On Thu, Nov 07, 2024 at 10:26:46PM +1100, Michael Ellerman wrote:

From: Arnd Bergmann <arnd@arndb.de>

Unlike all other arches, powerpc doesn't allow the user to override CPP,
because it sets it unconditionally in the arch Makefile. This can lead
to strange build failures.

Instead add the required flags to KBUILD_CPPFLAGS, which are passed
to CPP, CC and AS invocations by the generic Makefile logic.

You can also use "CPP ?=" instead of "CPP =".  Your solution is better
I think, but, FYI, FFR :-)


Segher