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Re: [PATCH v2] xen/arm64: Add support Clang build on arm64
- To: Saman Dehghan <samaan.dehghan@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Julien Grall <julien@xxxxxxx>
- Date: Thu, 11 Dec 2025 09:35:55 +0000
- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- Delivery-date: Thu, 11 Dec 2025 09:36:03 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 11/12/2025 02:39, Saman Dehghan wrote:
This patch enables building Xen on arm64 architecture using the Clang compiler.
Changes include:
- Add explicit -march=armv8 flag for arm64 builds.
- Add `__attribute__((target("fp-armv8")))` to `vfp_save_state` and
`vfp_restore_state` functions when building with Clang to allow
FP instructions despite `-mgeneral-regs-only`.
Signed-off-by: Saman Dehghan <samaan.dehghan@xxxxxxxxx>
---
README | 2 ++
xen/arch/arm/arch.mk | 1 +
xen/arch/arm/arm64/vfp.c | 6 ++++++
3 files changed, 9 insertions(+)
diff --git a/README b/README
index 889a4ea906..67c1aa7fe6 100644
--- a/README
+++ b/README
@@ -45,6 +45,8 @@ provided by your OS distributor:
- For ARM:
- GCC 5.1 or later
- GNU Binutils 2.25 or later
+ or
+ - Clang/LLVM 11 or later
I forgot to ask. Is this cross-compiling or native? Or both?
And OOI, how did you chose Clang 11?
Cheers,
--
Julien Grall
|
