From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Re: static vs. shared linking
Date: Wed, 25 Mar 2015 09:17:00 -0000 [thread overview]
Message-ID: <20150325090453.GB3017@calimero.vinschen.de> (raw)
In-Reply-To: <5511AF73.9070607@tiscali.co.uk>
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On Mar 24 18:39, David Stacey wrote:
> On 24/03/2015 00:02, David Stacey wrote:
> >I've been having difficulty building poco-1.6.0 for Cygwin for some
> >time. I've managed to produce a test case that shows the problem:
> >
> >https://dl.dropboxusercontent.com/u/119453582/Cygwin/crashtest.tar.xz
> >
> >This archive contains source files that produce a very simple library.
> >When linked statically, the code works fine. However, when linked as a
> >shared DLL, the test crashes with a core dump. The behaviour is
> >identical on x86 and x86_64 architectures.
> >
> >Have I made a stupid error in the compilation of the shared case, or is
> >something more interesting going on?
>
> I don't know if anyone has managed to look at this. I haven't had a deluge
> of e-mails telling me that I've done something silly (which is a shame,
> because then I could fix it quickly and move on). For the sake of a straw to
> clutch at, I tried compiling with clang++ rather than g++, and got the same
> result:
>
> $ ./go.sh
> Running test (static link)...
> Done.
>
> Running test (shared link)...
> ./go.sh: line 19: 3744 Aborted (core dumped)
> ./shared_test
> Done.
>
> Any help or hints would be greatly appreciated.
For a start, you should contemplate to build your test with -g to allow
debugging. Then you can run the testcase under GDB and get (more or less)
useful output. The crash occurs in a delete call, afaics. If you
install the cygwin-debuginfo package, addr2line returns something like this
as the call stack (non-required path components removed):
[...]/cygwin/exceptions.cc:1247
[...]/cygwin/exceptions.cc:1501
[...]/cygwin/sigproc.cc:717
[...]/cygwin/signal.cc:252
[...]/cygwin/signal.cc:303
[...]/cygwin/signal.cc:313
[...]/cygwin/signal.cc:289
[...]/cygwin/signal.cc:375
Everything up to here you can ignore, they are the result of the
abort() call in free(), which occurs here:
[...]/cygwin/malloc.cc:4779
[...]/cygwin/malloc_wrapper.cc:47
[...]/cygwin/sigfe.s:43
[...]/cygwin/libstdcxx_wrapper.cc:69
That's the actual call to the delete method.
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/include/c++/ext/new_allocator.h:110
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/include/c++/bits/basic_string.tcc:449
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/include/c++/bits/basic_string.h:249
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/include/c++/bits/basic_string.tcc:512
And this is where it comes from. It's a call to
void basic_string<_CharT, _Traits, _Alloc>::reserve(size_type __res)
But, really, I have no idea how this stuff is correlated. I'm not
a user of libstdc++. What's noticable is the fact that the crash does
*not* occur because the shared lib is unloaded or something like that.
However, building with -g allows you to step through the code and see
what happens, maybe that gives a clue.
HTH,
Corinna
--
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Maintainer cygwin AT cygwin DOT com
Red Hat
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next prev parent reply other threads:[~2015-03-25 9:04 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-24 8:07 David Stacey
2015-03-24 18:50 ` David Stacey
2015-03-25 9:17 ` Corinna Vinschen [this message]
2015-03-25 17:10 ` Warren Young
2015-03-25 22:42 ` David Stacey
2015-03-25 23:28 ` David Stacey
2015-03-25 22:48 ` David Stacey
2015-03-30 11:04 ` Corinna Vinschen
2015-03-30 19:17 ` David Stacey
2015-03-30 23:02 ` Andrey Repin
2015-03-31 0:50 ` David Stacey
2015-03-31 3:26 ` Andrey Repin
2015-03-31 9:05 ` Achim Gratz
2015-03-31 10:04 ` Corinna Vinschen
2015-03-31 9:07 ` Corinna Vinschen
2015-03-31 18:00 ` David Stacey
2015-04-09 8:15 ` David Stacey
2015-04-09 17:24 ` Corinna Vinschen
2015-04-11 18:51 ` David Stacey
2015-04-09 21:32 ` Larry Hall (Cygwin)
2015-04-11 19:21 ` David Stacey
2015-03-25 23:29 ` David Stacey
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