[erlang-questions] releases + warning for application resource file

[Tristan Sloughter]

Verified and created a rebar3 ticket https://github.com/erlang/rebar3/issues/2119

On Fri, Jul 5, 2019, at 11:02, Tristan Sloughter wrote:
> Sadly there is a way to tell systools to run an xref check before 
> generating the boot script based on what will be in the release, but it 
> is not possible to add it to the options through relx at this time, 
> http://erlang.org/doc/man/systools.html#make_script-2
> 
> My plan is for exref to be a default option used by relx in the next 
> major release, discussed here https://github.com/erlware/relx/issues/729
> 
> I've been meaning to check if 'rebar3 xref' can catch stuff like this 
> or if it needs to change to work properly on only the runtime 
> dependencies specified by an application. I'll take a look at that 
> today and also open an issue for rebar3 if that is the case.
> 
> Tristan
> 
> On Fri, Jul 5, 2019, at 10:26, Nato wrote:
> > Is there a heuristic or tactic for ensuring that
> > one's application includes all the necessary OTP
> > applications (listed in the application resource
> > file's list of `applications')?
> > 
> > I've had it happen a couple times where
> > I'll use a module belonging to, say `inets,'
> > compiling is just fine, code works locally,
> > and release-building is all good too.
> > However, I'll ship the release and since 
> > `inets' wasn't listed in the application 
> > resource file, at runtime, calling, say 
> > `httpd_util' module, falls over.
> > 
> > I suppose I'm looking to toggle on something
> > in `relx' or even better, `erlc' to Error-out
> > when my code calls modules that won't be 
> > accessible in a release.
> > 
> > --
> > Nato
> > 
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