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From:	Jon Turney <jon DOT turney AT dronecode DOT org DOT uk>
Subject:	Re: cmake install; required cyglz4-1.dll not installed in /usr/bin or anywhere else
To:	The Cygwin Mailing List <cygwin AT cygwin DOT com>
Cc:	Brian DOT Inglis AT SystematicSw DOT ab DOT ca
References:	<636587926 DOT 1255909 DOT 1513705410399 DOT ref AT mail DOT yahoo DOT com> <636587926 DOT 1255909 DOT 1513705410399 AT mail DOT yahoo DOT com> <bb4102ea-6048-6b4a-a9bd-c4ab870896e1 AT SystematicSw DOT ab DOT ca>
Message-ID:	<320c8360-48ba-d0f8-970e-c875eddf4353@dronecode.org.uk>
Date:	Wed, 20 Dec 2017 14:07:55 +0000
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In-Reply-To:	<bb4102ea-6048-6b4a-a9bd-c4ab870896e1@SystematicSw.ab.ca>

On 19/12/2017 18:35, Brian Inglis wrote:
> On 2017-12-19 10:43, Vijaya Subramanian via cygwin wrote:
>> I checked /var/log/setup-full.log and found the below instances where libz4-1 was mentioned
>> package liblz4-devel comparing versions 131-1 and 131-1, result was 0
>> package liblz4_1 comparing versions 131-1 and 131-1, result was 0
>> package liblz4-devel comparing versions 1.7.5-1 and 131-1, result was -1
>> package liblz4_1 comparing versions 1.7.5-1 and 131-1, result was -1
>> 2017/12/02 14:06:47 Adding required dependency liblz4_1: Selecting already-installed version .
>> 2017/12/02 14:06:47 Changing gid back to original
>> So I am not sure why I get the following message when I run cmake:
>> When I try to run cmake, I get the following error message:
>> C:/cygwin64/bin/cmake.exe: error while loading shared libraries: ?:
>> cannot open shared object file: No such file or directory
>> or why cygcheck cmake says: cygcheck: track_down: could not find cyglz4-1.dll
> 
> Cygwin setup currently has problems upgrading when version numbers change
> formats and a solution is being addressed by the volunteer maintainers.
> 
> You have to manually run Cygwin setup, find the liblz4 packages you have
> installed, and select the new version number to be installed 1.7.5-1.

Of itself, this is not an explanation for a missing cyglz4-1.dll, as it 
is contained in both versions of the package (even if the package 
version has changed, the soversion doesn't change) (compare the package 
contents seen at [1])

[1] https://cygwin.com/packages/x86_64/liblz4_1/

setup thinks liblz4_1 is already installed, so doesn't install it again.

 >> 2017/12/02 14:06:47 Adding required dependency liblz4_1: Selecting 
already-installed version .

This is weird, since it seems to indicate that PrereqChecker::isMet() 
noted it as needing to be installed, but that 
PrereqChecker::selectMissing() thinks it is already installed.

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