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feat: duplicate C exports across #import c units are a compile diagnostic

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All units share one link namespace (per-unit isolation is PLAN-C C3.2,
deferred), so a symbol defined by two units previously died inside the
JIT dylib link or the AOT link with raw linker spew. The clang shim
gains sx_clang_object_exported_symbols (llvm::object scan: defined +
global, format-specific excluded) and compileCToObjects cross-checks
every unit object — collisions name both source files. Scan failures
are non-fatal; the linker remains the backstop. Covers JIT and native
AOT; the emcc path still relies on wasm-ld's own error.
This commit is contained in:
agra
2026-06-12 19:01:43 +03:00
parent 6114b51073
commit 9fb7290861
9 changed files with 122 additions and 0 deletions
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examples/expected/1628-cimport-duplicate-export.exit Normal file
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examples/expected/1628-cimport-duplicate-export.stderr Normal file
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error: C symbol 'clash' is defined by multiple '#import c' sources: 'examples/1628-cimport-duplicate-export/a.c' and 'examples/1628-cimport-duplicate-export/b.c' — all units share one link namespace

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examples/expected/1628-cimport-duplicate-export.stdout Normal file
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