fix: Windows build configuration with Ninja and Clang

- Add Ninja build system installation for Windows runners
- Configure CMake to use Ninja generator with Clang from LLVM
- Improve LLVM detection with detailed diagnostic messages
- Add explicit LLVM library directory linking for Windows

This fixes the CMake configuration errors on Windows CI builds.

Author: ProgrammerKR

.github/workflows/build.yml

@@ -77,6 +77,10 @@ jobs:
             exit 1
           }
 
+      - name: Install Ninja (Windows)
+        if: matrix.os == 'windows-latest'
+        run: choco install ninja -y
+
       - name: Configure (Unix)
         if: matrix.os != 'windows-latest'
         shell: bash
@@ -91,9 +95,12 @@ jobs:
         shell: pwsh
         run: |
           cmake -S . -B build `
+             -G "Ninja" `
              -DCMAKE_BUILD_TYPE=${{ env.BUILD_TYPE }} `
              -DBUILD_TESTS=OFF `
              -DBUILD_BENCH=OFF `
+             -DCMAKE_C_COMPILER="$env:LLVM_ROOT/bin/clang.exe" `
+             -DCMAKE_CXX_COMPILER="$env:LLVM_ROOT/bin/clang++.exe" `
              -DLLVM_DIR="$env:LLVM_DIR" `
              -DCMAKE_PREFIX_PATH="$env:LLVM_ROOT"
 

CMakeLists.txt

@@ -20,6 +20,15 @@ set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake/modules")
 # --- LLVM Configuration ---
 find_package(LLVM CONFIG REQUIRED)
 
+if(NOT LLVM_FOUND)
+    message(FATAL_ERROR "LLVM not found! Please install LLVM and set LLVM_DIR.")
+endif()
+
+message(STATUS "Found LLVM ${LLVM_PACKAGE_VERSION}")
+message(STATUS "LLVM Include Dirs: ${LLVM_INCLUDE_DIRS}")
+message(STATUS "LLVM Library Dirs: ${LLVM_LIBRARY_DIRS}")
+message(STATUS "LLVM Definitions: ${LLVM_DEFINITIONS}")
+
 # --- LibFFI Configuration ---
 # specialized find_package might be needed if not in standard path, but let's try standard first
 find_package(PkgConfig QUIET)
@@ -44,11 +53,17 @@ else()
     message(WARNING "LibFFI not found. FFI features will be disabled.")
 endif()
 
-message(STATUS "Found LLVM ${LLVM_PACKAGE_VERSION}")
 include_directories(SYSTEM ${LLVM_INCLUDE_DIRS})
 add_definitions(${LLVM_DEFINITIONS})
+
+# Explicitly add LLVM library directories
 link_directories(${LLVM_LIBRARY_DIRS})
 
+if(WIN32)
+    # Additional linking configuration for Windows
+    link_directories(${LLVM_LIBRARY_DIRS})
+endif()
+
 # Map generic components to specific libs
 llvm_map_components_to_libnames(llvm_libs core support executionengine native ipo analysis transformutils bitwriter)