From 300927b4bb1b41e9e848c063f2ca6109423a1729 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Tue, 20 Jan 2026 18:37:24 +0900
Subject: [PATCH] [Bug #21845] Rebuild gem extensions at RUBY_ABI_VERSION
 change

As `TARGET_SO_DIR_TIMESTAMP` contains `ruby_version`, after bumping
`RUBY_ABI_VERSION` it should not be existing.  Usually such outdated
files will be removed by `make outdate-bundled-gems` automatically
invoked by `make up`.
---
 ext/extmk.rb | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ext/extmk.rb b/ext/extmk.rb
index 8f847f4f3a..578e1cfa01 100755
--- a/ext/extmk.rb
+++ b/ext/extmk.rb
@@ -592,6 +592,7 @@ gem = #{@gemname}
 build_complete = $(TARGET_GEM_DIR)/gem.build_complete
 install-so: build_complete
 clean-so:: clean-build_complete
+$(build_complete) $(OBJS): $(TARGET_SO_DIR_TIMESTAMP)
 
 build_complete: $(build_complete)
 $(build_complete): $(TARGET_SO)