Zero crashing on Linux-sparc with gcc-9

[Vitaly Davidovich]

It might help (on the gcc bugtracker issue, if nothing else) to show gcc-8
(or latest working version) disassembly of SharedRuntime::generate_stubs()
and see what, if anything, stands out vs gcc9.

Also, what -O level is breaking?

It may be some UB that a newer version of gcc picks up on, so not
necessarily their bug.

On Tue, Sep 24, 2019 at 5:29 PM John Paul Adrian Glaubitz <
glaubitz at physik.fu-berlin.de> wrote:

> On 9/24/19 8:03 PM, Andrew Haley wrote:
> > On 9/22/19 9:19 AM, John Paul Adrian Glaubitz wrote:
> >> On 9/7/19 12:44 AM, John Paul Adrian Glaubitz wrote:
> >>> In addition to the build failure of the server VM with gcc-9, Zero is
> affected as
> >>> well, but here it's not a syntax issue but the VM is segfaulting when
> built with
> >>> gcc-9.
> >>>
> >>> Backtrace is below. Any suggestions?
> >> Reported to gcc upstream as
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91855.
> >
> > It's not obviously a GCC bug.
>
> Care to elaborate? What are the pointers in your opinion? It builds fine
> with gcc-7 and it used to build fine with older snapshot versions of
> gcc-8. I haven't tracked down yet which gcc patch introduced the
> breakage.
>
> Adrian
>
> --
>  .''`.  John Paul Adrian Glaubitz
> : :' :  Debian Developer - glaubitz at debian.org
> `. `'   Freie Universitaet Berlin - glaubitz at physik.fu-berlin.de
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