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Date:	Mon, 8 Aug 2016 21:05:29 +0000 (UTC)
From:	Brent <yhbrent AT yahoo DOT com>
Reply-To:	Brent <yhbrent AT yahoo DOT com>
To:	"cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Message-ID:	<713977349.11020508.1470690330004.JavaMail.yahoo@mail.yahoo.com>
Subject:	RE: Postinstall script errors on cygwin x86 install
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References:	<713977349 DOT 11020508 DOT 1470690330004 DOT JavaMail DOT yahoo DOT ref AT mail DOT yahoo DOT com>

Hello,

Tatsuro MATSUOKA started this thread
    https://cygwin.com/ml/cygwin/2016-04/msg00193.html
back on Mon, 11 Apr 2016 05:18:30 +0900 (JST), which I stumbled across just now from a web search.

I recently encountered a very similar problem, and I think that I have a simple solution, so I wanted to followup.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

First some background:

--I was forced at work to downgrade from Win 7 to Win 10 spyware as a service a few weeks ago

--at the time of that downgrade, I had some problems with cygwin, so I did a clean install of 32 bit cygwin

--I vaguely recall a few post installation warnings at that time, but I did not note them; furthermore, cygwin seemed to subsequently work

--this morning, however, some R code failed that worked just 2 days ago (and was not changed in the interim...)
    --actually, it was the R C++ compiler of some critical methods that was failing, not R per se
    --the warning message was:
        Warning: running command 'C:/PROGRA~1/RRO/R-31~1.2/bin/x64/R CMD SHLIB file9d81bb03ccf.cpp 2> file9d81bb03ccf.cpp.err.txt' had status 1
              0 [main] make (1584) c:\Rtools\bin\make.exe: *** fatal error - cygheap base mismatch detected - 0xFCF408/0xDDF408.
        This problem is probably due to using incompatible versions of the cygwin DLL.
        Search for cygwin1.dll using the Windows Start->Find/Search facility
        and delete all but the most recent version.  The most recent version *should*
        reside in x:\cygwin\bin, where 'x' is the drive on which you have
        installed the cygwin distribution.  Rebooting is also suggested if you
        are unable to find another cygwin DLL.
              0 [main] make 2544 fork: child -1 - forked process 1584 died unexpectedly, retry 0, exit code 0xC0000142, errno 11

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

After that error, I tried another clean reinstall of 32 bit cygwin.  My steps were simply:
    1) I deleted these entire directory trees:
        C:\cygwin
        <path to setup-x86.exe>\http%3a%2f%2fcygwin.mirror.constant.com%2f
    2) I reran setup-x86.exe

At the end of this reinstall, setup-x86.exe popped up a dialog that listed these post install errors:
    Package: 0/Perpetual
        0p_000_autorebase.dash exit code 2
        0p_update-info-dir.dash exit code 2
    Package: _/base-cygwin
        000-cygwin-post-install.sh exit code 254
    Package: _/coreutils
        coreutils.sh exit code 254
    Package: _/bash
        bash.sh exit code 254
    Package: _/base-files
        base-files-mketc.sh exit code 254
        base-files-profile.sh exit code 254
    Package: _/ca-certificates
        ca-certificates.sh exit code 254
    Package: _/lynx
        lynx.sh exit code 254
    Package: _/man-db
        man-db.sh exit code 254
    Package: _/mintty
        mintty.sh exit code 254

That list is very similar to Tatsuro's.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

To make a long story short, the cure for my post install errors was to do another clean install that included CLEANING THE REGISTRY AS WELL.

In particular, these are the exact reinstall steps that worked for me:
    1) delete these entire directory trees:
        C:\cygwin
        <path to setup-x86.exe>\http%3a%2f%2fcygwin.mirror.constant.com%2f
    2) run regedit and ENTIRELY delete BOTH of these registry trees:
        HKEY_LOCAL_MACHINE\Software\Cygwin
        HKEY_CURRENT_USER\Software\Cygwin
    3) restart your computer
    4) rerun setup-x86.exe


The above is an abbreviated version of the steps described in    https://cygwin.com/faq/faq.html#faq.setup.uninstall-all
(I did not need to do the other steps, since my installation had nothing fancy like cygwin services running.)

When I did the above, setup-x86.exe ran to completion with no errors whatsoever.  Furthermore my cygwin install seems to work fine (as does the R code failed this morning).

Hope this helps someone else in the future.

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