5186dac02b
This fixed issue that gnumake skip updating the cpp file that includes the generated header file when the .proto file gets updated. For example: Say a.cc includes b.pb.h, since b.pb.h is just byproduct of the rule that generates b.pb.cc, and though we have dependency "b.pb.h : b.pb.cc", but we don't have build recipe for that rule. Gmake stupidly thinks that b.pb.h must not be updated in that case so it skips all targets that depends on b.pb.h! With the dumy build recipe, gmake now doesn't skip the depedent targets. Bug: 13009798 Change-Id: I39adc09b7656bdd023f578fb8933667944fd974c