Created by: reyoung

The demo code is here.

The issues are

• lib_b depends on lib_a.
• if a binary only depends on lib_b, that binary cannot link lib_a implicitly. We must declare the lib_a is also a dependency of that binary.

Should we make cc_binary and cc_library can lik the dependencies of dependency or not?

I think it is a little bit complex to implement this feature. Because it should handle diamond dependence problem and circle dependence problem

But if we do not implement this feature, the final binary of paddle should be very complex to write. Like

cc_binary(final_bin SRC final_bin_main.cc DEPS A B C D E ....) // a lot deps.