lite.rb in mkmf-lite-0.7.1

- old
+ new

@@ -14,18 +14,24 @@
   # Mkmf module in the standard library.
   module Lite
     extend Memoist
 
     # The version of the mkmf-lite library
-    MKMF_LITE_VERSION = '0.7.0'
+    MKMF_LITE_VERSION = '0.7.1'
 
     private
 
     def cpp_defs
       RbConfig::CONFIG['DEFS']
     end
 
+    def jruby?
+      defined?(JRUBY_VERSION) ? true : false
+    end
+
+    memoize :jruby?
+
     # rubocop:disable Layout/LineLength
     def cpp_command
       command = RbConfig::CONFIG['CC'] || RbConfig::CONFIG['CPP'] || File.which('cc') || File.which('gcc') || File.which('cl')
       raise 'Compiler not found' unless command
       command
@@ -48,9 +54,10 @@
 
     memoize :cpp_out_file
 
     def cpp_libraries
       return if File::ALT_SEPARATOR && RbConfig::CONFIG['CPP'] =~ /^cl/
+      return if jruby?
 
       if cpp_command =~ /clang/i
         '-Lrt -Ldl -Lcrypt -Lm'
       else
         '-lrt -ldl -lcrypt -lm'