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bug(server): internal/server/deepdoc fails to compile without cgo #21990
Description
Summary
In internal/server/deepdoc/server.go, RegisterNativeDeepDoc references infnative.Register, infnative.Serving, native.ValidateInferenceConfig, native.SetIntraOpThreads, and native.SetInferenceLimit. Both ragflow/internal/deepdoc/native and ragflow/internal/deepdoc/parser/pdf/inference/native_analyzer are gated with //go:build cgo. Because server.go itself has no build tag and lacks a !cgo fallback, compiling ragflow_server or running tools/checks under CGO_ENABLED=0 fails with multiple undefined symbol errors:
# ragflow/internal/server/deepdoc
internal/server/deepdoc/server.go:70:22: undefined: infnative.Register
internal/server/deepdoc/server.go:79:16: undefined: infnative.Serving
internal/server/deepdoc/server.go:118:51: undefined: native.ValidateInferenceConfig
internal/server/deepdoc/server.go:124:9: undefined: native.SetIntraOpThreads
internal/server/deepdoc/server.go:126:9: undefined: native.SetInferenceLimit
internal/server/deepdoc/server.go:181:61: undefined: infnative.DefaultDropScore
internal/server/deepdoc/server.go:183:19: undefined: infnative.DefaultDropScore
Expected behavior
internal/server/deepdoc should provide a !cgo fallback for RegisterNativeDeepDoc that fails closed (returning ErrDeepDocCGORequired), mirroring the pattern established across sibling packages (e.g. internal/agentic_rag/decisionhead), allowing non-cgo tools, go vet, and compilation to succeed while preserving the P0 fail-fast requirement when cgo is disabled.
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