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