Add --extra_use_flags option, which updates the USE flag appropriately.

TEST=Built gcc compiler in chroot, passing the
--extra_use_flags="vtable_verify"; went into the chroot and verified
that the compiler built correctly.

PRESUBMIT=passed
R=llozano,asharif,shenhan,carrot,yunlian,bjanakiraman
APPROVED=llozano
DELTA=12  (11 added, 0 deleted, 1 changed)
OCL=65920-p2
RCL=66011-p2
RDATE=2013/02/21 14:52:10


P4 change: 42926966
1 file changed
tree: f8ec26bbbd0a8b0a5075980584ec08e1cc291350
  1. .git5_specs/
  2. v14/