omp.h missing

[adrianlut]

Hi,

I want to use some of the supported runtime routines of OpenMP inside the enclave, for example omp_set_num_threads. However, I noticed that although pthread.h is included in the SDK (under include/tlibc), omp.h is not, causing compilation to fail with

Enclave.cpp:35:10: fatal error: omp.h: No such file or directory
   35 | #include <omp.h>
      |          ^~~~~~~

Why is omp.h not included? Is there some easy workaround I am missing? Thanks!

[llly]

OpenMP is not exposed in SGXSDK. You can follow the steps to use it in SGX enclave.

1. Build SGXSDK.
2. Copy header file. cp external/openmp/openmp_code/final/build/runtime/src/omp.h $SGX_SDK/include/
3. Update Makefile. Add -fopenmp at the end of SGX_COMMON_FLAGS, and Add -lsgx_pthread -lsgx_omp between -Wl,--start-group and -Wl,--end-group of Enclave_Link_Flags
4. Update EDL file. Add from "sgx_pthread.edl" import *;

[ChampionNan]

#826
Hi, maybe you can follow this.

[adrianlut]

Hi @llly,

thank you very much for the guide. Building the SDK and copying the header file solved my problem. I already had the flags and EDL import setup.

However, I still want to ask if there is a special reason for not including this header file in the installer. Since a lot of functions from OpenMP are described as supported in the documentation, I would expect that it is possible to use them out of the box.

Maybe omp.h could be added to the default installer in one of the next SDK versions.

[andyzyb]

We don't plan to support/release OpenMP as part of the SDK. It is more a side effect of enabling DNNL.

Any issues or new feature requests of using OpenMP probably won't be fixed/supported. That's why omp.h is not included.

[adrianlut]

Ok, thank you for the clarification!