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Having just one depfile (.depend) means it has to be fully regenerated on every change, and it can't be done in parallel. After this change the rebuild time after touching a single test file has gone from 5.0 to 0.9 seconds. (make -j12) Build of tests from clean has gone from 8.1 to 5.5s. We could go even further and have one depfile per c-file, but this felt like a simple first step giving a nice improvement.
This port contains infrastructure and examples for running lwIP on Unix-like
operating systems (Linux, OpenBSD, cygwin). Much of this is targeted towards
testing lwIP applications.
* port/sys_arch.c, port/perf.c, port/include/arch/: Generic platform porting,
for both states of NO_SYS. (Mapping debugging to printf, providing
sys_now & co from the system time etc.)
* check: Runs the unit tests shipped with main lwIP on the Unix port.
* port/netif, port/include/netif: Various network interface implementations and
their helpers, some explicitly for Unix infrastructure, some generic (but most
useful on an easy to debug system):
* fifo: Helper for sio
* list: Helper for unixif
* pcapif: Network interface that replays packages from a PCAP dump file, and
discards packages sent out from it
* sio: Mapping Unix character devices to lwIP's sio mechanisms
* tapif: Network interface that is mapped to a tap interface (Unix user
space layer 2 network device). Uses lwIP threads.