https://git.ruby-lang.org/ruby.git/commit/?id=fe3ff5afb0

From fe3ff5afb07e171fd950623c69abfbabbb2762a3 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Thu, 23 May 2019 17:27:24 +0900
Subject: Suppress paranoid warnings for external/3rd-party libraries

[Feature #15665]

diff --git a/ext/socket/mkconstants.rb b/ext/socket/mkconstants.rb
index 81b8224..620a5f6 100644
--- a/ext/socket/mkconstants.rb
+++ b/ext/socket/mkconstants.rb
@@ -180,6 +180,7 @@ int https://github.com/ruby/ruby/blob/trunk/ext/socket/mkconstants.rb#L180
 
 %    }
       default:
+        if (!str || !valp) {/* wrong argument */}
         return -1;
     }
 }
diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index 0c6d7e3..86e01f6 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -2198,6 +2198,7 @@ rb_array_ptr_use_start(VALUE a, int allow_transient) https://github.com/ruby/ruby/blob/trunk/include/ruby/ruby.h#L2198
         }
     }
 #endif
+    (void)allow_transient;
 
     return rb_ary_ptr_use_start(a);
 }
@@ -2208,6 +2209,7 @@ rb_array_ptr_use_end(VALUE a, int allow_transient) https://github.com/ruby/ruby/blob/trunk/include/ruby/ruby.h#L2209
 {
     void rb_ary_ptr_use_end(VALUE a);
     rb_ary_ptr_use_end(a);
+    (void)allow_transient;
 }
 
 #if defined(EXTLIB) && defined(USE_DLN_A_OUT)
diff --git a/internal.h b/internal.h
index 2511aff..bf57094 100644
--- a/internal.h
+++ b/internal.h
@@ -117,10 +117,10 @@ extern "C" { https://github.com/ruby/ruby/blob/trunk/internal.h#L117
 #endif
 
 #if !__has_feature(memory_sanitizer)
-# define __msan_allocated_memory(x, y)
-# define __msan_poison(x, y)
-# define __msan_unpoison(x, y)
-# define __msan_unpoison_string(x)
+# define __msan_allocated_memory(x, y) ((void)(x), (void)(y))
+# define __msan_poison(x, y) ((void)(x), (void)(y))
+# define __msan_unpoison(x, y) ((void)(x), (void)(y))
+# define __msan_unpoison_string(x) ((void)(x))
 #endif
 
 /*!
diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index ea5a8ac..bf95484 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -2735,7 +2735,7 @@ MESSAGE https://github.com/ruby/ruby/blob/trunk/lib/mkmf.rb#L2735
   ##
   # A C main function which does no work
 
-  MAIN_DOES_NOTHING = config_string('MAIN_DOES_NOTHING') || "int main(int argc, char **argv)\n{\n  return 0;\n}"
+  MAIN_DOES_NOTHING = config_string('MAIN_DOES_NOTHING') || "int main(int argc, char **argv)\n{\n  return !!argv[argc];\n}"
   UNIVERSAL_INTS = config_string('UNIVERSAL_INTS') {|s| Shellwords.shellwords(s)} ||
     %w[int short long long\ long]
 
-- 
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