On Thu, Jul 30, 2020 at 09:02:43AM -0500, Steven Munroe wrote:
> Sergio writes:
>
> > Hello opencv [1] build also failed around LTO
>
> Looking at the build logs:
>
> https://koji.fedoraproject.org/koji/taskinfo?taskID=48055082
>
> For the build.log that ends with:
>
> lto1: error: '__builtin_altivec_vadub' requires the '-mcpu=power9' option
> lto1: fatal error: target specific builtin not available
> compilation terminated.
>
> The build uses a mix of compiler options.
>
> -mcpu=power8 -mtune=power8
> and
> -mcpu=power9 -mtune=power9
> and sometimes
> -mcpu=power8 ... -mcpu=power9 -mtune=power9
>
> I suspect this works at the level of individual object (*.o)
> generation but this might cause problems when a mix of -mcpu=power8
> and -mcpu=power9 objects are combined in LTO optimization.
>
> The compiler might get confused.
For targets which do support the target attribute, each function should be
marked with the right set of options before streaming it, there can be bugs
of course, especially on the rs6000 side which uses target attribute far
less often then e.g. x86_64.
Jakub
_______________________________________________
devel mailing list -- devel@lists.fedoraproject.org
To unsubscribe send an email to devel-le...@lists.fedoraproject.org
Fedora Code of Conduct:
https://docs.fedoraproject.org/en-US/project/code-of-conduct/
List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines
List Archives:
https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org
