CMake switch impl on fpic

gistfile1.txt

    add_library(I INTERFACE)

    add_library(IA STATIC impl1.cpp)

    set_target_properties(IA PROPERTIES POSITION_INDEPENDENT_CODE ON)
  
    add_library(IB STATIC impl2.cpp)
  
    set(has_iface "$<BOOL:$<TARGET_PROPERTY:POSITION_INDEPENDENT_CODE>>")
    target_link_libraries(I
        INTERFACE
        $<${has_iface}:IA>
        $<$<NOT:${has_iface}>:IB>
        )
  
     add_executable(Foo foo.cpp)
     target_link_libraries(Foo PUBLIC I) #links to IB
  
     add_library(Bar SHARED bar.cpp)
     target_link_libraries(Bar PUBLIC I) #links to IA