mismatched dll

Larry Hall (Cygwin) reply-to-list-only-lh@cygwin.com
Sat Sep 23 04:14:00 GMT 2006

Bob Rossi wrote:
> On Thu, Feb 02, 2006 at 09:32:27PM +0000, Eric Blake wrote:
>>> By moving the cygwin1.dll in the executable directory, things begin to
>>> work. However, I don't understand how it's assumed that the new
>>> cygwin1.dll acts the same as the one the executable was linked against.
>>> See what I mean?
>> There's a difference here.  Cygwin does not maintain binary
>> compatibility of its use of its shared memory region between
>> versions.  But it DOES maintain binary compatibility of the API
>> it exposes.  Cygwin releases try very hard to guarantee that
>> something compiled against an older cygwin1.dll will continue
>> to run when a newer cygwin1.dll is put in its place.  The
>> underlying details may change (such as the shared memory
>> region), but the API continues to work.  And that is exactly
>> what shared libraries were invented for.
> Hi Eric,
> Well, I just updated Cygwin, and now my nx client doesn't work anymore.
> If I rename the cygwin cygwin1.dll and have nx use the cygwin1.dll it
> comes with, it works. However, when I have nx use the cygwin1.dll that
> cygwin uses, it doesn't work. What should I do now?
> I could post the error messages I get here, if that's useful.

I'd say that you're going to have to get at least a bit more specific
before someone can offer any real advice.  I've run an NX client on
my machine against cygwin packages 1.5.19 and 1.5.21 with no noticeable
problems.  I've run version 1.5.0-106 of the NX client on both of the
above.  I've run the current 2.0.0-98 against 1.5.21.  But be sure you
remove all duplicate DLLs from the bin directory.  I found the following
DLLs were duplicates with my installation:


Really, it would be better to install, via 'setup.exe', all the packages
that contain the 'cyg*.dll's delivered with the NX client and then delete
all of these from the installation.  That's more maintainable.  But how you
handle it is up to you.


Larry Hall                              http://www.rfk.com
RFK Partners, Inc.                      (508) 893-9779 - RFK Office
216 Dalton Rd.                          (508) 893-9889 - FAX
Holliston, MA 01746

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