Motivation for this change

Onnxruntime is a scoring engine for ML models. Somewhat of a competitor against other scoring engines such as tensorflow.

This is just the initial starting point for cpu-enabled dynamically linked libraries. CUDA, MKL, and other refinements are due later. Not really feasible with how integrated their cmake + git-submodule layout is right now

cc @costrouc because he's into ML stuff.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nix-review --run "nix-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.

Notify maintainers

cc @

closure size:

$ nix path-info -Sh ./result
/nix/store/pnq3kfg37cv6cxmhccwcpiqhw4gz95qv-onnxruntime-0.5.0     40.5M

just relies on gcc (for the time being):

$ nix-store -q --tree ./result
/nix/store/pnq3kfg37cv6cxmhccwcpiqhw4gz95qv-onnxruntime-0.5.0
+---/nix/store/iykxb0bmfjmi7s53kfg6pjbfpd8jmza6-glibc-2.27
|   +---/nix/store/iykxb0bmfjmi7s53kfg6pjbfpd8jmza6-glibc-2.27 [...]
+---/nix/store/pjx3f50x0qziyivs7rbg5s12p99nn2np-gcc-7.4.0-lib
    +---/nix/store/iykxb0bmfjmi7s53kfg6pjbfpd8jmza6-glibc-2.27 [...]
    +---/nix/store/pjx3f50x0qziyivs7rbg5s12p99nn2np-gcc-7.4.0-lib [...]

$ tree ./result/
./result/
└── lib
    ├── libonnxruntime.so -> libonnxruntime.so.0.5.0
    └── libonnxruntime.so.0.5.0

the result-dev/lib/cmake/protobuf is from onnxruntime doing a add_subdirectory on the entire protobuf codebase.

$ tree -L 3 ./result-dev
./result-dev
├── include
│   └── onnxruntime
│       └── core
├── lib
│   └── cmake
│       └── protobuf
└── nix-support
    └── propagated-build-inputs