[MacPorts] #44508: ruby21: fix compilation with libffi (*3.1!) so that module fiddle works

[MacPorts]

#44508: ruby21: fix compilation with libffi (*3.1!) so that module fiddle works
--------------------------+--------------------------------
  Reporter:  jfs.world@…  |      Owner:  macports-tickets@…
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.3.1
Resolution:               |   Keywords:
      Port:               |
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Comment (by jfs.world@…):

 Ok sorry, the patch should be this instead (ext/fiddle/closure.c relies on
 RUBY_LIBFFI_MODVERSION being generated off of a 3-digit 'ver')!

 {{{
 --- ext/fiddle/extconf.rb.orig  2013-05-19 10:42:16.000000000 +0800
 +++ ext/fiddle/extconf.rb       2014-07-31 23:39:34.000000000 +0800
 @@ -7,7 +7,9 @@
  pkg_config("libffi")
  if ver = pkg_config("libffi", "modversion")
    ver = ver.gsub(/-rc\d+/, '') # If ver contains rc version, just
 ignored.
 -  $defs.push(%{-DRUBY_LIBFFI_MODVERSION=#{ '%d%03d%03d' % ver.split('.')
 }})
 +  ver_split = ver.split('.')
 +  ver_split.push '0' if ver_split.length == 2
 +  $defs.push(%{-DRUBY_LIBFFI_MODVERSION=#{ '%d%03d%03d' % ver_split }})
  end

  unless have_header('ffi.h')
 }}}

-- 
Ticket URL: <https://trac.macports.org/ticket/44508#comment:1>
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