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[PATCH 3/5] build: arm64: provide -target and -march if using clang
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- Date: Fri, 29 Nov 2024 01:49:10 +0000
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- Cc: Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>
- Delivery-date: Fri, 29 Nov 2024 01:49:27 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Thread-index: AQHbQgDiBM9r6Gu0CEmbvf51boI0mQ==
- Thread-topic: [PATCH 3/5] build: arm64: provide -target and -march if using clang
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
+
# Use only if calling $(LD) directly.
LDFLAGS_DIRECT += -EL
--
2.47.0
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