From fc624020e6ac13427e61d97a8e63b68f73073939 Mon Sep 17 00:00:00 2001
From: Ryan Davis <ryand-ruby@zenspider.com>
Date: Tue, 26 Aug 2025 13:33:33 +0100
Subject: [PATCH] Rakefile: make the whole thing parallel unless SERIAL=1

Goes from 36s to 16s on my system (from clean):
```
$ 2>&1 time -p rake -m       | rg real
real 14.72
$ 2>&1 time -p rake          | rg real
real 14.72
$ 2>&1 time -p rake SERIAL=1 | rg real
real 37.49
```
---
 Rakefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Rakefile b/Rakefile
index 79ec84f67..4422f9688 100644
--- a/Rakefile
+++ b/Rakefile
@@ -4,6 +4,7 @@ MRUBY_ROOT = File.dirname(File.expand_path(__FILE__))
 MRUBY_BUILD_HOST_IS_CYGWIN = RUBY_PLATFORM.include?('cygwin')
 MRUBY_BUILD_HOST_IS_OPENBSD = RUBY_PLATFORM.include?('openbsd')
 
+Rake.application.options.always_multitask = true unless ENV["SERIAL"]
 Rake.verbose(false) if Rake.verbose == Rake::DSL::DEFAULT
 
 $LOAD_PATH << File.join(MRUBY_ROOT, "lib")