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Re: [PATCH 3/5] build: arm64: provide -target and -march if using clang
- To: Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 29 Nov 2024 09:04:23 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>
- Delivery-date: Fri, 29 Nov 2024 08:04:34 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 29.11.2024 02:49, Volodymyr Babchuk wrote:
> Provide -target and -march explicitly when building with clang. This
> makes cross-compilation much easier, because clang accept this
> parameters regardless of host platform. Basically,
>
> make XEN_TARGET_ARCH=arm64 clang=y llvm=y
>
> will behave in the same way if building Xen on x86, or on arm64 or on
> any other platform.
>
> -march is required because with default value, clang will not
> recognize EL2 registers.
>
> Signed-off-by: Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>
> ---
> config/arm64.mk | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/config/arm64.mk b/config/arm64.mk
> index c4662f67d0..97eb9a82e7 100644
> --- a/config/arm64.mk
> +++ b/config/arm64.mk
> @@ -5,6 +5,10 @@ CONFIG_XEN_INSTALL_SUFFIX :=
>
> CFLAGS += #-marm -march= -mcpu= etc
>
> +ifeq ($(clang),y)
> +CFLAGS += -target aarch64 -march=armv8-a
> +endif
Why is this dependent on (just?) $(clang), not (also?) $(llvm)? Also
this affects both toolstack builds and hypervisor. Is applying -march
like this actually appropriate for the toolstack?
Jan
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