ steps.vcpkg_commit.outputs.ref }}
+          # Vcpkg requires fetching all commits.
+          fetch-depth: 0
       # Configure required environment variables for vcpkg to use
       # GitHub's Action Cache
       - uses: actions/github-script@v6
@@ -35,6 +50,7 @@ jobs:
           TILEDB_HOME: ${{ github.workspace }}
           MINGW_ARCH: ${{ matrix.msystem }}
           VCPKG_BINARY_SOURCES: 'clear;x-gha,readwrite'
+          VCPKG_ROOT: ${{ github.workspace }}/vcpkg
         shell: c:\rtools40\usr\bin\bash.exe --login {0}
       - name: "Upload binaries"
         uses: actions/upload-artifact@v3

.gitignore

@@ -41,3 +41,6 @@ CMakeUserPresets.json
 docs/.quarto
 # Let CI build this
 /docs
+
+vcpkg
+external/vcpkg

scripts/ci/print_logs.sh

@@ -28,7 +28,7 @@
 set -e pipefail
 # Display log files if the build failed
 echo "Dumping log files for failed build"
-for f in $(find $GITHUB_WORKSPACE/{build,external} -name *.log);
+for f in $(find $GITHUB_WORKSPACE/build -name *.log);
   do
     echo "::group::$f"
     cat $f