When the media file for a specific language doesn't exist we try to symlink
it to the C one. If symlinking fails we need to fall back to copying the C
one like in the non-symlink case.
The fallback code path didn't set the source so this always failed.
Also check if the C fallback exists before trying to symlink/copy, otherwise
we crash if C isn't the first lang we try.
Currently default_options uses "" for the kwarks id, however this
is incorect and it must be "/". Additionally, this error won't be
ignored in the future with "--skip" (this is why the tests were
passing and this wasn't detected earlier).
when we are generating the include directories for a build target, then
we are iterating over all include directories, check if they are . or ..
and if not, generate a compile args object for it. However, the join
calls and the generation of the compile object is quite expensive, if we
cache the results of this, then we can _generate_single_compile from 60%
to roughly 50%.
the problem here is, that get_custom_target_provided_libraries iterated
over all generated sources of a target. In each output we check if this
is a library or not. In projects like EFL we have added a lot of
generated target to many different targets, so the iterating of the
output is rather consistent, with this commit we drop from 19% of the
time spending in get_custom_target_provided_libraries down to 3.51%.