Tests/AliasTarget/CMakeLists.txt

cmake_minimum_required(VERSION 2.8.11)
cmake_policy(SET CMP0054 NEW)
project(AliasTarget)

add_library(foo SHARED empty.cpp)
add_library(PREFIX::Foo ALIAS foo)
add_library(Another::Alias ALIAS foo)

add_library(objects OBJECT object.cpp)
add_library(Alias::Objects ALIAS objects)

target_compile_definitions(foo PUBLIC FOO_DEFINE)

add_library(bar SHARED empty.cpp)
target_compile_definitions(bar PUBLIC BAR_DEFINE)

target_link_libraries(foo LINK_PUBLIC $<$<STREQUAL:$<TARGET_PROPERTY:PREFIX::Foo,ALIASED_TARGET>,foo>:bar>)

add_executable(AliasTarget commandgenerator.cpp $<TARGET_OBJECTS:Alias::Objects>)
add_executable(PREFIX::AliasTarget ALIAS AliasTarget)
add_executable(Generator::Command ALIAS AliasTarget)

add_custom_command(OUTPUT commandoutput.h COMMAND Generator::Command)

add_library(bat SHARED bat.cpp "${CMAKE_CURRENT_BINARY_DIR}/commandoutput.h")
target_link_libraries(bat PREFIX::Foo)
target_include_directories(bat PRIVATE "${CMAKE_CURRENT_BINARY_DIR}")

add_executable(targetgenerator targetgenerator.cpp)
add_executable(Generator::Target ALIAS targetgenerator)

add_subdirectory(subdir)

add_custom_target(usealias Generator::Target $<TARGET_FILE:Sub::tgt>)
add_dependencies(bat usealias)

if (NOT TARGET Another::Alias)
  message(SEND_ERROR "Another::Alias is not considered a target.")
endif()

get_target_property(_alt PREFIX::Foo ALIASED_TARGET)
if (NOT ${_alt} STREQUAL foo)
  message(SEND_ERROR "ALIASED_TARGET is not foo: ${_alt}")
endif()

get_property(_alt2 TARGET PREFIX::Foo PROPERTY ALIASED_TARGET)
if (NOT ${_alt2} STREQUAL foo)
  message(SEND_ERROR "ALIASED_TARGET is not foo.")
endif()

add_library(iface INTERFACE)
add_library(Alias::Iface ALIAS iface)

get_property(_aliased_target_set TARGET foo PROPERTY ALIASED_TARGET SET)
if(_aliased_target_set)
  message(SEND_ERROR "ALIASED_TARGET is set for target foo")
endif()

get_target_property(_notAlias1 foo ALIASED_TARGET)
if (NOT DEFINED _notAlias1)
  message(SEND_ERROR "_notAlias1 is not defined")
endif()
if (_notAlias1)
  message(SEND_ERROR "_notAlias1 is defined, but foo is not an ALIAS")
endif()
if (NOT _notAlias1 STREQUAL _notAlias1-NOTFOUND)
  message(SEND_ERROR "_notAlias1 not defined to a -NOTFOUND variant")
endif()

get_property(_notAlias2 TARGET foo PROPERTY ALIASED_TARGET)
if (_notAlias2)
  message(SEND_ERROR "_notAlias2 evaluates to true, but foo is not an ALIAS")
endif()