[CMake] Overriding imported project [CMakeImportBuildSettings.cmake]

[Mathieu Malaterre]

Hello,

  As cmake become more and more popular we can see more cmake packaged
project. One issue I am having right now is that I cannot finely
control a feature of CMake. I'd like to be able to override the import
of compiler options.
  For instance I have a package (let say VTK) which define:

SET(CMAKE_BUILD_SETTING_CXX_COMPILER "c++")
SET(CMAKE_BUILD_SETTING_CXX_FLAGS "")
SET(CMAKE_BUILD_SETTING_CXX_FLAGS_DEBUG "-g")
SET(CMAKE_BUILD_SETTING_CXX_FLAGS_RELEASE "-O3")
SET(CMAKE_BUILD_SETTING_CXX_FLAGS_MINSIZEREL "-Os")
SET(CMAKE_BUILD_SETTING_CXX_FLAGS_RELWITHDEBINFO "-O2 -g")


  Unless I do the correct symlink of c++ to the compiler I choose (let
say g++-4.2) cmake will not allow me to do so. Same goes for RELEASE
flag, in older cmake release -DNDEBUG was not part of the Release
flag...

  Here is the patch I am currently using (see cmake.patch). Advanced
user who knows that a certain compiler is compatible with another one
can set: CMAKE_OVERRIDE_COMPILER_MISMATCH. By default the old behavior
should be the same.

Thanks for comments,


-- 
Mathieu
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