Hi!

> commit 14831fad73f5ac30ac61760487d95a538e6ab3cb upstream.
> 
> When running the following command without arm-linux-gnueabi-gcc in
> one's $PATH, the following warning is observed:
> 
> $ ARCH=arm64 CROSS_COMPILE_COMPAT=arm-linux-gnueabi- make -j72 LLVM=1 mrproper
> make[1]: arm-linux-gnueabi-gcc: No such file or directory
> 
> This is because KCONFIG is not run for mrproper, so CONFIG_CC_IS_CLANG
> is not set, and we end up eagerly evaluating various variables that try
> to invoke CC_COMPAT.

Upstream commit is fine, but 5.10 port misses the 2> part of the
change.

> +++ b/arch/arm64/kernel/vdso32/Makefile
> @@ -48,7 +48,8 @@ cc32-as-instr = $(call try-run,\
>  # As a result we set our own flags here.
>  
>  # KBUILD_CPPFLAGS and NOSTDINC_FLAGS from top-level Makefile
> -VDSO_CPPFLAGS := -D__KERNEL__ -nostdinc -isystem $(shell $(CC_COMPAT) -print-file-name=include)
> +VDSO_CPPFLAGS := -D__KERNEL__ -nostdinc
> +VDSO_CPPFLAGS += -isystem $(shell $(CC_COMPAT) -print-file-name=include)
>  VDSO_CPPFLAGS += $(LINUXINCLUDE)
>  
>  # Common C and assembly flags
>

Best regards,
								Pavel
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