tree 35b66bc55e8184ba596ca270a13d10c5f95d0091
parent cff1f681e77adebed2b6fbe6bca64c63857a9d67
author David Brazdil <dbrazdil@google.com> 1561981345 +0100
committer David Brazdil <dbrazdil@google.com> 1562327823 +0100

Build Linux and the Linux driver out of tree

Linux and the Hafnium module have been built inside their source tree so
far. The targets have a hardcoded toolchain but they get built multiple
times, once for each toolchain defined in GN. This can cause the build
to fail when two instances attempt to compile the same file at the same
time. Refactor the build scripts to compile the kernel and the module
in the out/ directory of each corresponding toolchain.

This cleans up the build files a bit but also introduces a new problem.
Out-of-tree kernel modules do not support building out of their folder.
This patch avoids that by copying the source files into
`target_out_dir`.

Test: kokoro/ubuntu/build.sh
Change-Id: I6fc10ebd9623f5f82dd086447b80d935c490765e