I also looked here:
https://hexdocs.pm/elixir/config-and-releases.html#releases

On Tuesday, February 27, 2024 at 1:48:37 PM UTC+1 Patrick Glind wrote:

> Hi José,
>
> I was looking for something like this, however the mix release page only 
> shows `runtime_config_path: ...`
> here:
>
> https://hexdocs.pm/mix/1.16.1/Mix.Tasks.Release.html#module-runtime-configuration
>
> and on the bottom of the page I see CLI options, which don't mention the 
> runtime_config_path, so I assumed
> I had to use the CLI --path option (which I currently do)
>
> Is there some docs I'm missing with more information about the mix.exs 
> releases configuration/options?
> - I was also looking for a way to change the default release using the 
> mix.exs file, but couldn't really find anything about that either
> in the docs.
>
> Thank you for your ongoing development of the language!
>
> On Tuesday, February 27, 2024 at 12:34:19 PM UTC+1 José Valim wrote:
>
>> Doing this now would certainly be a breaking change as it would break all 
>> usages of mix release today.
>>
>> The easiest way to go about this is to add a "path: " key to your release 
>> configuration in your mix.exs, in which you can employ any triple target 
>> that you want. :erlang.system_info(:system_architecture) may be a good 
>> starting point.
>>
>> On Tue, Feb 27, 2024 at 12:17 PM Patrick Glind <nax...@gmail.com> wrote:
>>
>>> Hi team,
>>>
>>> I'm developing on a Mac and deploying/running in production on Linux.
>>>
>>> Because cross compilation currently doesn't work, I've added a simple 
>>> Docker run
>>> script that does a mix release in order to create a Linux runnable 
>>> output.
>>>
>>> Currently it's not clear that this mix release is targeting Linux and 
>>> sometimes I 'mix'
>>> the releases when I want to do a quick test on the Mac (which fails to 
>>> execute)
>>> and on occasion I remove the _build folder to ensure I'm not messing up 
>>> compilation/releases.
>>>
>>> Currently I'm solving this problem by using `mix release --path ...` in 
>>> the Docker script to add /linux/ as a sub path in the _build folder and 
>>> stay clear of the Mac output.
>>>
>>> I was dabbling a little bit into Rust the other day and saw that their 
>>> `cargo build --release`
>>> when cross compiling adds the triple target in the path like so:
>>> `/target/x86_64-pc-windows-gnu/debug/`
>>>
>>> It would be handy to have a triple target folder in the path as well for 
>>> Elixir
>>> either as a default or as a mix.exs -> releases: option
>>> (I know a default would likely break things, so a releases option might 
>>> be better)
>>>
>>> Especially if Elixir ever supports cross compilation being able to 
>>> distinguish between
>>> the _build sub folders would be a benefit.
>>>
>>> Thank you for consideration
>>>
>>>
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>>>
>>

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