# Cross-building Frame Studio for Windows from Linux with llvm-mingw (https://github.com/mstorsjo/llvm-mingw):
#   cmake -S studio -B build/windows-arm64 -DCMAKE_TOOLCHAIN_FILE=cmake/llvm-mingw.cmake -DWINDOWS_ARCH=aarch64 \
#         -DLLVM_MINGW=/path/to/llvm-mingw
# WINDOWS_ARCH: x86_64 (64-bit PCs), i686 (32-bit), aarch64 (Windows on ARM). LLVM_MINGW defaults to $LLVM_MINGW,
# then ~/.local/opt/llvm-mingw.
set(CMAKE_SYSTEM_NAME Windows)
if(NOT WINDOWS_ARCH)
    set(WINDOWS_ARCH x86_64)
endif()
set(WINDOWS_ARCH "${WINDOWS_ARCH}" CACHE STRING "x86_64, i686 or aarch64")
if(WINDOWS_ARCH STREQUAL "aarch64")
    set(CMAKE_SYSTEM_PROCESSOR ARM64)
elseif(WINDOWS_ARCH STREQUAL "i686")
    set(CMAKE_SYSTEM_PROCESSOR X86)
else()
    set(CMAKE_SYSTEM_PROCESSOR AMD64)
endif()
if(NOT LLVM_MINGW)
    if(DEFINED ENV{LLVM_MINGW})
        set(LLVM_MINGW "$ENV{LLVM_MINGW}")
    else()
        set(LLVM_MINGW "$ENV{HOME}/.local/opt/llvm-mingw")
    endif()
endif()
set(LLVM_MINGW "${LLVM_MINGW}" CACHE PATH "llvm-mingw's folder")
set(CMAKE_C_COMPILER "${LLVM_MINGW}/bin/${WINDOWS_ARCH}-w64-mingw32-clang")
set(CMAKE_CXX_COMPILER "${LLVM_MINGW}/bin/${WINDOWS_ARCH}-w64-mingw32-clang++")
set(CMAKE_RC_COMPILER "${LLVM_MINGW}/bin/${WINDOWS_ARCH}-w64-mingw32-windres")
set(CMAKE_FIND_ROOT_PATH "${LLVM_MINGW}/${WINDOWS_ARCH}-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)