LoongArch: Include KBUILD_CPPFLAGS in CHECKFLAGS invocation
This is a port of commit 08f6554f ("mips: Include KBUILD_CPPFLAGS in CHECKFLAGS invocation") to arch/loongarch, for fixing cross-compilation of Linux/LoongArch with Clang, where previously the `--target` flag would no longer be present for the CHECKFLAGS cc invocation leading to build failure. Reported-by:Nathan Chancellor <nathan@kernel.org> Reviewed-by:
Nathan Chancellor <nathan@kernel.org> Link: https://github.com/ClangBuiltLinux/linux/issues/1787#issuecomment-1608306002 Signed-off-by:
WANG Xuerui <git@xen0n.name> Signed-off-by:
Huacai Chen <chenhuacai@loongson.cn>
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