method

have_func

v1_9_1_378 - Show latest stable - Class: Object

have_func(func, headers = nil, &b)

public

Returns whether or not the function func can be found in the common header files, or within any headers that you provide. If found, a macro is passed as a preprocessor constant to the compiler using the function name, in uppercase, prepended with ‘HAVE_’.

For example, if have_func(‘foo’) returned true, then the HAVE_FOO preprocessor macro would be passed to the compiler.

# File lib/mkmf.rb, line 772
def have_func(func, headers = nil, &b)
  checking_for checking_message("#{func}()", headers) do
    if try_func(func, $libs, headers, &b)
      $defs.push(format("-DHAVE_%s", func.tr_cpp))
      true
    else
      false
    end
  end
end

have_func

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