FIX: propagation dependencies and rebuild out of date libs

[gangliao]

Pain points:

When I implemented buddy allocator, finally I want to merge all small pieces libraries to paddle_memory for testing memory recycling effects.

if(${WITH_GPU})
  nv_library(system_allocator SRCS system_allocator.cc DEPS gflags cpu_info gpu_info)
else(${WITH_GPU})
  cc_library(system_allocator SRCS system_allocator.cc DEPS gflags cpu_info)
endif(${WITH_GPU})

cc_test(system_allocator_test SRCS system_allocator_test.cc DEPS system_allocator)

cc_library(meta_data SRCS meta_data.cc)

cc_library(meta_cache SRCS meta_cache.cc)

cc_library(memory_block SRCS memory_block.cc)

cc_library(buddy_allocator SRCS buddy_allocator.cc DEPS glog)

cc_library(memory SRCS memory.cc)

cc_library(paddle_memory
    DEPS
    memory meta_data
    meta_cache memory_block
    buddy_allocator system_allocator)

cc_test(memory_test SRCS memory_test.cc DEPS place paddle_memory)

I found the original generic implementation doesn't allow propagation dependencies and also cannot track out of date records.

The new features for merging static libraries.

1. propagation dependencies
2. rebuild the out of date static library

[typhoonzero]

Why not using modifier: u?

r[ab][f][u]  - replace existing or insert new file(s) into the archive
[u]          - only replace files that are newer than current archive contents
[c]          - do not warn if the library had to be created

[gangliao]

https://bugzilla.redhat.com/show_bug.cgi?id=1155273

[gangliao]

I tested this flag, it can add new symbols into the library.

[typhoonzero]

Got it.

[typhoonzero]

LGTM!