"deterministic" compile config option similar to erlang compiler

[pavels]

Erlang has deterministic option for compilation wit following meaning:

Omit the options and source tuples in the list returned by Module:module_info(compile), and reduce the paths in stack traces to the module name alone. This option will make it easier to achieve reproducible builds.

It would be nice to have this in Elixir - especially the source omission. Sometimes it is necessary to be able to produce builds which are binary exactly the same and as it is now, you would need to do this on exactly same source paths.

I would even volunteer to make a PR, problem is, the build process of Elixir is quiet impenetrable to me. Tried multiple times to get a grasp on what's going on, but failed, so i would at least need some hints on where to start.

[josevalim]

This option should just work for Elixir too, as Elixir delegates to the Erlang compiler. Have you tried this route? If so, what is being different between the BEAM files? -- *José Valim* www.plataformatec.com.br Skype: jv.ptec Founder and Director of R&D

[pavels]

I tried to put it in erlc_options - it affects only compilation of .erl files from src folder (and there it works as documented). It has no effect on .ex files from lib .

[josevalim]

You can set it via environment variables:

ERL_COMPILER_OPTIONS=deterministic mix compile --force

[pavels]

THAT WORKS :) - i should better read the manual next time
thank you very much