Failed build in Simulation mode in some computers (MacOS) about enigma-core

[lacabra]

It's also worth noting that in the machines where the build fails, it also throws the following error earlier:

error[E0463]: can't find crate for `std`
  --> /root/.cargo/git/checkouts/rust-sgx-sdk-fc8771c5c45bde9a/212d9f4/xargo/sgx_tunittest/../../sgx_tunittest/src/lib.rs:88:1
   |
88 | extern crate sgx_tstd as std;
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ can't find crate

error: aborting due to previous error

which is resolved by running the following as suggested in this repo's README:

rm -rf /root/.cargo/git/checkouts/rust-sgx-sdk-fc8771c5c45bde9a/212d9f4/xargo

But this error does not happen in the Linux machines where the build succeeds.

[lacabra]

Figured it out: the JOBS=8 was the culprit.

The parameter JOBS sets the number of parallel jobs, which defaults to the number of CPUs. The Macs in question have an i7 processor with 4 CPUs. It seems that setting JOBS to a number higher than the number of processors in your system results in a crash or an unpredictable behavior.

Compiling with JOBS=1, JOBS=4 or removing the JOBS altogether, causes the build to succeed. Documenting this here for future reference, and closing.