https://git.ruby-lang.org/ruby.git/commit/?id=f27e0d90c8

From f27e0d90c865a19d42c222a82e13ee4c40352bf7 Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Sun, 24 May 2020 03:58:59 +0900
Subject: ext/fiddle/fiddle.gemspec: avoid require lib/fiddle/version.rb

It loads `ext/fiddle/lib/fiddle/version.rb`, which causes constant
redefinition warning:

http://rubyci.s3.amazonaws.com/ubuntu2004/ruby-master/log/20200523T153003Z.log.html.gz
```
[ 6317/20193] TestDefaultGems#test_validate_gemspec/home/chkbuild/chkbuild/tmp/build/20200523T153003Z/ruby/ext/fiddle/lib/fiddle/version.rb:2: warning: already initialized constant Fiddle::VERSION
/home/chkbuild/chkbuild/tmp/build/20200523T153003Z/ruby/.ext/common/fiddle/version.rb:2: warning: previous definition of VERSION was here
 = 0.16 s
```

This changeset read the version by manual parsing hack which is also
used in stringio and zlib.

diff --git a/ext/fiddle/fiddle.gemspec b/ext/fiddle/fiddle.gemspec
index 0229d3e..befa7ae 100644
--- a/ext/fiddle/fiddle.gemspec
+++ b/ext/fiddle/fiddle.gemspec
@@ -1,15 +1,18 @@ https://github.com/ruby/ruby/blob/trunk/ext/fiddle/fiddle.gemspec#L1
 # frozen_string_literal: true
 
-begin
-  require_relative "lib/fiddle/version"
-rescue LoadError
-  # for Ruby core repository
-  require_relative "version"
+source_version = ["", "ext/fiddle/"].find do |dir|
+  begin
+    break File.open(File.join(__dir__, "#{dir}lib/fiddle/version.rb")) {|f|
+      f.gets("\n  VERSION = ")
+      f.gets[/\s*"(.+)"/, 1]
+    }
+  rescue Errno::ENOENT
+  end
 end
 
 Gem::Specification.new do |spec|
   spec.name          = "fiddle"
-  spec.version       = Fiddle::VERSION
+  spec.version       = source_version
   spec.authors       = ["Aaron Patterson", "SHIBATA Hiroshi"]
   spec.email         = ["aaron@t...", "hsbt@r..."]
 
-- 
cgit v0.10.2


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