Add CMake based build support on stable/2.10

[Mizux]

Add CMake based build + Makefile/docker CI + Travis-CI

[nikaza]

I love this. It would be amazing if we had a cmake version of cbc because we would then be able to contribute to the build and, more crucially, easily split the code into more files/classes and add our own files.

[Mizux]

@nikaza FYI I'm currently trying to maintain the last stable branch and master for projects:

• CoinUtils
• Osi
• Clp
• Cgl
• Cbc

which is more or less needed for my job which is to maintain google/or-tools project (which is currently migrating to CMake also)...

[nikaza]

Honestly that would be life-changing for so many reasons, you're a hero - I'm switching all my developers to this.

Could you add some build instructions for the dependencies? I tried creating a build folder and then the classic $ cmake .. but I'm getting a dependency error:

CMake Error at CMakeLists.txt:63 (find_package):
  Could not find a package configuration file provided by "CoinUtils" with
  any of the following names:

    CoinUtilsConfig.cmake
    coinutils-config.cmake

  Add the installation prefix of "CoinUtils" to CMAKE_PREFIX_PATH or set
  "CoinUtils_DIR" to a directory containing one of the above files.  If
  "CoinUtils" provides a separate development package or SDK, be sure it has
  been installed.

so I assume we need a certain directory layout and all cmake projects inside.

Do you have a link to the cmake build for the master project?

[tkralphs]

Sorry that this has been sitting for so long. We just haven't had the bandwidth to look at it yet!

[Mizux]

@nikaza not exactly, You can take a look at the CMake of google/or-tools
see: https://github.com/google/or-tools/blob/858fa626959f7e386153af82756384b79f983b5a/cmake/dependencies/CMakeLists.txt#L112-L180
and https://github.com/google/or-tools/blob/858fa626959f7e386153af82756384b79f983b5a/cmake/utils.cmake#L66-L126
which use a kind of prebuilt and local install using ExternalProject hack.

I'll try to provide a clean example using FetchContent OR/AND using a local install.

Also you can try to look at the dockerfile -> 1c70574#diff-ef27d5937c144ea10291b80274d3a311 where we install one by one in the system all the stack

ps: we can discuss about it on discord -> https://discord.gg/ENkQrdf