Add support for the riscv64-linux-android target

[chriswailes]

Proposal

The Android team would like to add support for the riscv64-linux-android target. We've been building and testing a local version of this patch for several releases and are ready to upstream these changes to support experimental development for the target.

Mentors or Reviewers

chriswailes

Process

The main points of the Major Change Process are as follows:

• File an issue describing the proposal.
• A compiler team member or contributor who is knowledgeable in the area can second by writing @rustbot second.
  • Finding a "second" suffices for internal changes. If however, you are proposing a new public-facing feature, such as a -C flag, then full team check-off is required.
  • Compiler team members can initiate a check-off via @rfcbot fcp merge on either the MCP or the PR.
• Once an MCP is seconded, the Final Comment Period begins. If no objections are raised after 10 days, the MCP is considered approved.

You can read more about Major Change Proposals on forge.

Comments

This issue is not meant to be used for technical discussion. There is a Zulip stream for that. Use this issue to leave procedural comments, such as volunteering to review, indicating that you second the proposal (or third, etc), or raising a concern that you would like to be addressed.

[rustbot]

This issue is not meant to be used for technical discussion. There is a Zulip stream for that. Use this issue to leave procedural comments, such as volunteering to review, indicating that you second the proposal (or third, etc), or raising a concern that you would like to be addressed.

cc @rust-lang/compiler @rust-lang/compiler-contributors

[oli-obk]

@rustbot second

[Amanieu]

My understanding is that Android will end up requiring a larger set of features than the base GC RISC-V profile. Does this target intend to track the upstream target requirements, in which case this should be considered more of a "beta" target until the exact feature requirements for Android are nailed down?

[chriswailes]

You are correct on all accounts. Is "beta" an alternative to "Tier 3"?

[the8472]

Wasi is switching to a -preview<number> suffix. See #607

[riking]

"Target is beta" is something you would describe in the target support document.

[wesleywiser]

@rustbot label -final-comment-period +major-change-accepted