[U-Boot] [PATCH v3 0/8] add clang support for some ARM boards

[Jeroen Hofstee]

Changes since v2:
   - As Albert pointed out the clang instructions don't work with
     Debian based binary packages. While I was aware of that it is
     for a different reason then I thought, it is not that ARM is not
     enabled as a backend but older versions are a bit more picky on
     the target argument and don't tolerate a trailing dash to it as
     used for CROSS_COMPILE etc. The README is updated accordingly.

     As a side note clang3.5-svn as shipped in Ubuntu is not the 3.5
     release but an snapshot of some svn commit and hence explain why
     the recompiled 3.5 can behave different then the ubuntu clang-3.5.
     Since it misses some patches, the clang3.5-svn can build less
     boards then 3.4 or an actual 3.5 release.

   - While add it, include Masahiro suggestion to also use c++ instead
     of g++.
   - Drop dependencies from the cover-letter as they are merged.
   - only patch 7/8 and 8/8 are reposted. 1..6 are the same as v2.

Changes since v1 (RFC):
  - Update the commit message for -Werror when polling for cc-options.
    As pointed out by Masahiro this is not needed for all arguments,
    but only for warning options.
  - drop SOC specific patch from this patchset, I will post it seperately.
  - Do implement get_gd for AARCH64.
  - Drop the memset patch for clearing gd / not reassinging gd and use
    Simon his version.
  - Drop the patch for using gnu inline version, since targets using the
    generic board no longer need it.
  - Limit update gd in board_init_r to ARM / ARM64, since powerpc does
    need it.
  - change __inline to inline and drop volatile from get_gd to make
    checkpatch happy.
  - add patch workaround for generated constants
  - add patch default to cc for host compiler
  - update README.clang
  - add SOB / cc

Jeroen Hofstee (8):
  board_r: ARM[64] do not set gd again
  ARM: SPL: do not set gd again
  cc-option: also detect unsupported warnings options
  ARM: make gd a function for clang
  eabi_compat: add __aeabi_memcpy __aeabi_memset
  clang: workaround for generated constants
  Makefile: default to cc for host compiler
  README.clang: build command with clang

 Kbuild                             |  3 +-
 Makefile                           |  4 +--
 arch/arm/include/asm/global_data.h | 25 +++++++++++++++++
 arch/arm/lib/eabi_compat.c         | 15 ++++++++--
 arch/arm/lib/spl.c                 |  3 --
 common/board_r.c                   |  2 +-
 doc/README.clang                   | 56 ++++++++++++++++++++++++++++++++++++++
 include/linux/kbuild.h             |  6 ++--
 scripts/Kbuild.include             |  4 +--
 9 files changed, 104 insertions(+), 14 deletions(-)
 create mode 100644 doc/README.clang

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2.1.0