[CMake] include_directories(SYSTEM, GNU.cmake and -isystem for C (not CXX)

[Brad King]

On 06/11/2011 02:08 AM, Campbell Barton wrote:
> To follow up on this, I tested this on a test project and found the
> problem was in my own macro which wasn't initializing an include list.
> So only the  set(CMAKE_INCLUDE_SYSTEM_FLAG_C "-isystem ") remains
> which should be fixed in CMake but is easy to workaround.

I updated your bug report here:

  http://www.cmake.org/Bug/view.php?id=12258#c26851

but for purposes of this list archive:

  http://cmake.org/gitweb?p=cmake.git;a=commitdiff;h=33f5a83a

-Brad