Apply clang '--target=' KBUILD_CPPFLAGS shuffle to linux-6.4.y and linux-6.3.y

From: Nathan Chancellor <nathan@kernel.org>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Sasha Levin <sashal@kernel.org>
Cc: stable@vger.kernel.org, llvm@lists.linux.dev,
	Masahiro Yamada <masahiroy@kernel.org>,
	Nick Desaulniers <ndesaulniers@google.com>
Subject: Apply clang '--target=' KBUILD_CPPFLAGS shuffle to linux-6.4.y and linux-6.3.y
Date: Mon, 3 Jul 2023 08:03:39 -0700	[thread overview]
Message-ID: <20230703150339.GA1975402@dev-arch.thelio-3990X> (raw)

Hi Greg and Sasha,

Please consider applying the following patches to 6.4 and 6.3, they
should apply cleanly.

08f6554ff90e ("mips: Include KBUILD_CPPFLAGS in CHECKFLAGS invocation")
a7e5eb53bf9b ("powerpc/vdso: Include CLANG_FLAGS explicitly in ldflags-y")
cff6e7f50bd3 ("kbuild: Add CLANG_FLAGS to as-instr")
43fc0a99906e ("kbuild: Add KBUILD_CPPFLAGS to as-option invocation")
feb843a469fb ("kbuild: add $(CLANG_FLAGS) to KBUILD_CPPFLAGS")

They resolve and help avoid build breakage with tip of tree clang, which
has become a little stricter in the flags that it will accept for a
particular target, which requires '--target=' to be passed along to all
invocations of $(CC). Our continuous integration does not currently show
any breakage with 6.1 and earlier; should these patches be needed there,
I will send them at a later time.

Cheers,
Nathan