https://git.ruby-lang.org/ruby.git/commit/?id=e2aac6a611

From e2aac6a611f4924e4bed2a38e063d65c731aa33a Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Thu, 19 Sep 2019 12:25:34 +0900
Subject: Separate @have_devel for C++


diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index ce72668..e671ac9 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -2792,6 +2792,14 @@ realclean: distclean https://github.com/ruby/ruby/blob/trunk/lib/mkmf.rb#L2792
 
     CONFTEST_CXX = "#{CONFTEST}.#{config_string('CXX_EXT') || CXX_EXT[0]}"
 
+    def have_devel?
+      unless defined? @have_devel
+        @have_devel = true
+        @have_devel = try_link(MAIN_DOES_NOTHING)
+      end
+      @have_devel
+    end
+
     def conftest_source
       CONFTEST_CXX
     end
-- 
cgit v0.10.2


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