Windows Cross Build using Clang

Supported host Platforms:

• Windows
• Linux
• macOS
• Any platforms can run clang

Requirements:

• llvm tools: clang, lld, llvm-nm, llvm-ar etc.
• vcrt and windows sdk
• lower case symbolic links on case sensitive filesystems: run ./winsdk/lowercase.sh

Environment Variables:

• ONECORE: "onecore" or empty/unset
• USE_TOOLCHAIN: clang path, or simply clang(on macOS, it's xcode'c clang)

Command: USE_TOOLCHAIN=clang-10 ./avbuild.sh win "arch1 arch2 ...", arch1/arch2 can be x86, x64 etc. If arch is not set, i.e. USE_TOOLCHAIN=clang-10 ./avbuild.sh win, then x86 and x64 will be built at the same time.

USE_TOOLCHAIN=clang-10 ./avbuild.sh uwp|winrt|winstore: build for uwp

Miscs:

• binutils: dumpbin=>llvm-nm, lib=>llvm-ar, windres=>https://github.com/nico/hack/tree/master/res(used in chromium for all platforms) or llvm-rc? https://github.com/mstorsjo/llvm-mingw/blob/master/Dockerfile

TODO:

• win[version][store]: min target windows version, e.g. win5.1 for xp, win6.0 for vista, win10store for uwp