complie m file to mex

 function varargout = foo( varargin )

 if ishandle( varargin{1} )

    ClickHandle = varargin{1} ;
    OldHandle = findobj( 'Type', 'figure', 'Tag', 'foo');
    if ishandle( OldHandle )
        delete( OldHandle );
    end

    FHandle = SD_figure ;

    set( FHandle,...
        'Tag',                   'foo',...
        'Units',                 'pixel', ...
        'menubar',               'none',...
        'NumberTitle',           'off',...
        'Visible',               'off',...
        'resize',               'off'...
        ) ;

    setappdata( FHandle, 'ClickHandle', ClickHandle ) ;

    generate_figure( FHandle );

    Init_figure( FHandle ) ;

    movegui( FHandle, 'center' );

    set( FHandle, 'Visible', 'on' );

 elseif ischar( varargin{1} )
    try
        if (nargout)
            [varargout{1:nargout}] = feval( varargin{:} );
        else
            feval( varargin{:} );
        end
    catch
        disp( lasterr );
    end
end

 %---------------------------------------------------------------------------------
function generate_figure( FHandle )

 global GlobalValue ;
....

This m file Contains a lot of functions.Add the input varargin can't be persistent.However,this file include global variable. how to complie it to mex.