bug#62450: 29.0.60; Skip failing tests on Cygwin with native compilation

[Ken Brown <kbrown@cornell.edu>]

On 3/26/2023 10:54 AM, Eli Zaretskii wrote:
>> Date: Sun, 26 Mar 2023 10:15:17 -0400
>> Cc: 62450-done@debbugs.gnu.org
>> From: Ken Brown <kbrown@cornell.edu>

>> I've been building and running Emacs like this for a couple months and
>> not doing any rebasing, and I haven't seen a single fork failure outside
>> of the test suite.  So this might be the way to handle the problem in
>> the long run.
> 
> Feel free to install the above on master.

Good idea.  That way maybe it will get some more testing.  AFAIK, I'm 
the only one who's tried this so far (at the suggestion of Corinna, the 
Cygwin maintainer).

>> But I still hope to figure out what's different about native
>> compilation in the test suite.
> 
> You mean, why the fork fails?  I thought the PROBLEMS entry explains
> that?

No, I mean why ASLR doesn't prevent the fork failure in the test suite, 
even though it prevents it while building Emacs and in my daily use of 
Emacs.  Or maybe a better question is whether my ASLR patch is actually 
taking effect for the compilations done in the test suite.  There has to 
be something different going on there, but I don't know what.

Ken