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Design: C realization of the shared CompilationUnit linkage-unit shape (R3 .h/.c + include-closure + link-cyclic; R4 permissive) - #6717
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…e (R3 .h/.c + include-closure + link-cyclic; R4 permissive) 2nd realization (against the interface locked with the Rust realization, docs/plans/emitted-crate-partition-design.md) staffed specifically to stress-test that the shared CompilationUnit shape doesn't bake in Rust's acyclic-linkage assumption. Verdict: yes, the locked shape expresses C's .h/.c split and link-cyclic axis without contortion — R3 renders members/interface into .c/.h, R4 accepts the cyclic partitions Rust R4 refuses and instead refuses on cyclic by-value type containment or a split symbol definition. One non-blocking richness call-out to the shared-home author: interface must carry full type definitions for by-value crossings, not just symbol names. Design only — implementation is gated on the shared home landing (sibling lane, adhoc-85078326-fdb) + main-green. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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Design artifact (docs-only) — the C realization of the shared, target-agnostic
CompilationUnitcontract locked with the Rust realization (docs/plans/emitted-crate-partition-design.md, PR #6708). C is staffed as the 2nd realization specifically to stress-test that the shared shape doesn't silently cement Rust's acyclic-linkage assumption.Why C
Rust crates (and Go packages) require acyclic linkage; C translation units may mutually
#include/reference and still link cleanly. Proving the sameCompilationUnitshape expresses both — Rust R4 refusing a cyclic partition, C R4 accepting the identical cyclic partition — is the discriminating test that the shape is genuinely agnostic.What this doc covers
.h/.csplit renders the existingmembers(input)/interface(derived) fields — no shape change needed; cross-unit reference =#include+ forward-decl fromdeps; translation-unit identity = preprocessor include-closure;artifact=.o+ link step (extends the#6650cchost transport).v2.std.determinism/std.perturbation(partition = non-semantic perturbation axis, same as the Rust doc — no new concept). Four discriminating witnesses: 1-unit, N-unit-acyclic, N-unit-cyclic (load-bearing — proves the C axis), and a genuinely-invalid partition's typed refusal.adhoc-85078326-fdb):interfacemust be able to carry a full type definition for by-value boundary crossings, not just a symbol name — expected already true since it's an opaqueNodecarrier, flagged for confirmation, not filed as a shape-break escalation.Staging
Design only. Implementation is gated on the shared home (
CompilationUnit/partition_fold/R4 interface/Provenance) landing (sibling lane) + main-green, mirroring the Rust design doc's gating.🤖 Generated with Claude Code