Cannot install 3.25.0.rc.2 on Ruby 3.3.0-preview2

[marcotc]

What version of protobuf and what language are you using?
Version: 3.25.0.rc.2
Language: Ruby

What operating system (Linux, Windows, ...) and version?

Docker ruby:3.3.0-preview2: Linux 387032e9f908 5.15.49-linuxkit #1 SMP Tue Sep 13 07:51:46 UTC 2022 x86_64 GNU/Linux

What runtime / compiler are you using (e.g., python version or gcc version)

ruby 3.3.0preview2 (2023-09-14 master e50fcca9a7) [x86_64-linux]
gcc version 12.2.0 (Debian 12.2.0-14)

What did you do?
Steps to reproduce the behavior:

1. Execute docker run --rm -it ruby:3.3.0-preview2 gem install google-protobuf -v 3.25.0.rc.2
2. See error: LoadError: cannot load such file -- ffi-compiler/compile_task

What did you expect to see

Gem installed successfully.

What did you see instead?

Fetching google-protobuf-3.25.0.rc.2.gem
Building native extensions. This could take a while...
ERROR:  Error installing google-protobuf:
	ERROR: Failed to build gem native extension.

    current directory: /usr/local/bundle/gems/google-protobuf-3.25.0.rc.2/ext/google/protobuf_c
/usr/local/bin/ruby -rrubygems /usr/local/lib/ruby/gems/3.3.0+0/gems/rake-13.0.6/exe/rake RUBYARCHDIR\=/usr/local/bundle/extensions/x86_64-linux/3.3.0+0/google-protobuf-3.25.0.rc.2 RUBYLIBDIR\=/usr/local/bundle/extensions/x86_64-linux/3.3.0+0/google-protobuf-3.25.0.rc.2
rake aborted!
LoadError: cannot load such file -- ffi-compiler/compile_task
<internal:/usr/local/lib/ruby/3.3.0+0/rubygems/core_ext/kernel_require.rb>:128:in `require'
<internal:/usr/local/lib/ruby/3.3.0+0/rubygems/core_ext/kernel_require.rb>:128:in `require'
/usr/local/bundle/gems/google-protobuf-3.25.0.rc.2/lib/google/tasks/ffi.rake:1:in `<top (required)>'
(See full trace by running task with --trace)

rake failed, exit code 1

Gem files will remain installed in /usr/local/bundle/gems/google-protobuf-3.25.0.rc.2 for inspection.
Results logged to /usr/local/bundle/extensions/x86_64-linux/3.3.0+0/google-protobuf-3.25.0.rc.2/gem_make.out

Anything else we should know about your project / environment

[JasonLunn]

How are protobuf dependencies installed in this environment? The gemspec lists the https://github.com/ffi/ffi-compiler as a development dependency. Installing that gem first explicitly should fix the immediate problem as a workaround, but there is more than one development dependency.

[JasonLunn]

bundle install installs the development dependencies automatically, but gem install doesn't. The #14538 adds a safety check so that users can gem install without having ffi-compiler if they don't need access to the new FFI-based implementation.