linux-kernel - [PATCH 0/2] Harden clang against unknown flag options

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Message-Id: <20210824022640.2170859-1-nathan@kernel.org>
Date:   Mon, 23 Aug 2021 19:26:38 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, Masahiro Yamada <masahiroy@...nel.org>
Cc:     "H. Peter Anvin" <hpa@...or.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
        clang-built-linux@...glegroups.com, llvm@...ts.linux.dev,
        Nathan Chancellor <nathan@...nel.org>
Subject: [PATCH 0/2] Harden clang against unknown flag options

Hi all,

This series cleans up an issue that was noticed by the kernel test robot
where flags that clang does not implement support for are
unconditionally added to the command line, which causes all subsequent
calls to cc-{disable-warning,option} to fail, meaning developers are
flooded with unnecessary and pointless warnings.

I hope the patches in and of themselves are reasonable and
non-controversial. This is based on Masahiro's kbuild tree as there was
a fairly large refactor around where clang's flags were added so I
figured it would be best to go there with an x86 ack since the first
patch does not depend on anything in -tip.

Cheers,
Nathan

Nathan Chancellor (2):
  x86: Do not add -falign flags unconditionally for clang
  kbuild: Add -Werror=ignored-optimization-argument to CLANG_FLAGS

 arch/x86/Makefile_32.cpu | 12 +++++++++---
 scripts/Makefile.clang   |  4 ++++
 2 files changed, 13 insertions(+), 3 deletions(-)

base-commit: fb3fdea450305d932d933d7e75eead0477249d8e
-- 
2.33.0