tree 1e013344933a869e5fc7ac66b10f8dbaea4ed025
parent 9d4d0bfe29a446cb04961f8e35a0910ed235f671
author Alex Stewart <alexs.mac@gmail.com> 1522264863 +0100
committer Alex Stewart <alexs.mac@gmail.com> 1522312379 +0100

Require >= C++11 & CMake >= 3.5 when building Ceres.

- Removes CXX11 option, and all associate paraphernalia.  Ceres now
  requires a compiler with full >= C++11 support.  In MSVC terms this
  means >= 2013 Release 4.
- This deprecates the use of CERES_STD_UNORDERED_MAP and CERES_USE_CXX11
  as they will now always be defined.  They will be removed from the
  source in a future CL.
- For clients with CMake >= 3.8 we propagate via the exported/installed
  Ceres target the CXX version that was specified when Ceres was built.
  For versions < 3.8 (but >= 3.5) we specify the CXX features currently
  used in the Ceres public API.

Change-Id: I535b545b10156e4426659c270a4a0649e071df0e