[arm cross-compiling, clang] Error: selected processor does not support `ldrexd r2,r3,[r1]'

Hi All,

The system:
-----
% uname -a
FreeBSD bb052.bsnet 11.0-CURRENT FreeBSD 11.0-CURRENT #92 r266163: Thu
May 15 23:22:26 SAMT 2014
bsam_at_bb052.bsnet:/usr/obj/usr/src/sys/BB64X  amd64

% clang --version
FreeBSD clang version 3.4.1 (tags/RELEASE_34/dot1-final 208032) 20140512
Target: x86_64-unknown-freebsd11.0
Thread model: posix
-----

While cross-compiling (sources r266396) I get:
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% make -C /usr/src ARCH=arm TARGET_ARCH=armv6 buildworld
[...]
===> lib/clang/liblldbAPI (all)
c++   -O -pipe
-I/usr/src/lib/clang/liblldbAPI/../../../contrib/llvm/tools/lldb/include
-I/usr/src/lib/clang/liblldbAPI/../../
../contrib/llvm/tools/lldb/source
-I/usr/src/lib/clang/liblldbAPI/../../../contrib/llvm/include
-I/usr/src/lib/clang/liblldbAP
I/../../../contrib/llvm/tools/clang/include
-I/usr/src/lib/clang/liblldbAPI/../../../contrib/llvm/tools/lldb/source/API
-I. -I
/usr/src/lib/clang/liblldbAPI/../../../contrib/llvm/../../lib/clang/include
-DLLVM_ON_UNIX -DLLVM_ON_FREEBSD -D__STDC_LIMIT_MA
CROS -D__STDC_CONSTANT_MACROS -fno-strict-aliasing
-DLLVM_DEFAULT_TARGET_TRIPLE=\"armv6-gnueabi-freebsd11.0\" -DLLVM_HOST_TRIP
LE=\"armv6-unknown-freebsd11.0\" -DDEFAULT_SYSROOT=\"\"
-Qunused-arguments -std=c++11 -DLLDB_DISABLE_PYTHON -fno-exceptions -f
no-rtti -Wno-c++11-extensions -c
/usr/src/lib/clang/liblldbAPI/../../../contrib/llvm/tools/lldb/source/API/SBAddress.cpp
-o SB
Address.o
/tmp/SBAddress-9939f3.s: Assembler messages:
/tmp/SBAddress-9939f3.s:92: Error: selected processor does not support
`ldrexd r2,r3,[r1]'
/tmp/SBAddress-9939f3.s:141: Error: selected processor does not support
`ldrexd r2,r3,[r0]'
/tmp/SBAddress-9939f3.s:311: Error: selected processor does not support
`ldrexd r8,r9,[r0]'
/tmp/SBAddress-9939f3.s:312: Error: selected processor does not support
`strexd r1,r2,r3,[r0]'
/tmp/SBAddress-9939f3.s:320: Error: selected processor does not support
`ldrexd r2,r3,[r0]'
/tmp/SBAddress-9939f3.s:325: Error: selected processor does not support
`ldrexd r2,r3,[r0]'
/tmp/SBAddress-9939f3.s:329: Error: selected processor does not support
`ldrexd r2,r3,[r0]'
/tmp/SBAddress-9939f3.s:330: Error: selected processor does not support
`strexd r2,r4,r5,[r0]'
/tmp/SBAddress-9939f3.s:379: Error: selected processor does not support
`ldrexd r0,r1,[r0]'
/tmp/SBAddress-9939f3.s:507: Error: selected processor does not support
`ldrexd r2,r3,[r0]'
/tmp/SBAddress-9939f3.s:511: Error: selected processor does not support
`ldrexd r2,r3,[r0]'
/tmp/SBAddress-9939f3.s:512: Error: selected processor does not support
`strexd r2,r8,r9,[r0]'
/tmp/SBAddress-9939f3.s:665: Error: selected processor does not support
`ldrexd r4,r5,[r1]'
/tmp/SBAddress-9939f3.s:671: Error: selected processor does not support
`ldrexd r6,r7,[r1]'
/tmp/SBAddress-9939f3.s:678: Error: selected processor does not support
`ldrexd r2,r3,[r1]'
/tmp/SBAddress-9939f3.s:679: Error: selected processor does not support
`strexd r2,r6,r7,[r1]'
/tmp/SBAddress-9939f3.s:739: Error: selected processor does not support
`ldrexdne r0,r1,[r0]'
c++: error: assembler command failed with exit code 1 (use -v to see
invocation)
*** Error code 1

Stop.
make[6]: stopped in /usr/src/lib/clang/liblldbAPI
*** Error code 1
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-- 
WBR, Boris Samorodov (bsam)
FreeBSD Committer, http://www.FreeBSD.org The Power To Serve