Incremental build for bitcoin I did use the Make to build bitcoin source  [https://github.com/bitcoin/bitcoin].
every thing went ok.

then I have changed one of file bitcoind.cpp , and issue the Make command again, but this time Make has tried to build all bitcoin source again.

my question is how to do Incremental build for  bitcoin?

my system is ubuntu, and g++ is Ubuntu 5.4.0-6ubuntu1~16.04.6
AFAIK there is no way to incrementally make. You either make or you don't.

But, you could try &gt;make bitcoin-qt and see if it just makes that module? Nope:

&gt;make bitcoin-qt
make: *** No rule to make target 'bitcoin-qt'.  Stop.