https://git.ruby-lang.org/ruby.git/commit/?id=6180f1fede

From 6180f1fede487bf5dfdd00cbae2ee7f2b4613a7e Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Thu, 19 Sep 2019 19:06:18 +0900
Subject: Added link_command for C++


diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index e671ac9..eabccd4 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -2792,6 +2792,11 @@ realclean: distclean https://github.com/ruby/ruby/blob/trunk/lib/mkmf.rb#L2792
 
     CONFTEST_CXX = "#{CONFTEST}.#{config_string('CXX_EXT') || CXX_EXT[0]}"
 
+    TRY_LINK_CXX = config_string('TRY_LINK_CXX') ||
+                   ((cmd = TRY_LINK.gsub(/\$\(C(?:C|(FLAGS))\)/, '$(CXX\1)')) != TRY_LINK && cmd) ||
+                   "$(CXX) #{OUTFLAG}#{CONFTEST}#{$EXEEXT} $(INCFLAGS) $(CPPFLAGS) " \
+                   "$(CXXFLAGS) $(src) $(LIBPATH) $(LDFLAGS) $(ARCH_FLAG) $(LOCAL_LIBS) $(LIBS)"
+
     def have_devel?
       unless defined? @have_devel
         @have_devel = true
@@ -2809,6 +2814,11 @@ realclean: distclean https://github.com/ruby/ruby/blob/trunk/lib/mkmf.rb#L2814
       RbConfig::expand("$(CXX) #$INCFLAGS #$CPPFLAGS #$CXXFLAGS #$ARCH_FLAG #{opt} -c #{CONFTEST_CXX}",
                        conf)
     end
+
+    def link_command(ldflags, *opts)
+      conf = link_config(ldflags, *opts)
+      RbConfig::expand(TRY_LINK_CXX.dup, conf)
+    end
   end
 end
 
-- 
cgit v0.10.2


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