Run more tests for GCC backend in the Rust's CI

[nikomatsakis]

Metadata
Point of contact	@GuillaumeGomez
Team(s)	compiler, infra
Goal document	2025h2/gcc-backend-tests

Summary

Over the next six months, we will do the following:

• Run GCC backend's test with GCC backend built sysroot
• Add new ui tests annotations (//@ ignore-backend and //@ needs-backend)
• Run tests with GCC backend:
  • libcore tests
  • UI tests
  • [GCC backend specific tests][extra tests]
• Add documentation in dev guide about how to run tests with the GCC backend

To be noted: this goal is only for linux x86_64 target.

Tasks and status

• Adding new ui annotations (@GuillaumeGomez) Run more tests for rustc_codegen_gcc in the CI compiler-team#891
• Running more GCC backend tests (@GuillaumeGomez) Add a CI job that runs a subset of UI tests with the GCC backend rust#146414

[nikomatsakis]

This issue is intended for status updates only.

For general questions or comments, please contact the owner(s) directly.

[GuillaumeGomez]

This project goal has been completed. I updated the first issue to reflect it. Closing the issue then.