https://git.ruby-lang.org/ruby.git/commit/?id=d3c9e31104

From d3c9e31104ab60177c9b4f97e8a0a393f41ad70c Mon Sep 17 00:00:00 2001
From: Alan Wu <XrXr@u...>
Date: Tue, 16 Feb 2021 16:50:09 -0500
Subject: Fix empty struct

---
 ujit_iface.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/ujit_iface.c b/ujit_iface.c
index 2a6f4fea90..675cadd798 100644
--- a/ujit_iface.c
+++ b/ujit_iface.c
@@ -127,7 +127,9 @@ cfunc_needs_frame(const rb_method_cfunc_t *cfunc) https://github.com/ruby/ruby/blob/trunk/ujit_iface.c#L127
 }
 
 // GC root for interacting with the GC
-struct ujit_root_struct {};
+struct ujit_root_struct {
+    int unused; // empty structs are not legal in C99
+};
 
 // Map cme_or_cc => [[iseq, offset]]. An entry in the map means compiled code at iseq[offset]
 // is only valid when cme_or_cc is valid
-- 
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