[U-Boot] [PATCH v2 3/7] buildman: Add support for building with clang

[sjg at google.com]

Add a -O option which allows building with clang.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

Changes in v2:
- Use the command line instead of environment for make variables

 tools/buildman/README           | 10 +++++++++
 tools/buildman/builderthread.py |  1 +
 tools/buildman/cmdline.py       |  2 ++
 tools/buildman/control.py       |  2 +-
 tools/buildman/toolchain.py     | 38 +++++++++++++++++++++++++++++----
 5 files changed, 48 insertions(+), 5 deletions(-)

Applied to u-boot-dm