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Re: Core dump on 32-bit Cygwin if program calls dlopen


On 17/07/2014 08:37, Corinna Vinschen wrote:
On Jul 17 06:02, JonY wrote:
On 7/16/2014 15:02, Corinna Vinschen wrote:
On Jul 15 16:39, Corinna Vinschen wrote:
On Jul 15 21:55, JonY wrote:
On 7/15/2014 21:08, Corinna Vinschen wrote:

FWIW, the problem disappears if I revert gcc-core and libgcc1 to 4.8.2-2.

JonY, do you have a chance to have a look into this issue?

Sorry, I have been busy these few weeks, but I am well aware that there
is a problem with one of the libgcc changes, but has yet to investigate it.

I believe Jon Turney has looked into it somewhat.

I think this is the same or a similar problem to the one I reported at [1]. I also created a gcc bug [2], with a suggested patch.

Sounds good.  Thanks in advance.

Yesterday I asked my collegues to take a stab at the issue and one of
them, DJ Delorie, came up with a libgcc patch already.  It hasn't been
sent upstream yet.  Can we give it a try, perhaps by creating a new
libgcc DLL, please?

Thanks, I'll get to it this weekend, should I make the new gcc an
experimental version? Or is just the libgcc binary required?

It's the libgcc DLL which gives us grief, so a new libgcc package is
sufficent, afaics.  We should check if this DLL fixes the problem and
then make it "curr" soon, I think.

I briefly tested this other patch with my test case from the mail above, and it doesn't seem to help.

On 15/07/2014 15:45, Jan Nijtmans wrote:
> Is this essentially the same problem as described here?
>
>      <http://gcc.gnu.org/ml/gcc/2013-05/msg00180.html>

No, I think it is an unforeseen consequence of the patch [3] to fix that bug [4], which I believe is present in 4.8.3-1, introducing a new problem when an executable which doesn't depend on libgcc dlopen()s a dll which does.

[1] https://cygwin.com/ml/cygwin/2014-07/msg00083.html
[2] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61752
[3] https://sourceware.org/ml/cygwin/2013-07/msg00528.html
[4] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57982


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