added support for `arm64` and `x64_arm64` in `otp_build`

[cocoa-xu]

This PR is one of the smaller PRs separated from the original PR https://github.com/erlang/otp/pull/8142 that attempts to add initial support for ARM64 windows.

I'm open to change x64_arm64 to any alternative value(s) that can tell us we're cross-compiling. I'm also open to add amd64_arm64 as an alias for x64_arm64 if we'd like to make it consistent with Microsoft Visual Studio, please see vcvarsall.

In this PR,

• echo_env_wsl now accepts a single argument ARCH, which can be one of x64, arm64, x64_arm64 and x86
• wsl_tools/vc/cc.sh will set LINKCMD="-MACHINE:${MACHINE}" by default, where the value for MACHINE is:
  • x64 when CONFIG_SUBTYPE is win64
  • ARM64 when CONFIG_SUBTYPE is either arm64 or x64_arm64
  • x86 for all other CONFIG_SUBTYPE values
• wsl_tools/vc/cc.sh will add -D__aarch64__ to COMMON_CFLAGS when (cross-)compiling for the arm64 target
• wsl_tools/reg_query.sh will set REG_OPT=" /reg:64" when CONFIG_SUBTYPE is either arm64 or x64_arm64

When compile on an arm64 machine natively

• CONFIG_SUBTYPE will be set to arm64

• build_type, host_type and target_type are all set to local-aarch64-pc-windows

• win64-arm64.config.cache.static will be used.

  It uses win64.config.cache.static as the template and all local-x86_64-pc-windows are replaced by local-aarch64-pc-windows

When cross-compiling on an x86_64 host machine

• CONFIG_SUBTYPE will be set to x64_arm64

• build_type will be set to local-x86_64-pc-windows while host_type and target_type are all set to local-aarch64-pc-windows

• win64-x64_arm64.config.cache.static will be used.

  It uses win64.config.cache.static as the template and local-x86_64-pc-windows are replaced by local-aarch64-pc-windows except for ac_cv_build and ac_cv_env_build_alias_value

[github-actions[bot]]

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[cocoa-xu]

Was going update wsl_tools/vc/emu_cc.sh in the next PR with documentation regarding where to get/download the compiler, but I think we should be fine to add it in this PR because its name, aarch64-w64-mingw32-gcc, should follow the same convention regardless of which implementation we're using.

[bjorng]

Thanks for your pull request.

It seems that it would be better to squash the commits into one. While you are it, you could follow the advice in writing good commit messages and change the commit message to add support for arm64 and x64_arm64 in otp_build.

[cocoa-xu]

Thanks for your pull request.

It seems that it would be better to squash the commits into one. While you are it, you could follow the advice in writing good commit messages and change the commit message to add support for arm64 and x64_arm64 in otp_build.

Hi @bjorng, thank you so much for the review, and I'll be happy to do so!

[bjorng]

Thanks! Added to our daily builds. I expect to merge this pull request within a few days unless any problems show up.

[cocoa-xu]

Thanks @bjorng! And I think we're probably 2 more small PRs away from being able to compile an experimental version for ARM64 Windows.

[bjorng]

Thanks for your pull request.