[CMake] CHECK_INCLUDE_FILES ignores CMAKE_FIND_ROOT_PATH, but should it?

[Bjørn Forsman]

Hi all,

I just found out that CHECK_INCLUDE_FILES ignores CMAKE_FIND_ROOT_PATH. The
documentation for CHECK_INCLUDE_FILES says:

  ...
  The following variables may be set before calling this macro  to
  modify the way the check is run:

    CMAKE_REQUIRED_FLAGS = string of compile command line flags
    CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
    CMAKE_REQUIRED_INCLUDES = list of include directories

So it seems intentional. But wouldn't it make sense to let CHECK_INCLUDE_FILES
look in CMAKE_FIND_ROOT_PATH? Or maybe more precise, give the compiler include
flags for CMAKE_FIND_ROOT_PATH/{include/,usr/include}? It just seems wrong to me
that include files in CMAKE_FIND_ROOT_PATH can be ignored like that and it
destroys the meaning of CMAKE_FIND_ROOT_PATH. Comments?

Is maybe CHECK_INCLUDE_FILES deprecated and FIND_PATH/FIND_FILE is the way
to go?

I'm using CMake 2.8.2.

Best regards,
Bjørn Forsman