Elixir Issues with Compiled C NIF Library about mirrord HOT 1 OPEN

Summarizing from discussion over Discord:

mirrord is built as a universal binary for Mac devices. This is why when you run a command to print the architecture, it will give results that look like it's running either as 32-bit or 64-bit x86 machine:

$ mirrord exec -- uname -p
i386
$ mirrord exec -- uname -m
x86_64

What's most likely happening is that bcrypt is then building an x86 shared object:

$ file _build/dev/lib/bcrypt_elixir/priv/bcrypt_nif.so
_build/dev/lib/bcrypt_elixir/priv/bcrypt_nif.so: Mach-O 64-bit dynamically linked shared library x86_64

and mix is having issues loading that properly once it tries to run any relevant commands.

The best workaround is to precompile dependencies mix deps.compile in advance of starting up the process via mirrord.

from mirrord.