linux-kernel - Re: [PATCH] powerpc: e500: Fix compilation with gcc e500 compiler

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Date:   Mon, 4 Jul 2022 15:29:04 +0200
From:   Pali Rohár <pali@...nel.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Michael Ellerman <michael@...erman.id.au>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] powerpc: e500: Fix compilation with gcc e500 compiler

On Monday 04 July 2022 15:22:03 Arnd Bergmann wrote:
> On Mon, Jul 4, 2022 at 3:13 PM Pali Rohár <pali@...nel.org> wrote:
> > On Monday 04 July 2022 14:07:10 Arnd Bergmann wrote:
> 
> > > CFLAGS_CPU-$(CONFIG_PPC_BOOK3S_32) := -mcpu=powerpc
> > > CFLAGS_CPU-$(CONFIG_PPC_85xx) := -mcpu=8540
> > > CFLAGS_CPU-$(CONFIG_PPC8xx) := -mcpu=860
> > > CFLAGS_CPU-$(CONFIG_PPC44x) := -mcpu=440
> > > CFLAGS_CPU-$(CONFIG_PPC40x) := -mcpu=405
> > > ifdef CONFIG_CPU_LITTLE_ENDIAN
> > > CFLAGS_CPU-$(CONFIG_BOOK3S_64) := -mcpu=power8
> > > else
> > > CFLAGS_CPU-$(CONFIG_BOOK3S_64) := -mcpu=power5
> > > endif
> > > CFLAGS_CPU-$(CONFIG_BOOK3E_64) := -mcpu=powerpc64
> >
> > Yes, this is something I would expect that in Makefile should be.
> >
> > But what to do with fallback value?
> 
> Most of the fallback values can just be removed because we don't support
> building with gcc versions older than 5.1.0 any more. The only one
> that I think still needs a fallback is mtune=power9, which requires gcc-6.1
> or higher. CONFIG_POWER9_CPU could similarly use a
> "depends on GCC_VERSION > 60100".
> 
>         Arnd

And still what to do with 4bf4f42a2feb ("powerpc/kbuild: Set default
generic machine type for 32-bit compile")? I'm somehow lost there...