Messages in this thread | | | Date | Mon, 16 May 2022 14:09:50 -0700 | Subject | [PATCH v3 0/4] pass -march= only to compiler | From | Nick Desaulniers <> |
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When both -march= and -Wa,-march= are specified for assembler or assembler-with-cpp sources, GCC and Clang will prefer the -Wa,-march= value but Clang will warn that -march= is unused.
warning: argument unused during compilation: '-march=armv6k' [-Wunused-command-line-argument]
This is the top group of warnings we observe when using clang to assemble the kernel via `ARCH=arm make LLVM=1`.
Arnd sent a v2 of my previous patch https://lore.kernel.org/linux-arm-kernel/20210928154143.2106903-14-arnd@kernel.org/ I added yet a few more instances I found since then.
Fixing this will allow us to enable -Werror=unused-command-line-argument for clang builds.
Nick Desaulniers (4): ARM: remove lazy evaluation in Makefile ARM: use .arch directives instead of assembler command line flags ARM: only use -mtp=cp15 for the compiler ARM: pass -march= only to compiler
arch/arm/Makefile | 76 ++++++++++++++++------------- arch/arm/boot/compressed/Makefile | 1 - arch/arm/common/Makefile | 2 - arch/arm/common/mcpm_head.S | 2 + arch/arm/common/vlock.S | 2 + arch/arm/kernel/Makefile | 2 - arch/arm/kernel/hyp-stub.S | 2 + arch/arm/kernel/swp_emulate.c | 1 + arch/arm/lib/Makefile | 4 -- arch/arm/lib/delay-loop.S | 4 ++ arch/arm/mach-at91/Makefile | 3 -- arch/arm/mach-at91/pm_suspend.S | 4 ++ arch/arm/mach-imx/Makefile | 3 -- arch/arm/mach-imx/headsmp.S | 2 + arch/arm/mach-imx/resume-imx6.S | 2 + arch/arm/mach-imx/suspend-imx6.S | 2 + arch/arm/mach-mvebu/Makefile | 3 -- arch/arm/mach-mvebu/coherency_ll.S | 1 + arch/arm/mach-mvebu/pmsu.c | 1 + arch/arm/mach-npcm/Makefile | 2 - arch/arm/mach-npcm/headsmp.S | 2 + arch/arm/mach-tegra/Makefile | 2 - arch/arm/mach-tegra/reset-handler.S | 2 + arch/arm/mach-tegra/sleep-tegra20.S | 2 + arch/arm/mach-tegra/sleep-tegra30.S | 2 + arch/arm/mm/Makefile | 15 ------ arch/arm/mm/abort-ev6.S | 1 + arch/arm/mm/abort-ev7.S | 1 + arch/arm/mm/cache-v6.S | 2 + arch/arm/mm/cache-v7.S | 2 + arch/arm/mm/cache-v7m.S | 2 + arch/arm/mm/copypage-feroceon.c | 1 + arch/arm/mm/proc-v6.S | 2 + arch/arm/mm/proc-v7-2level.S | 2 + arch/arm/mm/proc-v7.S | 2 + arch/arm/mm/tlb-v6.S | 2 + arch/arm/mm/tlb-v7.S | 2 + drivers/memory/Makefile | 2 - drivers/memory/ti-emif-sram-pm.S | 1 + drivers/soc/bcm/brcmstb/pm/Makefile | 1 - drivers/soc/bcm/brcmstb/pm/s2-arm.S | 1 + 41 files changed, 94 insertions(+), 74 deletions(-)
base-commit: 0ac824f379fba2c2b17b75fd5ada69cd68c66348 -- 2.36.0.550.gb090851708-goog
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