https://git.ruby-lang.org/ruby.git/commit/?id=c8b3bd45cc

From c8b3bd45cc3cae93ae701333202416838ee6a00c Mon Sep 17 00:00:00 2001
From: Peter Zhu <peter@p...>
Date: Thu, 7 Jul 2022 09:32:43 -0400
Subject: Fix extconf.rb for OpenSSL 3 without $warnflags

On Windows with OpenSSL 3, the gem fails to compile with the following
error message:

  ruby/src/ext/openssl/extconf.rb:188: undefined method \`sub!' for nil:NilClass

This is because $warnflags is nil.
---
 ext/openssl/extconf.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ext/openssl/extconf.rb b/ext/openssl/extconf.rb
index 467f7e7a86..26abfc8b2a 100644
--- a/ext/openssl/extconf.rb
+++ b/ext/openssl/extconf.rb
@@ -185,7 +185,7 @@ have_func("EVP_PKEY_dup") https://github.com/ruby/ruby/blob/trunk/ext/openssl/extconf.rb#L185
 Logging::message "=== Checking done. ===\n"
 
 if openssl_3
-  if $warnflags.sub!(/-W\K(?=deprecated-declarations)/, 'no-')
+  if $warnflags&.sub!(/-W\K(?=deprecated-declarations)/, 'no-')
     $warnflags << " -Wno-incompatible-pointer-types-discards-qualifiers"
   end
 end
-- 
cgit v1.2.1


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