build(cython): link each extension module against the component it uses - #1920
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Included review availability: Your plan provides up to 12 included reviews per hour; 9 remain after this review. 📝 WalkthroughWalkthroughUpdated Python extension CMake files to use owning ChangesPython extension target linkage
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix Merge Risk: ⚪ Minimal · up to No concrete current-head issue remains identified; the change is ready for normal merge checks. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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In `@python/cuopt/cuopt/routing/CMakeLists.txt`:
- Line 7: Guard the Python routing extensions when SKIP_ROUTING_BUILD is
enabled: in python/cuopt/cuopt/CMakeLists.txt, wrap both
add_subdirectory(distance_engine) and add_subdirectory(routing) in an if(NOT
SKIP_ROUTING_BUILD) condition. The linked_libraries definitions in
python/cuopt/cuopt/routing/CMakeLists.txt and
python/cuopt/cuopt/distance_engine/CMakeLists.txt require no direct changes.
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python/cuopt/cuopt/CMakeLists.txtpython/cuopt/cuopt/distance_engine/CMakeLists.txtpython/cuopt/cuopt/grpc/client/CMakeLists.txtpython/cuopt/cuopt/linear_programming/data_model/CMakeLists.txtpython/cuopt/cuopt/linear_programming/internals/CMakeLists.txtpython/cuopt/cuopt/linear_programming/io/CMakeLists.txtpython/cuopt/cuopt/linear_programming/solver/CMakeLists.txtpython/cuopt/cuopt/linear_programming/solver_settings/CMakeLists.txtpython/cuopt/cuopt/routing/CMakeLists.txt
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Every extension module set linked_libraries to cuopt::cuopt, so each one pulled both engines regardless of what it called. That makes the optional dependency groups in #1635 meaningless, since installing the routing group still drags in the LP solver. Each module now names the component it resolves symbols from: distance_engine routing grpc/client client lp/data_model mathopt + client lp/io client lp/solver mathopt + client lp/solver_settings mathopt + client routing routing + client lp/internals resolves no cuOpt symbols at all -- it is callback plumbing -- but still needs the public headers, so it names the client and --as-needed drops the dependency entirely. Uses the exported target names. Note cuopt_client is exported as cuopt::client while its in-tree alias is cuopt::cuopt_client, unlike routing and mathopt which match; find_package consumers must use the former. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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distance_engine and routing now link cuopt::routing, which only exists inside if(NOT SKIP_ROUTING_BUILD). Linking the umbrella hid this before, since that target is defined either way, so a routing-less install would now fail at configure. Guarded on TARGET cuopt::routing rather than on SKIP_ROUTING_BUILD: this build only calls find_package(cuopt) and never sees that option, so testing the variable would always pass and leave the failure in place. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
The gRPC extension wraps cython_grpc_client, which is appended to the client sources only inside if(NOT SKIP_GRPC_BUILD). cuopt::client itself is defined in every configuration, so its presence tells a consumer nothing and the module would fail to link against a client built without that arm. rapids_export now emits CUOPT_HAS_GRPC into both the install and build configs, and the Python bindings skip the extension when it is off. Unlike the routing guard this is not a regression from this PR -- the subdirectory was unguarded on main too, where the umbrella target hid the same problem. Verified both paths by flipping the flag in the installed config: with it on the module builds, with it off the wheel builds cleanly and the extension is absent. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Addressing Nicolas's point about the gRPC side — done in a92dea7, alongside the routing guard in 46d644b. The two cases turn out to differ in an important way. Routing was a regression from this PR. gRPC is not a regression — the subdirectory was unguarded on main too, and the umbrella hid the same problem. On the parenthetical — Verified both paths by flipping the flag in the installed config: with it on the extension builds, with it off the wheel builds cleanly and the extension is absent. The full mapping is also re-verified against main — every module has the right 🤖 Generated with Claude Code |
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Inline comments:
In `@python/cuopt/cuopt/CMakeLists.txt`:
- Around line 10-16: The gRPC Python extension must also require the routing
target because cython_grpc_client_vrp.cpp is absent when routing is skipped.
Update the conditional in the top-level CMake configuration around
add_subdirectory(grpc) to use both CUOPT_HAS_GRPC and TARGET cuopt::routing,
while preserving the existing skip status message for unsupported builds.
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CUOPT_HAS_GRPC alone was not enough. One extension module covers both arms, and it calls submit_vrp/result_vrp, which live in cython_grpc_client_vrp.cpp. That file is appended to the client only under CUOPT_ENABLE_GRPC_ROUTING, so a SKIP_ROUTING_BUILD build with gRPC on left the module with unresolved VRP symbols. rapids_export now reports CUOPT_HAS_GRPC_ROUTING alongside CUOPT_HAS_GRPC, and the extension requires both. Reported as its own flag rather than inferred from TARGET cuopt::routing: CUOPT_ENABLE_GRPC_ROUTING is what gates those sources, and the two would diverge the moment the VRP arm gains an option of its own. Verified by flipping the flag in the installed config: with the VRP arm off the wheel builds cleanly and the extension is absent, with it on the module is built. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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The three component libraries installed together under `COMPONENT runtime`, and every header went out in a single `install(DIRECTORY include/cuopt/)`, so the build could not say which files belong to which library. That blocks the per-solver packages in #1635. Each component now installs under its own name: | Component | Contents | |---|---| | `client` / `mathopt` / `routing` | the `.so`, plus `cuopt_cli` under `mathopt` | | `client-dev` / `mathopt-dev` / `routing-dev` | that component's public headers | | `grpc-server` | `cuopt_grpc_server` | | `dev` | the `libcuopt.so` linker script | A plain `cmake --install` still installs everything, so packaging is unchanged by this PR. Draft until #1920 merges. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Authors: - Ramakrishna Prabhu (https://github.com/ramakrishnap-nv) Approvers: - Trevor McKay (https://github.com/tmckayus) URL: #1926
Every Cython extension module set
linked_librariestocuopt::cuopt, so each one pulled both engines regardless of what it actually called. Until they name their own component, the optional-dependency groups planned in #1635 achieve nothing — installing the routing group still drags in the LP solver.Each module now links the component it resolves symbols from:
distance_engineandroutingagainstcuopt::routing, the gRPC client and the LP data model, parser and internals againstcuopt::client, and the LP solver and solver settings againstcuopt::mathoptpluscuopt::client.First item of #1635, split out so the packaging work starts from a clean base.
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