Using ExternalProject_Add to build third party dependencies
Created by: gangliao
Add a directory external under cmake.
- Some dependencies should be optional, we first search them from system default, if not found, pull from git/svn/https, add them as external dependencies.
For instance,
swig, python, numpy, git
- Other dependencies should be added and installed default using
ExternalProject_Add.
For example,
glog, gflags, gtest, protobuf, openblas, zlib, warpctc
Pull and build remote third-party's source code is quite slow, we could add a CMake parameter USE_SYSTEM to make our CI system run faster.