feat: add mingw toolchain and preset

Author: Katze719

CMakePresets.json

@@ -39,6 +39,17 @@
                 "value": "x64",
                 "strategy": "external"
             }
+        },
+        {
+            "name": "mingw",
+            "displayName": "MinGW-w64 (cross)",
+            "description": "Cross-compile for Windows using MinGW-w64",
+            "generator": "Ninja",
+            "binaryDir": "${sourceDir}/build/mingw",
+            "toolchainFile": "${sourceDir}/cmake/mingw-toolchain.cmake",
+            "cacheVariables": {
+                "CMAKE_BUILD_TYPE": "Debug"
+            }
         }
     ],
     "buildPresets": [
@@ -77,6 +88,18 @@
             "displayName": "MSVC Release",
             "configurePreset": "msvc",
             "configuration": "Release"
+        },
+        {
+            "name": "mingw-debug",
+            "displayName": "MinGW Debug",
+            "configurePreset": "mingw",
+            "configuration": "Debug"
+        },
+        {
+            "name": "mingw-release",
+            "displayName": "MinGW Release",
+            "configurePreset": "mingw",
+            "configuration": "Release"
         }
     ]
 }

cmake/mingw-toolchain.cmake

@@ -0,0 +1,38 @@
+# MinGW-w64 Toolchain file for cpp-core
+# Usage:
+#   cmake -B build-win -DCMAKE_TOOLCHAIN_FILE=cmake/mingw64-toolchain.cmake ..
+#   cmake --build build-win
+
+# Target system
+set(CMAKE_SYSTEM_NAME Windows)
+set(CMAKE_SYSTEM_PROCESSOR x86_64)
+
+# MinGW-w64 compilers
+set(CMAKE_C_COMPILER x86_64-w64-mingw32-gcc)
+set(CMAKE_CXX_COMPILER x86_64-w64-mingw32-g++)
+
+# Optional, useful for Windows resources
+set(CMAKE_RC_COMPILER x86_64-w64-mingw32-windres)
+
+# Search behavior for cross compiling
+set(CMAKE_FIND_ROOT_PATH /usr/x86_64-w64-mingw32)
+
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+
+# Compiler-specific flags
+set(CMAKE_CXX_FLAGS_INIT "-Wall -Wextra -Wpedantic")
+set(CMAKE_C_FLAGS_INIT "-Wall -Wextra -Wpedantic")
+
+set(CMAKE_CXX_FLAGS_DEBUG_INIT "-g -O0")
+set(CMAKE_C_FLAGS_DEBUG_INIT "-g -O0")
+
+set(CMAKE_CXX_FLAGS_RELEASE_INIT "-O3 -DNDEBUG")
+set(CMAKE_C_FLAGS_RELEASE_INIT "-O3 -DNDEBUG")
+
+# Recommended for Deno-loaded DLLs:
+# statically link MinGW runtime parts, but keep Windows system DLLs dynamic.
+set(CMAKE_SHARED_LINKER_FLAGS_INIT "-static-libgcc -static-libstdc++")
+set(CMAKE_EXE_LINKER_FLAGS_INIT "-static-libgcc -static-libstdc++")