merge revision(s) 39958,39989: [Backport #8216]
* lib/mkmf.rb (MAIN_DOES_NOTHING): force to refer symbols for tests to be preserved. [ruby-core:53745] [Bug #8169] * lib/mkmf.rb (MAIN_DOES_NOTHING): ensure symbols for tests to be preserved. [ruby-core:53745] [Bug #8169]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@40715 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 39958,39989: [Backport #8216]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@40715 b2dd03c8-39d4-4d8f-98ff-823fe69b080e