The compiler tries to compile the same source multiple times and more
importantly write out to the same filename. Adding a lock to prevent
simultaneous compilation solves this issue. This is particularly
noticeable in integer_ops testing when using offline compilation,
but just in case, hold the lock for the entire program creation.
Signed-off-by: Mats Petersson <mats.petersson@arm.com>
Signed-off-by: Stuart Brady <stuart.brady@arm.com>
ce484988ab