ld/lexsup.c

   1 /* Parse options for the GNU linker.
   2    Copyright (C) 1991, 92, 93, 94, 95, 1996 Free Software Foundation, Inc.
   3
   4 This file is part of GLD, the Gnu Linker.
   5
   6 GLD is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GLD is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GLD; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  19
  20 #include "bfd.h"
  21 #include "sysdep.h"
  22 #include <stdio.h>
  23 #include <string.h>
  24 #include <ctype.h>
  25 #include "getopt.h"
  26 #include "bfdlink.h"
  27 #include "ld.h"
  28 #include "ldmain.h"
  29 #include "ldmisc.h"
  30 #include "ldexp.h"
  31 #include "ldlang.h"
  32 #include "ldgram.h"
  33 #include "ldlex.h"
  34 #include "ldfile.h"
  35 #include "ldver.h"
  36 #include "ldemul.h"
  37
  38 /* Somewhere above, sys/stat.h got included . . . . */
  39 #if !defined(S_ISDIR) && defined(S_IFDIR)
  40 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
  41 #endif
  42
  43 /* Omit args to avoid the possibility of clashing with a system header
  44    that might disagree about consts.  */
  45 unsigned long strtoul ();
  46
  47 static void set_default_dirlist PARAMS ((char *dirlist_ptr));
  48 static void set_section_start PARAMS ((char *sect, char *valstr));
  49
  50 /* Non-zero if we are processing a --defsym from the command line.  */
  51 int parsing_defsym = 0;
  52
  53 void
  54 parse_args (argc, argv)
  55      int argc;
  56      char **argv;
  57 {
  58   int i;
  59   int ingroup = 0;
  60   char *default_dirlist = NULL;
  61
  62   /* Starting the short option string with '-' is for programs that
  63      expect options and other ARGV-elements in any order and that care about
  64      the ordering of the two.  We describe each non-option ARGV-element
  65      as if it were the argument of an option with character code 1.  */
  66
  67   const char *shortopts =
  68     "-a:A:b:c:de:F::G:gh:iL:l:Mm:NnO:o:R:rSsT:tu:VvXxY:y:z:()";
  69
  70   /* 150 isn't special; it's just an arbitrary non-ASCII char value.  */
  71
  72 #define OPTION_ASSERT                   150
  73 #define OPTION_CALL_SHARED              (OPTION_ASSERT + 1)
  74 #define OPTION_DEFSYM                   (OPTION_CALL_SHARED + 1)
  75 #define OPTION_DYNAMIC_LINKER           (OPTION_DEFSYM + 1)
  76 #define OPTION_EB                       (OPTION_DYNAMIC_LINKER + 1)
  77 #define OPTION_EL                       (OPTION_EB + 1)
  78 #define OPTION_EMBEDDED_RELOCS          (OPTION_EL + 1)
  79 #define OPTION_EXPORT_DYNAMIC           (OPTION_EMBEDDED_RELOCS + 1)
  80 #define OPTION_HELP                     (OPTION_EXPORT_DYNAMIC + 1)
  81 #define OPTION_IGNORE                   (OPTION_HELP + 1)
  82 #define OPTION_MAP                      (OPTION_IGNORE + 1)
  83 #define OPTION_NO_KEEP_MEMORY           (OPTION_MAP + 1)
  84 #define OPTION_NOINHIBIT_EXEC           (OPTION_NO_KEEP_MEMORY + 1)
  85 #define OPTION_NON_SHARED               (OPTION_NOINHIBIT_EXEC + 1)
  86 #define OPTION_NO_WHOLE_ARCHIVE         (OPTION_NON_SHARED + 1)
  87 #define OPTION_OFORMAT                  (OPTION_NO_WHOLE_ARCHIVE + 1)
  88 #define OPTION_RELAX                    (OPTION_OFORMAT + 1)
  89 #define OPTION_RETAIN_SYMBOLS_FILE      (OPTION_RELAX + 1)
  90 #define OPTION_RPATH                    (OPTION_RETAIN_SYMBOLS_FILE + 1)
  91 #define OPTION_RPATH_LINK               (OPTION_RPATH + 1)
  92 #define OPTION_SHARED                   (OPTION_RPATH_LINK + 1)
  93 #define OPTION_SONAME                   (OPTION_SHARED + 1)
  94 #define OPTION_SORT_COMMON              (OPTION_SONAME + 1)
  95 #define OPTION_STATS                    (OPTION_SORT_COMMON + 1)
  96 #define OPTION_SYMBOLIC                 (OPTION_STATS + 1)
  97 #define OPTION_TBSS                     (OPTION_SYMBOLIC + 1)
  98 #define OPTION_TDATA                    (OPTION_TBSS + 1)
  99 #define OPTION_TTEXT                    (OPTION_TDATA + 1)
 100 #define OPTION_TRADITIONAL_FORMAT       (OPTION_TTEXT + 1)
 101 #define OPTION_UR                       (OPTION_TRADITIONAL_FORMAT + 1)
 102 #define OPTION_VERBOSE                  (OPTION_UR + 1)
 103 #define OPTION_VERSION                  (OPTION_VERBOSE + 1)
 104 #define OPTION_WARN_COMMON              (OPTION_VERSION + 1)
 105 #define OPTION_WARN_CONSTRUCTORS        (OPTION_WARN_COMMON + 1)
 106 #define OPTION_WARN_MULTIPLE_GP         (OPTION_WARN_CONSTRUCTORS + 1)
 107 #define OPTION_WARN_ONCE                (OPTION_WARN_MULTIPLE_GP + 1)
 108 #define OPTION_SPLIT_BY_RELOC           (OPTION_WARN_ONCE + 1)
 109 #define OPTION_SPLIT_BY_FILE            (OPTION_SPLIT_BY_RELOC + 1)
 110 #define OPTION_WHOLE_ARCHIVE            (OPTION_SPLIT_BY_FILE + 1)
 111 #define OPTION_WRAP                     (OPTION_WHOLE_ARCHIVE + 1)
 112
 113   static struct option longopts[] = {
 114   /* Sorted alphabeticaly, except for the PE options grouped at the end. */
 115     {"assert", required_argument, NULL, OPTION_ASSERT},
 116     {"Bdynamic", no_argument, NULL, OPTION_CALL_SHARED},
 117     {"Bstatic", no_argument, NULL, OPTION_NON_SHARED},
 118     {"Bsymbolic", no_argument, NULL, OPTION_SYMBOLIC},
 119     {"call_shared", no_argument, NULL, OPTION_CALL_SHARED},
 120     {"dc", no_argument, NULL, 'd'},
 121     {"defsym", required_argument, NULL, OPTION_DEFSYM},
 122     {"dll-verbose", no_argument, NULL, OPTION_VERSION}, /* Linux.  */
 123     {"dn", no_argument, NULL, OPTION_NON_SHARED},
 124     {"dp", no_argument, NULL, 'd'},
 125     {"dy", no_argument, NULL, OPTION_CALL_SHARED},
 126     {"dynamic-linker", required_argument, NULL, OPTION_DYNAMIC_LINKER},
 127     {"EB", no_argument, NULL, OPTION_EB},
 128     {"EL", no_argument, NULL, OPTION_EL},
 129     {"embedded-relocs", no_argument, NULL, OPTION_EMBEDDED_RELOCS},
 130     {"end-group", no_argument, NULL, ')'},
 131     {"export-dynamic", no_argument, NULL, OPTION_EXPORT_DYNAMIC},
 132     {"format", required_argument, NULL, 'b'},
 133     {"help", no_argument, NULL, OPTION_HELP},
 134     {"Map", required_argument, NULL, OPTION_MAP},
 135     {"no-keep-memory", no_argument, NULL, OPTION_NO_KEEP_MEMORY},
 136     {"no-whole-archive", no_argument, NULL, OPTION_NO_WHOLE_ARCHIVE},
 137     {"noinhibit-exec", no_argument, NULL, OPTION_NOINHIBIT_EXEC},
 138     {"noinhibit_exec", no_argument, NULL, OPTION_NOINHIBIT_EXEC},
 139     {"non_shared", no_argument, NULL, OPTION_NON_SHARED},
 140     {"oformat", required_argument, NULL, OPTION_OFORMAT},
 141     {"Qy", no_argument, NULL, OPTION_IGNORE},
 142     {"qmagic", no_argument, NULL, OPTION_IGNORE}, /* Linux compatibility.  */
 143     {"relax", no_argument, NULL, OPTION_RELAX},
 144     {"retain-symbols-file", required_argument, NULL, OPTION_RETAIN_SYMBOLS_FILE},
 145     {"rpath", required_argument, NULL, OPTION_RPATH},
 146     {"rpath-link", required_argument, NULL, OPTION_RPATH_LINK},
 147     {"shared", no_argument, NULL, OPTION_SHARED},
 148     {"soname", required_argument, NULL, OPTION_SONAME},
 149     {"sort-common", no_argument, NULL, OPTION_SORT_COMMON},
 150     {"sort_common", no_argument, NULL, OPTION_SORT_COMMON},
 151     {"start-group", no_argument, NULL, '('},
 152     {"stats", no_argument, NULL, OPTION_STATS},
 153     {"static", no_argument, NULL, OPTION_NON_SHARED},
 154     {"Tbss", required_argument, NULL, OPTION_TBSS},
 155     {"Tdata", required_argument, NULL, OPTION_TDATA},
 156     {"Ttext", required_argument, NULL, OPTION_TTEXT},
 157     {"traditional-format", no_argument, NULL, OPTION_TRADITIONAL_FORMAT},
 158     {"Ur", no_argument, NULL, OPTION_UR},
 159     {"verbose", no_argument, NULL, OPTION_VERBOSE},
 160     {"version", no_argument, NULL, OPTION_VERSION},
 161     {"warn-common", no_argument, NULL, OPTION_WARN_COMMON},
 162     {"warn-constructors", no_argument, NULL, OPTION_WARN_CONSTRUCTORS},
 163     {"warn-multiple-gp", no_argument, NULL, OPTION_WARN_MULTIPLE_GP},
 164     {"warn-once", no_argument, NULL, OPTION_WARN_ONCE},
 165     {"split-by-reloc", required_argument, NULL, OPTION_SPLIT_BY_RELOC},
 166     {"split-by-file", no_argument, NULL, OPTION_SPLIT_BY_FILE},
 167     {"whole-archive", no_argument, NULL, OPTION_WHOLE_ARCHIVE},
 168     {"wrap", required_argument, NULL, OPTION_WRAP},
 169
 170     {NULL, no_argument, NULL, 0}
 171   };
 172
 173   /* The -G option is ambiguous on different platforms.  Sometimes it
 174      specifies the largest data size to put into the small data
 175      section.  Sometimes it is equivalent to --shared.  Unfortunately,
 176      the first form takes an argument, while the second does not.
 177
 178      We need to permit the --shared form because on some platforms,
 179      such as Solaris, gcc -shared will pass -G to the linker.
 180
 181      To permit either usage, we look through the argument list.  If we
 182      find -G not followed by a number, we change it into --shared.
 183      This will work for most normal cases.  */
 184   for (i = 1; i < argc; i++)
 185     if (strcmp (argv[i], "-G") == 0
 186         && (i + 1 >= argc
 187             || ! isdigit (argv[i + 1][0])))
 188       argv[i] = (char *) "--shared";
 189
 190   while (1)
 191     {
 192       /* getopt_long_only is like getopt_long, but '-' as well as '--' can
 193          indicate a long option.  */
 194       int longind;
 195       int optc;
 196
 197       if (ldemul_parse_args (argc, argv))
 198         continue;
 199
 200       optc = getopt_long_only (argc, argv, shortopts, longopts, &longind);
 201
 202       if (optc == -1)
 203         break;
 204       switch (optc)
 205         {
 206         default:
 207           xexit (1);
 208         case 1:                 /* File name.  */
 209           lang_add_input_file (optarg, lang_input_file_is_file_enum,
 210                                (char *) NULL);
 211           break;
 212
 213         case OPTION_IGNORE:
 214           break;
 215         case 'a':
 216           /* For HP/UX compatibility.  Actually -a shared should mean
 217              ``use only shared libraries'' but, then, we don't
 218              currently support shared libraries on HP/UX anyhow.  */
 219           if (strcmp (optarg, "archive") == 0)
 220             config.dynamic_link = false;
 221           else if (strcmp (optarg, "shared") == 0
 222                    || strcmp (optarg, "default") == 0)
 223             config.dynamic_link = true;
 224           else
 225             einfo ("%P%F: unrecognized -a option `%s'\n", optarg);
 226           break;
 227         case OPTION_ASSERT:
 228           /* FIXME: We just ignore these, but we should handle them.  */
 229           if (strcmp (optarg, "definitions") == 0)
 230             ;
 231           else if (strcmp (optarg, "nodefinitions") == 0)
 232             ;
 233           else if (strcmp (optarg, "nosymbolic") == 0)
 234             ;
 235           else if (strcmp (optarg, "pure-text") == 0)
 236             ;
 237           else
 238             einfo ("%P%F: unrecognized -assert option `%s'\n", optarg);
 239           break;
 240         case 'A':
 241           ldfile_add_arch (optarg);
 242           break;
 243         case 'b':
 244           lang_add_target (optarg);
 245           break;
 246         case 'c':
 247           ldfile_open_command_file (optarg);
 248           parser_input = input_mri_script;
 249           yyparse ();
 250           break;
 251         case OPTION_CALL_SHARED:
 252           config.dynamic_link = true;
 253           break;
 254         case OPTION_NON_SHARED:
 255           config.dynamic_link = false;
 256           break;
 257         case 'd':
 258           command_line.force_common_definition = true;
 259           break;
 260         case OPTION_DEFSYM:
 261           lex_string = optarg;
 262           lex_redirect (optarg);
 263           parser_input = input_defsym;
 264           parsing_defsym = 1;
 265           yyparse ();
 266           parsing_defsym = 0;
 267           lex_string = NULL;
 268           break;
 269         case OPTION_DYNAMIC_LINKER:
 270           command_line.interpreter = optarg;
 271           break;
 272         case OPTION_EB:
 273           command_line.endian = ENDIAN_BIG;
 274           break;
 275         case OPTION_EL:
 276           command_line.endian = ENDIAN_LITTLE;
 277           break;
 278         case OPTION_EMBEDDED_RELOCS:
 279           command_line.embedded_relocs = true;
 280           break;
 281         case OPTION_EXPORT_DYNAMIC:
 282           command_line.export_dynamic = true;
 283           break;
 284         case 'e':
 285           lang_add_entry (optarg, true);
 286           break;
 287         case 'F':
 288           /* Ignore.  */
 289           break;
 290         case 'G':
 291           {
 292             char *end;
 293             g_switch_value = strtoul (optarg, &end, 0);
 294             if (*end)
 295               einfo ("%P%F: invalid number `%s'\n", optarg);
 296           }
 297           break;
 298         case 'g':
 299           /* Ignore.  */
 300           break;
 301         case OPTION_HELP:
 302           help ();
 303           xexit (0);
 304           break;
 305         case 'L':
 306           ldfile_add_library_path (optarg, true);
 307           break;
 308         case 'l':
 309           lang_add_input_file (optarg, lang_input_file_is_l_enum,
 310                                (char *) NULL);
 311           break;
 312         case 'M':
 313           config.map_filename = "-";
 314           break;
 315         case 'm':
 316           /* Ignore.  Was handled in a pre-parse.   */
 317           break;
 318         case OPTION_MAP:
 319           config.map_filename = optarg;
 320           break;
 321         case 'N':
 322           config.text_read_only = false;
 323           config.magic_demand_paged = false;
 324           config.dynamic_link = false;
 325           break;
 326         case 'n':
 327           config.magic_demand_paged = false;
 328           config.dynamic_link = false;
 329           break;
 330         case OPTION_NO_KEEP_MEMORY:
 331           link_info.keep_memory = false;
 332           break;
 333         case OPTION_NOINHIBIT_EXEC:
 334           force_make_executable = true;
 335           break;
 336         case OPTION_NO_WHOLE_ARCHIVE:
 337           whole_archive = false;
 338           break;
 339         case 'O':
 340           /* FIXME "-O<non-digits> <value>" used to set the address of
 341              section <non-digits>.  Was this for compatibility with
 342              something, or can we create a new option to do that
 343              (with a syntax similar to -defsym)?
 344              getopt can't handle two args to an option without kludges.  */
 345           break;
 346         case 'o':
 347           lang_add_output (optarg, 0);
 348           break;
 349         case OPTION_OFORMAT:
 350           lang_add_output_format (optarg, (char *) NULL, (char *) NULL, 0);
 351           break;
 352         case 'i':
 353         case 'r':
 354           link_info.relocateable = true;
 355           config.build_constructors = false;
 356           config.magic_demand_paged = false;
 357           config.text_read_only = false;
 358           config.dynamic_link = false;
 359           break;
 360         case 'R':
 361           /* The GNU linker traditionally uses -R to mean to include
 362              only the symbols from a file.  The Solaris linker uses -R
 363              to set the path used by the runtime linker to find
 364              libraries.  This is the GNU linker -rpath argument.  We
 365              try to support both simultaneously by checking the file
 366              named.  If it is a directory, rather than a regular file,
 367              we assume -rpath was meant.  */
 368           {
 369             struct stat s;
 370
 371             if (stat (optarg, &s) >= 0
 372                 && ! S_ISDIR (s.st_mode))
 373               {
 374                 lang_add_input_file (optarg,
 375                                      lang_input_file_is_symbols_only_enum,
 376                                      (char *) NULL);
 377                 break;
 378               }
 379           }
 380           /* Fall through.  */
 381         case OPTION_RPATH:
 382           if (command_line.rpath == NULL)
 383             command_line.rpath = buystring (optarg);
 384           else
 385             {
 386               char *buf;
 387
 388               buf = xmalloc (strlen (command_line.rpath)
 389                              + strlen (optarg)
 390                              + 2);
 391               sprintf (buf, "%s:%s", command_line.rpath, optarg);
 392               free (command_line.rpath);
 393               command_line.rpath = buf;
 394             }
 395           break;
 396         case OPTION_RPATH_LINK:
 397           if (command_line.rpath_link == NULL)
 398             command_line.rpath_link = buystring (optarg);
 399           else
 400             {
 401               char *buf;
 402
 403               buf = xmalloc (strlen (command_line.rpath_link)
 404                              + strlen (optarg)
 405                              + 2);
 406               sprintf (buf, "%s:%s", command_line.rpath_link, optarg);
 407               free (command_line.rpath_link);
 408               command_line.rpath_link = buf;
 409             }
 410           break;
 411         case OPTION_RELAX:
 412           command_line.relax = true;
 413           break;
 414         case OPTION_RETAIN_SYMBOLS_FILE:
 415           add_keepsyms_file (optarg);
 416           break;
 417         case 'S':
 418           link_info.strip = strip_debugger;
 419           break;
 420         case 's':
 421           link_info.strip = strip_all;
 422           break;
 423         case OPTION_SHARED:
 424           link_info.shared = true;
 425           break;
 426         case 'h':               /* Used on Solaris.  */
 427         case OPTION_SONAME:
 428           command_line.soname = optarg;
 429           break;
 430         case OPTION_SORT_COMMON:
 431           config.sort_common = true;
 432           break;
 433         case OPTION_STATS:
 434           config.stats = true;
 435           break;
 436         case OPTION_SYMBOLIC:
 437           link_info.symbolic = true;
 438           break;
 439         case 't':
 440           trace_files = true;
 441           break;
 442         case 'T':
 443           ldfile_open_command_file (optarg);
 444           parser_input = input_script;
 445           yyparse ();
 446           break;
 447         case OPTION_TBSS:
 448           set_section_start (".bss", optarg);
 449           break;
 450         case OPTION_TDATA:
 451           set_section_start (".data", optarg);
 452           break;
 453         case OPTION_TTEXT:
 454           set_section_start (".text", optarg);
 455           break;
 456         case OPTION_TRADITIONAL_FORMAT:
 457           config.traditional_format = true;
 458           break;
 459         case OPTION_UR:
 460           link_info.relocateable = true;
 461           config.build_constructors = true;
 462           config.magic_demand_paged = false;
 463           config.text_read_only = false;
 464           config.dynamic_link = false;
 465           break;
 466         case 'u':
 467           ldlang_add_undef (optarg);
 468           break;
 469         case OPTION_VERBOSE:
 470           ldversion (1);
 471           version_printed = true;
 472           trace_file_tries = true;
 473           break;
 474         case 'v':
 475           ldversion (0);
 476           version_printed = true;
 477           break;
 478         case 'V':
 479           ldversion (1);
 480           version_printed = true;
 481           break;
 482         case OPTION_VERSION:
 483           ldversion (0);
 484           version_printed = true;
 485           break;
 486         case OPTION_WARN_COMMON:
 487           config.warn_common = true;
 488           break;
 489         case OPTION_WARN_CONSTRUCTORS:
 490           config.warn_constructors = true;
 491           break;
 492         case OPTION_WARN_MULTIPLE_GP:
 493           config.warn_multiple_gp = true;
 494           break;
 495         case OPTION_WARN_ONCE:
 496           config.warn_once = true;
 497           break;
 498         case OPTION_WHOLE_ARCHIVE:
 499           whole_archive = true;
 500           break;
 501         case OPTION_WRAP:
 502           if (link_info.wrap_hash == NULL)
 503             {
 504               link_info.wrap_hash = ((struct bfd_hash_table *)
 505                                      xmalloc (sizeof (struct bfd_hash_table)));
 506               if (! bfd_hash_table_init_n (link_info.wrap_hash,
 507                                            bfd_hash_newfunc,
 508                                            61))
 509                 einfo ("%P%F: bfd_hash_table_init failed: %E\n");
 510             }
 511           if (bfd_hash_lookup (link_info.wrap_hash, optarg, true, true)
 512               == NULL)
 513             einfo ("%P%F: bfd_hash_lookup failed: %E\n");
 514           break;
 515         case 'X':
 516           link_info.discard = discard_l;
 517           break;
 518         case 'x':
 519           link_info.discard = discard_all;
 520           break;
 521         case 'Y':
 522           if (strncmp (optarg, "P,", 2) == 0)
 523             optarg += 2;
 524           default_dirlist = optarg;
 525           break;
 526         case 'y':
 527           add_ysym (optarg);
 528           break;
 529         case 'z':
 530           /* We accept and ignore this option for Solaris
 531              compatibility.  Actually, on Solaris, optarg is not
 532              ignored.  Someday we should handle it correctly.  FIXME.  */
 533           break;
 534         case OPTION_SPLIT_BY_RELOC:
 535           config.split_by_reloc = atoi (optarg);
 536           break;
 537         case OPTION_SPLIT_BY_FILE:
 538           config.split_by_file = true;
 539           break;
 540         case '(':
 541           if (ingroup)
 542             {
 543               fprintf (stderr,
 544                        "%s: may not nest groups (--help for usage)\n",
 545                        program_name);
 546               xexit (1);
 547             }
 548           lang_enter_group ();
 549           ingroup = 1;
 550           break;
 551         case ')':
 552           if (! ingroup)
 553             {
 554               fprintf (stderr,
 555                        "%s: group ended before it began (--help for usage)\n",
 556                        program_name);
 557               xexit (1);
 558             }
 559           lang_leave_group ();
 560           ingroup = 0;
 561           break;
 562
 563         }
 564     }
 565
 566   if (ingroup)
 567     lang_leave_group ();
 568
 569   if (default_dirlist != NULL)
 570     set_default_dirlist (default_dirlist);
 571
 572 }
 573
 574 /* Add the (colon-separated) elements of DIRLIST_PTR to the
 575    library search path.  */
 576
 577 static void
 578 set_default_dirlist (dirlist_ptr)
 579      char *dirlist_ptr;
 580 {
 581   char *p;
 582
 583   while (1)
 584     {
 585       p = strchr (dirlist_ptr, ':');
 586       if (p != NULL)
 587         *p = 0;
 588       if (*dirlist_ptr)
 589         ldfile_add_library_path (dirlist_ptr, true);
 590       if (p == NULL)
 591         break;
 592       *p = ':';
 593       dirlist_ptr = p + 1;
 594     }
 595 }
 596
 597 static void
 598 set_section_start (sect, valstr)
 599      char *sect, *valstr;
 600 {
 601   char *end;
 602   unsigned long val = strtoul (valstr, &end, 16);
 603   if (*end)
 604     einfo ("%P%F: invalid hex number `%s'\n", valstr);
 605   lang_section_start (sect, exp_intop (val));
 606 }
 607 \f