tree da7cbc4665d3fc183794330706b559d5e80060ac
parent 488daf2e4b6c4e1f530a2354784f498c5d8135db
author Brendan Higgins <brendanhiggins@google.com> 1628290688 -0700
committer Brendan Higgins <brendanhiggins@google.com> 1628293634 -0700

prow-presubmit: make Prow only set --build_dir=. after v5.7

Prow tries to build Linux kernels in the source root directory. On newer
kernels, the best way to do this is to set the --build_dir flag to `.`.
Under the hood this sets the make variable `O=.` - on new kernels this
is fine, necessary, in fact. However, in kernels v5.2 and earlier Kbuild
doesn't know how to handle `O=.`. We only actually need to set the flag
in v5.7 kernels and later since KUnit defaulted to building in the
source root up until v5.7.

Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
Change-Id: Ibb6ed5114014632ee7f701af83f14b69b7769050