build/APRCommon.cmake

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#   to you under the Apache License, Version 2.0 (the
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#     http://www.apache.org/licenses/LICENSE-2.0
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function(_apru_config _program _varname _separate _regexp)
  execute_process(COMMAND ${_program} ${ARGN}
                  OUTPUT_VARIABLE _apru_output
                  RESULT_VARIABLE _apru_failed)

  if(_apru_failed)
    message(FATAL_ERROR "${_program} ${ARGN} failed")
  else()

    # Join multi-line outupt
    string(REGEX REPLACE "[\r\n]"       ""  _apru_output "${_apru_output}")

    # Optionally apply the regular expression filter
    if(NOT ${_regexp} STREQUAL "")
      string(REGEX REPLACE "${_regexp}" " " _apru_output "${_apru_output}")
    endif()

    # Remove leading and trailing spaces
    string(REGEX REPLACE "^ +"          ""  _apru_output "${_apru_output}")
    string(REGEX REPLACE " +$"          ""  _apru_output "${_apru_output}")

    # Optionally split the result into an argument list
    if(${_separate})
      separate_arguments(_apru_output)
    endif()

    set(${_varname} "${_apru_output}" PARENT_SCOPE)
  endif()
endfunction(_apru_config)