Manoj, I split patch set 6 into two commits by the components, and they are sent to BlueZ upstream for review. Will update the progress here. Thanks.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay/+/616f149a9f3084131a1f46f28793884d96f2d119

commit 616f149a9f3084131a1f46f28793884d96f2d119
Author: Manoj Gupta <manojgupta@google.com>
Date: Tue Dec 06 00:30:38 2016

Use gcc to build net-wireless/bluez. Filter clang syntax.

Bluez does not build with latest llvm because of new
errors related to alignment and default argument promotion.

This is a temporary workaround while we wait for the real
fix to arrive from upstream.

BUG= chromium:665653 
TEST=bluez gets built

Change-Id: Ic91d0459802664f27d536f5ed208a44fbd530888
Reviewed-on: https://chromium-review.googlesource.com/416906
Commit-Ready: Manoj Gupta <manojgupta@chromium.org>
Tested-by: Luis Lozano <llozano@chromium.org>
Reviewed-by: Luis Lozano <llozano@chromium.org>

[add] https://crrev.com/616f149a9f3084131a1f46f28793884d96f2d119/chromeos/config/env/net-wireless/bluez

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/third_party/bluez/+/749cb98842b831d002f9889f2b1666ecc5ccf0be

commit 749cb98842b831d002f9889f2b1666ecc5ccf0be
Author: Miao-chen Chou <mcchou@chromium.org>
Date: Sat Dec 03 02:06:12 2016

UPSTREAM: gobex: Fix a compilation error for the compatibility with LLVM

The C Standard, subclause 7.16.1.4, paragraph 4 [ISO/IEC 9899:2011], states:
The parameter parmN is the identifier of the rightmost parameter in
the variable parameter list in the function definition (the one just
before the ...). If the parameter parmN is declared with the register
storage class, with a function or array type, or with a type that is
not compatible with the type that results after application of the
default argument promotions, the behavior is undefined.

BUG= chromium:665653 
TEST=emerge bluez with LLVM enforced

Change-Id: I8da7179a9ba3daceb0ab9a68bb882ee48ba113d9
Reviewed-on: https://chromium-review.googlesource.com/417985
Commit-Ready: Miao-chen Chou <mcchou@chromium.org>
Tested-by: Miao-chen Chou <mcchou@chromium.org>
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Miao-chen Chou <mcchou@chromium.org>

[modify] https://crrev.com/749cb98842b831d002f9889f2b1666ecc5ccf0be/gobex/gobex-packet.h
[modify] https://crrev.com/749cb98842b831d002f9889f2b1666ecc5ccf0be/gobex/gobex-transfer.c
[modify] https://crrev.com/749cb98842b831d002f9889f2b1666ecc5ccf0be/gobex/gobex.h
[modify] https://crrev.com/749cb98842b831d002f9889f2b1666ecc5ccf0be/gobex/gobex-packet.c
[modify] https://crrev.com/749cb98842b831d002f9889f2b1666ecc5ccf0be/gobex/gobex.c

The third patch has been upload for upstream review. See http://www.spinics.net/lists/linux-bluetooth/msg69074.html for the patch. The local copy also reflect the latest patch set (see crosreview.com/414227).

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/third_party/bluez/+/cc7f843f4599ea337e4ea3aa96aaa3e706e85bd3

commit cc7f843f4599ea337e4ea3aa96aaa3e706e85bd3
Author: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Date: Fri Dec 09 10:21:45 2016

UPSTREAM: monitor/rfcomm: Remove packed attribute from structs

These structs do not represent the raw PDU format thus they don't need
to be the exact same size.

BUG= chromium:665653 
TEST=emerge bluez with LLVM enforced

Change-Id: I464fe6890baa8f8db240038f473bc6408d9f3830
Reviewed-on: https://chromium-review.googlesource.com/421099
Commit-Ready: Miao-chen Chou <mcchou@chromium.org>
Tested-by: Miao-chen Chou <mcchou@chromium.org>
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Miao-chen Chou <mcchou@chromium.org>

[modify] https://crrev.com/cc7f843f4599ea337e4ea3aa96aaa3e706e85bd3/monitor/rfcomm.c

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/third_party/bluez/+/74a9159a7972153cee83524f07e6bfd8745396c5

commit 74a9159a7972153cee83524f07e6bfd8745396c5
Author: Miao-chen Chou <mcchou@chromium.org>
Date: Thu Nov 24 01:16:13 2016

FROMLIST: monitor/rfcomm: Fix a potential memory access issue for compatibility with LLVM

This patch removes "packed" attribute from the definition of struct rfcomm_rpn
to prevent the access to an unaligned struct member in mmc_rpn(). This patch
also introduces a temp variable in mcc_pn() to prevent unaligned access without
touching the definition of struct rfcomm_pn, since struct rfcomm_pn is used as
a PDU.

(cherry picked from http://www.spinics.net/lists/linux-bluetooth/msg69149.html)

BUG= chromium:665653 
TEST=emerge bluez with LLVM enforced

Change-Id: I934580c05fdf63311d7ccabee5bf5c8232c441b8
Reviewed-on: https://chromium-review.googlesource.com/414227
Commit-Ready: Miao-chen Chou <mcchou@chromium.org>
Tested-by: Miao-chen Chou <mcchou@chromium.org>
Reviewed-by: Puthikorn Voravootivat <puthik@chromium.org>
Reviewed-by: Miao-chen Chou <mcchou@chromium.org>

[modify] https://crrev.com/74a9159a7972153cee83524f07e6bfd8745396c5/monitor/rfcomm.c

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay/+/2942fae0a346ab88e6a7a1a14b5c7b0503781ef3

commit 2942fae0a346ab88e6a7a1a14b5c7b0503781ef3
Author: Miao-chen Chou <mcchou@chromium.org>
Date: Sat Dec 17 00:32:01 2016

Revert "Use gcc to build net-wireless/bluez. Filter clang syntax."

This reverts commit 616f149a9f3084131a1f46f28793884d96f2d119.
crosreview.com/414227 has landed to resolve the error messages during the
compilation of BlueZ.

BUG= chromium:665653 
TEST=emerge bluez with LLVM enforced

Change-Id: I923428e1bf0dd6f04fe40134994f2a12e4708e0a
Reviewed-on: https://chromium-review.googlesource.com/422582
Commit-Ready: Miao-chen Chou <mcchou@chromium.org>
Tested-by: Miao-chen Chou <mcchou@chromium.org>
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Miao-chen Chou <mcchou@chromium.org>

[delete] https://crrev.com/b389b214b59048e742cc89b19685d1a0b7edf4fe/chromeos/config/env/net-wireless/bluez

Once these patches, https://chromium-review.googlesource.com/q/project:chromiumos%252Fthird_party%252Fbluez+topic:llvm-migration, land, this can be marked as fixed.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/third_party/bluez/+/31b49f130ba580a5e3e54f45ea439b7c4d8953ab

commit 31b49f130ba580a5e3e54f45ea439b7c4d8953ab
Author: Miao-chen Chou <mcchou@chromium.org>
Date: Thu Dec 22 19:04:56 2016

Revert "FROMLIST: monitor/rfcomm: Fix a potential memory access issue for compatibility with LLVM"

This reverts commit 74a9159a7972153cee83524f07e6bfd8745396c5. This will be
replaced by the patches from BlueZ upstream.

BUG= chromium:665653 
TEST=None

Change-Id: I090df47ec107f8ca4e1515e35de25b3892822f85
Reviewed-on: https://chromium-review.googlesource.com/423347
Commit-Ready: Miao-chen Chou <mcchou@chromium.org>
Tested-by: Miao-chen Chou <mcchou@chromium.org>
Reviewed-by: Puthikorn Voravootivat <puthik@chromium.org>
Reviewed-by: Miao-chen Chou <mcchou@chromium.org>

[modify] https://crrev.com/31b49f130ba580a5e3e54f45ea439b7c4d8953ab/monitor/rfcomm.c

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/third_party/bluez/+/1c1767effcbcb57171bee5b53ff5f1ff5b2a37cc

commit 1c1767effcbcb57171bee5b53ff5f1ff5b2a37cc
Author: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Date: Tue Dec 20 09:52:00 2016

UPSTREAM: monitor/rfcomm: Fix left over packed struct

BUG= chromium:665653 
TEST=None

Change-Id: Iacc73564b20566e34cd7b72cface5f7ec39a1256
Reviewed-on: https://chromium-review.googlesource.com/423348
Commit-Ready: Miao-chen Chou <mcchou@chromium.org>
Tested-by: Miao-chen Chou <mcchou@chromium.org>
Reviewed-by: Puthikorn Voravootivat <puthik@chromium.org>
Reviewed-by: Miao-chen Chou <mcchou@chromium.org>

[modify] https://crrev.com/1c1767effcbcb57171bee5b53ff5f1ff5b2a37cc/monitor/rfcomm.c

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/third_party/bluez/+/4853c8e4cabf6c22cd0086298d23053f4725aa46

commit 4853c8e4cabf6c22cd0086298d23053f4725aa46
Author: Miao-chen Chou <mcchou@chromium.org>
Date: Thu Dec 22 00:12:33 2016

UPSTREAM: monitor/rfcomm: Fix a potential memory access issue for compatibility with LLVM

This patch removes "packed" attribute from the definition of struct rfcomm_rpn
to prevent the access to an unaligned struct member in mmc_rpn(). This patch
also introduces a temp variable in mcc_pn() to prevent unaligned access without
touching the definition of struct rfcomm_pn, since struct rfcomm_pn is used as
a PDU.

error messages from LLVM build:

monitor/rfcomm.c:238:36: error: taking address of packed member 'pm' of class
or structure 'rfcomm_rpn' may result in an unaligned pointer value
[-Werror,-Waddress-of-packed-member]
        if (!l2cap_frame_get_le16(frame, &rpn.pm))
monitor/rfcomm.c:287:36: error: taking address of packed member 'mtu' of class
or structure 'rfcomm_pn' may result in an unaligned pointer value
[-Werror,-Waddress-of-packed-member]
        if (!l2cap_frame_get_le16(frame, &pn.mtu))

Currently there is no corresponding flag in GCC to generate the same error
messages. See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=51628.

BUG= chromium:665653 
TEST=emerge bluez with LLVM enforced

Change-Id: I3a4dc7e93f8f8b3b549a5db8e3ce7536c121d705
Reviewed-on: https://chromium-review.googlesource.com/423349
Commit-Ready: Miao-chen Chou <mcchou@chromium.org>
Tested-by: Miao-chen Chou <mcchou@chromium.org>
Reviewed-by: Puthikorn Voravootivat <puthik@chromium.org>
Reviewed-by: Miao-chen Chou <mcchou@chromium.org>

[modify] https://crrev.com/4853c8e4cabf6c22cd0086298d23053f4725aa46/monitor/rfcomm.c

Closing. Please reopen it if its not fixed. Thanks!