tree 4802b2a73d9d66260bc5d832cda95b94b4a185f3
parent cbf955474acf8f275b272da6ff5acd3a629cc806
author Alex Stewart <alexs.mac@gmail.com> 1399491977 +0100
committer Alex Stewart <alexs.mac@gmail.com> 1399629451 +0100

Adding autogenerated Ceres config.h to #define Ceres compile options.

- Previously we passed all compile options to Ceres via add_definitions
  in CMake.  This was fine for private definitions (used only by Ceres)
  but required additional work for public definitions to ensure they
  were correctly propagated to clients via CMake using
  target_compile_definitions() (>= 2.8.11) or add_definitions().
- A drawback to these approaches is that they did not work for chained
  dependencies on Ceres, as in if in the users project B <- A <- Ceres,
  then although the required Ceres public compile definitions would
  be used when compiling A, they would not be propagated to B.

- This patch replaces the addition of compile definitions via
  add_definitions() with an autogenerated config.h header which
  is installed with Ceres and defines all of the enabled Ceres compile
  options.
- This removes the need for the user to propagate any compile
  definitions in their projects, and additionally allows post-install
  inspect of the options with which Ceres was compiled.

Change-Id: Idbdb6abdad0eb31e7540370e301afe87a07f2260