On Thu, Jan 20, 2022 at 1:40 PM Nathan Chancellor <nathan@xxxxxxxxxx> wrote:
>
> This flag is not supported by clang, which results in a warning:
>
> clang-14: warning: argument unused during compilation: '-mno-branch-likely' [-Wunused-command-line-argument]
>
> This breaks cc-option, which adds -Werror to make this warning fatal and
> catch flags that are not supported. Wrap the flag in cc-option so that
> it does not cause cc-option to fail, which can cause randconfigs to be
> really noisy.
>
> Signed-off-by: Nathan Chancellor <nathan@xxxxxxxxxx>
We should convert more of these tests to Kconfig checks that run once
per configuration, rather than multiple times for a build. IIRC Linus
mentioned this somewhere...yeah, the -Wimplicit-fallthrough patches.
See
dee2b702bcf06 ("kconfig: Add support for -Wimplicit-fallthrough")
I wonder if we can check ARCH or SUBARCH in Kconfig to limit invoking
the tool under test for certain arch specific command line flags?
I'll take this patch over such a larger change, but I think towards
the goal of speeding up already configured builds, we eventually want
to be migrating cc-option and ld-option checks to Kconfig.
Reviewed-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
> ---
> arch/mips/loongson64/Platform | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/arch/mips/loongson64/Platform b/arch/mips/loongson64/Platform
> index 981d3abc150e..acf9edc9b15d 100644
> --- a/arch/mips/loongson64/Platform
> +++ b/arch/mips/loongson64/Platform
> @@ -26,5 +26,6 @@ cflags-y += $(call cc-option,-mno-loongson-mmi)
> # Loongson Machines' Support
> #
>
> -cflags-$(CONFIG_MACH_LOONGSON64) += -I$(srctree)/arch/mips/include/asm/mach-loongson64 -mno-branch-likely
> +cflags-$(CONFIG_MACH_LOONGSON64) += -I$(srctree)/arch/mips/include/asm/mach-loongson64
> +cflags-$(CONFIG_MACH_LOONGSON64) += $(call cc-option,-mno-branch-likely)
> load-$(CONFIG_CPU_LOONGSON64) += 0xffffffff80200000
> --
> 2.34.1
>
>
--
Thanks,
~Nick Desaulniers
