RedCloth Fails to Render Non-ASCII Characters Correctly on arm64 Architecture

[HusseinMorsy]

Introduction:

To accurately demonstrate and test the issue, I set up two virtual servers on Hetzner Cloud, each with a different architecture: one server utilizes an arm64 (Ampere) processor, and the other uses an Intel Xeon (x86_64) processor. This configuration ensures that the comparison and results of the RedCloth gem's behavior on different architectures are consistent and controlled.

Environment: Ubuntu 24.04 LTS - arm64 (Ampere) & x86_64 (Intel Xeon) on Hetzner Cloud

Issue: Non-ASCII characters are not rendering correctly on the arm64 architecture.

Steps to reproduce:

1. Set up a fresh installation of Ubuntu 24.04 LTS.

2. Install necessary packages and the RedCloth gem:

   apt-get update -qq
   apt-get install --no-install-recommends -y build-essential ruby-dev
   gem install RedCloth
   irb

   This installs Ruby 3.2.3 and RedCloth 4.3.4 and opens the Ruby interactive shell.

3. Inside the Ruby interactive shell:

   require 'redcloth'
   puts RedCloth.new("Müller").to_html

Results:

Architecture	Output
arm64	<p>M</p>
x86_64	<p>Müller</p>

Expected: Both architectures should render <p>Müller</p>.
Actual: The arm64 architecture does not render non-ASCII characters correctly.

Would appreciate any insights or suggestions on how to address this issue.

[HusseinMorsy]

Workaround: If you build the gem yourself on arm64, then it works.
For compiling the project, you need the Ragel package.

apt-get install ragel

[GregThoma]

Yes send me your code

[dushanstoryful]

Change your cloth from red to blue :) . Try gem 'bluecloth'

[khustochka]

Seeing the same with Cyrillic in ARM64 Docker image.