https://git.ruby-lang.org/ruby.git/commit/?id=1289721892

From 128972189284f4338722e8a910d0b4f6e7a02b31 Mon Sep 17 00:00:00 2001
From: Peter Zhu <peter@p...>
Date: Tue, 1 Mar 2022 13:38:48 -0500
Subject: Wrap ruby_abi_version in `extern "C"` for C++

Make ruby_abi_version have C linkage so that the symbol can be found
in the shared object.
---
 include/ruby/internal/abi.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/ruby/internal/abi.h b/include/ruby/internal/abi.h
index 81899dcd31..7a6caa6e2e 100644
--- a/include/ruby/internal/abi.h
+++ b/include/ruby/internal/abi.h
@@ -32,12 +32,20 @@ https://github.com/ruby/ruby/blob/trunk/include/ruby/internal/abi.h#L32
 
 #ifdef RUBY_DLN_CHECK_ABI
 
+# ifdef __cplusplus
+extern "C" {
+# endif
+
 RUBY_FUNC_EXPORTED unsigned long long __attribute__((weak))
 ruby_abi_version(void)
 {
     return RUBY_ABI_VERSION;
 }
 
+# ifdef __cplusplus
+}
+# endif
+
 #endif
 
 #endif
-- 
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