chore: update gRPC version and compatibility notes
- Upgraded gRPC from v1.67.1 to v1.75.1 for improved Windows compatibility. - Disabled BoringSSL ASM optimizations for better clang-cl support. - Updated documentation to reflect changes in build times and reasons for using FetchContent over vcpkg for gRPC.
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scawful
@@ -164,61 +164,69 @@ open build/yaze.xcodeproj
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## 7. Windows Build Optimization
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### gRPC v1.67.1 and MSVC Compatibility
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### GitHub Actions / CI Builds
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**Recent Update (October 2025):** The project has been upgraded to gRPC v1.67.1 which includes critical MSVC template fixes. This version resolves previous template instantiation errors that occurred with v1.62.0.
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**Current Configuration (Optimized):**
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- **Compilers**: Both clang-cl and MSVC supported (matrix)
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- **vcpkg**: Only fast packages (SDL2, yaml-cpp) - 2 minutes
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- **gRPC**: Built via FetchContent (v1.67.1) - cached after first build
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- **Caching**: Aggressive multi-tier caching (vcpkg + FetchContent + sccache)
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- **Expected time**:
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- First build: ~10-15 minutes
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- Cached build: ~3-5 minutes
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**MSVC-Specific Compiler Flags:**
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The build system now automatically applies these flags for Windows builds:
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- `/bigobj` - Allows large object files (gRPC generates many symbols)
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- `/permissive-` - Enables standards conformance mode
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- `/wd4267 /wd4244` - Suppresses harmless conversion warnings
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- `/constexpr:depth2048` - Handles deep template instantiations (MSVC 2019+)
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**Why Not vcpkg for gRPC?**
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- vcpkg's latest gRPC (v1.71.0) has no pre-built binaries
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- Building from source via vcpkg: 45-90 minutes
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- FetchContent with caching: 10-15 minutes first time, <1 min cached
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- Better control over gRPC version (v1.75.1 with Windows fixes)
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- BoringSSL ASM disabled on Windows for clang-cl compatibility
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- zlib conflict: gRPC's FetchContent builds its own zlib, conflicts with vcpkg's
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### The Problem: Slow gRPC Builds
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Building with gRPC on Windows (`-DYAZE_WITH_GRPC=ON`) can take **15-20 minutes** the first time, as it compiles gRPC v1.67.1 and its dependencies from source.
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### Local Development
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### Solution A: Use vcpkg for Pre-compiled Binaries (Recommended - FAST)
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#### Fast Build (Recommended)
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Using `vcpkg` to manage gRPC is the recommended approach for Windows developers who need GUI automation features.
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**Step 1: Install vcpkg and Dependencies**
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Use FetchContent for all dependencies (matches CI):
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```powershell
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# This only needs to be done once
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# Use the setup script for convenience:
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.\scripts\setup-vcpkg-windows.ps1
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# Or manually:
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vcpkg install grpc:x64-windows protobuf:x64-windows abseil:x64-windows
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```
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**Step 2: Configure CMake to Use vcpkg**
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Pass the `vcpkg.cmake` toolchain file to your configure command.
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```powershell
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# Configure a build that uses vcpkg for gRPC
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cmake -B build -G "Visual Studio 17 2022" -A x64 `
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-DCMAKE_TOOLCHAIN_FILE="vcpkg/scripts/buildsystems/vcpkg.cmake"
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# Build (will now be much faster: 5-10 minutes)
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cmake --build build --config RelWithDebInfo --parallel
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```
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**Build Time:** ~5-10 minutes (uses pre-compiled gRPC)
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### Solution B: FetchContent Build (Slow but Automatic)
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If you don't want to use vcpkg, CMake will automatically download and build gRPC from source.
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```powershell
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# Configure (will download and build gRPC v1.67.1 from source)
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# Configure (first time: ~15 min, subsequent: ~2 min)
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cmake -B build -G "Visual Studio 17 2022" -A x64
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# Build (first time: ~45-60 minutes, subsequent: ~2-5 minutes)
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# Build
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cmake --build build --config RelWithDebInfo --parallel
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```
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**Build Time:** ~45-60 minutes first time, ~2-5 minutes subsequent builds (gRPC cached)
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#### Using vcpkg (Optional)
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If you prefer vcpkg for local development:
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```powershell
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# Install ONLY the fast packages
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vcpkg install sdl2:x64-windows yaml-cpp:x64-windows
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# Let CMake use FetchContent for gRPC
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cmake -B build -DCMAKE_TOOLCHAIN_FILE=vcpkg/scripts/buildsystems/vcpkg.cmake
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```
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**DO NOT** install grpc or zlib via vcpkg:
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- gRPC v1.71.0 has no pre-built binaries (45-90 min build)
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- zlib conflicts with gRPC's bundled zlib
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### Compiler Support
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**clang-cl (Recommended):**
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- Used in both CI and release workflows
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- Better diagnostics than MSVC
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- Fully compatible with MSVC libraries
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**MSVC:**
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- Also tested in CI matrix
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- Fallback option if clang-cl issues occur
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**Compiler Flags (Applied Automatically):**
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- `/bigobj` - Large object files (required for gRPC)
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- `/permissive-` - Standards conformance
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- `/wd4267 /wd4244` - Suppress harmless conversion warnings
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- `/constexpr:depth2048` - Template instantiation depth
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## 8. Troubleshooting
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