From fe290a41738a17abe412d9167d24c1d11cc7df30 Mon Sep 17 00:00:00 2001
From: Benoit Daloze <eregontp@gmail.com>
Date: Fri, 24 Nov 2023 13:14:56 +0100
Subject: [PATCH] Do not compile the C extension on TruffleRuby

* Before this it was compiled but not used, because TruffleRuby has
  a stringio.rb in stdlib and .rb has precedence over .so.
  In fact that extension never worked on TruffleRuby,
  because rb_io_extract_modeenc() has never been defined on TruffleRuby.
* So this just skip compiling the extension since compilation of it now fails:
  https://github.com/ruby/openssl/issues/699
---
 Rakefile                | 10 ++++++----
 ext/stringio/extconf.rb |  6 +++++-
 2 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/Rakefile b/Rakefile
index 1a16b54..c8cd706 100644
--- a/Rakefile
+++ b/Rakefile
@@ -3,7 +3,7 @@ require "rake/testtask"
 
 name = "stringio"
 
-if RUBY_PLATFORM =~ /java/
+if RUBY_ENGINE == "jruby"
   require 'rake/javaextensiontask'
   extask = Rake::JavaExtensionTask.new("stringio") do |ext|
     ext.lib_dir << "/#{ext.platform}"
@@ -13,15 +13,17 @@ if RUBY_PLATFORM =~ /java/
   end
 
   task :build => "#{extask.lib_dir}/#{extask.name}.jar"
-else
+elsif RUBY_ENGINE == "ruby"
   require 'rake/extensiontask'
   extask = Rake::ExtensionTask.new(name) do |x|
     x.lib_dir << "/#{RUBY_VERSION}/#{x.platform}"
   end
+else
+  task :compile
 end
 Rake::TestTask.new(:test) do |t|
-  ENV["RUBYOPT"] = "-I" + [extask.lib_dir, "test/lib"].join(File::PATH_SEPARATOR)
-  t.libs << extask.lib_dir
+  ENV["RUBYOPT"] = "-I" + [*(extask.lib_dir if extask), "test/lib"].join(File::PATH_SEPARATOR)
+  t.libs << extask.lib_dir if extask
   t.libs << "test/lib"
   t.ruby_opts << "-rhelper"
   t.test_files = FileList["test/**/test_*.rb"]
diff --git a/ext/stringio/extconf.rb b/ext/stringio/extconf.rb
index ad8650d..553732f 100644
--- a/ext/stringio/extconf.rb
+++ b/ext/stringio/extconf.rb
@@ -1,3 +1,7 @@
 # frozen_string_literal: false
 require 'mkmf'
-create_makefile('stringio')
+if RUBY_ENGINE == 'ruby'
+  create_makefile('stringio')
+else
+  File.write('Makefile', dummy_makefile("").join)
+end