Setup

Step 1. install lld

brew install lld

or for linux, sudo apt-get install lld

Step 1. get xwin

cargo install xwin

Step 2. download windows sdks

we shall use ~/.xwin.

xwin --accept-license splat --use-winsysroot-style --preserve-ms-arch-notation --include-debug-libs --include-debug-symbols --output ~/.xwin

Step 3. get geode binaries

geode sdk install-binaries -p win

Step 4. create toolchain file

save this file as a .cmake file (e.g ~/.local/windows.cmake):

set(CMAKE_SYSTEM_NAME Windows)
set(CMAKE_SYSTEM_VERSION 10.0)
set(CMAKE_SYSTEM_PROCESSOR AMD64)

set(CMAKE_C_COMPILER clang-cl)
set(CMAKE_CXX_COMPILER clang-cl)

set(CMAKE_CXX_FLAGS_INIT "--target=x86_64-pc-windows-msvc /winsysroot $ENV{HOME}/.xwin -fuse-ld=lld")
set(CMAKE_EXE_LINKER_FLAGS_INIT "/manifest:no /winsysroot:$ENV{HOME}/.xwin")
set(CMAKE_SHARED_LINKER_FLAGS_INIT ${CMAKE_EXE_LINKER_FLAGS_INIT})
set(CMAKE_MODULE_LINKER_FLAGS_INIT ${CMAKE_EXE_LINKER_FLAGS_INIT})

set(CMAKE_C_FLAGS_INIT ${CMAKE_CXX_FLAGS_INIT})

set(CMAKE_C_STANDARD_LIBRARIES "")
set(CMAKE_CXX_STANDARD_LIBRARIES "")

set(CMAKE_INSTALL_SYSTEM_RUNTIME_LIBS_NO_WARNINGS ON)

Use

use -DCMAKE_TOOLCHAIN_FILE=<toolchain file> when making your build folder. then build normally. e.g:

cmake -B build-win -DCMAKE_TOOLCHAIN_FILE=~/.local/windows.cmake
cmake --build build-win