ci(windows): replace S3 MSYS2 zip with cached pacman install of clang 18.1.8

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

@@ -138,23 +138,37 @@ jobs:
         with:
           dotnet-version: '8.0.x'
 
-      - name: Install MSYS2 for MRBind
+      - name: Cache pinned MSYS2 packages
+        # Cache key tracks the lockfile; `wget -nc` makes cache-hit a no-op,
+        # and `sha256sum -c` in the install script is the integrity gate.
         if: ${{inputs.mrbind || (inputs.mrbind_c && matrix.build_system == 'CMake') || env.BUILD_C_SHARP == 'true'}}
-        uses: ./.github/actions/install-msys2-mrbind
+        uses: actions/cache@v5
+        with:
+          path: scripts/mrbind/msys2_packages
+          key: msys2-mrbind-clang18-${{ hashFiles('scripts/mrbind/msys2_package_hashes_clang18.txt') }}
 
-      - name: Install gettext utilities
-        if: ${{ inputs.upload_artifacts }}
+      - name: Install MSYS2 for MRBind
+        # Pin clang to 18.1.8 — same version master's S3 zip ships.
+        # Pinning only clang/llvm causes `STATUS_DLL_NOT_FOUND` from
+        # cc.exe, so the lockfile carries the whole clang-18-era
+        # runtime stack.
+        if: ${{inputs.mrbind || (inputs.mrbind_c && matrix.build_system == 'CMake') || env.BUILD_C_SHARP == 'true'}}
+        shell: pwsh
         run: |
-          C:\msys64_meshlib_mrbind\msys2_shell.cmd -clang64 -defterm -no-start -c "pacman -S --noconfirm --needed mingw-w64-clang-x86_64-gettext-tools"
+          C:\msys64\msys2_shell.cmd -no-start -defterm -here -c "set -e && bash scripts/mrbind/msys2_download_packages.sh _clang18 && bash scripts/mrbind/msys2_install_packages.sh _clang18"
 
       - name: Build MRBind
         if: ${{inputs.mrbind || (inputs.mrbind_c && matrix.build_system == 'CMake') || env.BUILD_C_SHARP == 'true'}}
         shell: cmd
+        env:
+          MSYS2_DIR: C:\msys64
         run: call ./scripts/mrbind/install_mrbind_windows_msys2.bat
 
       - name: Generate C bindings
         if: ${{ (inputs.mrbind_c && matrix.build_system == 'CMake') || env.BUILD_C_SHARP == 'true' }}
         shell: cmd
+        env:
+          MSYS2_DIR: C:\msys64
         # Note that `\` doesn't work here as a line continuation, and will lead to weird errors.
         run: |
           call "${{matrix.vc-path}}\Common7\Tools\VsDevCmd.bat" -arch=amd64 ${{ fromJSON('["", "-vcvars_ver=14.2"]')[matrix.cxx_compiler == 'msvc-2019'] }}
@@ -164,6 +178,8 @@ jobs:
       - name: Generate C# bindings
         if: ${{ env.BUILD_C_SHARP == 'true' }}
         shell: cmd
+        env:
+          MSYS2_DIR: C:\msys64
         # Note that `\` doesn't work here as a line continuation, and will lead to weird errors.
         run: |
           call "${{matrix.vc-path}}\Common7\Tools\VsDevCmd.bat" -arch=amd64 ${{ fromJSON('["", "-vcvars_ver=14.2"]')[matrix.cxx_compiler == 'msvc-2019'] }}
@@ -173,7 +189,7 @@ jobs:
       - name: Build
         shell: cmd
         env:
-          GETTEXT_ROOT: C:\msys64_meshlib_mrbind\clang64
+          GETTEXT_ROOT: C:\msys64\clang64
           VCPKG_ROOT: C:\vcpkg
           VCPKG_TARGET_TRIPLET: ${{ matrix.vcpkg_triplet }}
         # `|| exit /b 1` is used instead of `if errorlevel 1 exit 1`
@@ -194,6 +210,8 @@ jobs:
       - name: Generate and build Python bindings
         if: ${{inputs.mrbind && matrix.vcpkg_triplet != 'x64-windows-meshlib-iterator-debug'}}
         shell: cmd
+        env:
+          MSYS2_DIR: C:\msys64
         # Note that `\` doesn't work here as a line continuation, and will lead to weird errors.
         run: |
           call "${{matrix.vc-path}}\Common7\Tools\VsDevCmd.bat" -arch=amd64 ${{ fromJSON('["", "-vcvars_ver=14.2"]')[matrix.cxx_compiler == 'msvc-2019'] }}

.github/workflows/pip-build.yml

@@ -308,14 +308,21 @@ jobs:
         run: msbuild -m  source\MeshLib.sln -p:Configuration=Release
 
       - name: Install MSYS2 for MRBind
-        uses: ./.github/actions/install-msys2-mrbind
+        # See build-test-windows.yml's matching step for rationale.
+        shell: pwsh
+        run: |
+          C:\msys64\msys2_shell.cmd -no-start -defterm -here -c "set -e && bash scripts/mrbind/msys2_download_packages.sh _clang18 && bash scripts/mrbind/msys2_install_packages.sh _clang18"
 
       - name: Build MRBind
         shell: cmd
+        env:
+          MSYS2_DIR: C:\msys64
         run: call ./scripts/mrbind/install_mrbind_windows_msys2.bat
 
       - name: Generate and build MRBind bindings
         shell: cmd
+        env:
+          MSYS2_DIR: C:\msys64
         run: |
           call "C:\Program Files\Microsoft Visual Studio\2022\Enterprise\Common7\Tools\VsDevCmd.bat" -arch=amd64
           call ./scripts/mrbind/generate_win.bat -B --trace FOR_WHEEL=1

scripts/mrbind/msys2_package_hashes_clang18.txt

@@ -0,0 +1,49 @@
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+95babf857eaa0853f1099201b95aa3ea7e1f3c64b29afb75e447f630a7701fd9 *msys2_packages/mingw-w64-clang-x86_64-bzip2-1.0.8-3-any.pkg.tar.zst
+bd0f6a55869eadea478c8d6a5493a52a9a24a9e4d59bad9ca0e3378d4f1af6d6 *msys2_packages/mingw-w64-clang-x86_64-c-ares-1.34.3-1-any.pkg.tar.zst
+4f627c2f792fc392c14d4aba3995779480dc487bbc4465cc6ff1113035ecb6e0 *msys2_packages/mingw-w64-clang-x86_64-ca-certificates-20240203-1-any.pkg.tar.zst
+b989a8d9ee08725be932468cd2207ebdfc0687c34e3f3536c97f31cfead3e6a2 *msys2_packages/mingw-w64-clang-x86_64-clang-18.1.8-2-any.pkg.tar.zst
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