Faasm supports OpenMP by implementing the OpenMP runtime functions as part of the host interface (see below for details).
To compile, upload and run the prebuilt OpenMP demo function:
inv compile omp hellomp
inv upload omp hellomp
inv invoke omp hellomp
Runtime OMP functions are implemented just like any other host interface function
and can be found in src/wasm/syscalls_openmp.cpp.
The list of acceptable unresolved imports is in lib-faasmp/faasmp.imports.
To add a new function you need to include it in both of these files.