gitignore: Adding windows build directory

Some of the code is still linux only

.gitignore

@@ -5,3 +5,4 @@ _deps
 CMakeSettings.json
 .vs
 .cache
+build-win-x86_64

CMakeLists.txt

@@ -91,3 +91,25 @@ add_executable(${NAME} ${SRC_CXX_FILES})
 
 # Link raylib and raylib-cpp
 target_link_libraries(${NAME} PUBLIC raylib nlohmann_json::nlohmann_json)
+
+# Windows cross-compilation rule
+
+if (NOT DEFINED CMAKE_CROSSCOMPILE_WINDOWS_HELPER_ADDED)
+    set(CMAKE_CROSSCOMPILE_WINDOWS_HELPER_ADDED TRUE)
+
+    set(WIN_TOOLCHAIN_FILE "${CMAKE_SOURCE_DIR}/toolchain-mingw-w64-x86_64.cmake" CACHE PATH "Toolchain for Win x86_64")
+
+    add_custom_target(cmake-win
+        COMMAND ${CMAKE_COMMAND} -E echo "Configuring Windows x86_64 build in: ${CMAKE_SOURCE_DIR}/build-win-x86_64"
+        COMMAND ${CMAKE_COMMAND}
+            -S ${CMAKE_SOURCE_DIR}
+            -B ${CMAKE_SOURCE_DIR}/build-win-x86_64
+            -G "Ninja"
+            -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
+            -DCMAKE_TOOLCHAIN_FILE=${WIN_TOOLCHAIN_FILE}
+        COMMAND ${CMAKE_COMMAND} --build ${CMAKE_SOURCE_DIR}/build-win-x86_64 -- -v
+        WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+        COMMENT "Configure & build for Windows x86_64 (MinGW-w64)"
+        VERBATIM
+    )
+endif()

toolchain-mingw-w64-x86_64.cmake

@@ -0,0 +1,21 @@
+set(CMAKE_SYSTEM_NAME Windows)
+set(CMAKE_SYSTEM_VERSION 1)
+set(CMAKE_CROSSCOMPILING TRUE)
+
+set(MINGW_TRIPLET "x86_64-w64-mingw32")
+
+set(CMAKE_C_COMPILER   ${MINGW_TRIPLET}-gcc)
+set(CMAKE_CXX_COMPILER ${MINGW_TRIPLET}-g++)
+set(CMAKE_RC_COMPILER  ${MINGW_TRIPLET}-windres)
+set(CMAKE_AR           ${MINGW_TRIPLET}-ar)
+set(CMAKE_RANLIB       ${MINGW_TRIPLET}-ranlib)
+set(CMAKE_OBJCOPY      ${MINGW_TRIPLET}-objcopy)
+
+set(CMAKE_FIND_ROOT_PATH /usr/${MINGW_TRIPLET})
+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_C_FLAGS_INIT "-static -static-libgcc -static-libstdc++")
+set(CMAKE_CXX_FLAGS_INIT "-static -static-libgcc -static-libstdc++")
+