windows: make zsyscall_windows.go generatable on non-WSL env

mkerrors.bash requires a Windows host, as it hard-codes paths like
/mnt/c/Program Files (x86)/Windows Kits.
But this does not allow to generate in non-WSL env.

Currently mkerrors.bash runs earlier than mksyscall_windows.go
when we run `go generate` and it fails on non-WSL env.
So zsyscall_windows.go is not generated in that case.

To fix that, I reoreder of code generation in this CL so that we can
generate zsyscall_windows.go in non-WSL env.

Also update error message in mkerrors.bash.

Change-Id: I04eccdbfe1e1ff56f8c405250f0724000d66d579
Reviewed-on: https://go-review.googlesource.com/c/sys/+/178781
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
4 files changed
tree: 526896524690be504a936ff2d98373c681b197ea
  1. cpu/
  2. plan9/
  3. unix/
  4. windows/
  5. .gitattributes
  6. .gitignore
  7. AUTHORS
  8. codereview.cfg
  9. CONTRIBUTING.md
  10. CONTRIBUTORS
  11. go.mod
  12. LICENSE
  13. PATENTS
  14. README.md
README.md

sys

This repository holds supplemental Go packages for low-level interactions with the operating system.

Download/Install

The easiest way to install is to run go get -u golang.org/x/sys. You can also manually git clone the repository to $GOPATH/src/golang.org/x/sys.

Report Issues / Send Patches

This repository uses Gerrit for code changes. To learn how to submit changes to this repository, see https://golang.org/doc/contribute.html.

The main issue tracker for the sys repository is located at https://github.com/golang/go/issues. Prefix your issue with “x/sys:” in the subject line, so it is easy to find.