From c3abbc1b2f52015dc839fd96545380dbc11c77a9 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Thu, 5 Dec 2019 16:18:22 +0900
Subject: ext/openssl/extconf.rb: check with -Werror=deprecated-declarations

This reverts commit 0d7d8b2989e1738dd902d354cc41186899e6b71e,
but restore `$warnflags` without the flag, to get rid of using
deprecated functions.
---
 ext/openssl/deprecation.rb | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

(limited to 'ext/openssl/deprecation.rb')

diff --git a/ext/openssl/deprecation.rb b/ext/openssl/deprecation.rb
index 6f08a206b4..afe989ead1 100644
--- a/ext/openssl/deprecation.rb
+++ b/ext/openssl/deprecation.rb
@@ -1,7 +1,23 @@
 # frozen_string_literal: false
 module OpenSSL
+  def self.deprecated_warning_flag
+    unless flag = (@deprecated_warning_flag ||= nil)
+      if try_compile("", flag = "-Werror=deprecated-declarations")
+        $warnflags = "#{@warnflags = $warnflags}" #{flag}"
+      else
+        flag = ""
+      end
+      @deprecated_warning_flag = flag
+    end
+    flag
+  end
+
+  def self.restore_warning_flag
+    $warnflags = @warnflags
+  end
+
   def self.check_func(func, header)
-    have_func(func, header)
+    have_func(func, header, deprecated_warning_flag)
   end
 
   def self.check_func_or_macro(func, header)
-- 
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