diff --git a/cmake/mingw.cmake b/cmake/mingw.cmake
index c0953430552..3c65483adbf 100644
--- a/cmake/mingw.cmake
+++ b/cmake/mingw.cmake
@@ -34,6 +34,13 @@ if(MINGW)
         _int64=long\ long
     )
     
+    # Clang compatibility: Define _INTEGRAL_MAX_BITS for 64-bit type support
+    # GCC defines _INTEGRAL_MAX_BITS=64 automatically, but Clang does not.
+    # This is needed for GameSpy SDK gsi_i64/gsi_u64 type definitions.
+    if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
+        add_compile_definitions(_INTEGRAL_MAX_BITS=64)
+    endif()
+    
     # Enable math constants in MinGW's <math.h>
     # MinGW provides M_PI, M_E, etc. in <math.h>, but only when -std=c++XX is NOT used (strict ANSI mode),
     # or when _USE_MATH_DEFINES is defined. Since we compile with -std=c++20, we need this define.
diff --git a/cmake/toolchains/clang-mingw-w64-i686.cmake b/cmake/toolchains/clang-mingw-w64-i686.cmake
new file mode 100644
index 00000000000..49a2866a832
--- /dev/null
+++ b/cmake/toolchains/clang-mingw-w64-i686.cmake
@@ -0,0 +1,61 @@
+# Copyright 2026 TheSuperHackers
+# Clang MinGW-w64 32-bit (i686) Toolchain File
+# Use with: cmake -DCMAKE_TOOLCHAIN_FILE=cmake/toolchains/clang-mingw-w64-i686.cmake
+# Requires: clang, lld, and mingw-w64 headers/libraries installed
+
+set(CMAKE_SYSTEM_NAME Windows)
+set(CMAKE_SYSTEM_PROCESSOR i686)
+
+# Find Clang compilers (prefer newer versions)
+find_program(CLANG_C_COMPILER NAMES clang-22 clang-21 clang-20 clang-19 clang-18 clang-17 clang)
+find_program(CLANG_CXX_COMPILER NAMES clang++-22 clang++-21 clang++-20 clang++-19 clang++-18 clang++-17 clang++)
+find_program(LLD_LINKER NAMES lld-22 lld-21 lld-20 lld-19 lld-18 lld-17 lld ld.lld)
+find_program(LLVM_AR NAMES llvm-ar-22 llvm-ar-21 llvm-ar-20 llvm-ar-19 llvm-ar-18 llvm-ar-17 llvm-ar)
+find_program(LLVM_RANLIB NAMES llvm-ranlib-22 llvm-ranlib-21 llvm-ranlib-20 llvm-ranlib-19 llvm-ranlib-18 llvm-ranlib-17 llvm-ranlib)
+
+if(NOT CLANG_C_COMPILER OR NOT CLANG_CXX_COMPILER)
+    message(FATAL_ERROR "Clang not found. Install with: apt-get install clang-19 lld-19")
+endif()
+
+# Specify the cross compiler with MinGW target
+set(CMAKE_C_COMPILER ${CLANG_C_COMPILER})
+set(CMAKE_CXX_COMPILER ${CLANG_CXX_COMPILER})
+set(CMAKE_C_COMPILER_TARGET i686-w64-mingw32)
+set(CMAKE_CXX_COMPILER_TARGET i686-w64-mingw32)
+
+# Use MinGW tools for resource compilation
+set(CMAKE_RC_COMPILER i686-w64-mingw32-windres)
+set(CMAKE_DLLTOOL i686-w64-mingw32-dlltool)
+
+# Use LLVM archiver and ranlib if available, otherwise fall back to MinGW
+if(LLVM_AR)
+    set(CMAKE_AR ${LLVM_AR})
+endif()
+if(LLVM_RANLIB)
+    set(CMAKE_RANLIB ${LLVM_RANLIB})
+endif()
+
+# Use LLD linker for faster linking
+if(LLD_LINKER)
+    set(CMAKE_EXE_LINKER_FLAGS_INIT "-fuse-ld=lld")
+    set(CMAKE_SHARED_LINKER_FLAGS_INIT "-fuse-ld=lld")
+endif()
+
+# Target environment
+set(CMAKE_FIND_ROOT_PATH /usr/i686-w64-mingw32)
+
+# Adjust the default behavior of the FIND_XXX() commands:
+# search programs in the host environment
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+
+# search headers and libraries in the target environment
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+
+# Force 32-bit pointer size
+set(CMAKE_SIZEOF_VOID_P 4)
+
+# Disable MFC-dependent tools (not compatible with MinGW-w64)
+set(RTS_BUILD_CORE_TOOLS OFF CACHE BOOL "Disable MFC-dependent core tools for MinGW" FORCE)
+set(RTS_BUILD_GENERALS_TOOLS OFF CACHE BOOL "Disable MFC-dependent Generals tools for MinGW" FORCE)
+set(RTS_BUILD_ZEROHOUR_TOOLS OFF CACHE BOOL "Disable MFC-dependent Zero Hour tools for MinGW" FORCE)