[PATCH kernel] powerpc/makefile: Do not redefine $(CPP) for preprocessor

[Alexey Kardashevskiy]

The $(CPP) (do only preprocessing) macro is already defined in Makefile.
However POWERPC redefines it and adds $(KBUILD_CFLAGS) which results
in flags duplication. Which is not a big deal by itself except for
the flags which depend on other flags and the compiler checks them
as it parses the command line.

Specifically, scripts/Makefile.build:304 generates ksyms for .S files.
If clang+llvm+sanitizer are enabled, this results in
-fno-lto -flto -fsanitize=cfi-mfcall  .... -fno-lto -flto -fsanitize=cfi-mfcall
in the clang command line and triggers error:

clang-13: error: invalid argument '-fsanitize=cfi-mfcall' only allowed with '-flto'

This removes unnecessary CPP redifinition.

Signed-off-by: Alexey Kardashevskiy <aik at ozlabs.ru>
---
 arch/powerpc/Makefile | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index c9d2c7825cd6..3a2f2001c62b 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -214,7 +214,6 @@ KBUILD_CPPFLAGS	+= -I $(srctree)/arch/$(ARCH) $(asinstr)
 KBUILD_AFLAGS	+= $(AFLAGS-y)
 KBUILD_CFLAGS	+= $(call cc-option,-msoft-float)
 KBUILD_CFLAGS	+= -pipe $(CFLAGS-y)
-CPP		= $(CC) -E $(KBUILD_CFLAGS)
 
 CHECKFLAGS	+= -m$(BITS) -D__powerpc__ -D__powerpc$(BITS)__
 ifdef CONFIG_CPU_BIG_ENDIAN
-- 
2.25.1