Desired platform for Travis CI testing about open3d HOT 4 CLOSED

Yeah I think we just need to check the following toolchains:

• Ubuntu 14.04 + gcc
• Ubuntu 16.04 + gcc
• OS X latest version + Clang coming with XCode

Then we manually check win10 + VS2015 build.

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For your interest. Travis-ci does not support Ubuntu 16.04. We need to explicitly setup Docker on the virtual machine. This will significantly increasing testing time. This is bad.

What we can do instead is specifying gcc version.

• Ubuntu 14.04 + gcc 4.8 (shipped with Ubuntu 14.04)
• Ubuntu 14.04 + gcc 5.4 (shipped with Ubuntu 16.04)

Our travis-ci subscription supports 2 testing machines. So, It is good to have even numbers for testing environment. My plan is

• Clang comming with XCode 8.0 (equivalent to OS X El Capitan)
• Clang comming with XCode 8.3 (equivalent to OS X Sierra)

from open3d.

Sounds good to me.
We will do manual tests once in a while anyways.
Just setup the Ubuntu and OSX tool chains to accelerate our development.

from open3d.

Closing issue as we have four environments described above.

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