merge revision(s) 790cf4b6d0475614afb127b416e87cfa39044d67: [Backport #19115]

	Fix autoload status of statically linked extensions

	Previously, for statically-linked extensions, we used
	`vm->loading_table` to delay calling the init function until the
	extensions are required. This caused the extensions to look like they
	are in the middle of being loaded even before they're required.
	(`rb_feature_p()` returned true with a loading path output.) Combined
	with autoload, queries like `defined?(CONST)` and `Module#autoload?`
	were confused by this and returned nil incorrectly. RubyGems uses
	`defined?` to detect if OpenSSL is available and failed when OpenSSL was
	available in builds using `--with-static-linked-ext`.

	Use a dedicated table for the init functions instead of adding them to
	the loading table. This lets us remove some logic from non-EXTSTATIC
	builds.

	[Bug #19115]
	---
	 load.c                     | 55 +++++++++++++++++++++++++++++++++++-----------
	 test/ruby/test_autoload.rb | 18 +++++++++++++++
	 vm.c                       |  3 +++
	 vm_core.h                  |  9 ++++++++
	 4 files changed, 72 insertions(+), 13 deletions(-)

1 files changed, 18 insertions, 0 deletions

diff --git a/test/ruby/test_autoload.rb b/test/ruby/test_autoload.rb
index 7709760d19..7010645317 100644
--- a/test/ruby/test_autoload.rb
+++ b/test/ruby/test_autoload.rb
@@ -65,6 +65,24 @@ p Foo::Bar
     }
   end
 
+  def test_autoload_p_with_static_extensions
+    require 'rbconfig'
+    omit unless RbConfig::CONFIG['EXTSTATIC'] == 'static'
+    begin
+      require 'fcntl.so'
+    rescue LoadError
+      omit('fcntl not included in the build')
+    end
+
+    assert_separately(['--disable-all'], <<~RUBY)
+      autoload :Fcntl, 'fcntl.so'
+
+      assert_equal('fcntl.so', autoload?(:Fcntl))
+      assert(Object.const_defined?(:Fcntl))
+      assert_equal('constant', defined?(Fcntl), '[Bug #19115]')
+    RUBY
+  end
+
   def test_autoload_with_unqualified_file_name # [ruby-core:69206]
     Object.send(:remove_const, :A) if Object.const_defined?(:A)