https://git.ruby-lang.org/ruby.git/commit/?id=d23b3d9b7d

From d23b3d9b7dc2964da36dc9daf96718b1867adcae Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Wed, 17 Nov 2021 15:08:46 +0900
Subject: Prevent "already initialized constant Digest::VERSION"

http://rubyci.s3.amazonaws.com/ubuntu1804/ruby-master/log/20211117T033003Z.log.html.gz
```
installing default gems from ext:   /home/chkbuild/chkbuild/tmp/build/20211117T033003Z/lib/ruby/gems/3.1.0
/home/chkbuild/chkbuild/tmp/build/20211117T033003Z/ruby/ext/digest/lib/digest/version.rb:4: warning: already initialized constant Digest::VERSION
/home/chkbuild/chkbuild/tmp/build/20211117T033003Z/ruby/.ext/common/digest/version.rb:4: warning: previous definition of VERSION was here
```

This hack is copied from ext/psych/psych.gemspec
---
 ext/digest/digest.gemspec | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/ext/digest/digest.gemspec b/ext/digest/digest.gemspec
index d27d82148c1..f8dff1797a5 100644
--- a/ext/digest/digest.gemspec
+++ b/ext/digest/digest.gemspec
@@ -1,11 +1,14 @@ https://github.com/ruby/ruby/blob/trunk/ext/digest/digest.gemspec#L1
 # coding: utf-8
 # frozen_string_literal: true
 
-require_relative 'lib/digest/version'
+version_module = Module.new do
+  version_rb = File.join(__dir__, "lib/digest/version.rb")
+  module_eval(File.read(version_rb), version_rb)
+end
 
 Gem::Specification.new do |spec|
   spec.name          = "digest"
-  spec.version       = Digest::VERSION
+  spec.version       = version_module::Digest::VERSION
   spec.authors       = ["Akinori MUSHA"]
   spec.email         = ["knu@i..."]
 
-- 
cgit v1.2.1


--
ML: ruby-changes@q...
Info: http://www.atdot.net/~ko1/quickml/