gcc/fortran/gfortranspec.c

   1 /* Specific flags and argument handling of the Fortran front-end.
   2    Copyright (C) 1997, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
   3    2007, 2008, 2009, 2010
   4    Free Software Foundation, Inc.
   5
   6 This file is part of GCC.
   7
   8 GNU CC is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 3, or (at your option)
  11 any later version.
  12
  13 GNU CC is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 /* This file is copied more or less verbatim from g77.  */
  23 /* This file contains a filter for the main `gcc' driver, which is
  24    replicated for the `gfortran' driver by adding this filter.  The purpose
  25    of this filter is to be basically identical to gcc (in that
  26    it faithfully passes all of the original arguments to gcc) but,
  27    unless explicitly overridden by the user in certain ways, ensure
  28    that the needs of the language supported by this wrapper are met.
  29
  30    For GNU Fortran 95(gfortran), we do the following to the argument list
  31    before passing it to `gcc':
  32
  33    1.  Make sure `-lgfortran -lm' is at the end of the list.
  34
  35    2.  Make sure each time `-lgfortran' or `-lm' is seen, it forms
  36        part of the series `-lgfortran -lm'.
  37
  38    #1 and #2 are not done if `-nostdlib' or any option that disables
  39    the linking phase is present, or if `-xfoo' is in effect.  Note that
  40    a lack of source files or -l options disables linking.
  41
  42    This program was originally made out of gcc/cp/g++spec.c, but the
  43    way it builds the new argument list was rewritten so it is much
  44    easier to maintain, improve the way it decides to add or not add
  45    extra arguments, etc.  And several improvements were made in the
  46    handling of arguments, primarily to make it more consistent with
  47    `gcc' itself.  */
  48
  49 #include "config.h"
  50 #include "system.h"
  51 #include "gcc.h"
  52
  53 #include "coretypes.h"
  54 #include "tm.h"
  55 #include "intl.h"
  56
  57 #ifndef MATH_LIBRARY
  58 #define MATH_LIBRARY "-lm"
  59 #endif
  60
  61 #ifndef FORTRAN_LIBRARY
  62 #define FORTRAN_LIBRARY "-lgfortran"
  63 #endif
  64
  65 #ifdef HAVE_LD_STATIC_DYNAMIC
  66 #define ADD_ARG_LIBGFORTRAN(arg) \
  67   { \
  68     if (static_lib && !static_linking) \
  69       append_arg ("-Wl,-Bstatic"); \
  70     append_arg (arg); \
  71     if (static_lib && !static_linking) \
  72       append_arg ("-Wl,-Bdynamic"); \
  73   }
  74 #else
  75 #define ADD_ARG_LIBGFORTRAN(arg) append_arg (arg);
  76 #endif
  77
  78
  79 /* Options this driver needs to recognize, not just know how to
  80    skip over.  */
  81 typedef enum
  82 {
  83   OPTION_b,                     /* Aka --prefix.  */
  84   OPTION_B,                     /* Aka --target.  */
  85   OPTION_c,                     /* Aka --compile.  */
  86   OPTION_E,                     /* Aka --preprocess.  */
  87   OPTION_help,                  /* --help.  */
  88   OPTION_i,                     /* -imacros, -include, -include-*.  */
  89   OPTION_l,
  90   OPTION_L,                     /* Aka --library-directory.  */
  91   OPTION_nostdlib,              /* Aka --no-standard-libraries, or
  92                                    -nodefaultlibs.  */
  93   OPTION_o,                     /* Aka --output.  */
  94   OPTION_S,                     /* Aka --assemble.  */
  95   OPTION_static,                /* -static.  */
  96   OPTION_static_libgfortran,    /* -static-libgfortran.  */
  97   OPTION_syntax_only,           /* -fsyntax-only.  */
  98   OPTION_v,                     /* Aka --verbose.  */
  99   OPTION_version,               /* --version.  */
 100   OPTION_V,                     /* Aka --use-version.  */
 101   OPTION_x,                     /* Aka --language.  */
 102   OPTION_                       /* Unrecognized or unimportant.  */
 103 }
 104 Option;
 105
 106 /* The original argument list and related info is copied here.  */
 107 static int g77_xargc;
 108 static const char *const *g77_xargv;
 109 static void lookup_option (Option *, int *, const char **, const char *);
 110 static void append_arg (const char *);
 111
 112 /* The new argument list will be built here.  */
 113 static int g77_newargc;
 114 static const char **g77_newargv;
 115
 116 /* --- This comes from gcc.c (2.8.1) verbatim: */
 117
 118 /* This defines which switch letters take arguments.  */
 119
 120 #ifndef SWITCH_TAKES_ARG
 121 #define SWITCH_TAKES_ARG(CHAR) DEFAULT_SWITCH_TAKES_ARG(CHAR)
 122 #endif
 123
 124 /* This defines which multi-letter switches take arguments.  */
 125
 126 #ifndef WORD_SWITCH_TAKES_ARG
 127 #define WORD_SWITCH_TAKES_ARG(STR) DEFAULT_WORD_SWITCH_TAKES_ARG (STR)
 128 #endif
 129
 130 /* --- End of verbatim.  */
 131
 132 /* Assumes text[0] == '-'.  Returns number of argv items that belong to
 133    (and follow) this one, an option id for options important to the
 134    caller, and a pointer to the first char of the arg, if embedded (else
 135    returns NULL, meaning no arg or it's the next argv).
 136
 137    Note that this also assumes gcc.c's pass converting long options
 138    to short ones, where available, has already been run.  */
 139
 140 static void
 141 lookup_option (Option *xopt, int *xskip, const char **xarg, const char *text)
 142 {
 143   Option opt = OPTION_;
 144   int skip;
 145   const char *arg = NULL;
 146
 147   if ((skip = SWITCH_TAKES_ARG (text[1])))
 148     skip -= (text[2] != '\0');  /* See gcc.c.  */
 149
 150   if (text[1] == 'B')
 151     opt = OPTION_B, skip = (text[2] == '\0'), arg = text + 2;
 152   else if (text[1] == 'b')
 153     opt = OPTION_b, skip = (text[2] == '\0'), arg = text + 2;
 154   else if ((text[1] == 'c') && (text[2] == '\0'))
 155     opt = OPTION_c, skip = 0;
 156   else if ((text[1] == 'E') && (text[2] == '\0'))
 157     opt = OPTION_E, skip = 0;
 158   else if (text[1] == 'i')
 159     opt = OPTION_i, skip = 0;
 160   else if (text[1] == 'l')
 161     opt = OPTION_l;
 162   else if (text[1] == 'L')
 163     opt = OPTION_L, arg = text + 2;
 164   else if (text[1] == 'o')
 165     opt = OPTION_o;
 166   else if ((text[1] == 'S') && (text[2] == '\0'))
 167     opt = OPTION_S, skip = 0;
 168   else if (text[1] == 'V')
 169     opt = OPTION_V, skip = (text[2] == '\0');
 170   else if ((text[1] == 'v') && (text[2] == '\0'))
 171     opt = OPTION_v, skip = 0;
 172   else if (text[1] == 'x')
 173     opt = OPTION_x, arg = text + 2;
 174   else if (text[1] == 'J')
 175     ;
 176   else
 177     {
 178       if ((skip = WORD_SWITCH_TAKES_ARG (text + 1)) != 0)  /* See gcc.c.  */
 179         ;
 180       else if (!strcmp (text, "-fhelp"))        /* Really --help!! */
 181         opt = OPTION_help;
 182       else if (!strcmp (text, "-nostdlib")
 183                || !strcmp (text, "-nodefaultlibs"))
 184         opt = OPTION_nostdlib;
 185       else if (!strcmp (text, "-fsyntax-only"))
 186         opt = OPTION_syntax_only;
 187       else if (!strcmp (text, "-static-libgfortran"))
 188         opt = OPTION_static_libgfortran;
 189       else if (!strcmp (text, "-static"))
 190         opt = OPTION_static;
 191       else if (!strcmp (text, "-fversion"))     /* Really --version!! */
 192         opt = OPTION_version;
 193       else if (!strcmp (text, "-Xlinker") || !strcmp (text, "-specs"))
 194         skip = 1;
 195       else
 196         skip = 0;
 197     }
 198
 199   if (xopt != NULL)
 200     *xopt = opt;
 201   if (xskip != NULL)
 202     *xskip = skip;
 203   if (xarg != NULL)
 204     {
 205       if ((arg != NULL) && (arg[0] == '\0'))
 206         *xarg = NULL;
 207       else
 208         *xarg = arg;
 209     }
 210 }
 211
 212 /* Append another argument to the list being built.  As long as it is
 213    identical to the corresponding arg in the original list, just increment
 214    the new arg count.  Otherwise allocate a new list, etc.  */
 215
 216 static void
 217 append_arg (const char *arg)
 218 {
 219   static int newargsize;
 220
 221 #if 0
 222   fprintf (stderr, "`%s'\n", arg);
 223 #endif
 224
 225   if (g77_newargv == g77_xargv
 226       && g77_newargc < g77_xargc
 227       && (arg == g77_xargv[g77_newargc]
 228           || !strcmp (arg, g77_xargv[g77_newargc])))
 229     {
 230       ++g77_newargc;
 231       return;                   /* Nothing new here.  */
 232     }
 233
 234   if (g77_newargv == g77_xargv)
 235     {                           /* Make new arglist.  */
 236       int i;
 237
 238       newargsize = (g77_xargc << 2) + 20;       /* This should handle all.  */
 239       g77_newargv = (const char **) xmalloc (newargsize * sizeof (char *));
 240
 241       /* Copy what has been done so far.  */
 242       for (i = 0; i < g77_newargc; ++i)
 243         g77_newargv[i] = g77_xargv[i];
 244     }
 245
 246   if (g77_newargc == newargsize)
 247     fatal ("overflowed output arg list for '%s'", arg);
 248
 249   g77_newargv[g77_newargc++] = arg;
 250 }
 251
 252 void
 253 lang_specific_driver (int *in_argc, const char *const **in_argv,
 254                       int *in_added_libraries ATTRIBUTE_UNUSED)
 255 {
 256   int argc = *in_argc;
 257   const char *const *argv = *in_argv;
 258   int i;
 259   int verbose = 0;
 260   Option opt;
 261   int skip;
 262   const char *arg;
 263
 264   /* This will be NULL if we encounter a situation where we should not
 265      link in libf2c.  */
 266   const char *library = FORTRAN_LIBRARY;
 267
 268   /* 0 => -xnone in effect.
 269      1 => -xfoo in effect.  */
 270   int saw_speclang = 0;
 271
 272   /* 0 => initial/reset state
 273      1 => last arg was -l<library>
 274      2 => last two args were -l<library> -lm.  */
 275   int saw_library = 0;
 276
 277   /* By default, we throw on the math library if we have one.  */
 278   int need_math = (MATH_LIBRARY[0] != '\0');
 279
 280 #ifdef HAVE_LD_STATIC_DYNAMIC
 281   /* Whether we should link a static libgfortran. */
 282   int static_lib = 0;
 283
 284   /* Whether we need to link statically.  */
 285   int static_linking = 0;
 286 #endif
 287
 288   /* The number of input and output files in the incoming arg list.  */
 289   int n_infiles = 0;
 290   int n_outfiles = 0;
 291
 292 #if 0
 293   fprintf (stderr, "Incoming:");
 294   for (i = 0; i < argc; i++)
 295     fprintf (stderr, " %s", argv[i]);
 296   fprintf (stderr, "\n");
 297 #endif
 298
 299   g77_xargc = argc;
 300   g77_xargv = argv;
 301   g77_newargc = 0;
 302   g77_newargv = CONST_CAST2 (const char **, const char *const *, argv);
 303
 304   /* First pass through arglist.
 305
 306      If -nostdlib or a "turn-off-linking" option is anywhere in the
 307      command line, don't do any library-option processing (except
 308      relating to -x).  Also, if -v is specified, but no other options
 309      that do anything special (allowing -V version, etc.), remember
 310      to add special stuff to make gcc command actually invoke all
 311      the different phases of the compilation process so all the version
 312      numbers can be seen.
 313
 314      Also, here is where all problems with missing arguments to options
 315      are caught.  If this loop is exited normally, it means all options
 316      have the appropriate number of arguments as far as the rest of this
 317      program is concerned.  */
 318
 319   for (i = 1; i < argc; ++i)
 320     {
 321       if ((argv[i][0] == '+') && (argv[i][1] == 'e'))
 322         {
 323           continue;
 324         }
 325
 326       if ((argv[i][0] != '-') || (argv[i][1] == '\0'))
 327         {
 328           ++n_infiles;
 329           continue;
 330         }
 331
 332       lookup_option (&opt, &skip, NULL, argv[i]);
 333
 334       switch (opt)
 335         {
 336         case OPTION_nostdlib:
 337         case OPTION_c:
 338         case OPTION_S:
 339         case OPTION_syntax_only:
 340         case OPTION_E:
 341           /* These options disable linking entirely or linking of the
 342              standard libraries.  */
 343           library = 0;
 344           break;
 345
 346         case OPTION_static_libgfortran:
 347 #ifdef HAVE_LD_STATIC_DYNAMIC
 348           static_lib = 1;
 349 #endif
 350           break;
 351
 352         case OPTION_static:
 353 #ifdef HAVE_LD_STATIC_DYNAMIC
 354           static_linking = 1;
 355 #endif
 356           break;
 357
 358         case OPTION_l:
 359           ++n_infiles;
 360           break;
 361
 362         case OPTION_o:
 363           ++n_outfiles;
 364           break;
 365
 366         case OPTION_v:
 367           verbose = 1;
 368           break;
 369
 370         case OPTION_b:
 371         case OPTION_B:
 372         case OPTION_L:
 373         case OPTION_i:
 374         case OPTION_V:
 375           /* These options are useful in conjunction with -v to get
 376              appropriate version info.  */
 377           break;
 378
 379         case OPTION_version:
 380           printf ("GNU Fortran %s%s\n", pkgversion_string, version_string);
 381           printf ("Copyright %s 2010 Free Software Foundation, Inc.\n\n",
 382                   _("(C)"));
 383           printf (_("GNU Fortran comes with NO WARRANTY, to the extent permitted by law.\n\
 384 You may redistribute copies of GNU Fortran\n\
 385 under the terms of the GNU General Public License.\n\
 386 For more information about these matters, see the file named COPYING\n\n"));
 387           exit (0);
 388           break;
 389
 390         case OPTION_help:
 391           /* Let gcc.c handle this, as it has a really
 392              cool facility for handling --help and --verbose --help.  */
 393           return;
 394
 395         default:
 396           break;
 397         }
 398
 399       /* This is the one place we check for missing arguments in the
 400          program.  */
 401
 402       if (i + skip < argc)
 403         i += skip;
 404       else
 405         fatal ("argument to '%s' missing", argv[i]);
 406     }
 407
 408   if ((n_outfiles != 0) && (n_infiles == 0))
 409     fatal ("no input files; unwilling to write output files");
 410
 411   /* If there are no input files, no need for the library.  */
 412   if (n_infiles == 0)
 413     library = 0;
 414
 415   /* Second pass through arglist, transforming arguments as appropriate.  */
 416
 417   append_arg (argv[0]);         /* Start with command name, of course.  */
 418
 419   for (i = 1; i < argc; ++i)
 420     {
 421       if (argv[i][0] == '\0')
 422         {
 423           append_arg (argv[i]); /* Interesting.  Just append as is.  */
 424           continue;
 425         }
 426
 427       if ((argv[i][0] == '-') && (argv[i][1] == 'M'))
 428         {
 429           char *p;
 430
 431           fprintf (stderr, _("Warning: Using -M <directory> is deprecated, "
 432                    "use -J instead\n"));
 433           if (argv[i][2] == '\0')
 434             {
 435               if (i+1 < argc)
 436                 {
 437                   p = XNEWVEC (char, strlen (argv[i + 1]) + 3);
 438                   p[0] = '-';
 439                   p[1] = 'J';
 440                   strcpy (&p[2], argv[i + 1]);
 441                   i++;
 442                 }
 443               else
 444                 fatal ("argument to '%s' missing", argv[i]);
 445             }
 446           else
 447             {
 448               p = XNEWVEC (char, strlen (argv[i]) + 1);
 449               p[0] = '-';
 450               p[1] = 'J';
 451               strcpy (&p[2], argv[i] + 2);
 452             }
 453           append_arg (p);
 454           continue;
 455         }
 456
 457       if ((argv[i][0] == '-') && (argv[i][1] != 'l'))
 458         {
 459           /* Not a filename or library.  */
 460
 461           if (saw_library == 1 && need_math)    /* -l<library>.  */
 462             append_arg (MATH_LIBRARY);
 463
 464           saw_library = 0;
 465
 466           lookup_option (&opt, &skip, &arg, argv[i]);
 467
 468           if (argv[i][1] == '\0')
 469             {
 470               append_arg (argv[i]);     /* "-" == Standard input.  */
 471               continue;
 472             }
 473
 474           if (opt == OPTION_x)
 475             {
 476               /* Track input language.  */
 477               const char *lang;
 478
 479               if (arg == NULL)
 480                 lang = argv[i + 1];
 481               else
 482                 lang = arg;
 483
 484               saw_speclang = (strcmp (lang, "none") != 0);
 485             }
 486
 487           append_arg (argv[i]);
 488
 489           for (; skip != 0; --skip)
 490             append_arg (argv[++i]);
 491
 492           continue;
 493         }
 494
 495       /* A filename/library, not an option.  */
 496
 497       if (saw_speclang)
 498         saw_library = 0;        /* -xfoo currently active.  */
 499       else
 500         {                       /* -lfoo or filename.  */
 501           if (strcmp (argv[i], MATH_LIBRARY) == 0)
 502             {
 503               if (saw_library == 1)
 504                 saw_library = 2;        /* -l<library> -lm.  */
 505               else
 506                 {
 507                   ADD_ARG_LIBGFORTRAN (FORTRAN_LIBRARY);
 508                 }
 509             }
 510           else if (strcmp (argv[i], FORTRAN_LIBRARY) == 0)
 511             {
 512               saw_library = 1;  /* -l<library>.  */
 513               ADD_ARG_LIBGFORTRAN (argv[i]);
 514               continue;
 515             }
 516           else
 517             {                   /* Other library, or filename.  */
 518               if (saw_library == 1 && need_math)
 519                 append_arg (MATH_LIBRARY);
 520               saw_library = 0;
 521             }
 522         }
 523       append_arg (argv[i]);
 524     }
 525
 526   /* Append `-lg2c -lm' as necessary.  */
 527
 528   if (library)
 529     {                           /* Doing a link and no -nostdlib.  */
 530       if (saw_speclang)
 531         append_arg ("-xnone");
 532
 533       switch (saw_library)
 534         {
 535         case 0:
 536           ADD_ARG_LIBGFORTRAN (library);
 537           /* Fall through.  */
 538
 539         case 1:
 540           if (need_math)
 541             append_arg (MATH_LIBRARY);
 542         default:
 543           break;
 544         }
 545     }
 546
 547 #ifdef ENABLE_SHARED_LIBGCC
 548   if (library)
 549     {
 550       int i;
 551
 552       for (i = 1; i < g77_newargc; i++)
 553         if (g77_newargv[i][0] == '-')
 554           if (strcmp (g77_newargv[i], "-static-libgcc") == 0
 555               || strcmp (g77_newargv[i], "-static") == 0)
 556             break;
 557
 558       if (i == g77_newargc)
 559         append_arg ("-shared-libgcc");
 560     }
 561
 562 #endif
 563
 564   if (verbose && g77_newargv != g77_xargv)
 565     {
 566       fprintf (stderr, _("Driving:"));
 567       for (i = 0; i < g77_newargc; i++)
 568         fprintf (stderr, " %s", g77_newargv[i]);
 569       fprintf (stderr, "\n");
 570     }
 571
 572   *in_argc = g77_newargc;
 573   *in_argv = g77_newargv;
 574 }
 575
 576
 577 /* Called before linking.  Returns 0 on success and -1 on failure.  */
 578 int
 579 lang_specific_pre_link (void)   /* Not used for F77.  */
 580 {
 581   return 0;
 582 }
 583
 584 /* Number of extra output files that lang_specific_pre_link may generate.  */
 585 int lang_specific_extra_outfiles = 0;   /* Not used for F77.  */