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X-HELO: calimero.vinschen.de
Date: Fri, 1 Aug 2014 20:17:14 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Cc: Ryan Johnson <ryan DOT johnson AT cs DOT utoronto DOT ca>
Subject: Re: Destructors not called for c++11 thread_local objects
Message-ID: <20140801181714.GI25860@calimero.vinschen.de>
Reply-To: cygwin AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com,	Ryan Johnson <ryan DOT johnson AT cs DOT utoronto DOT ca>
References: <53DBCF39 DOT 9050309 AT cs DOT utoronto DOT ca> <53DBD151 DOT 90308 AT cygwin DOT com>
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On Aug  1 13:41, Larry Hall (Cygwin) wrote:
> On 08/01/2014 01:32 PM, Ryan Johnson wrote:
> >Hi all,
> >
> >(Please CC me in replies, I'm not subscribed to the list)
> >
> >Question: is this a Cygwin bug, gcc bug, or somebody else's bug entirely?
> >
> >The following STC shows the problem:
> >
> >$ cat bug.cpp
> >#include <cstdio>
> >static thread_local struct X {
> >     int x;
> >     X() { puts("hi"); }
> >     ~X() { puts("bye!"); }
> >} x;
> >int main() { x.x =3D 0; }
> >
> >$ g++ -std=3Dgnu++11 -Wall -g bug.cpp && ./a
> >hi
> >
> >A quick inspection of the assembly code shows no call to __cxa_thread_at=
exit
> >in __tls_init, where the same code compiled on linux, with the same vers=
ion
> >of gcc, has it right. This is odd, because the function does seem to be
> >available in cygwin's libstdc++:
> >
> >$ nm /usr/lib/gcc/x86_64-pc-cygwin/4.8.3/libstdc++.a | grep thread_atexit
> >0000000000000000 d .data$_ZZ19__cxa_thread_atexitE4once
> >0000000000000000 p .pdata$__cxa_thread_atexit
> >0000000000000000 t .text$__cxa_thread_atexit
> >0000000000000000 r .xdata$__cxa_thread_atexit
> >0000000000000000 T __cxa_thread_atexit
> >0000000000000000 d _ZZ19__cxa_thread_atexitE4once
> >[...]
>=20
> Well it's not a general gcc problem because the same code on Linux with
> version 4.8.3 works for me.

It seems thread_local storage needs to be implemented in GCC for the
target, and it isn't.


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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