https://git.ruby-lang.org/ruby.git/commit/?id=9d5beb6fde

From 9d5beb6fde45c8182d8dc6b8baade2fa5a6f4e07 Mon Sep 17 00:00:00 2001
From: Aaron Patterson <tenderlove@r...>
Date: Wed, 8 Sep 2021 09:47:00 -0700
Subject: Disable YJIT by default if MJIT_FORCE_ENABLE is on

Compile time flag seems pretty forceful, so let MJIT turn on by default
if it is used.
---
 ruby.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/ruby.c b/ruby.c
index bf161f6df7..22cfeace1e 100644
--- a/ruby.c
+++ b/ruby.c
@@ -233,8 +233,9 @@ cmdline_options_init(ruby_cmdline_options_t *opt) https://github.com/ruby/ruby/blob/trunk/ruby.c#L233
     opt->features.set = DEFAULT_FEATURES;
 #ifdef MJIT_FORCE_ENABLE /* to use with: ./configure cppflags="-DMJIT_FORCE_ENABLE" */
     opt->features.set |= FEATURE_BIT(jit);
-#endif
+#else
     opt->features.set |= FEATURE_BIT(yjit);
+#endif
     return opt;
 }
 
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