mcs/tools/mkbundle/mkbundle.cs

   1 //
   2 // mkbundle: tool to create bundles.
   3 //
   4 // Based on the `make-bundle' Perl script written by Paolo Molaro (lupus@debian.org)
   5 //
   6 // Author:
   7 //   Miguel de Icaza
   8 //
   9 // (C) Novell, Inc 2004
  10 //
  11 using System;
  12 using System.Diagnostics;
  13 using System.Xml;
  14 using System.Collections.Generic;
  15 using System.IO;
  16 using System.IO.Compression;
  17 using System.Runtime.InteropServices;
  18 using System.Text;
  19 using IKVM.Reflection;
  20
  21
  22 using System.Threading.Tasks;
  23
  24 class MakeBundle {
  25         static string output = "a.out";
  26         static string object_out = null;
  27         static List<string> link_paths = new List<string> ();
  28         static bool autodeps = false;
  29         static bool keeptemp = false;
  30         static bool compile_only = false;
  31         static bool static_link = false;
  32         static string config_file = null;
  33         static string machine_config_file = null;
  34         static string config_dir = null;
  35         static string style = "linux";
  36         static bool compress;
  37         static bool nomain;
  38         static bool? use_dos2unix = null;
  39         static bool skip_scan;
  40         static string ctor_func;
  41
  42         static int Main (string [] args)
  43         {
  44                 List<string> sources = new List<string> ();
  45                 int top = args.Length;
  46                 link_paths.Add (".");
  47
  48                 DetectOS ();
  49
  50                 for (int i = 0; i < top; i++){
  51                         switch (args [i]){
  52                         case "--help": case "-h": case "-?":
  53                                 Help ();
  54                                 return 1;
  55
  56                         case "-c":
  57                                 compile_only = true;
  58                                 break;
  59
  60                         case "-o":
  61                                 if (i+1 == top){
  62                                         Help ();
  63                                         return 1;
  64                                 }
  65                                 output = args [++i];
  66                                 break;
  67
  68                         case "-oo":
  69                                 if (i+1 == top){
  70                                         Help ();
  71                                         return 1;
  72                                 }
  73                                 object_out = args [++i];
  74                                 break;
  75
  76                         case "-L":
  77                                 if (i+1 == top){
  78                                         Help ();
  79                                         return 1;
  80                                 }
  81                                 link_paths.Add (args [++i]);
  82                                 break;
  83
  84                         case "--nodeps":
  85                                 autodeps = false;
  86                                 break;
  87
  88                         case "--deps":
  89                                 autodeps = true;
  90                                 break;
  91
  92                         case "--keeptemp":
  93                                 keeptemp = true;
  94                                 break;
  95                         case "--static":
  96                                 static_link = true;
  97                                 Console.WriteLine ("Note that statically linking the LGPL Mono runtime has more licensing restrictions than dynamically linking.");
  98                                 Console.WriteLine ("See http://www.mono-project.com/Licensing for details on licensing.");
  99                                 break;
 100                         case "--config":
 101                                 if (i+1 == top) {
 102                                         Help ();
 103                                         return 1;
 104                                 }
 105
 106                                 config_file = args [++i];
 107                                 break;
 108                         case "--machine-config":
 109                                 if (i+1 == top) {
 110                                         Help ();
 111                                         return 1;
 112                                 }
 113
 114                                 machine_config_file = args [++i];
 115
 116                                 Console.WriteLine ("WARNING:\n  Check that the machine.config file you are bundling\n  doesn't contain sensitive information specific to this machine.");
 117                                 break;
 118                         case "--config-dir":
 119                                 if (i+1 == top) {
 120                                         Help ();
 121                                         return 1;
 122                                 }
 123
 124                                 config_dir = args [++i];
 125                                 break;
 126                         case "-z":
 127                                 compress = true;
 128                                 break;
 129                         case "--nomain":
 130                                 nomain = true;
 131                                 break;
 132                         case "--style":
 133                                 if (i+1 == top) {
 134                                         Help ();
 135                                         return 1;
 136                                 }
 137                                 style = args [++i];
 138                                 switch (style) {
 139                                 case "windows":
 140                                 case "mac":
 141                                 case "linux":
 142                                         break;
 143                                 default:
 144                                         Console.Error.WriteLine ("Invalid style '{0}' - only 'windows', 'mac' and 'linux' are supported for --style argument", style);
 145                                         return 1;
 146                                 }
 147
 148                                 break;
 149                         case "--skip-scan":
 150                                 skip_scan = true;
 151                                 break;
 152                         case "--static-ctor":
 153                                 if (i+1 == top) {
 154                                         Help ();
 155                                         return 1;
 156                                 }
 157                                 ctor_func = args [++i];
 158                                 break;
 159                         case "--dos2unix":
 160                         case "--dos2unix=true":
 161                                 use_dos2unix = true;
 162                                 break;
 163                         case "--dos2unix=false":
 164                                 use_dos2unix = false;
 165                                 break;
 166                         default:
 167                                 sources.Add (args [i]);
 168                                 break;
 169                         }
 170
 171                         if (static_link && style == "windows") {
 172                                 Console.Error.WriteLine ("The option `{0}' is not supported on this platform.", args [i]);
 173                                 return 1;
 174                         }
 175                 }
 176
 177                 Console.WriteLine ("Sources: {0} Auto-dependencies: {1}", sources.Count, autodeps);
 178                 if (sources.Count == 0 || output == null) {
 179                         Help ();
 180                         Environment.Exit (1);
 181                 }
 182
 183                 List<string> assemblies = LoadAssemblies (sources);
 184                 List<string> files = new List<string> ();
 185                 foreach (string file in assemblies)
 186                         if (!QueueAssembly (files, file))
 187                                 return 1;
 188
 189                 GenerateBundles (files);
 190                 //GenerateJitWrapper ();
 191
 192                 return 0;
 193         }
 194
 195         static void WriteSymbol (StreamWriter sw, string name, long size)
 196         {
 197                 switch (style){
 198                 case "linux":
 199                         sw.WriteLine (
 200                                 ".globl {0}\n" +
 201                                 "\t.section .rodata\n" +
 202                                 "\t.p2align 5\n" +
 203                                 "\t.type {0}, \"object\"\n" +
 204                                 "\t.size {0}, {1}\n" +
 205                                 "{0}:\n",
 206                                 name, size);
 207                         break;
 208                 case "osx":
 209                         sw.WriteLine (
 210                                 "\t.section __TEXT,__text,regular,pure_instructions\n" +
 211                                 "\t.globl _{0}\n" +
 212                                 "\t.data\n" +
 213                                 "\t.align 4\n" +
 214                                 "_{0}:\n",
 215                                 name, size);
 216                         break;
 217                 case "windows":
 218                         sw.WriteLine (
 219                                 ".globl _{0}\n" +
 220                                 "\t.section .rdata,\"dr\"\n" +
 221                                 "\t.align 32\n" +
 222                                 "_{0}:\n",
 223                                 name, size);
 224                         break;
 225                 }
 226         }
 227
 228         static string [] chars = new string [256];
 229
 230         static void WriteBuffer (StreamWriter ts, Stream stream, byte[] buffer)
 231         {
 232                 int n;
 233
 234                 // Preallocate the strings we need.
 235                 if (chars [0] == null) {
 236                         for (int i = 0; i < chars.Length; i++)
 237                                 chars [i] = string.Format ("{0}", i.ToString ());
 238                 }
 239
 240                 while ((n = stream.Read (buffer, 0, buffer.Length)) != 0) {
 241                         int count = 0;
 242                         for (int i = 0; i < n; i++) {
 243                                 if (count % 32 == 0) {
 244                                         ts.Write ("\n\t.byte ");
 245                                 } else {
 246                                         ts.Write (",");
 247                                 }
 248                                 ts.Write (chars [buffer [i]]);
 249                                 count ++;
 250                         }
 251                 }
 252
 253                 ts.WriteLine ();
 254         }
 255
 256         static void GenerateBundles (List<string> files)
 257         {
 258                 string temp_s = "temp.s"; // Path.GetTempFileName ();
 259                 string temp_c = "temp.c";
 260                 string temp_o = "temp.o";
 261
 262                 if (compile_only)
 263                         temp_c = output;
 264                 if (object_out != null)
 265                         temp_o = object_out;
 266
 267                 try {
 268                         List<string> c_bundle_names = new List<string> ();
 269                         List<string[]> config_names = new List<string[]> ();
 270
 271                         using (StreamWriter ts = new StreamWriter (File.Create (temp_s))) {
 272                         using (StreamWriter tc = new StreamWriter (File.Create (temp_c))) {
 273                         string prog = null;
 274
 275 #if XAMARIN_ANDROID
 276                         tc.WriteLine ("/* This source code was produced by mkbundle, do not edit */");
 277                         tc.WriteLine ("\n#ifndef NULL\n#define NULL (void *)0\n#endif");
 278                         tc.WriteLine (@"
 279 typedef struct {
 280         const char *name;
 281         const unsigned char *data;
 282         const unsigned int size;
 283 } MonoBundledAssembly;
 284 void          mono_register_bundled_assemblies (const MonoBundledAssembly **assemblies);
 285 void          mono_register_config_for_assembly (const char* assembly_name, const char* config_xml);
 286 ");
 287 #else
 288                         tc.WriteLine ("#include <mono/metadata/mono-config.h>");
 289                         tc.WriteLine ("#include <mono/metadata/assembly.h>\n");
 290 #endif
 291
 292                         if (compress) {
 293                                 tc.WriteLine ("typedef struct _compressed_data {");
 294                                 tc.WriteLine ("\tMonoBundledAssembly assembly;");
 295                                 tc.WriteLine ("\tint compressed_size;");
 296                                 tc.WriteLine ("} CompressedAssembly;\n");
 297                         }
 298
 299                         object monitor = new object ();
 300
 301                         var streams = new Dictionary<string, Stream> ();
 302                         var sizes = new Dictionary<string, long> ();
 303
 304                         // Do the file reading and compression in parallel
 305                         Action<string> body = delegate (string url) {
 306                                 string fname = new Uri (url).LocalPath;
 307                                 Stream stream = File.OpenRead (fname);
 308
 309                                 long real_size = stream.Length;
 310                                 int n;
 311                                 if (compress) {
 312                                         byte[] cbuffer = new byte [8192];
 313                                         MemoryStream ms = new MemoryStream ();
 314                                         GZipStream deflate = new GZipStream (ms, CompressionMode.Compress, leaveOpen:true);
 315                                         while ((n = stream.Read (cbuffer, 0, cbuffer.Length)) != 0){
 316                                                 deflate.Write (cbuffer, 0, n);
 317                                         }
 318                                         stream.Close ();
 319                                         deflate.Close ();
 320                                         byte [] bytes = ms.GetBuffer ();
 321                                         stream = new MemoryStream (bytes, 0, (int) ms.Length, false, false);
 322                                 }
 323
 324                                 lock (monitor) {
 325                                         streams [url] = stream;
 326                                         sizes [url] = real_size;
 327                                 }
 328                         };
 329
 330                         //#if NET_4_5
 331 #if FALSE
 332                         Parallel.ForEach (files, body);
 333 #else
 334                         foreach (var url in files)
 335                                 body (url);
 336 #endif
 337
 338                         // The non-parallel part
 339                         byte [] buffer = new byte [8192];
 340                         foreach (var url in files) {
 341                                 string fname = new Uri (url).LocalPath;
 342                                 string aname = Path.GetFileName (fname);
 343                                 string encoded = aname.Replace ("-", "_").Replace (".", "_");
 344
 345                                 if (prog == null)
 346                                         prog = aname;
 347
 348                                 var stream = streams [url];
 349                                 var real_size = sizes [url];
 350
 351                                 Console.WriteLine ("   embedding: " + fname);
 352
 353                                 WriteSymbol (ts, "assembly_data_" + encoded, stream.Length);
 354
 355                                 WriteBuffer (ts, stream, buffer);
 356
 357                                 if (compress) {
 358                                         tc.WriteLine ("extern const unsigned char assembly_data_{0} [];", encoded);
 359                                         tc.WriteLine ("static CompressedAssembly assembly_bundle_{0} = {{{{\"{1}\"," +
 360                                                                   " assembly_data_{0}, {2}}}, {3}}};",
 361                                                                   encoded, aname, real_size, stream.Length);
 362                                         double ratio = ((double) stream.Length * 100) / real_size;
 363                                         Console.WriteLine ("   compression ratio: {0:.00}%", ratio);
 364                                 } else {
 365                                         tc.WriteLine ("extern const unsigned char assembly_data_{0} [];", encoded);
 366                                         tc.WriteLine ("static const MonoBundledAssembly assembly_bundle_{0} = {{\"{1}\", assembly_data_{0}, {2}}};",
 367                                                                   encoded, aname, real_size);
 368                                 }
 369                                 stream.Close ();
 370
 371                                 c_bundle_names.Add ("assembly_bundle_" + encoded);
 372
 373                                 try {
 374                                         FileStream cf = File.OpenRead (fname + ".config");
 375                                         Console.WriteLine (" config from: " + fname + ".config");
 376                                         tc.WriteLine ("extern const unsigned char assembly_config_{0} [];", encoded);
 377                                         WriteSymbol (ts, "assembly_config_" + encoded, cf.Length);
 378                                         WriteBuffer (ts, cf, buffer);
 379                                         ts.WriteLine ();
 380                                         config_names.Add (new string[] {aname, encoded});
 381                                 } catch (FileNotFoundException) {
 382                                         /* we ignore if the config file doesn't exist */
 383                                 }
 384                         }
 385
 386                         if (config_file != null){
 387                                 FileStream conf;
 388                                 try {
 389                                         conf = File.OpenRead (config_file);
 390                                 } catch {
 391                                         Error (String.Format ("Failure to open {0}", config_file));
 392                                         return;
 393                                 }
 394                                 Console.WriteLine ("System config from: " + config_file);
 395                                 tc.WriteLine ("extern const char system_config;");
 396                                 WriteSymbol (ts, "system_config", config_file.Length);
 397
 398                                 WriteBuffer (ts, conf, buffer);
 399                                 // null terminator
 400                                 ts.Write ("\t.byte 0\n");
 401                                 ts.WriteLine ();
 402                         }
 403
 404                         if (machine_config_file != null){
 405                                 FileStream conf;
 406                                 try {
 407                                         conf = File.OpenRead (machine_config_file);
 408                                 } catch {
 409                                         Error (String.Format ("Failure to open {0}", machine_config_file));
 410                                         return;
 411                                 }
 412                                 Console.WriteLine ("Machine config from: " + machine_config_file);
 413                                 tc.WriteLine ("extern const char machine_config;");
 414                                 WriteSymbol (ts, "machine_config", machine_config_file.Length);
 415
 416                                 WriteBuffer (ts, conf, buffer);
 417                                 ts.Write ("\t.byte 0\n");
 418                                 ts.WriteLine ();
 419                         }
 420                         ts.Close ();
 421
 422                         string assembler = GetEnv ("AS", IsUnix ? "as" : "i686-pc-mingw32-as");
 423
 424                         Console.WriteLine ("Compiling:");
 425                         string cmd = String.Format ("{0} -o {1} {2} ", assembler, temp_o, temp_s);
 426                         int ret = Execute (cmd);
 427                         if (ret != 0){
 428                                 Error ("[Fail]");
 429                                 return;
 430                         }
 431
 432                         if (compress)
 433                                 tc.WriteLine ("\nstatic const CompressedAssembly *compressed [] = {");
 434                         else
 435                                 tc.WriteLine ("\nstatic const MonoBundledAssembly *bundled [] = {");
 436
 437                         foreach (string c in c_bundle_names){
 438                                 tc.WriteLine ("\t&{0},", c);
 439                         }
 440                         tc.WriteLine ("\tNULL\n};\n");
 441                         tc.WriteLine ("static char *image_name = \"{0}\";", prog);
 442
 443                         if (ctor_func != null) {
 444                                 tc.WriteLine ("\nextern void {0} (void);", ctor_func);
 445                                 tc.WriteLine ("\n__attribute__ ((constructor)) static void mono_mkbundle_ctor (void)");
 446                                 tc.WriteLine ("{{\n\t{0} ();\n}}", ctor_func);
 447                         }
 448
 449                         tc.WriteLine ("\nstatic void install_dll_config_files (void) {\n");
 450                         foreach (string[] ass in config_names){
 451                                 tc.WriteLine ("\tmono_register_config_for_assembly (\"{0}\", assembly_config_{1});\n", ass [0], ass [1]);
 452                         }
 453                         if (config_file != null)
 454                                 tc.WriteLine ("\tmono_config_parse_memory (&system_config);\n");
 455                         if (machine_config_file != null)
 456                                 tc.WriteLine ("\tmono_register_machine_config (&machine_config);\n");
 457                         tc.WriteLine ("}\n");
 458
 459                         if (config_dir != null)
 460                                 tc.WriteLine ("static const char *config_dir = \"{0}\";", config_dir);
 461                         else
 462                                 tc.WriteLine ("static const char *config_dir = NULL;");
 463
 464                         Stream template_stream;
 465                         if (compress) {
 466                                 template_stream = System.Reflection.Assembly.GetAssembly (typeof(MakeBundle)).GetManifestResourceStream ("template_z.c");
 467                         } else {
 468                                 template_stream = System.Reflection.Assembly.GetAssembly (typeof(MakeBundle)).GetManifestResourceStream ("template.c");
 469                         }
 470
 471                         StreamReader s = new StreamReader (template_stream);
 472                         string template = s.ReadToEnd ();
 473                         tc.Write (template);
 474
 475                         if (!nomain) {
 476                                 Stream template_main_stream = System.Reflection.Assembly.GetAssembly (typeof(MakeBundle)).GetManifestResourceStream ("template_main.c");
 477                                 StreamReader st = new StreamReader (template_main_stream);
 478                                 string maintemplate = st.ReadToEnd ();
 479                                 tc.Write (maintemplate);
 480                         }
 481
 482                         tc.Close ();
 483
 484                         if (compile_only)
 485                                 return;
 486
 487                         string zlib = (compress ? "-lz" : "");
 488                         string debugging = "-g";
 489                         string cc = GetEnv ("CC", IsUnix ? "cc" : "i686-pc-mingw32-gcc");
 490
 491                         if (style == "linux")
 492                                 debugging = "-ggdb";
 493                         if (static_link) {
 494                                 string smonolib;
 495                                 if (style == "osx")
 496                                         smonolib = "`pkg-config --variable=libdir mono-2`/libmono-2.0.a ";
 497                                 else
 498                                         smonolib = "-Wl,-Bstatic -lmono-2.0 -Wl,-Bdynamic ";
 499                                 cmd = String.Format ("{4} -o {2} -Wall `pkg-config --cflags mono-2` {0} {3} " +
 500                                                      "`pkg-config --libs-only-L mono-2` " + smonolib +
 501                                                      "`pkg-config --libs-only-l mono-2 | sed -e \"s/\\-lmono-2.0 //\"` {1}",
 502                                                      temp_c, temp_o, output, zlib, cc);
 503                         } else {
 504
 505                                 cmd = String.Format ("{4} " + debugging + " -o {2} -Wall {0} `pkg-config --cflags --libs mono-2` {3} {1}",
 506                                                      temp_c, temp_o, output, zlib, cc);
 507                         }
 508
 509                         ret = Execute (cmd);
 510                         if (ret != 0){
 511                                 Error ("[Fail]");
 512                                 return;
 513                         }
 514                         Console.WriteLine ("Done");
 515                         }
 516                         }
 517                 } finally {
 518                         if (!keeptemp){
 519                                 if (object_out == null){
 520                                         File.Delete (temp_o);
 521                                 }
 522                                 if (!compile_only){
 523                                         File.Delete (temp_c);
 524                                 }
 525                                 File.Delete (temp_s);
 526                         }
 527                 }
 528         }
 529
 530         static List<string> LoadAssemblies (List<string> sources)
 531         {
 532                 List<string> assemblies = new List<string> ();
 533                 bool error = false;
 534
 535                 foreach (string name in sources){
 536                         try {
 537                                 Assembly a = LoadAssembly (name);
 538
 539                                 if (a == null){
 540                                         error = true;
 541                                         continue;
 542                                 }
 543
 544                                 assemblies.Add (a.CodeBase);
 545                         } catch (Exception e) {
 546                                 if (skip_scan) {
 547                                         Console.WriteLine ("File will not be scanned: {0}", name);
 548                                         assemblies.Add (new Uri (new FileInfo (name).FullName).ToString ());
 549                                 } else {
 550                                         throw;
 551                                 }
 552                         }
 553                 }
 554
 555                 if (error)
 556                         Environment.Exit (1);
 557
 558                 return assemblies;
 559         }
 560
 561         static readonly Universe universe = new Universe ();
 562         static readonly Dictionary<string, string> loaded_assemblies = new Dictionary<string, string> ();
 563
 564         static bool QueueAssembly (List<string> files, string codebase)
 565         {
 566                 // Console.WriteLine ("CODE BASE IS {0}", codebase);
 567                 if (files.Contains (codebase))
 568                         return true;
 569
 570                 var path = new Uri(codebase).LocalPath;
 571                 var name = Path.GetFileName (path);
 572                 string found;
 573                 if (loaded_assemblies.TryGetValue (name, out found)) {
 574                         Error (string.Format ("Duplicate assembly name `{0}'. Both `{1}' and `{2}' use same assembly name.", name, path, found));
 575                         return false;
 576                 }
 577
 578                 loaded_assemblies.Add (name, path);
 579
 580                 files.Add (codebase);
 581                 if (!autodeps)
 582                         return true;
 583                 try {
 584                         Assembly a = universe.LoadFile (path);
 585
 586                         foreach (AssemblyName an in a.GetReferencedAssemblies ()) {
 587                                 a = universe.Load (an.FullName);
 588                                 if (!QueueAssembly (files, a.CodeBase))
 589                                         return false;
 590                         }
 591                 } catch (Exception e) {
 592                         if (!skip_scan)
 593                                 throw;
 594                 }
 595
 596                 return true;
 597         }
 598
 599         static Assembly LoadAssembly (string assembly)
 600         {
 601                 Assembly a;
 602
 603                 try {
 604                         char[] path_chars = { '/', '\\' };
 605
 606                         if (assembly.IndexOfAny (path_chars) != -1) {
 607                                 a = universe.LoadFile (assembly);
 608                         } else {
 609                                 string ass = assembly;
 610                                 if (ass.EndsWith (".dll"))
 611                                         ass = assembly.Substring (0, assembly.Length - 4);
 612                                 a = universe.Load (ass);
 613                         }
 614                         return a;
 615                 } catch (FileNotFoundException){
 616                         string total_log = "";
 617
 618                         foreach (string dir in link_paths){
 619                                 string full_path = Path.Combine (dir, assembly);
 620                                 if (!assembly.EndsWith (".dll") && !assembly.EndsWith (".exe"))
 621                                         full_path += ".dll";
 622
 623                                 try {
 624                                         a = universe.LoadFile (full_path);
 625                                         return a;
 626                                 } catch (FileNotFoundException ff) {
 627                                         total_log += ff.FusionLog;
 628                                         continue;
 629                                 }
 630                         }
 631                         Error ("Cannot find assembly `" + assembly + "'" );
 632                         Console.WriteLine ("Log: \n" + total_log);
 633                 } catch (IKVM.Reflection.BadImageFormatException f) {
 634                         if (skip_scan)
 635                                 throw;
 636                         Error ("Cannot load assembly (bad file format) " + f.Message);
 637                 } catch (FileLoadException f){
 638                         Error ("Cannot load assembly " + f.Message);
 639                 } catch (ArgumentNullException){
 640                         Error("Cannot load assembly (null argument)");
 641                 }
 642                 return null;
 643         }
 644
 645         static void Error (string msg)
 646         {
 647                 Console.Error.WriteLine ("ERROR: " + msg);
 648                 Environment.Exit (1);
 649         }
 650
 651         static void Help ()
 652         {
 653                 Console.WriteLine ("Usage is: mkbundle [options] assembly1 [assembly2...]\n\n" +
 654                                    "Options:\n" +
 655                                    "    -c                  Produce stub only, do not compile\n" +
 656                                    "    -o out              Specifies output filename\n" +
 657                                    "    -oo obj             Specifies output filename for helper object file\n" +
 658                                    "    -L path             Adds `path' to the search path for assemblies\n" +
 659                                    "    --nodeps            Turns off automatic dependency embedding (default)\n" +
 660                                    "    --deps              Turns on automatic dependency embedding\n" +
 661                                    "    --dos2unix[=true|false]\n" +
 662                                    "                        When no value provided, or when `true` specified\n" +
 663                                    "                        `dos2unix` will be invoked to convert paths on Windows.\n" +
 664                                    "                        When `--dos2unix=false` used, dos2unix is NEVER used.\n" +
 665                                    "    --keeptemp          Keeps the temporary files\n" +
 666                                    "    --config F          Bundle system config file `F'\n" +
 667                                    "    --config-dir D      Set MONO_CFG_DIR to `D'\n" +
 668                                    "    --machine-config F  Use the given file as the machine.config for the application.\n" +
 669                                    "    --static            Statically link to mono libs\n" +
 670                                    "    --nomain            Don't include a main() function, for libraries\n" +
 671                                    "    -z                  Compress the assemblies before embedding.\n" +
 672                                    "    --skip-scan         Skip scanning assemblies that could not be loaded (but still embed them).\n" +
 673                                    "    --static-ctor ctor  Add a constructor call to the supplied function.\n" +
 674                                    "                        You need zlib development headers and libraries.\n");
 675         }
 676
 677         [DllImport ("libc")]
 678         static extern int system (string s);
 679         [DllImport ("libc")]
 680         static extern int uname (IntPtr buf);
 681
 682         static void DetectOS ()
 683         {
 684                 if (!IsUnix) {
 685                         Console.WriteLine ("OS is: Windows");
 686                         style = "windows";
 687                         return;
 688                 }
 689
 690                 IntPtr buf = Marshal.AllocHGlobal (8192);
 691                 if (uname (buf) != 0){
 692                         Console.WriteLine ("Warning: Unable to detect OS");
 693                         Marshal.FreeHGlobal (buf);
 694                         return;
 695                 }
 696                 string os = Marshal.PtrToStringAnsi (buf);
 697                 Console.WriteLine ("OS is: " + os);
 698                 if (os == "Darwin")
 699                         style = "osx";
 700
 701                 Marshal.FreeHGlobal (buf);
 702         }
 703
 704         static bool IsUnix {
 705                 get {
 706                         int p = (int) Environment.OSVersion.Platform;
 707                         return ((p == 4) || (p == 128) || (p == 6));
 708                 }
 709         }
 710
 711         static int Execute (string cmdLine)
 712         {
 713                 if (IsUnix) {
 714                         Console.WriteLine (cmdLine);
 715                         return system (cmdLine);
 716                 }
 717
 718                 // on Windows, we have to pipe the output of a
 719                 // `cmd` interpolation to dos2unix, because the shell does not
 720                 // strip the CRLFs generated by the native pkg-config distributed
 721                 // with Mono.
 722                 //
 723                 // But if it's *not* on cygwin, just skip it.
 724
 725                 // check if dos2unix is applicable.
 726                 if (use_dos2unix == null) {
 727                         use_dos2unix = false;
 728                         try {
 729                                 var info = new ProcessStartInfo ("dos2unix");
 730                                 info.CreateNoWindow = true;
 731                                 info.RedirectStandardInput = true;
 732                                 info.UseShellExecute = false;
 733                                 var dos2unix = Process.Start (info);
 734                                 dos2unix.StandardInput.WriteLine ("aaa");
 735                                 dos2unix.StandardInput.WriteLine ("\u0004");
 736                                 dos2unix.StandardInput.Close ();
 737                                 dos2unix.WaitForExit ();
 738                                 if (dos2unix.ExitCode == 0)
 739                                         use_dos2unix = true;
 740                         } catch {
 741                                 // ignore
 742                         }
 743                 }
 744                 // and if there is no dos2unix, just run cmd /c.
 745                 if (use_dos2unix == false) {
 746                         Console.WriteLine (cmdLine);
 747                         ProcessStartInfo dos2unix = new ProcessStartInfo ();
 748                         dos2unix.UseShellExecute = false;
 749                         dos2unix.FileName = "cmd";
 750                         dos2unix.Arguments = String.Format ("/c \"{0}\"", cmdLine);
 751
 752                         using (Process p = Process.Start (dos2unix)) {
 753                                 p.WaitForExit ();
 754                                 return p.ExitCode;
 755                         }
 756                 }
 757
 758                 StringBuilder b = new StringBuilder ();
 759                 int count = 0;
 760                 for (int i = 0; i < cmdLine.Length; i++) {
 761                         if (cmdLine [i] == '`') {
 762                                 if (count % 2 != 0) {
 763                                         b.Append ("|dos2unix");
 764                                 }
 765                                 count++;
 766                         }
 767                         b.Append (cmdLine [i]);
 768                 }
 769                 cmdLine = b.ToString ();
 770                 Console.WriteLine (cmdLine);
 771
 772                 ProcessStartInfo psi = new ProcessStartInfo ();
 773                 psi.UseShellExecute = false;
 774                 psi.FileName = "sh";
 775                 psi.Arguments = String.Format ("-c \"{0}\"", cmdLine);
 776
 777                 using (Process p = Process.Start (psi)) {
 778                         p.WaitForExit ();
 779                         return p.ExitCode;
 780                 }
 781         }
 782
 783         static string GetEnv (string name, string defaultValue)
 784         {
 785                 string s = Environment.GetEnvironmentVariable (name);
 786                 return s != null ? s : defaultValue;
 787         }
 788 }