Persistent Builds Issue: Dependencies Recompiling Every Time

Phoenix Forum Questions / Help
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I’m currently working on an Elixir project using Visual Studio Code (VSCode) as my development environment. Unfortunately, I’ve encountered an issue with persistent builds and dependency compilation.

When I run mix commands in my project, it seems that Elixir recompiles all the dependencies every single time, making the development process slower than expected. However, I noticed that when I develop the same project within a Docker container, the dependencies are compiled only once, and subsequent mix commands are significantly faster.

I’ve already tried enabling persistent builds by setting the MIX_ENV environment variable to “dev” and running mix compile --persistent, but this doesn’t seem to resolve the issue.

Here’s what I’ve done so far:

  • Set MIX_ENV to “dev” both locally and within the Docker container.
  • Checked my Elixir version (I’m using the latest stable version).
  • Cleaned the project using mix clean.
  • Verified the MIX_ENV variable to ensure it is correctly set.

Unfortunately, none of these actions have made a difference, and I’m still facing the same problem. It’s puzzling that the behavior is different between my local environment and the Docker container.

Has anyone else experienced a similar issue with Elixir dependencies recompiling every time? I’d greatly appreciate any insights, suggestions, or tips on how to resolve this situation. Perhaps I’m missing something essential or there’s a configuration I need to adjust?

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Solved: i solved the issue by running mix clean then mix setup when starting to work on a project. I don’t know the reason or why it happened or how it gets fixed but it works for me :slight_smile:

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When in doubt, always nuke the _build and deps directories from orbit first.

3 Likes
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builds go KabooM !!

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Confusingly, this seems to claim the opposite to what’s been claimed is the solution here. :thinking: Namely that there were no mounted directory for _build. But OP here is saying that locally stuff is recompiled every time while it’s working as intended in Docker. What gives?

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i may have tried mix clean before but it didn’t work. I also updated my system so it may have something to do with it too :thinking:

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Sorry, I posted the wrong link, then fixed it. But I guess you saw the incorrect one :eyes:

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i thought you were replying to my comment :sweat_smile: sorry for the confusion