On 2/9/21 2:07 AM, Jakub Jelinek via Gcc-patches wrote:
> 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.
Yea. It seems quite odd that a change in debug format triggers an exec
format error. I'd want to have a better understanding why before
acking this patch as well.
jeff
