[Vm-dev] cute, we crash gcc...

[Ryan Macnak]

On Tue, Mar 20, 2018 at 8:27 AM, Eliot Miranda <eliot.miranda at gmail.com>
wrote:

> Hi Tobias, Hi Ryan,
>
> On Tue, Mar 20, 2018 at 6:12 AM, Tobias Pape <Das.Linux at gmx.de> wrote:
>
>>
>> On 20.03.2018, at 13:58, Holger Freyther <holger at freyther.de> wrote:
>> >
>> >
>> >
>> >
>> >> On 20. Mar 2018, at 11:54, Tobias Pape <Das.Linux at gmx.de> wrote:
>> >>
>> >
>> > Hey!
>> >
>> >
>> >> https://travis-ci.org/OpenSmalltalk/opensmalltalk-vm/jobs/
>> 355802605#L2458
>> >
>> > indeed! I think it is this bug: https://gcc.gnu.org/bugzilla/s
>> how_bug.cgi?id=59477. I love how GCC developers add a regression test
>> for every issue fixed and they do it for many many years already. And it is
>> a codebase that is 30+ years old and started before SSA was "known".
>>
>> Yes, upgrading GCC fixes this (see https://travis-ci.org/OpenSmal
>> ltalk/opensmalltalk-vm/builds/355826629 )
>>
>> But the newspeak-bootstrap now fails.
>>
>> @Eliot, can you have a look at this?
>>         https://travis-ci.org/OpenSmalltalk/opensmalltalk-vm/jobs/
>> 355826630#L6518
>> I actually cannot fathom how a gcc upgrade should influence this, but
>> I'll hold whit the Pull Request until you say that its either my fault or
>> nothing to be afraid of.
>>
>
> Well, if it's a result of my enabling read-only objects (-DIMMUTABILITY=1)
> for all Spur VMs then I'll turn it off for the Newspeak builds,
>

Hm, I though object immutability was something implemented years ago?
Before Cog even.


> but the key point here is that we should decouple the Newspeak builds from
> the Pharo and Squeak builds asap.  Newspeak shouldn't block new releases of
> what should be perfectly good VMs.  This is urgent IMO.
>

If any VM configuration breaks because a compiler update, it's very likely
because of undefined behavior, and it casts doubt on the correctness of the
other configurations sharing code.
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