# cmake/toolchain-mingw64.cmake
#
# MinGW-w64 cross-compilation toolchain for Linux → Windows builds.
#
# Usage:
#   cmake -B build-win -G Ninja \
#         -DCMAKE_TOOLCHAIN_FILE=cmake/toolchain-mingw64.cmake \
#         -DCMAKE_BUILD_TYPE=Release
#
# Prerequisites (Ubuntu/Debian):
#   sudo apt install mingw-w64
#
# After building, collect runtime DLLs with scripts/build-windows.sh.

# ── Target system ────────────────────────────────────────────────────────────
set(CMAKE_SYSTEM_NAME    Windows)
set(CMAKE_SYSTEM_VERSION 10)
set(CMAKE_SYSTEM_PROCESSOR x86_64)

# ── Compilers ────────────────────────────────────────────────────────────────
set(CMAKE_C_COMPILER   x86_64-w64-mingw32-gcc)
set(CMAKE_CXX_COMPILER x86_64-w64-mingw32-g++)
set(CMAKE_RC_COMPILER  x86_64-w64-mingw32-windres)

# ── Linker / archiver ────────────────────────────────────────────────────────
set(CMAKE_AR           x86_64-w64-mingw32-ar)
set(CMAKE_RANLIB       x86_64-w64-mingw32-ranlib)
set(CMAKE_STRIP        x86_64-w64-mingw32-strip)

# ── Sysroot search paths ─────────────────────────────────────────────────────
# Allow CMake find_* commands to search the MinGW sysroot.
set(CMAKE_FIND_ROOT_PATH
    /usr/x86_64-w64-mingw32
)

# Headers and libraries from the sysroot only; programmes (host tools) from host.
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)

# ── Static linking ───────────────────────────────────────────────────────────
# Link the MinGW C++ and GCC runtime libraries statically so the produced
# .exe does not depend on MinGW DLLs on the target machine.
set(CMAKE_EXE_LINKER_FLAGS_INIT "-static-libgcc -static-libstdc++")

# ── Executable suffix ─────────────────────────────────────────────────────────
set(CMAKE_EXECUTABLE_SUFFIX ".exe")

# ── vcpkg triplet (optional) ─────────────────────────────────────────────────
# If you are using vcpkg for Windows dependencies, set:
#   -DVCPKG_TARGET_TRIPLET=x64-mingw-static
# and point VCPKG_ROOT to your vcpkg installation.
if(DEFINED ENV{VCPKG_ROOT})
    set(VCPKG_TARGET_TRIPLET "x64-mingw-static" CACHE STRING "vcpkg triplet")
    include("$ENV{VCPKG_ROOT}/scripts/buildsystems/vcpkg.cmake")
endif()