https://git.ruby-lang.org/ruby.git/commit/?id=be1382b498

From be1382b498e05a806f1db52629a54046a2e558d0 Mon Sep 17 00:00:00 2001
From: Yuta Saito <kateinoigakukun@g...>
Date: Mon, 6 Dec 2021 11:25:44 +0900
Subject: ruby.c: initialize extra optional extensions linked statically

Add a hook point to initialize extra extension libraries. The default
hook function is replaced when linking a strong `Init_extra_exts`
symbol. A builder can insert an object file that defines Init_extra_exts
by XLDFLAGS.
---
 ruby.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/ruby.c b/ruby.c
index b3005260174..ade434cff3d 100644
--- a/ruby.c
+++ b/ruby.c
@@ -1524,6 +1524,15 @@ ruby_init_prelude(void) https://github.com/ruby/ruby/blob/trunk/ruby.c#L1524
 
 void rb_call_builtin_inits(void);
 
+// Initialize extra optional exts linked statically.
+// This empty definition will be replaced with the actual strong symbol by linker.
+#if RBIMPL_HAS_ATTRIBUTE(weak)
+__attribute__((weak))
+#endif
+void Init_extra_exts(void)
+{
+}
+
 static void
 ruby_opt_init(ruby_cmdline_options_t *opt)
 {
@@ -1542,6 +1551,7 @@ ruby_opt_init(ruby_cmdline_options_t *opt) https://github.com/ruby/ruby/blob/trunk/ruby.c#L1551
     rb_warning_category_update(opt->warn.mask, opt->warn.set);
 
     Init_ext(); /* load statically linked extensions before rubygems */
+    Init_extra_exts();
     rb_call_builtin_inits();
     ruby_init_prelude();
 
-- 
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