Re: Linux 4.19 and GCC 9

[Greg KH]

On Mon, Jun 10, 2019 at 04:42:27PM +0200, Miguel Ojeda wrote:
> On Mon, Jun 10, 2019 at 4:21 PM Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> wrote:
> >
> > > I also checked that 4.19.49 compiles fine with GCC 9, although with a
> > > lot of warnings, mostly from objtool, like "warning: objtool:
> > > sock_register()+0xd: sibling call from callable instruction with
> > > modified stack frame". But it's a start.
> 
> I think Josh Poimboeuf added support for a few related things in GCC 8
> (e.g. 13810435b9a7 ("objtool: Support GCC 8's cold subfunctions")).

That commit is already in all stable releases, so does there need to be
a gcc 9 specific one?

> > I'll look into these after the next round of kernels are released.  I
> > guess I'll go find a distro that has gcc9 on it to actually test
> > things...
> 
> I typically compile a bare-bones GCC for those things, it is quite quick.

Pointers to how to do that is appreciated.  It's been years since I had
to build gcc "from scratch".

thanks,

greg k-h