Re: [PATCH v3 3/4] ARM: only use -mtp=cp15 for the compiler

Nick Desaulniers
2022-05-16T21:16:12Z

+ Ard (I messed up my command line invocation of git send-email, sorry
for more noise)
https://lore.kernel.org/llvm/20220516210954.1660716-1-ndesaulniers@google.com/

On Mon, May 16, 2022 at 2:10 PM Nick Desaulniers
<ndesaulniers@google.com> wrote:
>
> Avoids an error from the assembler for CONFIG_THUMB2 kernels:
>
> clang-15: error: hardware TLS register is not supported for the thumbv4t
> sub-architecture
>
> This flag only makes sense to pass to the compiler, not the assembler.
>
> Perhaps CFLAGS_ABI can be renamed to CPPFLAGS_ABI to reflect that they
> will be passed to both the compiler and assembler for sources that
> require pre-processing.
>
> Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
> ---
> arch/arm/Makefile | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm/Makefile b/arch/arm/Makefile
> index 99a7ed7e9f09..1029c2503aef 100644
> --- a/arch/arm/Makefile
> +++ b/arch/arm/Makefile
> @@ -108,7 +108,7 @@ CFLAGS_ABI += -meabi gnu
> endif
>
> ifeq ($(CONFIG_CURRENT_POINTER_IN_TPIDRURO),y)
> -CFLAGS_ABI += -mtp=cp15
> +KBUILD_CFLAGS += -mtp=cp15
> endif
>
> # Accept old syntax despite ".syntax unified"
> --
> 2.36.0.550.gb090851708-goog
>

--
Thanks,
~Nick Desaulniers