Dogcows Code - chaz/yoink/blob - tools/link.lua

   1 #!/usr/bin/env lua
   2
   3 --
   4 -- Yoink
   5 -- Run this script to link the executable with fewer direct dependencies.
   6 --
   7 -- You shouldn't call this directly; instead, use the configure script's
   8 -- --enable-asneeded option and run make normally.  This isn't enabled by
   9 -- default because there is the potential for runtime linking problems on
  10 -- some platforms.  If you have a newer version of GCC, you should prefer
  11 -- the --as-needed linker flag over this method, though they both should
  12 -- accomplish the same thing.
  13 --
  14
  15
  16 -- List here any libraries that are known to not be needed on some
  17 -- platform.
  18 libraries = {
  19         "atk-1.0",
  20         "cairo",
  21         "fontconfig",
  22         "freetype",
  23         "gdk-x11-2.0",
  24         "gio-2.0",
  25         "glib-2.0",
  26         "gmodule-2.0",
  27         "ogg",
  28         "pango-1.0",
  29         "pangocairo-1.0",
  30         "pangoft2-1.0",
  31         "pthread",
  32         "vorbis"
  33 }
  34
  35
  36 -- We want to print only if verbose is set to true.
  37 do
  38         local verbose   = os.getenv("verbose") == "true"
  39         local oldprint  = print
  40
  41         print = function(...) if verbose then oldprint(unpack(arg)) end end
  42 end
  43
  44
  45 command         = arg[1]
  46 removed         = {}
  47
  48 -- Get the link command as passed on the command-line.
  49 for i,arg in ipairs(arg) do
  50         if i ~= 1 then
  51                 command = string.format("%s %q", command, arg)
  52         end
  53 end
  54
  55 original = command
  56
  57
  58 -- Check for libraries which aren't needed for successful linking.
  59 for i,library in ipairs(libraries) do
  60         local new_command = command:gsub("%s\"%-l"..library.."+\"%s", " ")
  61         if new_command ~= command then
  62                 if os.execute(new_command.." >/dev/null 2>&1") == 0 then
  63                         print("We DON'T need "..library)
  64                         table.insert(removed, library)
  65                         command = new_command
  66                 else
  67                         print("We DO need "..library)
  68                 end
  69         end
  70 end
  71
  72
  73 -- Perform the final link.
  74 if 0 < #removed and os.execute(command.." >/dev/null 2>&1") == 0 then
  75         local removed = table.concat(removed, ", ")
  76         print("Linked fine without some libraries: "..removed)
  77 elseif os.execute(original.." >/dev/null 2>&1") == 0 then
  78         print("Linked with the original link command.")
  79 else
  80         print("The link failed.  :-(")
  81         os.exit(1)
  82 end
  83