On Thu, Sep 10, 2020 at 10:51:20PM +0900, Masahiro Yamada wrote:
> The minimal compiler versions, GCC 4.9 and Clang 10 support this flag.
>
> Here is the godbolt:
> https://godbolt.org/z/xvjcMa
>
> Signed-off-by: Masahiro Yamada <[email protected]>
Introduced in clang 3.5.0, see commit
4f43e554081ecac149fe360bee6eef2ed7dab8ea in LLVM.
Reviewed-by: Nathan Chancellor <[email protected]>
> ---
>
> Makefile | 2 +-
> arch/arm64/kernel/vdso32/Makefile | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/Makefile b/Makefile
> index 5102c89d3167..1d7c58684fda 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -940,7 +940,7 @@ KBUILD_CFLAGS += -fno-stack-check
> KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
>
> # Prohibit date/time macros, which would make the build non-deterministic
> -KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
> +KBUILD_CFLAGS += -Werror=date-time
>
> # enforce correct pointer usage
> KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
> diff --git a/arch/arm64/kernel/vdso32/Makefile b/arch/arm64/kernel/vdso32/Makefile
> index dfffd55175a3..1feb4f8e556e 100644
> --- a/arch/arm64/kernel/vdso32/Makefile
> +++ b/arch/arm64/kernel/vdso32/Makefile
> @@ -92,7 +92,7 @@ VDSO_CFLAGS += $(call cc32-option,-Wdeclaration-after-statement,)
> VDSO_CFLAGS += $(call cc32-option,-Wno-pointer-sign)
> VDSO_CFLAGS += -fno-strict-overflow
> VDSO_CFLAGS += $(call cc32-option,-Werror=strict-prototypes)
> -VDSO_CFLAGS += $(call cc32-option,-Werror=date-time)
> +VDSO_CFLAGS += -Werror=date-time
> VDSO_CFLAGS += $(call cc32-option,-Werror=incompatible-pointer-types)
>
> # The 32-bit compiler does not provide 128-bit integers, which are used in
> --
> 2.25.1
>