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Date: Thu, 30 Jun 2016 10:05:27 -0400
From: Marvin Greenberg <public DOT marvin AT gmail DOT com>
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To: cygwin AT cygwin DOT com
Subject: Change in behavior (bug) in ctypes
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Code like this was working until sometime recently,

$ python
 >>> import ctypes
 >>> cygdll = ctypes.cdll.cygwin1

But with the latest cygwin update, it is failing.  On a couple older 
machines, I do:


$ python -c "import ctypes; print ctypes._dlopen('cygwin1')"; cygcheck 
-V; python -V
6442713088
cygcheck (cygwin) 2.1.0
System Checker for Cygwin ...<snip>
Python 2.7.10

$  python -c "import ctypes; print ctypes._dlopen('cygwin1')"; cygcheck 
-V; python -V
6442713088
cygcheck (cygwin) 2.5.1
System Checker for Cygwin ...<snip>
Python 2.7.10

This last was on a windows 8.1 (Windows 8.1 Enterprise Ver 6.3 Build 
9600) system.  I updated cygwin completely on that system to cygwin 
latest from a mirror.  And, then

$  python -c "import ctypes; print ctypes._dlopen('cygwin1')"; cygcheck 
-V; python -V
Traceback (most recent call last):
   File "<string>", line 1, in <module>
OSError: No such file or directory
cygcheck (cygwin) 2.5.2
System Checker for Cygwin  ...<snip>
Python 2.7.10

Note that simply changing the call to explicitly append the dll 
extension works fine:

$  python -c "import ctypes; print ctypes._dlopen('cygwin1.dll')"
6442713088

But that won't work with the former attribute-style of loading the dll.

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