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From: John J Ottusch <ncokwqc02 AT sneakemail DOT com>
Subject: gnuplot 5.x.x.x not starting correctly in 64-bit CYGWIN console
Date: Mon, 16 Nov 2015 21:26:24 +0000 (UTC)
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I think this problem is related to the fact that I have both 32-bit and
64-bit versions of CYGWIN installed on my Windows 7 PC. They are on the 
same disk but in different directories (/cygdrive/c/win32app/cygwin vs. 
/cygdrive/c/win64app/cygwin).

So far I have observed the problem only when I try to run the version of 
gnuplot that comes with the most recent 64-bit CYGWIN installation. I 
believe gnuplot v4.x.x.x had been working in 64-bit CYGWIN before I 
updated.

I always run gnuplot from an X11 or rxvt console window within the 
CYGWIN environment. I'm using v4.4.4 with my 32 bit CYGWIN installation 
without any problems. 

I just updated my 64 bit CYGWIN installation in order to try out gnuplot 
v5.x.x. I didn't load absolutely everything, but I did accept all 
automatic dependencies. Installation went smoothly and all seems to work 
fine except for gnuplot.

Observations:

1) When I type gnuplot into a 64-bit console window it returns 
immediately to my prompt with no visible message instead of entering 
interactive mode. 

In this case my PATH is
/usr/local/bin:/usr/bin:/cygdrive/c/Windows/system32:/cygdrive/c/win32ap
p/cygwin/bin

2) However, doing the above with /cygdrive/c/win32app/cygwin/bin removed 
from my PATH (or replaced by /cygdrive/c/win64app/cygwin/bin) produces 
this error message:

C:/win64app/cygwin/bin/gnuplot.exe: error while loading shared 
libraries: ?: cannot open shared object file: No such file or directory

So something in /cygdrive/c/win32app/cygwin/bin is making a difference. 
Hard for me to tell from the error message which shared library it is 
looking for.

3) I wouldn't necessarily expect it to work correctly if I try to start 
gnuplot.exe directly from the filename in Windows Explorer, but at least 
I get an error message -- "The application was unable to start correctly 
(0xc000007b). 


Any suggestions on how to fix or debug the problem would be appreciated. 

John Ottusch

PS. I tried attaching the outputs from 'cygcheck -s -v -r' for cases 1 
and 2 but that message apparently got bounced somewhere along the line.


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