powerpc-linux-gnu-gcc: error: unrecognized command line option ‘-mno-spe’

powerpc-linux-gnu-gcc: error: unrecognized command line option ‘-mno-spe’

[Antony Pavlov]

Hi Sascha!

I'm playing with MAKEALL script to build as many defconfigs as possible.
My build environment is base on Debian Buster.
Debian Buster has cross compiler for PowerPC32.

Alas I have no success with debian powerpc-linux-gnu-gcc 8.2.0-2.

After

  CROSS_COMPILE=powerpc-linux-gnu- ./MAKEALL -a ppc

the error message is:

  powerpc-linux-gnu-gcc: error: unrecognized command line option ‘-mno-spe’; did you mean ‘-fno-see’?
  powerpc-linux-gnu-gcc: error: unrecognized command line option ‘-mspe=no’; did you mean ‘-misel=no’?
  make[2]: *** [/home/builduser/barebox/./Kbuild:40: arch/ppc/lib/asm-offsets.s] Error 1
  make[1]: *** [/home/builduser/barebox/Makefile:832: prepare0] Error 2
  make[1]: *** Waiting for unfinished jobs....
  powerpc-linux-gnu-gcc: error: unrecognized command line option ‘-mno-spe’; did you mean ‘-fno-see’?
  powerpc-linux-gnu-gcc: error: unrecognized command line option ‘-mspe=no’; did you mean ‘-misel=no’?
  make[3]: *** [/home/builduser/barebox/scripts/Makefile.build:250: scripts/mod/empty.o] Error 1
  make[3]: *** Waiting for unfinished jobs....


With this linux kernel-based patch ppc build has no fail.

diff --git a/arch/ppc/Makefile b/arch/ppc/Makefile
index 05ec2438a..e575e5923 100644
--- a/arch/ppc/Makefile
+++ b/arch/ppc/Makefile
@@ -1,7 +1,12 @@
 
 CPPFLAGS += -ffixed-r14 -m32   \
        -meabi -D __PPC__ -D CONFIG_PPC \
-       -fno-strict-aliasing -mno-spe -mspe=no
+       -fno-strict-aliasing
+
+# No SPE instruction when building kernel
+# (We use all available options to help semi-broken compilers)
+CPPFLAGS += $(call cc-option,-mno-spe)
+CPPFLAGS += $(call cc-option,-mspe=no)
 
 ifdef CONFIG_RELOCATABLE
 CPPFLAGS += -fPIC -mrelocatable


I have no real powerpc experience to submit this patch.

Could you please comment this patch?

-- 
Best regards,
  Antony Pavlov

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Re: powerpc-linux-gnu-gcc: error: unrecognized command line option ‘-mno-spe’

[Andrey Smirnov]

On Wed, Jan 23, 2019 at 4:02 AM Antony Pavlov <antonynpavlov@gmail.com> wrote:
>
> Hi Sascha!
>
> I'm playing with MAKEALL script to build as many defconfigs as possible.
> My build environment is base on Debian Buster.
> Debian Buster has cross compiler for PowerPC32.
>
> Alas I have no success with debian powerpc-linux-gnu-gcc 8.2.0-2.
>
> After
>
>   CROSS_COMPILE=powerpc-linux-gnu- ./MAKEALL -a ppc
>
> the error message is:
>
>   powerpc-linux-gnu-gcc: error: unrecognized command line option ‘-mno-spe’; did you mean ‘-fno-see’?
>   powerpc-linux-gnu-gcc: error: unrecognized command line option ‘-mspe=no’; did you mean ‘-misel=no’?
>   make[2]: *** [/home/builduser/barebox/./Kbuild:40: arch/ppc/lib/asm-offsets.s] Error 1
>   make[1]: *** [/home/builduser/barebox/Makefile:832: prepare0] Error 2
>   make[1]: *** Waiting for unfinished jobs....
>   powerpc-linux-gnu-gcc: error: unrecognized command line option ‘-mno-spe’; did you mean ‘-fno-see’?
>   powerpc-linux-gnu-gcc: error: unrecognized command line option ‘-mspe=no’; did you mean ‘-misel=no’?
>   make[3]: *** [/home/builduser/barebox/scripts/Makefile.build:250: scripts/mod/empty.o] Error 1
>   make[3]: *** Waiting for unfinished jobs....
>
>
> With this linux kernel-based patch ppc build has no fail.
>
> diff --git a/arch/ppc/Makefile b/arch/ppc/Makefile
> index 05ec2438a..e575e5923 100644
> --- a/arch/ppc/Makefile
> +++ b/arch/ppc/Makefile
> @@ -1,7 +1,12 @@
>
>  CPPFLAGS += -ffixed-r14 -m32   \
>         -meabi -D __PPC__ -D CONFIG_PPC \
> -       -fno-strict-aliasing -mno-spe -mspe=no
> +       -fno-strict-aliasing
> +
> +# No SPE instruction when building kernel
> +# (We use all available options to help semi-broken compilers)
> +CPPFLAGS += $(call cc-option,-mno-spe)
> +CPPFLAGS += $(call cc-option,-mspe=no)
>
>  ifdef CONFIG_RELOCATABLE
>  CPPFLAGS += -fPIC -mrelocatable
>
>
> I have no real powerpc experience to submit this patch.
>
> Could you please comment this patch?
>

Since up until a year ago I was using Barebox on MPC8544 on a daily
basis and have some PowerPC patches I've been meaning to upstream,
I'll chime in. You wouldn't see this build failure if you were using a
PowerPC toolchain build with support for e500 enabled. AFAIK, distros
don't usually ship anything like that, but you can get a pre-build one
from here https://toolchains.bootlin.com/releases_powerpc-e500mc.html

However, I've never tried to build Barebox using a generic PowerPC
toolchain, so I don't really know for sure if having e500 support
truly matters for getting a working Barebox binary. Given that, I
don't see any harm in the change above.

Thanks,
Andrey Smirnov

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