bug#29183: 27.0.50; SIGSEGV on C-g on Windows

[Eli Zaretskii]

> From: John Mastro <john.b.mastro@gmail.com>
> Date: Tue, 7 Nov 2017 13:24:15 -0800
> Cc: 29183@debbugs.gnu.org
> 
> > Can you show a preprocessed version of thread.c, where it does this:
> >
> >   static struct thread_state GCALIGNED main_thread;
> 
> What's the right invocation to get that?

You need to display it first.  Like this:

 $ cd src
 $ make thread.o -W thread.c V=1

This will compile thread.c and show the full command it uses to do
that.  Copy-paste that command at the shell prompt, but this time
replace -c (or add if -c is not there) with -E, and also add
"-o thread.ii" to the command line.  Then hit Enter.  The file
thread.ii will have the preprocessed source.

> $ gcc --version
> gcc.exe (Rev1, Built by MSYS2 project) 7.2.0

Should be okay, I think.  Does the problem go away if you remove
GCALIGNED from that line in thread.c and rebuild?