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enable_language(CXX)
include(FetchContent)
FetchContent_Declare(
IncludesSystem
SOURCE_DIR ${CMAKE_CURRENT_LIST_DIR}/IncludesSystem
SYSTEM
)
FetchContent_MakeAvailable(IncludesSystem)
FetchContent_Declare(
IncludesNonSystem
SOURCE_DIR ${CMAKE_CURRENT_LIST_DIR}/IncludesNonSystem
)
FetchContent_MakeAvailable(IncludesNonSystem)
function(check_target_system target expected_value)
get_target_property(var ${target} SYSTEM)
if ((var AND NOT expected_value) OR (NOT var AND expected_value))
message(SEND_ERROR "\
The 'SYSTEM' property of ${target} should be ${expected_value}, \
but got ${var}")
endif()
endfunction()
check_target_system(foo OFF)
check_target_system(bar ON)
check_target_system(zot ON)
check_target_system(subsub1foo OFF)
check_target_system(subsub1bar ON)
check_target_system(subsub1zot ON)
check_target_system(subsub2foo OFF)
check_target_system(subsub2bar ON)
check_target_system(subsub2zot ON)
check_target_system(foononsys OFF)
check_target_system(barnonsys OFF)
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