From 3333d0235723c8c201ad67ed20c6af22d7923765 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Sat, 9 May 2020 01:22:16 +0900
Subject: [PATCH] rbinstall.rb: get rid of installing duplicate files

Should not overwrite ext/rubyvm/lib/forwardable/impl.rb by
lib/forwardable/impl.rb.
---
 tool/rbinstall.rb | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tool/rbinstall.rb b/tool/rbinstall.rb
index 94718866e2..c91d4fff86 100755
--- a/tool/rbinstall.rb
+++ b/tool/rbinstall.rb
@@ -39,6 +39,7 @@ def parse_args(argv = ARGV)
   $make = 'make'
   $mflags = []
   $install = []
+  $installed = {}
   $installed_list = nil
   $exclude = []
   $dryrun = false
@@ -170,9 +171,12 @@ def install(src, dest, options = {})
   options = options.clone
   strip = options.delete(:strip)
   options[:preserve] = true
+  srcs = Array(src).select {|s| !$installed[$made_dirs[dest] ? File.join(dest, s) : dest]}
+  return if srcs.empty?
+  src = srcs if Array === src
   d = with_destdir(dest)
   super(src, d, **options)
-  srcs = Array(src)
+  srcs.each {|s| $installed[$made_dirs[dest] ? File.join(dest, s) : dest] = true}
   if strip
     d = srcs.map {|s| File.join(d, File.basename(s))} if $made_dirs[dest]
     strip_file(d)