[PATCH] don't enable DWARF5 by default on Windows (PR98860)

[Jakub Jelinek]

On Tue, Feb 09, 2021 at 07:47:00AM +0100, Richard Biener via Gcc-patches wrote:
> On February 8, 2021 10:44:26 PM GMT+01:00, Mikael Pettersson via Gcc-patches <gcc-patches@gcc.gnu.org> wrote:
> >PR98860 is a gcc-11 regression where bootstrap fails on Windows since
> >the switch to enable DWARF5 by default. The symptoms are that
> >executables generated by the stage1 compiler fail to run with "Exec
> >format error", which confuses subsequent configure steps and causes
> >hard errors. This happens even with the very latest binutils master.
> >
> >Fixed by updating SUBTARGET_OVERRIDE_OPTIONS to set dwarf_version to 4
> >unless the user explicitly requested another version. I see some other
> >targets did the same.
> >
> >Tested on Cygwin64 and mingw-w64.
> >
> >Ok for master?
> 
> It might be better to expose the default via configure (I've heard desires to control that elsewhere). 

But also it would be better to see some analysis what exactly and why
doesn't work.
What program emits that Exec format error message and why.

	Jakub