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include(CheckPrototypeDefinition)
function(check_prototype_definition_safe function prototype return header variable)
# temporarily save CMAKE_C_FLAGS and disable warnings about unused
# unused functions and parameters, otherwise they will always fail
# if ENABLE_WERROR is on
set(SAVED_CMAKE_C_FLAGS "${CMAKE_C_FLAGS}")
disable_warnings(unused-function)
disable_warnings(unused-parameter)
check_prototype_definition("${function}" "${prototype}" "${return}" "${header}" "${variable}")
# restore CMAKE_C_FLAGS
set(CMAKE_C_FLAGS "${SAVED_CMAKE_C_FLAGS}")
endfunction()
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