Create 5.x base branch#1571

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luispadron wants to merge 17 commits into

5.xfrom

Commits on Dec 20, 2025

Breaking-change: remove support for incremental compilation mode
luispadron
committed
Breaking-change: remove support for persistent worker
luispadron
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Cherry-pick: sync swift_runner code with upstream
luispadron
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Cherry-pick: remove remaining persistent worker support from the rules themselves.

allevato
authored and
luispadron
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Cherry-pick: add support for parallel compilation
luispadron
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Cherry-pick: Add initial parallel compilation support
luispadron
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Cherry-pick: Disable parallel compilation if an optimization flag in the -O group is being used.
luispadron
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Cherry-pick: simplify how we represent single-batch codegen jobs by passing an empty string instead of the full list of object files.
luispadron
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Fix: force swift.compile_in_parallel in the tests that depend on looking up specific mnemonics.
luispadron
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Cherry-pick: add tests for parallel compilation to make sure that the various optimization modes interact as we expect.
luispadron
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Cherry-pick: update parallel compilation to handle optimization correctly.
luispadron
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Fix: broken swift_runner progress messages

brentleyjones
authored and
luispadron
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Cherry-pick: also detect `-O` flags being set via `--swiftcopt` when planning parallel compilation.
luispadron
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Cherry-pick: fix another edge case in compile planning; this time if `-c opt` is used and `-wmo` is passed on the command line.
luispadron
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Breaking-change: fully remove split derived files feature
luispadron
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Fix: parallel compilation on Linux due to params file
luispadron
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Chore: rebase and fix conflicts with latest main
luispadron
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