merge revision(s) 49482,49487: [Backport #10821]

	* lib/mkmf.rb (try_cppflags, try_cflags, try_ldflags): get rid of
	  interference by modifying global variables in have_devel? method.
	  [ruby-core:67962] [Bug #10821]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@49581 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

2 files changed, 32 insertions, 1 deletions

diff --git a/test/mkmf/base.rb b/test/mkmf/base.rb
index ab1a0f04b7..ea6a9d80f4 100644
--- a/test/mkmf/base.rb
+++ b/test/mkmf/base.rb
@@ -49,7 +49,9 @@ class TestMkmf < Test::Unit::TestCase
       @buffer << s if @out
     end
   end
+end
 
+module TestMkmf::Base
   attr_reader :stdout
 
   def mkmflog(msg)
@@ -84,7 +86,7 @@ class TestMkmf < Test::Unit::TestCase
     @tmpdir = Dir.mktmpdir
     @curdir = Dir.pwd
     @mkmfobj = Object.new
-    @stdout = Capture.new
+    @stdout = TestMkmf::Capture.new
     Dir.chdir(@tmpdir)
     @quiet, Logging.quiet = Logging.quiet, true
     init_mkmf
@@ -127,3 +129,11 @@ class TestMkmf < Test::Unit::TestCase
     nil
   end
 end
+
+class TestMkmf
+  include TestMkmf::Base
+
+  def assert_separately(args, src, *rest)
+    super(args + ["-r#{__FILE__}"], "extend TestMkmf::Base; setup\n#{src}", *rest)
+  end
+end
diff --git a/test/mkmf/test_flags.rb b/test/mkmf/test_flags.rb
index 3bb278071a..e49d474dc9 100644
--- a/test/mkmf/test_flags.rb
+++ b/test/mkmf/test_flags.rb
@@ -31,5 +31,26 @@ class TestMkmf
       $warnflags = warnflags
       $extmk = val
     end
+
+    def test_try_ldflag_invalid_opt
+      assert_separately([], <<-'end;') #do
+        assert(!try_ldflags("nosuch.c"), TestMkmf::MKMFLOG)
+        assert(have_devel?, TestMkmf::MKMFLOG)
+      end;
+    end
+
+    def test_try_cflag_invalid_opt
+      assert_separately([], <<-'end;') #do
+        assert(!try_cflags("nosuch.c"), TestMkmf::MKMFLOG)
+        assert(have_devel?, TestMkmf::MKMFLOG)
+      end;
+    end
+
+    def test_try_cppflag_invalid_opt
+      assert_separately([], <<-'end;') #do
+        assert(!try_cppflags("nosuch.c"), TestMkmf::MKMFLOG)
+        assert(have_devel?, TestMkmf::MKMFLOG)
+      end;
+    end
   end
 end