Attempt at reverse interop (Swift -> Cxx ) in zephyr

Build Steps (Linux)

Install swiftly and main snapshot:

swiftly use --install main-snapshot-2025-04-02

x86_64 QEMU command line tried:

cmake -DZEPHYR_TOOLCHAIN_VARIANT=llvm -DLLVM_TOOLCHAIN_PATH=$HOME/.local -DCMAKE_Swift_COMPILER_TARGET=x86_64-unknown-none-elf -DBOARD=qemu_x86_64 -Bbuild -GNinja

aarch64 QEMU command line tried:

cmake -DZEPHYR_TOOLCHAIN_VARIANT=llvm -DLLVM_TOOLCHAIN_PATH=$HOME/.local -DCMAKE_Swift_COMPILER_TARGET=aarch64-none-none-elf -DBOARD=qemu_cortex_a53 -Bbuild -GNinja