Parallelize the compilation using Threads

[Oleg Endo]

On Tue, 2019-02-12 at 15:12 +0100, Richard Biener wrote:
> On Mon, Feb 11, 2019 at 10:46 PM Giuliano Belinassi
> <giuliano.belinassi@usp.br> wrote:
> > 
> > Hi,
> > 
> > I was just wondering what API should I use to spawn threads and
> > control
> > its flow. Should I use OpenMP, pthreads, or something else?
> > 
> > My point what if we break compatibility with something. If we use
> > OpenMP, I'm afraid that we will break compatibility with compilers
> > not
> > supporting it. On the other hand, If we use pthread, we will break
> > compatibility with non-POSIX systems (Windows).
> 
> I'm not sure we have a thread abstraction for the host - we do have
> one for the target via libgcc gthr.h though.  For prototyping I'd
> resort
> to this same interface and fixup the host != target case as needed.

Or maybe, in the year 2019, we could assume that most c++ compilers
which are used to compile GCC support c++11 and come with an adequate
<thread> implementation...  yeah, I know, sounds jacked :)

Cheers,
Oleg