[v5, 1/4] powerpc/kbuild: set default generic machine type for 32-bit compile

[Michael Ellerman]

On Wed, 2018-05-30 at 12:19:19 UTC, Nicholas Piggin wrote:
> Some 64-bit toolchains uses the wrong ISA variant for compiling 32-bit
> kernels, even with -m32. Debian's powerpc64le is one such case, and
> that is because it is built with --with-cpu=power8.
> 
> So when cross compiling a 32-bit kernel with a 64-bit toolchain, set
> -mcpu=powerpc initially, which is the generic 32-bit powerpc machine
> type and scheduling model. CPU and platform code can override this
> with subsequent -mcpu flags if necessary.
> 
> This is not done for 32-bit toolchains otherwise it would override
> their defaults, which are presumably set appropriately for the
> environment (moreso than a 64-bit cross compiler).
> 
> This fixes a lot of build failures due to incompatible assembly when
> compiling 32-bit kernel with th Debian powerpc64le 64-bit toolchain.
> 
> Cc: Segher Boessenkool <segher at kernel.crashing.org>
> Signed-off-by: Nicholas Piggin <npiggin at gmail.com>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/4bf4f42a2febb449a5cc5d79e7c58e

cheers