[Xen-devel] [PATCH 00/34] Add clang support for ARM and cleanups

[Julien Grall <julien.grall@xxxxxxxxxx>]

Hello all,

The main goal of this patch series is to add support for Clang on ARM.
The work has been done with Clang 3.5 which is not yet release but have
a good support for ARM32. I think clang 3.4 may also be able to compile
Xen but I didn't try.

With the first part of the serie (patch #1-#19 and patch #33), I'm able to boot
Xen compiled by Clang on midway. The patch #33 workaround for a bug in Clang
(http://llvm.org/bugs/show_bug.cgi?id=19199). I'm not sure if the patch would
be acceptable for Xen upstream.

While I was working on Clang 3.5, I played with -Wmissing-prototypes (patch 
#20-#30)
and discovered some exported functions which were:
    - the prototype were not declared before because of a missing include
    - never used

Finally the last part of this series (patch #31-33) contains a start of
bug fixes to be able to compile the tools with Clang. I didn't include
the patch https://patches.linaro.org/26826/.

The branch will all the patch applied (+few required patches) can be found here:
    git clone git://xenbits.xen.org/people/julieng/xen-unstable.git -b clang

Any comments and questions are welcomed.

Sincerely yours,

Julien Grall (34):
  xen: clang: Disable initializer-overrides warning
  xen: clang: Disable built-in assembler
  xen: clang: Support correctly cross-compile
  xen/compiler: Introduce always_unused define
  xen/xsm: flask: Remove unused function avc_sidcmp
  xen/x86: shadow: sh_next_page is only used when GUEST_PAGING_LEVELS =
    2
  xen/common: sched_sedf: Remove unused functions
  xen/common: rcupdate: Remove unused function rcu_batch_after
  xen/common: tmem: Remove dumb check in do_tmem_destroy_pool
  xen/crypto: rijndael: Fix compilation with Clang 3.5
  xen/arm: Introduce __builtin_stack_pointer
  xen/arm: psci: Don't need to check if vcpuid is negative
  xen/arm: gic: Introduce GIC_SGI_MAX
  xen/arm: mm: Mark check_memory_layout_alignment_constraints as unused
  xen/arm: traps: Mark check_stack_alignment_constraints as unused
  xen/arm: Guard correctly asm-arm/platforms/midway.h
  xen/arm: Guard correctly asm-arm/platform/omap5.h
  xen/arm: omap5: Correctly constify platform compatibility list
  xen/arm: Provide eabi wrapper for __aeabi_mem* functions
  xen/common: cpupool: cpupool_unassign_cpu is only used internally
  xen/common: domctl: Some functions are only used internally
  xen/common: tmem: Some functions are only used internally
  xen/sched: credit2: Some functions are only used internally
  xen/arm: setup: setup_cache is only used internally
  xen/arm: traps: show_stack is only used internally
  xen/arm: traps: Drop dump_guest_s1_walk
  xen/arm: time: move ticks_to_ns and ns_to_ticks in asm/time.h
  xen/xsm: flask: flask_disable is only used internally
  xen/xsm: flask: ss: remove unused function determine_oocontext
  xen: Add missing includes on different files
  tools: Disable ignored-attributes warning when compiling with clang
  tools/libxl: list_domains: shutdown is typed unsigned
  tools/libxl: libxl__json_object_to_yajl_gen should return
    yajl_gen_status
  DO NOT APPLY xen/common: kernel: Workaround clang 3.5

 config/StdGNU.mk                       |    6 +++-
 tools/Rules.mk                         |    2 ++
 tools/libxl/libxl_internal.h           |    2 +-
 tools/libxl/libxl_json.c               |   18 +++++-----
 tools/libxl/xl_cmdimpl.c               |    3 +-
 xen/Rules.mk                           |    3 ++
 xen/arch/arm/Makefile                  |    1 +
 xen/arch/arm/eabi.c                    |   29 +++++++++++++++
 xen/arch/arm/gic.c                     |    7 ++--
 xen/arch/arm/hvm.c                     |    1 +
 xen/arch/arm/mm.c                      |    4 ++-
 xen/arch/arm/platforms/omap5.c         |    2 +-
 xen/arch/arm/setup.c                   |    2 +-
 xen/arch/arm/shutdown.c                |    1 +
 xen/arch/arm/smp.c                     |    1 +
 xen/arch/arm/time.c                    |   11 +-----
 xen/arch/arm/traps.c                   |   61 ++------------------------------
 xen/arch/arm/vpsci.c                   |    2 +-
 xen/arch/arm/vtimer.c                  |    4 +--
 xen/arch/x86/mm/shadow/multi.c         |    2 ++
 xen/common/cpupool.c                   |    2 +-
 xen/common/domctl.c                    |   20 +++++------
 xen/common/event_channel.c             |    1 +
 xen/common/grant_table.c               |    1 +
 xen/common/kernel.c                    |    5 +--
 xen/common/multicall.c                 |    3 ++
 xen/common/rcupdate.c                  |    6 ----
 xen/common/sched_credit2.c             |   11 +++---
 xen/common/sched_sedf.c                |   12 -------
 xen/common/sort.c                      |    1 +
 xen/common/tmem.c                      |    9 +++--
 xen/crypto/rijndael.c                  |    3 ++
 xen/drivers/video/arm_hdlcd.c          |    1 +
 xen/include/asm-arm/current.h          |   17 +++++++--
 xen/include/asm-arm/gic.h              |    2 ++
 xen/include/asm-arm/platforms/midway.h |    2 +-
 xen/include/asm-arm/platforms/omap5.h  |    2 +-
 xen/include/asm-arm/time.h             |   13 +++++++
 xen/include/xen/compiler.h             |    2 ++
 xen/xsm/flask/avc.c                    |    5 ---
 xen/xsm/flask/flask_op.c               |    2 +-
 xen/xsm/flask/ss/conditional.h         |    1 +
 xen/xsm/flask/ss/services.c            |   14 --------
 43 files changed, 141 insertions(+), 156 deletions(-)
 create mode 100644 xen/arch/arm/eabi.c

-- 
1.7.10.4


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