[CMake] find_package for both debug and release with Visual Studio

[John Barbero Unenge]

I'm tearing my hair out about how to include thrid party libraries in my
cmake project. Currently I build Poco and a bunch of others that all
generate their respective <LibName>Config.cmake which I use with
find_package. I have a wrapping build script that builds all of my
dependencies and package them separately for debug and release (I don't
want to tweak their cmake-scripts unless I really really really need to
because maintanance).

I thought I could just do:

find_package(Foo
            HINTS "${CMAKE_SOURCE_DIR}/some/path/debug/libFoo/lib/cmake"
            REQUIRED
)
get_target_property(LIB_FOO_DEBUG lib_foo LOCATION)

find_package(Foo
            HINTS "${CMAKE_SOURCE_DIR}/some/path/release/libFoo/lib/cmake"
            REQUIRED
)
get_target_property(LIB_FOO_RELEASE lib_foo LOCATION)

set(LIB_FOO_LIBRARIES optimized "${LIB_FOO_RELEASE}" debug
"${LIB_FOO_DEBUG}")

message("LIB_FOO_LIBRARIES: \"${LIB_FOO_LIBRARIES}\"")
# Gives: LIB_FOO_LIBRARIES: "
optimized;C:/path/to/proj/some/path/debug/libFoo/lib/foo.lib;debug;C:/path/to/proj/some/path/debug/libFoo/lib/foo.lib"

It seems like the first call to find_package for target Foo is cached, whis
I don't really want.

Am I going about this the wrong way? How do I properly work with 3rd party
libraries with the Visual Studio generator?

Any pointers are greatly appreciated.

/ John
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