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cmake_minimum_required(VERSION 3.17 FATAL_ERROR)
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project(SystemIncludeDirectoriesPerLang)
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add_library(c_interface INTERFACE)
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set_target_properties(c_interface PROPERTIES
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INTERFACE_INCLUDE_DIRECTORIES "$<$<COMPILE_LANGUAGE:C>:${CMAKE_CURRENT_SOURCE_DIR}>"
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INTERFACE_SYSTEM_INCLUDE_DIRECTORIES "$<$<COMPILE_LANGUAGE:C>:${CMAKE_CURRENT_SOURCE_DIR}>"
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)
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target_compile_options(c_interface INTERFACE "$<$<COMPILE_LANG_AND_ID:C,GNU,Clang>:-Werror=unused-variable>;$<$<COMPILE_LANG_AND_ID:C,MSVC>:/we4101>")
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add_library(cxx_interface INTERFACE)
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set_target_properties(cxx_interface PROPERTIES
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INTERFACE_INCLUDE_DIRECTORIES "$<$<COMPILE_LANGUAGE:CXX>:${CMAKE_CURRENT_SOURCE_DIR}/cxx_system_include>"
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INTERFACE_SYSTEM_INCLUDE_DIRECTORIES "$<$<COMPILE_LANGUAGE:CXX>:${CMAKE_CURRENT_SOURCE_DIR}/cxx_system_include>"
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)
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target_compile_options(cxx_interface INTERFACE "$<$<COMPILE_LANG_AND_ID:CXX,GNU,Clang>:-Werror=unused-variable>;$<$<COMPILE_LANG_AND_ID:C,MSVC>:/we4101>")
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# The C header must come before the C++ header for this test to smoke out the
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# failure. The order of sources is how CMake determines the include cache
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# and we need it to cache on the 'bad' language first
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add_executable(consume_multi_lang_includes main.c smoke_out_includes.cxx)
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target_link_libraries(consume_multi_lang_includes PRIVATE c_interface cxx_interface)
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