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Date: Fri, 15 Nov 2019 07:55:30 +0000 (GMT Standard Time)
From: Arthur Norman <acn1 AT cam DOT ac DOT uk>
To: Brian Inglis <Brian DOT Inglis AT SystematicSw DOT ab DOT ca>
cc: cygwin AT cygwin DOT com
Subject: Re: linker fails with multiple definitions after inline thread_local var within class
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> You appear to be running into a conflict with Cygwin managing Windows TLS, as
> Cygwin does its own messing around to support Unix/Linux/POSIX/g++ semantics for
> TLS and everything else under Windows. You should either use the supplied API,
> or write a Windows program that allows you to control TLS within Windows rules
> on what you can do with it. Otherwise you will have to get deep into the
> changeable and not directly supported underbelly of the Cygwin implementation.

Than you for the prompt response, but while the motivation for my example 
involved the Windows native TLS API the sample code that fails to link for 
me does not touch that at all and tried to be generic C++ code. Where it 
superficially appears that the cygwin TLS initialization code fails to 
pick up the "inline" attribute that I believe it should inherit from the 
fact that the TLS fields and methods that I use are inline and hence 
allowed to be defined/declared multiple times. So does my sample code that 
fails breach the C++ standard or is this a Cygwin limitation please? 
Arthur

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