On platforms such as Android, legacy macros are no longer defined.
Hence, we define them in terms of the new POSIX macros if the new ones are defined. Otherwise, we throw an error.

Signed-off-by: Mohamed A. Bamakhrama <mohamed@alumni.tum.de>
Signed-off-by: Miodrag Milanovic <mmicko@gmail.com>

Abort on OOM since there are no C++ exceptions yet.

Signed-off-by: Miodrag Milanovic <mmicko@gmail.com>

Consider unconnected carry-out ports

Signed-off-by: Maciej Kurc <mkurc@antmicro.com>