Architecture and OS targeting improvements for .NET 6

[marcpopMSFT]

https://github.com/dotnet/designs/blob/d248ad68b41866eba17e80225a08518b8202ddf6/accepted/2021/architecture-targeting.md#net-6

For the shorthand RID, the proposal is to go with --arch and -a and --os (no need for a short form of os).

.NET 6

The following changes should be included in .NET 6, motivated by the x64 emulation scenario. They are all additive and non-breaking.

• Enable shorthand RID syntax. Add to the following verbs (priority order): -- Adding OS and arch command line options #18889
  • build
  • publish
  • tool install
  • test
  • run
  • watch run
  • watch test
• Enable shorthand RID syntax for tool install (separate PR from other verbs)-- Adding arch option to tool install command #19370
• Do NOT enable the -r RID syntax on these same verbs. Doing so would cause a breaking change in .NET 7, which seems like a unforgivable mistake.-- No-op
• Enable implicit RID where there is one known choice:
  • The macOS Arm64 SDK should treat pre .NET 6 versions as X64 by default.-- Fixed by Add property for opting out of apphost signing in macOS #18216
  • The Windows Arm64 SDK should treat pre .NET 5 versions as X64 by default.-- Set pre-net5 win-arm64 to x64 by default #19052
• Parity syntax between dotnet build and dotnet publish for pivoting between self-contained and framework-dependent modalities, for example:-- Update self contained/ runtime command line options for build and publish #18837
  • dotnet build -r win-x64 --self-contained
  • dotnet build -r win-x64 --self-contained true
  • dotnet build -r win-x64 --self-contained false
  • dotnet build -r win-x64 --no-self-contained
• Add warning when using -r without a --self-contained or --no-self-contained. The warning is for .NET 6+ apps only.-- Update self contained/ runtime command line options for build and publish #18837
• Add a warning when using -r with either --os or --arch-- Adding OS and arch command line options #18889

The addition of the shorthand RID syntax and the parity syntax between build and publish will provide a satisfactory set of gestures to enable migration with .NET 6 to a non-breaking syntax with respect to .NET 7. In particular, users need to migrate any uses of -r to always be accompanied by one of the --self-contained or --no-self-contained switches.

[dotnet-issue-labeler]

I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.

[sfoslund]

Do NOT enable the -r RID syntax on these same verbs. Doing so would cause a breaking change in .NET 7, which seems like a unforgivable mistake.

@richlander can you clarify here? Most of those verbs already have the -r rid syntax, so you want to remove that? Or just avoid adding it to new commands?

[sfoslund]

All tasks finished and merged, closing this issue...

[richlander]

Thanks! How can I test the latest behavior? Try a nightly build?

[sfoslund]

Yup, pick up a nightly build in a few hours, once it's flowed: https://github.com/dotnet/installer#installers-and-binaries