CMake/Tests/IncludeDirectories/SystemIncludeDirectories/CMakeLists.txt

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cmake_minimum_required(VERSION 2.8)
project(SystemIncludeDirectories)
add_library(systemlib systemlib.cpp)
target_include_directories(systemlib PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/systemlib")
add_library(upstream upstream.cpp)
target_link_libraries(upstream LINK_PUBLIC systemlib)
target_compile_options(upstream PRIVATE -Werror=unused-variable)
target_include_directories(upstream SYSTEM PUBLIC
$<TARGET_PROPERTY:systemlib,INTERFACE_INCLUDE_DIRECTORIES>
)
add_library(consumer consumer.cpp)
target_link_libraries(consumer upstream)
target_compile_options(consumer PRIVATE -Werror=unused-variable)