recipes_emscripten: add ngspice

[proppy]

ported from https://github.com/conda-forge/ngspice-feedstock and https://github.com/hdl/conda-eda/tree/master/sim/ngspice

• removed unpackaged dependencies (openmp, x, readline)
• removed platform specific build
• removed outputs (not sure if they are supported by boa recipe spec)
• add emscripten prefix to build commands

/cc @stuarteberg (let me know if you don't want to be added there)

[DerThorsten]

hey @stuarteberg greetings =)

[stuarteberg]

@DerThorsten Small world. :-)

[stuarteberg]

@proppy I'm happy to remain on the maintainers list, though I may not be of much assistance.

[proppy]

curious if https://github.com/conda-forge/pyspice-feedstock/ would need to be repackaged as well, or if it can simply be taken from conda-forge (since it seems that it is pure python and calling out to ngspice-lib thru cffi).

[DerThorsten]

curious if https://github.com/conda-forge/pyspice-feedstock/ would need to be repackaged as well, or if it can simply be taken from conda-forge (since it seems that it is pure python and calling out to ngspice-lib thru cffi).

All noarch pks can be used from conda-forge

[proppy]

All noarch pks can be used from conda-forge

It doesn't look like pyspice is currently tagged as noarch: https://anaconda.org/conda-forge/pyspice/files

Does noarch needs to be transitive? While PySpice doesn't build any C code, it does depends on arch specific packages (ngspice-lib and cffi)?

maybe @stuarteberg knows more?

[DerThorsten]

You probably need to do smth like

# CLI
... -DCMAKE_PROJECT_INCLUDE=overwriteProp.cmake

# overwriteProp.cmake
set_property(GLOBAL PROPERTY TARGET_SUPPORTS_SHARED_LIBS TRUE)
set(CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS "-s SIDE_MODULE=1")
set(CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS "-s SIDE_MODULE=1")
set(CMAKE_STRIP FALSE)  # used by default in pybind11 on .so modules

See emscripten-core/emscripten#15276 (comment)

[DerThorsten]

otherwise cmake refused to build shared libraries with emscripten

[DerThorsten]

otherwise cmake refused to build shared libraries with emscripten