Description

Currently ortools provide its own custom base library but it should use abseil-cpp instead which is the official way to get Google C++ "basic" set of libraries.

Here the roadmap of origin/abseil branch:

CCTZ Integration (DEPRECATED)

cctz is not needed anymore since abseil-cpp ship its own version.
(they have copy/paste the cctz code in https://github.com/abseil/abseil-cpp/tree/master/absl/time/internal/cctz)
note: debian already provide a cctz package...

1. Patch cctz to add cmake install rule (Missing CMake install rules cctz#82)
2. Backport cmake install rule to google/cctz (cf Add CMake install rules cctz#83)
3. Add cctz as third party deps in Makefile
4. Revert cctz to Makefile (cctz is now integrated in abseil-cpp)

Abseil-cpp Integration

1. Patch abseil-cpp to add cmake intall rule (Step 6: Allow Abseil to be installed and used with find_package() abseil/abseil-cpp#111)
2. Backport cmake install rule to abseil/abseil-cpp ([WIP] CMake Install rule proposal abseil/abseil-cpp#182)
3. Add abseil-cpp to Makefile based build on unix
4. Add abseil-cpp to Makefile based build on windows
5. Add abseil-cpp to CMake based build
6. Port or-tools to abseil: C++ Part (unix)
7. Port or-tools to abseil: C++ Part (windows)
8. Port C++ example to abseil
9. Port or-tools to abseil: Python Part
10. Port Python example to abseil
11. Port or-tools to abseil: Java Part
12. Port Java example to abseil
13. Port or-tools to abseil: .Net Part
14. Port .Net example to abseil
15. Update Python archive rules
16. Update .Net runtime nuget package
17. Update CC/Java/.Net archive rules