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Subject: Re: emacs-w32 not starting - missing dependency?
To: cygwin AT cygwin DOT com
References: <966a14c2-ee69-7d3d-800e-a4f9f62a3ec9 AT gmail DOT com> <b3b9e712-32d1-59ca-d549-9b461865a6a6 AT cornell DOT edu> <f9f0713e-b151-6716-e5ee-6225716d595e AT cornell DOT edu> <dc6c9caf-5227-c64f-8c67-6b3b9c5c85e8 AT cornell DOT edu>
From: Ken Brown <kbrown AT cornell DOT edu>
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Date: Fri, 19 Aug 2016 16:43:41 -0400
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On 8/19/2016 4:03 PM, Ken Brown wrote:
> On 8/19/2016 11:22 AM, Ken Brown wrote:
>> On 8/19/2016 9:55 AM, Ken Brown wrote:
>>> On 8/19/2016 6:27 AM, Peter Hull wrote:
>>>> Hi all,
>>>>
>>>> When I type 'emacs' at the bash prompt, emacs does not start and the
>>>> prompt re-appears very quickly as if nothing happened. 'emacs -Q' and
>>>> 'emacs --version' do the same, nothing is printed.
>>>>
>>>> My alternatives are set such that emacs points to emacs-w32. I also
>>>> have
>>>> emacs-nox and that works fine.
>>>>
>>>> If I run 'strace emacs-w32' I get an error dialog:
>>>>
>>>> "The procedure entry point WebPDecode could not be located in the
>>>> dynamic link library C:\cygwin\bin\cygMagickCore-6.Q16-2.dll."
>>>
>>>> Is this a known problem? If not I can attach cygcheck.out and the
>>>> output
>>>> from strace if that will help.
>>>
>>> It's not a known problem.
>>
>> It is now.  I can reproduce the problem (only on 32-bit Cygwin).  I'll
>> look into it.
>
> The problem turns out to be related to the recent update of libgd3.
> Reverting to the previous version fixes it.
>
> Notice that cygMagickCore-6.Q16-2.dll, which occurs in the error dialog
> above, depends on cyggd-3.dll:
>
> $ cygcheck /usr/bin/cygMagickCore-6.Q16-2.dll | grep cyggd-3
>       C:\cygwin\bin\cyggd-3.dll
>
> Marco, is it possible that the libgd3 update requires a rebuild of
> ImageMagick?

Here's some further info:

objdump -p /usr/bin/cygMagickCore-6.Q16-2.dll
[...]
         DLL Name: cyggd-3.dll
         vma:  Hint/Ord Member-Name Bound-To
         48ee2c      8  WebPDecode
[...]

I assume this means that ImageMagick expects to find WebPDecode in 
cyggd-3.dll.  And it was indeed there in the previous version of libgd3:

$ objdump -p /usr/bin/cyggd-3.dll | grep WebPDecode
         [   8] WebPDecode

With the current libgd3, however, we get

$ objdump -p /usr/bin/cyggd-3.dll
[...]
         DLL Name: cygwebp-5.dll
         vma:  Hint/Ord Member-Name Bound-To
         5c0b4     272  WebPDecodeARGB
[...]

and there is no other occurrence of the string WebPDecode in the output.

Ken

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