Import firmware compiler flags

Import firmware compiler flags

If passed into Makefile, compiler flags for firmware (so far CC and CFLAGS) will
override old values to make sure that the compiled vboot_reference library has
calling convention and etc. compatible with the firmware.

See also CL:6355014

BUG=None
TEST=See the CL for related ebuilds

Committed: http://chrome-svn/viewvc/chromeos?view=rev&revision=440ad51

[Tom Wai-Hong Tam, 2011-01-26 10:08:43]

LGTM

[robotboy, 2011-01-26 19:43:20]

http://codereview.chromium.org/6257018/diff/1/Makefile
File Makefile (right):

http://codereview.chromium.org/6257018/diff/1/Makefile#newcode20
Makefile:20: endif
Won't these CFLAGS be overridden by the include of FIRMWARE_CONFIG_PATH?

[Che-Liang Chiou, 2011-01-27 02:12:53]

Thanks for comments. Please check out the new patchset.

http://codereview.chromium.org/6257018/diff/1/Makefile
File Makefile (right):

http://codereview.chromium.org/6257018/diff/1/Makefile#newcode20
Makefile:20: endif
On 2011/01/26 19:43:20, robotboy wrote:
> Won't these CFLAGS be overridden by the include of FIRMWARE_CONFIG_PATH?

They will if FIRMWARE_CONFIG_PATH is not empty.

I should reorder CFLAGS settings and add more comments here.

[robotboy, 2011-01-27 02:18:30]

LGTM, thanks.