method

have_framework

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have_framework(fw, &b) public

Returns whether or not the given framework can be found on your system. If found, a macro is passed as a preprocessor constant to the compiler using the framework name, in uppercase, prepended with HAVE_FRAMEWORK_.

For example, if have_framework(‘Ruby’) returned true, then the HAVE_FRAMEWORK_RUBY preprocessor macro would be passed to the compiler.

If fw is a pair of the framework name and its header file name that header file is checked, instead of the normally used header file which is named same as the framework.

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# File lib/mkmf.rb, line 1079
  def have_framework(fw, &b)
    if Array === fw
      fw, header = *fw
    else
      header = "#{fw}.h"
    end
    checking_for fw do
      src = cpp_include("#{fw}/#{header}") << "\n" "int main(void){return 0;}"
      opt = " -framework #{fw}"
      if try_link(src, opt, &b) or (objc = try_link(src, "-ObjC#{opt}", &b))
        $defs.push(format("-DHAVE_FRAMEWORK_%s", fw.tr_cpp))
        # TODO: non-worse way than this hack, to get rid of separating
        # option and its argument.
        $LDFLAGS << " -ObjC" if objc and /(\A|\s)-ObjC(\s|\z)/ !~ $LDFLAGS
        $LIBS << opt
        true
      else
        false
      end
    end
  end

have_framework

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