implements RFC 463; produce gcc compatible dep files

[ringabout]

closes https://github.com/nim-lang/RFCs/issues/463

todo

• [ ] tests
• [ ] changelog
• [ ] better error messages
• [ ] make logic robust
• [ ] allow specifying the nim executable
• [ ] allow specifying nimcache

[CyberTailor]

Could you rebase commits for cleaner logs?

[CyberTailor]

So nimgendeps is a wrapper around nim c? Very clever!

[CyberTailor]

Also I'd:

1. pass all unknown options to Nim
2. add "--nim" option to set Nim executable
3. respect "--nimcache" option
4. add help output

[CyberTailor]

Depfile should be written not for "src" but for out binary.

[ringabout]

1. pass all unknown options to Nim
2. add "--nim" option to set Nim executable
3. respect "--nimcache" option
4. add help output
5. Depfile should be written not for "src" but for out binary.

@CyberTailor Thanks for your suggestions. The points above are solved.

[Varriount]

@ringabout Please see comments

[github-actions[bot]]

This pull request is stale because it has been open for 1 year with no activity. Contribute more commits on the pull request and rebase it on the latest devel, or it will be closed in 30 days. Thank you for your contributions.

[github-actions[bot]]

This pull request has been marked as stale and closed due to inactivity after 395 days.