[U-Boot] [RFC 00/10] clang support for ARM

[Jeroen Hofstee]

Hi, I rebased some patches with should compile a working u-boot
with clang and gcc (besides a couple which don't have memset),
but I didn't bother too much about that for now.

Obviously this is not intended for the next release, but a
request for comment. Clang is not really fond of the gd
assignment and I tried to get rid of them since crt0.S already
handles this. I also added clearing gd (in a broken way) to
crt0.S to prevent all board_init_f having to do it again and
again (i2c / serial typically depends on it).

The most important question is if these patches break any
existing board. Your feedback is welcome.

Kind regards,
Jeroen

patches are also at (with some twister board specific ones):
https://github.com/jhofstee/u-boot/commits/v2014.07-rc2-clang

Jeroen Hofstee (10):
  ARM: crt0.S: clear the global data
  ARM: omap3/board: add spl specific board_init_f
  board_r: only assign gd when requested
  ARM: do not set gd in generic board again
  ARM: SPL: do not set gd again
  cc-option: make it work with clang
  ARM: make gd a function a function for clang
  inline: use the gcc inline version instead of the c99 one.
  eabi_compat: add __aeabi_memcpy __aeabi_memset
  README.clang: build command with clang

 arch/arm/cpu/armv7/omap3/board.c   | 15 ++++++++++-----
 arch/arm/include/asm/config.h      |  2 --
 arch/arm/include/asm/global_data.h | 17 +++++++++++++++++
 arch/arm/lib/crt0.S                |  6 ++++++
 arch/arm/lib/eabi_compat.c         | 15 +++++++++++++--
 arch/arm/lib/spl.c                 |  3 ---
 common/board_r.c                   |  2 +-
 doc/README.clang                   | 15 +++++++++++++++
 include/linux/compiler-gcc.h       |  7 ++++---
 scripts/Kbuild.include             |  4 ++--
 10 files changed, 68 insertions(+), 18 deletions(-)
 create mode 100644 doc/README.clang

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1.8.3.2