https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229669
--- Comment #4 from Frank Leonhardt <freebsd-...@fjl.co.uk> ---
I've had a look around.
What's happening?
clang is using it's internal assembler instead of calling the system one. It
chokes on the syntax.
Why is it happening?
There's a flag to stop it - "-no-integrated-as". This should be set in
/usr/share/mk/bsd.sys.mk:
----
# We need this conditional because many places that use it
# only enable it for some files with CLFAGS.$FILE+=${CLANG_NO_IAS}.
# unconditionally, and can't easily use the CFLAGS.clang=
# mechanism.
.if ${COMPILER_TYPE} == "clang"
CLANG_NO_IAS= -no-integrated-as
.endif
----
For some reason, on the Azure version, it isn't. I have a nasty feeling that
the make code that figures out which compiler it should be using isn't actually
working, and COMPILER_TYPE may not be setting properly. I'll find out if it's
worse after building the kernel, which takes AGES on Azure.
Work around?
You can over-ride CC
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