[Bug lto/106328] Build doesn't respect -j N flag

[rguenther at suse dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106328

--- Comment #8 from rguenther at suse dot de <rguenther at suse dot de> ---
On Wed, 10 Aug 2022, marxin at gcc dot gnu.org wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106328
> 
> Martin Liška <marxin at gcc dot gnu.org> changed:
> 
>            What    |Removed                     |Added
> ----------------------------------------------------------------------------
>          Resolution|---                         |FIXED
>              Status|ASSIGNED                    |RESOLVED
> 
> --- Comment #7 from Martin Liška <marxin at gcc dot gnu.org> ---
> Implemented for GCC 13.

Magically only with recent GNU make, otherwise needs proper prefixed
rules in the lto-wrapper generated makefile which I don't think we do.
Without either it's now slow by default?