[Pixman] Sanitizer undefined

[Bill Spitzak]

Looks like if you can turn off -fsanitize=shift (not clear how you do this)
it would fix it.

It seems like using unsigned rather than int could fix a lot of this, but
it complains about left-shifts of negative numbers (such as (-2)<<n which
is useful to get n 0 bits at the bottom). If this cannot be fixed by
writing unsigned(-2)<<n then it seems doubtful Pixman or Cairo could ever
pass these tests.


On Sat, Nov 17, 2018 at 11:09 PM LE GARREC Vincent <
legarrec.vincent at gmail.com> wrote:

> Hi,
>
> I just run the stress-test with CFLAGS="-fsanitize=undefined"
>
> I have lots of
> "runtime error: signed integer overflow: 2147254245 + 589815 cannot be
> represented in type 'int'"
> runtime error: left shift of 1 by 31 places cannot be represented in type
> 'int'
> runtime error: left shift of negative value -26
>
> Do you think these errors should be solved ?
>
> You can find enclosed the report,
> _______________________________________________
> Pixman mailing list
> Pixman at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/pixman
>
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