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Showing content from https://github.com/rake-compiler/rake-compiler-dock/issues/117 below:

document how bundler and rubygems behave wrt `linux`, `linux-gnu`, and `linux-musl` releases · Issue #117 · rake-compiler/rake-compiler-dock · GitHub

We know that rubygems 3.33.22 / bundler 2.3.21 is required for basic support of linux-gnu and linux-musl platform names; but buggy bundler behavior prior to 2.5.6 may cause challenges for some users.

This issue is to record some research into how the default versions behave with different native platform gems, and to document recommendations for maintainers as to how and when to ship linux-gnu and linux-musl versions.

To help test this, I published "linux + linux-musl" and "linux-gnu + linux-musl" combinations of the gem rcee_precompiled which you can find at https://rubygems.org/gems/rcee_precompiled/versions.

• v0.5.0 and v0.5.0.1 are "linux + linux-musl"
• v0.5.1 is `"linux-gnu + linux--musl"

Note that the versions in question being tested below are:

and the alpine containers have build-base installed to compile the source gem if necessary.

We test Ruby 3.0 with updated rubygems because its default version is below the known minimum needed for this to work correctly (3.3.22).

Error [1]:

Could not find gems matching 'rcee_precompiled (= 0.5.0.1)' valid for all resolution platforms (aarch64-linux-musl,
aarch64-linux, arm-linux-musl, arm-linux, arm64-darwin, x86-linux-musl, x86-linux, x86_64-darwin, x86_64-linux-musl) in
rubygems repository https://rubygems.org/ or installed locally.

The source contains the following gems matching 'rcee_precompiled (= 0.5.0.1)':
  * rcee_precompiled-0.5.0.1-aarch64-linux
  * rcee_precompiled-0.5.0.1-aarch64-linux-musl
  * rcee_precompiled-0.5.0.1-arm-linux
  * rcee_precompiled-0.5.0.1-arm-linux-musl
  * rcee_precompiled-0.5.0.1-arm64-darwin
  * rcee_precompiled-0.5.0.1
  * rcee_precompiled-0.5.0.1-x64-mingw-ucrt
  * rcee_precompiled-0.5.0.1-x64-mingw32
  * rcee_precompiled-0.5.0.1-x86-linux
  * rcee_precompiled-0.5.0.1-x86-linux-musl
  * rcee_precompiled-0.5.0.1-x86_64-darwin
  * rcee_precompiled-0.5.0.1-x86_64-linux
  * rcee_precompiled-0.5.0.1-x86_64-linux-musl

Given the inconsisent behavior of gem and bundle when the gem in question ships linux and linux-musl platform gems, it seems pretty clear that it's not a good idea to do this.

So the recommendation has to be:

• either:
  • ship a -linux platform gem that works for both gnu and musl systems,
  • or ship both -linux-gnu and -linux-musl platform gems.
• do NOT ship -linux and -linux-musl platform gems for the same version.

The installation docs for users should contain some warnings:

• end users on Ruby 3.0 must be using gem 3.3.22 or later / bundler 2.3.21 or later to get basic support for precompiled gems (will fall back to installing the vanilla "ruby" platform gem) set required_rubygems_version for native gems that specify the linux libc rake-compiler#236
• end users on musl systems should be using bundler 2.5.6 or later to avoid on musl systems, bundler does not include the relevant musl native gem platform in the lock file rubygems/rubygems#7432

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