Request: Support Heroku 18 stack about heroku-buildpack HOT 7 CLOSED

Oh hey, it seems llvm.org now hosts a build of clang for Ubuntu 18.04! I'll play around with it, and if we're lucky, the buildpack can be self-reliant again.

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Your assumption is close, but unfortunately not enough. The buildpack, as it is now, tries to download clang from llvm.org - where 18.04 builds are not available, and we need a different strategy.

I have previously found a working solution: we can install a proper version of clang using the heroku apt buildpack. The ext-clang branch here is compatible with that.

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I was thinking of changing the buildpack to work as it previously did on the 14 and 16 stacks, and print new instructions on 18 to set up the other buildpack.

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Any news?

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Not really. But if you can't wait, here's a working guide (quoting myself from the Vapor Discord server).

So assuming you have an already set up project on Heroku (with only the vapor buildpack), do the following:

1. Change the vapor buildpack to use the ext-clang branch, where I have removed the script that installs clang.

   heroku buildpacks:set https://github.com/vapor-community/heroku-buildpack.git#ext-clang

2. Add the apt buildpack at the first index (executed before the vapor buildpack):

   heroku buildpacks:add --index 1 https://github.com/heroku/heroku-buildpack-apt

3. Create an Aptfile to install a few things:

   cat <<EOF >Aptfile
   clang
   libssl1.0
   libssl1.0-dev
   EOF

4. Set the active stack to heroku-18:

   heroku stack:set heroku-18

5. Commit and deploy.

   git commit -am "Add Aptfile"
   git push heroku master

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@vzsg after upgrading to Heroku 18 using your guideline Vapor app bumped from 10 MB to 115 MB 😅 it's probably caused by installing

clang
libssl1.0
libssl1.0-dev

using Aptfile 🙂

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Hmm. That's bad news. libssl1.0 shouldn't be necessary anymore, but we need to find a way to install clang without it getting into the final slug.

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