Re: [PATCH 3.15 33/37] Fix gcc-4.9.0 miscompilation of load_balance() in scheduler

Måns Rullgård
2014-08-06T10:23:47Z

Jakub Jelinek <jakub@redhat.com> writes:

> There have been several man-years of work to get from the 25% var coverage
> to 67%, several DWARF extensions (most of them to be available in DWARF5 or
> work in progress on that) and with -fno-var-tracking-assignments that is
> just returned to the old state.

This is a typical "but look at all the work we've put in, it *has* to
work" argument. As always, it is completely without merit.

>> In other words, anybody who relies on it has already learnt to work
>> around it. Or, more likely, there just isn't anybody who relies on it.
>>
>> I don't understand how you guys can be so cavalier about a compiler
>> bug that has already resulted in actual real problems. You bring up
>
> I have no problem with a -fno-var-tracking-assignments workaround for
> compilers that have the PR61801 wrong-code bug.

Are there any that with reasonable confidence do not?

--
Mï¿½ns Rullgï¿½rd
mans@mansr.com