File: include_default.cmake

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cmake 4.2.1-2
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enable_language(C)
file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/main.c" "int main() { return 0;}")

set(include_dir "${CMAKE_CURRENT_BINARY_DIR}/dir")
set(default_include_dir "${CMAKE_CURRENT_BINARY_DIR}/dirDefault")
file(MAKE_DIRECTORY "${include_dir}")
file(MAKE_DIRECTORY "${default_include_dir}")

add_executable(main "${CMAKE_CURRENT_BINARY_DIR}/main.c")
include_directories("${include_dir}")
target_include_directories(main AFTER PRIVATE "${default_include_dir}")

get_target_property(actual_include_dirs main INCLUDE_DIRECTORIES)
set(desired_include_dirs "${include_dir}" "${default_include_dir}")
string(REGEX QUOTE desired_include_dirs_regex "${desired_include_dirs}")

if (NOT "${actual_include_dirs}" MATCHES "^${desired_include_dirs_regex}$")
    message(SEND_ERROR "include default does not work")
endif()