cmake_minimum_required(VERSION 2.8)

project(A C)

add_library(C_STATIC STATIC IMPORTED)
set_target_properties(C_STATIC PROPERTIES
  IMPORTED_LINK_INTERFACE_LANGUAGES "C"
  IMPORTED_LOCATION "/usr/lib/libz.a"
)

add_library(B_STATIC STATIC IMPORTED)
set_target_properties(B_STATIC PROPERTIES
  IMPORTED_LINK_INTERFACE_LANGUAGES "C"
  IMPORTED_LINK_INTERFACE_LIBRARIES "C_STATIC"
  IMPORTED_LOCATION "/usr/lib/libpng12.a"
)

add_library(A_STATIC STATIC foo.c)
target_link_libraries(A_STATIC B_STATIC)

add_library(A_SHARED SHARED foo.c)
target_link_libraries(A_SHARED B_STATIC)
set_target_properties(A_SHARED PROPERTIES
  LINK_INTERFACE_LIBRARIES ""
)

install(TARGETS A_STATIC A_SHARED 
  EXPORT MyExports
  DESTINATION "./lib"
)
install(EXPORT MyExports
  DESTINATION "./share"
)