Date: Wed, 26 Jun 2013 23:11:34 +0200 From: Dimitry Andric <dim@FreeBSD.org> To: Konstantin Belousov <kostikbel@gmail.com> Cc: Matthias Andree <mandree@FreeBSD.org>, Brooks Davis <brooks@FreeBSD.org>, David Chisnall <theraven@freebsd.org>, "freebsd-ports@freebsd.org Ports" <freebsd-ports@freebsd.org>, Michael Gmelin <freebsd@grem.de> Subject: Re: Global destructor order problems (was: Re: Are ports supposed to build and run on 10-CURRENT?) Message-ID: <A60BFADA-E358-4363-8BED-E154AB327C6B@FreeBSD.org> In-Reply-To: <20130626210534.GY91021@kib.kiev.ua> References: <20130613031535.4087d7f9@bsd64.grem.de> <EF830CD7-00F1-4628-8515-76133BBE85E7@FreeBSD.org> <C1CC40FC-4489-4164-96B7-5E1A25DCB37F@FreeBSD.org> <20130626015508.426ab5b9@bsd64.grem.de> <51CAADB8.7090603@FreeBSD.org> <20130626133149.4835f14a@bsd64.grem.de> <7CD9075C-F8D6-41C1-8D21-8B10DF866ECE@FreeBSD.org> <20130626204521.GU91021@kib.kiev.ua> <6900C006-2A57-4EAF-B19A-629A85CBA001@FreeBSD.org> <20130626210534.GY91021@kib.kiev.ua>
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On Jun 26, 2013, at 23:05, Konstantin Belousov <kostikbel@gmail.com> =
wrote:
> On Wed, Jun 26, 2013 at 10:59:24PM +0200, Dimitry Andric wrote:
>> On Jun 26, 2013, at 22:45, Konstantin Belousov <kostikbel@gmail.com> =
wrote:
>>> On Wed, Jun 26, 2013 at 09:26:09PM +0200, Dimitry Andric wrote:
>>>> This revision is not in 9.1-RELEASE, but it is in 9-STABLE, so the
>>>> problem can also be reproduced there.
>>> ...
>>>> This is roughly gcc 4.3.0 and later. For example, gcc 4.8 =
generates:
>>> I just tested the thing with gcc 4.8 on up to date stable/9 and =
HEAD.
>>> In both cases, major tom did not fail, at least not in the peculiar =
way.
>>> The gcc-generated code passed the PLT address of the corresponding
>>> destructor.
>>=20
>> That is strange, did you compile the main program with -fPIC? That =
is
>> the problem case. If you don't compile the main program with -fPIC, =
the
>> problem will indeed not occur.
>=20
> I just used the Makefile provided by the earlier message, and it =
contains
> the -fPIC flag (which is strange thing to do on its own, binaries =
should
> use -fPIE).
>=20
> This is how the registration for the outer dtr looks for me, gcc =
4.8.1/i386:
>=20
> 0x08048763 <+42>: call 0x8048520 <_ZN5OuterC1Ev@plt>
> 0x08048768 <+47>: lea 0x28(%ebx),%eax
> 0x0804876e <+53>: mov %eax,0x8(%esp)
> 0x08048772 <+57>: lea 0x34(%ebx),%eax
> 0x08048778 <+63>: mov %eax,0x4(%esp)
> 0x0804877c <+67>: mov -0x4(%ebx),%eax
> 0x08048782 <+73>: mov %eax,(%esp)
> 0x08048785 <+76>: call 0x8048500 <__cxa_atexit@plt>
>=20
> ebx was set up earlier as the GOT pointer.
Strange, you must have a different gcc 4.8 than me, in my case it always =
uses GOT:
call _ZN5OuterC1Ev@PLT
leal __dso_handle@GOTOFF(%ebx), %esi
addl $12, %esp
pushl %esi
pushl %edi
pushl _ZN5OuterD1Ev@GOT(%ebx)
call __cxa_atexit@PLT
This is the lang/gcc48 port, btw.
-Dimitry
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