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Date: Tue, 29 Sep 2009 12:08:52 +1000
From: Chris Cormie <cjcormie AT gmail DOT com>
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Subject: Re: Installing 1.7 alongside 1.5 - can it be done safely?
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David Antliff wrote:
 > I have found some serious issues with Cygwin 1.5 that I want to test
 > against in the 1.7 beta, before I commit to abandoning 1.5.
 >
 > Is it possible to install Cygwin 1.7 on the same PC/filesystem as
 > Cygwin 1.5, yet maintain absolute independence between the two
 > versions?
 >
 > I don't want the 1.7 install to change anything in my existing 1.5
 > install, as I need my 1.5 functional for other purposes.
 >
 > Is it a simple matter of installing to a different path (e.g.
 > c:\cygwin1.7), or will the 1.7 install overwrite anything (e.g.
 > environment variables, registry entries) that 1.5 might require?
 >
 > -- David.
 >
 > --
 > Problem reports:       http://cygwin.com/problems.html
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 >
 >
 From http://www.cygwin.com/:
QUOTE
Cygwin release 1.7 in BETA testing
...
Due to internal changes it is possible to install a 1.7 release in 
parallel to a 1.5 release and even run 1.7 processes in parallel to 1.5 
processes. The processes will not know about each other! Any try to 
interact between 1.7-based and 1.5-based processes will lead to, at 
least, funny results.

To install a 1.7 release in parallel to a 1.5 release, all you have to 
do is to choose another root directory (for instance: C:\cygwin-1.7) in 
setup-1.7's "Choose Installation Directory" dialog.

NOTE: Due to the way setup-1.7 works, you have to change the directory 
right the first time you visit this dialog! If you pressed the "Next" 
button and then "Back" again, it's already too late and setup-1.7 will 
create a broken 1.7 install. If you pressed "Next" by mistake, exit 
setup-1.7 and start it again.
ENDQUOTE

I followed this sage advice and so far my parallel 1.5 / 1.7 installs 
are not interfering with each other.

Chris














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