Explicit ".dll" suffix

* ext/win32/lib/Win32API.rb (Win32API#initialize): Cygwin
  2.5.2-1 (perhaps) seems to no longer append ".dll" suffix
  implicitly.
* ext/win32/lib/win32/resolv.rb (Win32::Resolv): ditto.  Fix the
  error reported by yamataka AT u08.itscom.net in
  [ruby-list:50339], and pointed out and patched by cerberus AT
  m3.kcn.ne.jp in [ruby-list:50341].

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55507 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,14 @@
+Sun Jun 26 10:20:25 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* ext/win32/lib/Win32API.rb (Win32API#initialize): Cygwin
+	  2.5.2-1 (perhaps) seems to no longer append ".dll" suffix
+	  implicitly.
+
+	* ext/win32/lib/win32/resolv.rb (Win32::Resolv): ditto.  Fix the
+	  error reported by yamataka AT u08.itscom.net in
+	  [ruby-list:50339], and pointed out and patched by cerberus AT
+	  m3.kcn.ne.jp in [ruby-list:50341].
+
 Sat Jun 25 10:07:52 2016  Kazuki Yamaguchi  <k@rhe.jp>
 
 	* test/openssl/test_ocsp.rb: Ignore errors caused by bugs that exist in

ext/win32/lib/Win32API.rb

@@ -12,7 +12,13 @@ class Win32API
 
   def initialize(dllname, func, import, export = "0", calltype = :stdcall)
     @proto = [import].join.tr("VPpNnLlIi", "0SSI").sub(/^(.)0*$/, '\1')
-    handle = DLL[dllname] ||= Fiddle.dlopen(dllname)
+    handle = DLL[dllname] ||=
+             begin
+               Fiddle.dlopen(dllname)
+             rescue Fiddle::DLError
+               raise unless File.extname(dllname).empty?
+               Fiddle.dlopen(dllname + ".dll")
+             end
 
     @func = Fiddle::Function.new(
       handle[func],

ext/win32/lib/win32/resolv.rb

@@ -38,7 +38,7 @@ module Win32
 nt = Module.new do
   break true if [nil].pack("p").size > 4
   extend Importer
-  dlload "kernel32"
+  dlload "kernel32.dll"
   getv = extern "int GetVersionExA(void *)", :stdcall
   info = [ 148, 0, 0, 0, 0 ].pack('V5') + "\0" * 128
   getv.call(info)