method

have_macro

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have_macro(macro, headers = nil, opt = "", &b) public

Returns whether or not macro is defined either in the common header files or within any headers you provide.

Any options you pass to opt are passed along to the compiler.

# File lib/mkmf.rb, line 991
  def have_macro(macro, headers = nil, opt = "", &b)
    checking_for checking_message(macro, headers, opt) do
      macro_defined?(macro, cpp_include(headers), opt, &b)
    end
  end

have_macro

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