From 1c3088117a6b22b6aa07fb8c9c28028851786c1b Mon Sep 17 00:00:00 2001
From: Benoit Daloze <eregontp@gmail.com>
Date: Fri, 24 Nov 2023 13:14:56 +0100
Subject: [PATCH] [ruby/stringio] 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

https://github.com/ruby/stringio/commit/d791b63df6
---
 ext/stringio/extconf.rb | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/ext/stringio/extconf.rb b/ext/stringio/extconf.rb
index ad8650dce2..553732f79c 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