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

[Eliot Miranda]

Hi Tobias,


> On Mar 21, 2018, at 10:54 PM, Tobias Pape <Das.Linux at gmx.de> wrote:
> 
> 
> 
>> On 22.03.2018, at 03:51, Ryan Macnak <rmacnak at gmail.com> wrote:
>> 
>> 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/show_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/OpenSmalltalk/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.
>> 
> 
> Maybe, but that is a different variant then.
> 
>> 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.
> 
> No, in this case it's just a (known) compiler bug.

No, Tobias.  It is urgent we decouple the Newspeak builds from the VM pipeline.  Cadence no longer use Newspeak.  There is very little energy in the Newspeak community to maintain the system.  Therefore when it breaks it can take a long time to fix.  We cannot be dependent on this.  It has nothing to do with specific bugs.  We need to have a build and verification pipeline that tests Squeak and Pharo, not one that first tests Newspeak and stalls, without testing Squeak and Pharo, if there are any problems in Newspeak.

> 
> Best regards
>    -Tobias


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