From 031bc21abba4c2e9ce38bb49c456478073e6672a Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Mon, 19 Dec 2022 22:43:51 +0900
Subject: [PATCH] expand-config.rb: search revision.h to extract release date

---
 tool/expand-config.rb | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/tool/expand-config.rb b/tool/expand-config.rb
index 928e7f91fe..ac0ffbfd41 100755
--- a/tool/expand-config.rb
+++ b/tool/expand-config.rb
@@ -7,7 +7,17 @@ config.sub!(/^(\s*)RUBY_VERSION\b.*(\sor\s*)$/, '\1true\2')
 rbconfig = Module.new {module_eval(config, conffile)}::RbConfig
 config = $expand ? rbconfig::CONFIG : rbconfig::MAKEFILE_CONFIG
 config["RUBY_RELEASE_DATE"] ||=
-  File.read(File.expand_path("../../version.h", __FILE__))[/^\s*#\s*define\s+RUBY_RELEASE_DATE\s+"(.*)"/, 1]
+  [
+    ["revision.h"],
+    ["../../revision.h", __FILE__],
+    ["../../version.h", __FILE__],
+  ].find do |hdr, dir|
+  hdr = File.expand_path(hdr, dir) if dir
+  if date = File.read(hdr)[/^\s*#\s*define\s+RUBY_RELEASE_DATE(?:TIME)?\s+"([0-9-]*)/, 1]
+    break date
+  end
+rescue
+end
 
 while /\A(\w+)=(.*)/ =~ ARGV[0]
   config[$1] = $2