linux-kernel - Re: [PATCH v3 1/5] arm64: vdso32: Introduce COMPAT_CC_IS

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Date:   Tue, 1 Oct 2019 18:14:13 +0100
From:   Will Deacon <will@...nel.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v3 1/5] arm64: vdso32: Introduce COMPAT_CC_IS_GCC

On Tue, Oct 01, 2019 at 10:12:59AM -0700, Nick Desaulniers wrote:
> On Tue, Oct 1, 2019 at 10:08 AM Will Deacon <will@...nel.org> wrote:
> >
> > On Tue, Oct 01, 2019 at 09:59:43AM -0700, Nick Desaulniers wrote:
> > > On Tue, Oct 1, 2019 at 9:47 AM Will Deacon <will@...nel.org> wrote:
> > > >
> > > > On Tue, Oct 01, 2019 at 04:30:56PM +0100, Catalin Marinas wrote:
> > > > > In the long run, I wouldn't mandate CROSS_COMPILE_COMPAT to always be
> > > > > set for the compat vDSO since with clang we could use the same compiler
> > > > > binary for both native and compat (with different flags). That's once we
> > > > > cleaned up the headers.
> > > >
> > > > But we'll still need it even with clang so that the relevant triple can be
> > > > passed to the --target option. The top-level Makefile already does this:
> > > >
> > > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Makefile#n544
> > >
> > > That's not pulling the cross compiler out of a *config* (as this patch
> > > is proposing); rather from an env var.
> >
> > CROSS_COMPILE_COMPAT is the environment variable, right? If not, then I have
> > my terminology mixed up.
> 
> Ah, sorry, I'm the one misreading the patch.  I thought the commit
> message was showing what the new process would be. I see now that it's
> describing the issue pre-patch.  My mistake.

Thanks. Thought I was losing the plot for a moment there!

Will