Re: [v3] Erlang

[Leo Famulari]

On Mon, Apr 04, 2016 at 12:50:12PM -0400, Leo Famulari wrote:
> On Mon, Apr 04, 2016 at 10:28:02AM +0200, Pjotr Prins wrote:
> > On Sun, Apr 03, 2016 at 11:39:24PM -0400, Leo Famulari wrote:
> > > Debian's package exhibits this problem. The timestamps are generated in
> > > the following places in the source code. I don't know how to approach
> > > this problem.
> > > 
> > > lib/kernel/test/global_SUITE_data/global_trace.erl:    io:format("The 
> > > trace was generated at ~p~n", [EndTime]),
> > > lib/reltool/bin/reltool.escript:    lists:flatten(io_lib:format("%% ~s 
> > > generated at ~w ~w\n~p.\n\n",
> > > lib/reltool/src/reltool_server.erl:    IoList = io_lib:format("%% config 
> > > generated at ~w ~w\n~p.\n\n",
> > > lib/reltool/src/reltool_target.erl:    RelIoList = io_lib:format("%% rel 
> > > generated at ~w ~w\n~p.\n\n",
> > > lib/reltool/src/reltool_target.erl:    ScriptIoList = io_lib:format("%% 
> > > script generated at ~w ~w\n~p.\n\n",
> > > lib/reltool/src/reltool_target.erl:            AppIoList = 
> > > io_lib:format("%% app generated at ~w ~w\n~p.\n\n",
> > > lib/reltool/src/reltool_target.erl:            AppIoList = 
> > > io_lib:format("%% app generated at ~w ~w\n~p.\n\n",
> > > lib/runtime_tools/src/erts_alloc_config.erl:      "generated at 
> > > ~w-~2..0w-~2..0w ~2..0w:~2..0w.~2..0w by "
> > > lib/sasl/src/systools_make.erl:       io:format(Fd, "%% script generated 
> > > at ~w ~w\n~p.\n",
> > > lib/wx/src/gen/gl.erl:%% The program object's information log is updated 
> > > and the program is generated at the time
> > 
> > If there is no easy work around I suggest simply patching them. Fortunately
> > the Erlang compiler does not change much at this level.
> 
> The ideal solution would be to use the value of the environment variable
> SOURCE_DATE_EPOCH if it is set, and else to behave as it does now.
> 
> > We can also contact Joe Armstrong, the author of Erlang, to discuss
> > this point. He appears to be approachable. I am sure he is open to
> > the idea of deterministic builds in a deterministic build system ;)
> 
> I could go to the Erlang IRC channel or forums (whatever they use) and
> ask for advice. Since you are actually using Erlang, I think you would
> be the better person to contact Joe Armstrong himself, if we decide to
> do that.

I presented the situation on IRC and it was recommended that I start the
discussion on a mailing list.

I think that the erlang-questions list [0] could be a good place to
start.

Pjotr, would you like to start the conversation? I can do it if you are
too busy or something.

[0]
http://www.erlang.org/community