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function(build_c_ares)
include(ExternalProject)
set(C-ARES_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/c-ares")
set(C-ARES_BINARY_DIR "${CMAKE_CURRENT_BINARY_DIR}/c-ares")
ExternalProject_Add(c-ares_ext
SOURCE_DIR "${C-ARES_SOURCE_DIR}"
CMAKE_ARGS
-DCARES_STATIC=ON
-DCARES_SHARED=OFF
-DCARES_INSTALL=OFF
BINARY_DIR "${C-ARES_BINARY_DIR}"
BUILD_COMMAND ${CMAKE_COMMAND} --build <BINARY_DIR>
INSTALL_COMMAND "")
add_library(c-ares::cares STATIC IMPORTED)
add_dependencies(c-ares::cares c-ares_ext)
set_target_properties(c-ares::cares PROPERTIES
INTERFACE_INCLUDE_DIRECTORIES "${C-ARES_SOURCE_DIR};${C-ARES_BINARY_DIR}"
IMPORTED_LINK_INTERFACE_LANGUAGES "C"
IMPORTED_LOCATION "${C-ARES_BINARY_DIR}/lib/libcares.a")
# to appease find_package()
add_custom_target(c-ares DEPENDS c-ares::cares)
# to be compatible with old Seastar
add_library(c-ares::c-ares ALIAS c-ares::cares)
endfunction()
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