Moved update-bundled_gems code to a tool

common.mk

@@ -1328,16 +1328,7 @@ extract-gems$(gnumake:yes=-nongnumake): PHONY
 
 update-bundled_gems: PHONY
 	$(Q) $(RUNRUBY) -rrubygems \
-	    -pla \
-	    -e 'unless /^[^#]/!~(gem=$$F[0])' \
-	    -e '(gem,src), = Gem::SpecFetcher.fetcher.detect(:latest) {'"|s|" \
-	    -e   's.platform=="ruby"&&s.name==gem' \
-	    -e '}' \
-	    -e 'gem = src.fetch_spec(gem)' \
-	    -e 'uri = gem.metadata["source_code_uri"]||gem.homepage' \
-	    -e 'uri = uri.sub(%r[\Ahttps://github\.com/[^/]+/[^/]+\K/tree/.*], "")' \
-	    -e '$$_ = [gem.name, gem.version, uri].join(" ")' \
-	    -e 'end' \
+	     $(tooldir)/update-bundled_gems.rb \
 	     "$(srcdir)/gems/bundled_gems" | \
 	"$(IFCHANGE)" "$(srcdir)/gems/bundled_gems" -
 

tool/update-bundled_gems.rb

@@ -0,0 +1,13 @@
+#!ruby -pla
+BEGIN {
+  require 'rubygems'
+}
+unless /^[^#]/ !~ (gem = $F[0])
+  (gem, src), = Gem::SpecFetcher.fetcher.detect(:latest) {|s|
+    s.platform == "ruby" && s.name == gem
+  }
+  gem = src.fetch_spec(gem)
+  uri = gem.metadata["source_code_uri"] || gem.homepage
+  uri = uri.sub(%r[\Ahttps://github\.com/[^/]+/[^/]+\K/tree/.*], "")
+  $_ = [gem.name, gem.version, uri].join(" ")
+end