[CMake] How to handle COMPONENT arguments to find_package in my Config file?

[Stephen Kelly]

Hi,

In my GrantleeConfigVersion.cmake.in I can use ${PACKAGE_FIND_VERSION} which 
I presume is filled from the find_package command (I just copied the file 
from elsewhere).

Is there an equivalent for COMPONENTS so that if someone does a 

find_package(Grantlee COMPONENTS Foo Bar)

my config file would do something like:

if (${PACKAGE_FIND_COMPONENTS} CONTAINS "Foo")
   # Find the dependencies of Foo
endif()

if (${PACKAGE_FIND_COMPONENTS} CONTAINS "Bar")
   # Find the dependencies of Bar
endif()

Thanks,

Steve.