https://git.ruby-lang.org/ruby.git/commit/?id=30886be9f4

From 30886be9f4f42626b94b079885e826335594b8dd Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Thu, 4 Nov 2021 13:36:35 +0900
Subject: Skip bundled gem with an extension library under
 with-static-linked-ext

.. mainly to fix emscripten CI

http://rubyci.s3.amazonaws.com/crossruby/crossruby-master-wasm64_emscripten/log/20211104T024621Z.fail.html.gz
---
 tool/rbinstall.rb | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tool/rbinstall.rb b/tool/rbinstall.rb
index 170a1707d0b..0f86850db7c 100755
--- a/tool/rbinstall.rb
+++ b/tool/rbinstall.rb
@@ -1039,6 +1039,10 @@ install?(:ext, :comm, :gem, :'bundled-gems') do https://github.com/ruby/ruby/blob/trunk/tool/rbinstall.rb#L1039
     end
     next unless spec.platform == Gem::Platform::RUBY
     next unless spec.full_name == gem_name
+    if !spec.extensions.empty? && CONFIG["EXTSTATIC"] == "static"
+      puts "skip installation of #{spec.name} #{spec.version}; bundled gem with an extension library is not supported on --with-static-linked-ext"
+      next
+    end
     spec.extension_dir = "#{extensions_dir}/#{spec.full_name}"
     if File.directory?(ext = "#{gem_ext_dir}/#{spec.full_name}")
       spec.extensions[0] ||= "-"
-- 
cgit v1.2.1


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