Improve `Session`/`CodegenBackend` construction - #161432

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nnethercote wants to merge 7 commits into

rust-lang:mainfrom

nnethercote:improve-session-backend-building

Commits on Aug 31, 2026

[161903] Slightly extend `tests/run-make/target-specs/rmake.rs`
nnethercote
committed
f1a579a
[161903] Adjust when "This is the default target CPU..." message is printed
nnethercote
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a35d96d
[161903] Explicitly set the `cpu` field for `avr-none`
nnethercote
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1b3ee67
[161903] Fix initialization cycle in `target_config`
nnethercote
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96079cd
Split `build_session`
nnethercote
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ef564eb
Change `CodegenBackend::init` to take `&mut self`
nnethercote
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e6a3eac
Remove `global_backend_features` query
nnethercote
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6279910