https://git.ruby-lang.org/ruby.git/commit/?id=c904844578

From c904844578745859e275fbcc79264ef737457f36 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Wed, 29 Jul 2020 00:31:28 +0900
Subject: Skip already extracted gems


diff --git a/common.mk b/common.mk
index ed6f2b1..cd30d4f 100644
--- a/common.mk
+++ b/common.mk
@@ -1311,7 +1311,8 @@ extract-gems$(gnumake:yes=-nongnumake): PHONY https://github.com/ruby/ruby/blob/trunk/common.mk#L1311
 	    -e 'BEGIN {FileUtils.mkdir_p(d = ".bundle/gems")}' \
 	    -e 'gem, ver = *$$F' \
 	    -e 'next if !ver or /^#/=~gem' \
-	    -e 'Gem.unpack("gems/#{gem}-#{ver}.gem", d)' \
+	    -e 'g = "#{gem}-#{ver}"' \
+	    -e 'File.directory?("#{d}/#{g}") or Gem.unpack("gems/#{g}.gem", d)' \
 	    gems/bundled_gems
 
 update-bundled_gems: PHONY
-- 
cgit v0.10.2


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