[Xen-devel] [PATCH v5 5/5] build/clang: add a check whether the assembler supports .skip with labels

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

Or else disable the integrated assembler for assembly files. This is
relevant for older clang versions which integrated assembler don't
support .skip with labels.

Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Cc: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Cc: Tim Deegan <tim@xxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
---
 xen/Rules.mk | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/xen/Rules.mk b/xen/Rules.mk
index 7adf757fb6..92102e36d9 100644
--- a/xen/Rules.mk
+++ b/xen/Rules.mk
@@ -72,7 +72,10 @@ AFLAGS-y                += -D__ASSEMBLY__
 
 # Older clang's built-in assembler doesn't understand .skip with labels:
 # https://bugs.llvm.org/show_bug.cgi?id=27369
-AFLAGS-$(clang)         += -no-integrated-as
+ifeq ($(clang),y)
+$(call as-insn-check,AFLAGS,CC,".L0:\n.L1:\n.skip (.L1 - .L0)",, \
+                     -no-integrated-as)
+endif
 
 ALL_OBJS := $(ALL_OBJS-y)
 
-- 
2.16.1


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