Method: MakeMakefile#dir_config

Defined in:
lib/mkmf.rb

#dir_config(target, idefault = nil, ldefault = nil) ⇒ Object

call-seq:

dir_config(target)
dir_config(target, prefix)
dir_config(target, idefault, ldefault)

Sets a target name that the user can then use to configure various “with” options with on the command line by using that name. For example, if the target is set to “foo”, then the user could use the --with-foo-dir=prefix, --with-foo-include=dir and --with-foo-lib=dir command line options to tell where to search for header/library files.

You may pass along additional parameters to specify default values. If one is given it is taken as default prefix, and if two are given they are taken as “include” and “lib” defaults in that order.

In any case, the return value will be an array of determined “include” and “lib” directories, either of which can be nil if no corresponding command line option is given when no default value is specified.

Note that dir_config only adds to the list of places to search for libraries and include files. It does not link the libraries into your application.



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# File 'lib/mkmf.rb', line 1891

def dir_config(target, idefault=nil, ldefault=nil)
  key = [target, idefault, ldefault].compact.join("\0")
  if conf = $config_dirs[key]
    return conf
  end

  if dir = with_config(target + "-dir", (idefault unless ldefault))
    defaults = Array === dir ? dir : dir.split(File::PATH_SEPARATOR)
    idefault = ldefault = nil
  end

  idir = with_config(target + "-include", idefault)
  if conf = $arg_config.assoc("--with-#{target}-include")
    conf[1] ||= "${#{target}-dir}/include"
  end
  ldir = with_config(target + "-lib", ldefault)
  if conf = $arg_config.assoc("--with-#{target}-lib")
    conf[1] ||= "${#{target}-dir}/#{_libdir_basename}"
  end

  idirs = idir ? Array === idir ? idir.dup : idir.split(File::PATH_SEPARATOR) : []
  if defaults
    idirs.concat(defaults.collect {|d| d + "/include"})
    idir = ([idir] + idirs).compact.join(File::PATH_SEPARATOR)
  end
  unless idirs.empty?
    idirs.collect! {|d| "-I" + d}
    idirs -= Shellwords.shellwords($CPPFLAGS)
    unless idirs.empty?
      $CPPFLAGS = (idirs.quote << $CPPFLAGS).join(" ")
    end
  end

  ldirs = ldir ? Array === ldir ? ldir.dup : ldir.split(File::PATH_SEPARATOR) : []
  if defaults
    ldirs.concat(defaults.collect {|d| "#{d}/#{_libdir_basename}"})
    ldir = ([ldir] + ldirs).compact.join(File::PATH_SEPARATOR)
  end
  $LIBPATH = ldirs | $LIBPATH

  $config_dirs[key] = [idir, ldir]
end