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Subject: Re: Piping on 64-bit Cygwin was Re: [ANNOUNCEMENT] llvm 3.7.1-2
From: Warren Young <wyml AT etr-usa DOT com>
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Date: Tue, 21 Jun 2016 15:57:47 -0600
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On Jun 20, 2016, at 10:53 PM, lloyd DOT wood AT yahoo DOT co DOT uk wrote:
> 
> Yes, it's the same piping problem of three years ago.

…where you were asked to provide a simple test case for the problem, instead of “compile admittedly difficult-to-build package Geomview and use it against one of the most complicated packages in Cygwin, OpenGL.”

Here’s what a simple test case looks like:

  $ dd if=/dev/urandom bs=4k count=4m | 
    gpg -c --force-mdc | 
    gpg -d > /dev/null

Type the same passphrase three times: twice to verify it for encryption, and once for decryption.  The fact that this runs without errors proves that Cygwin 64 is capable of reliably transporting 16 GiB of data through a pipe without corruption.  

Try it on your system.  If it gives an error, it shows that the problem is system-specific, and thus possibly BLODA or some other platform issue.

If not, then please explain how your problem differs from the demonstration here.

Have you ruled out Cygwin’s OpenGL package, such as by running it over X11 to a remote system running a different implementation?
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