CMAKE_CFG_INTDIR
----------------

Build-time reference to per-configuration output subdirectory.

For native build systems supporting multiple configurations in the
build tree (such as Visual Studio and Xcode), the value is a reference
to a build-time variable specifying the name of the per-configuration
output subdirectory.  On Makefile generators this evaluates to "."
because there is only one configuration in a build tree.  Example
values:

::

  $(IntDir)        = Visual Studio 6
  $(OutDir)        = Visual Studio 7, 8, 9
  $(Configuration) = Visual Studio 10
  $(CONFIGURATION) = Xcode
  .                = Make-based tools

Since these values are evaluated by the native build system, this
variable is suitable only for use in command lines that will be
evaluated at build time.  Example of intended usage:

::

  add_executable(mytool mytool.c)
  add_custom_command(
    OUTPUT out.txt
    COMMAND ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/mytool
            ${CMAKE_CURRENT_SOURCE_DIR}/in.txt out.txt
    DEPENDS mytool in.txt
    )
  add_custom_target(drive ALL DEPENDS out.txt)

Note that CMAKE_CFG_INTDIR is no longer necessary for this purpose but
has been left for compatibility with existing projects.  Instead
add_custom_command() recognizes executable target names in its COMMAND
option, so "${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/mytool"
can be replaced by just "mytool".

This variable is read-only.  Setting it is undefined behavior.  In
multi-configuration build systems the value of this variable is passed
as the value of preprocessor symbol "CMAKE_INTDIR" to the compilation
of all source files.