On Wed, Apr 21, 2021 at 08:06:26PM +0200, Martin Liška wrote:
> On 4/21/21 7:56 PM, Jakub Jelinek wrote:
> > On Wed, Apr 21, 2021 at 11:50:02AM -0400, David Edelsohn via Gcc-patches
> > wrote:
> >> This patch broke bootstrap on AIX.
> >>
> >> std::thread is not provided in all instances. GCC is not compiled
> >> multi-threaded by default.
> >>
> >> error: `std::thread' has not been declared.
> >
> > In addition to that, I'm not really convinced it is a good idea,
> > e.g. for Linux I believe the previous implementation was much better
> > (as it counted only the cores/threads available to gcc subprocesses,
> > rather than all available on the system, so e.g. when running some
> > compilation job under taskset with std::thread::hardware_concurrency it
> > will oversubscribe the available CPUs).
>
> Well, the previous implementation was over-complicated! I think we can live
> with an implementation that covers 99% of the cases. It's parallel level
> for LTO LTRANS run.
No, it was the standard way how to query that information.
E.g. libgomp does that too.
Jakub
