kc3-lang/libevent/cmake/CheckSymbolsExist.cmake

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• Hash : 503ba1d3
  Author :
  Date : 2020-03-16T20:11:06
  

  cmake: fix getaddrinfo checking error
  
  Using `CheckFunctionExists` on Windows to check `getaddrinfo`
  will get `not found`, but it actually exists. Using `CheckSymbolExists`
  with headers will get correct results. Other functions such as
  `getnameinfo`,`inet_ntop`,etc. have the same issue.
  

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• cmake/CheckSymbolsExist.cmake

• # Check if each symbol in the symbol list exists,
  # and define PREFIX__HAVE_SYMNAME to 1 if yes.
  #
  
  include(CheckSymbolExists)
  
  # SYMLIST: list of symbols to check
  # HEADERS: header files to be included in check code
  # PREFIX: the prefix of definition
  macro(CHECK_SYMBOLS_EXIST SYMLIST HEADERS PREFIX)
    foreach(SYMNAME ${SYMLIST})
      string(TOUPPER "${SYMNAME}" SYMNAME_UPPER)
      if("${PREFIX}" STREQUAL "")
        set(HAVE_SYM_DEF "HAVE_${SYMNAME_UPPER}")
      else()
        set(HAVE_SYM_DEF "${PREFIX}__HAVE_${SYMNAME_UPPER}")
      endif()
      CHECK_SYMBOL_EXISTS(${SYMNAME} "${HEADERS}" ${HAVE_SYM_DEF})
    endforeach()
  endmacro()
  

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