https://git.ruby-lang.org/ruby.git/commit/?id=1c0e79e87b

From 1c0e79e87b202ac707833fb1bd5e9398c8d0b4fb Mon Sep 17 00:00:00 2001
From: Peter Zhu <peter@p...>
Date: Tue, 23 Feb 2021 16:29:53 -0500
Subject: Disable auto compaction on platforms that do not support it

---
 gc.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/gc.c b/gc.c
index 2a0fa80..d1a9174 100644
--- a/gc.c
+++ b/gc.c
@@ -9986,6 +9986,13 @@ gc_set_auto_compact(rb_execution_context_t *ec, VALUE _, VALUE v) https://github.com/ruby/ruby/blob/trunk/gc.c#L9986
         rb_raise(rb_eNotImpError, "Automatic compaction isn't available on this platform");
     }
 #endif
+
+    /* If not MinGW, Windows, or does not have mmap, we cannot use mprotect for
+     * the read barrier, so we must disable automatic compaction. */
+#if !defined(__MINGW32__) && !defined(_WIN32) && !defined(HAVE_MMAP)
+    rb_raise(rb_eNotImpError, "Automatic compaction isn't available on this platform");
+#endif
+
     ruby_enable_autocompact = RTEST(v);
     return v;
 }
-- 
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