gcc/config/elfos.h

   1 /* elfos.h  --  operating system specific defines to be used when
   2    targeting GCC for some generic ELF system
   3    Copyright (C) 1991, 1994, 1995, 1999, 2000, 2001, 2002, 2003, 2004,
   4    2007, 2009, 2010 Free Software Foundation, Inc.
   5    Based on svr4.h contributed by Ron Guilmette (rfg@netcom.com).
   6
   7 This file is part of GCC.
   8
   9 GCC is free software; you can redistribute it and/or modify
  10 it under the terms of the GNU General Public License as published by
  11 the Free Software Foundation; either version 3, or (at your option)
  12 any later version.
  13
  14 GCC is distributed in the hope that it will be useful,
  15 but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 GNU General Public License for more details.
  18
  19 Under Section 7 of GPL version 3, you are granted additional
  20 permissions described in the GCC Runtime Library Exception, version
  21 3.1, as published by the Free Software Foundation.
  22
  23 You should have received a copy of the GNU General Public License and
  24 a copy of the GCC Runtime Library Exception along with this program;
  25 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  26 <http://www.gnu.org/licenses/>.  */
  27
  28 #define TARGET_OBJFMT_CPP_BUILTINS()            \
  29   do                                            \
  30     {                                           \
  31         builtin_define ("__ELF__");             \
  32     }                                           \
  33   while (0)
  34
  35 /* Define a symbol indicating that we are using elfos.h.
  36    Some CPU specific configuration files use this.  */
  37 #define USING_ELFOS_H
  38
  39 /* The prefix to add to user-visible assembler symbols.
  40
  41    For ELF systems the convention is *not* to prepend a leading
  42    underscore onto user-level symbol names.  */
  43
  44 #undef  USER_LABEL_PREFIX
  45 #define USER_LABEL_PREFIX ""
  46
  47 /* The biggest alignment supported by ELF in bits. 32-bit ELF
  48    supports section alignment up to (0x80000000 * 8), while
  49    64-bit ELF supports (0x8000000000000000 * 8). If this macro
  50    is not defined, the default is the largest alignment supported
  51    by 32-bit ELF and representable on a 32-bit host. Use this
  52    macro to limit the alignment which can be specified using
  53    the `__attribute__ ((aligned (N)))' construct.  */
  54 #ifndef MAX_OFILE_ALIGNMENT
  55 #define MAX_OFILE_ALIGNMENT (((unsigned int) 1 << 28) * 8)
  56 #endif
  57
  58 /* Use periods rather than dollar signs in special g++ assembler names.  */
  59
  60 #define NO_DOLLAR_IN_LABEL
  61
  62 /* Writing `int' for a bit-field forces int alignment for the structure.  */
  63
  64 #ifndef PCC_BITFIELD_TYPE_MATTERS
  65 #define PCC_BITFIELD_TYPE_MATTERS 1
  66 #endif
  67
  68 /* All ELF targets can support DWARF-2.  */
  69
  70 #define DWARF2_DEBUGGING_INFO 1
  71
  72 /* The GNU tools operate better with dwarf2, and it is required by some
  73    psABI's.  Since we don't have any native tools to be compatible with,
  74    default to dwarf2.  */
  75
  76 #ifndef PREFERRED_DEBUGGING_TYPE
  77 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
  78 #endif
  79
  80 /* All SVR4 targets use the ELF object file format.  */
  81 #define OBJECT_FORMAT_ELF
  82
  83
  84 /* Output #ident as a .ident.  */
  85
  86 #define ASM_OUTPUT_IDENT(FILE, NAME) \
  87   fprintf (FILE, "%s\"%s\"\n", IDENT_ASM_OP, NAME);
  88
  89 #define IDENT_ASM_OP "\t.ident\t"
  90
  91 #undef  SET_ASM_OP
  92 #define SET_ASM_OP      "\t.set\t"
  93
  94 /* Most svr4 assemblers want a .file directive at the beginning of
  95    their input file.  */
  96 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE true
  97
  98 /* This is how to allocate empty space in some section.  The .zero
  99    pseudo-op is used for this on most svr4 assemblers.  */
 100
 101 #define SKIP_ASM_OP     "\t.zero\t"
 102
 103 #undef  ASM_OUTPUT_SKIP
 104 #define ASM_OUTPUT_SKIP(FILE, SIZE) \
 105    fprintf ((FILE), "%s"HOST_WIDE_INT_PRINT_UNSIGNED"\n",\
 106             SKIP_ASM_OP, (SIZE))
 107
 108 /* This is how to store into the string LABEL
 109    the symbol_ref name of an internal numbered label where
 110    PREFIX is the class of label and NUM is the number within the class.
 111    This is suitable for output with `assemble_name'.
 112
 113    For most svr4 systems, the convention is that any symbol which begins
 114    with a period is not put into the linker symbol table by the assembler.  */
 115
 116 #undef  ASM_GENERATE_INTERNAL_LABEL
 117 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM)         \
 118   do                                                            \
 119     {                                                           \
 120       sprintf (LABEL, "*.%s%u", PREFIX, (unsigned) (NUM));      \
 121     }                                                           \
 122   while (0)
 123
 124 /* Output the label which precedes a jumptable.  Note that for all svr4
 125    systems where we actually generate jumptables (which is to say every
 126    svr4 target except i386, where we use casesi instead) we put the jump-
 127    tables into the .rodata section and since other stuff could have been
 128    put into the .rodata section prior to any given jumptable, we have to
 129    make sure that the location counter for the .rodata section gets pro-
 130    perly re-aligned prior to the actual beginning of the jump table.  */
 131
 132 #undef ALIGN_ASM_OP
 133 #define ALIGN_ASM_OP "\t.align\t"
 134
 135 #ifndef ASM_OUTPUT_BEFORE_CASE_LABEL
 136 #define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE, PREFIX, NUM, TABLE) \
 137   ASM_OUTPUT_ALIGN ((FILE), 2);
 138 #endif
 139
 140 #undef  ASM_OUTPUT_CASE_LABEL
 141 #define ASM_OUTPUT_CASE_LABEL(FILE, PREFIX, NUM, JUMPTABLE)             \
 142   do                                                                    \
 143     {                                                                   \
 144       ASM_OUTPUT_BEFORE_CASE_LABEL (FILE, PREFIX, NUM, JUMPTABLE)       \
 145         (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM);                  \
 146     }                                                                   \
 147   while (0)
 148
 149 /* The standard SVR4 assembler seems to require that certain builtin
 150    library routines (e.g. .udiv) be explicitly declared as .globl
 151    in each assembly file where they are referenced.  */
 152
 153 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN)  \
 154   (*targetm.asm_out.globalize_label) (FILE, XSTR (FUN, 0))
 155
 156 /* This says how to output assembler code to declare an
 157    uninitialized external linkage data object.  Under SVR4,
 158    the linker seems to want the alignment of data objects
 159    to depend on their types.  We do exactly that here.  */
 160
 161 #define COMMON_ASM_OP   "\t.comm\t"
 162
 163 #undef  ASM_OUTPUT_ALIGNED_COMMON
 164 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN)              \
 165   do                                                                    \
 166     {                                                                   \
 167       fprintf ((FILE), "%s", COMMON_ASM_OP);                            \
 168       assemble_name ((FILE), (NAME));                                   \
 169       fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n",          \
 170                (SIZE), (ALIGN) / BITS_PER_UNIT);                        \
 171     }                                                                   \
 172   while (0)
 173
 174 /* This says how to output assembler code to declare an
 175    uninitialized internal linkage data object.  Under SVR4,
 176    the linker seems to want the alignment of data objects
 177    to depend on their types.  We do exactly that here.  */
 178
 179 #define LOCAL_ASM_OP    "\t.local\t"
 180
 181 #undef  ASM_OUTPUT_ALIGNED_LOCAL
 182 #define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN)       \
 183   do                                                            \
 184     {                                                           \
 185       fprintf ((FILE), "%s", LOCAL_ASM_OP);                     \
 186       assemble_name ((FILE), (NAME));                           \
 187       fprintf ((FILE), "\n");                                   \
 188       ASM_OUTPUT_ALIGNED_COMMON (FILE, NAME, SIZE, ALIGN);      \
 189     }                                                           \
 190   while (0)
 191
 192 /* This is the pseudo-op used to generate a contiguous sequence of byte
 193    values from a double-quoted string WITHOUT HAVING A TERMINATING NUL
 194    AUTOMATICALLY APPENDED.  This is the same for most svr4 assemblers.  */
 195
 196 #undef  ASCII_DATA_ASM_OP
 197 #define ASCII_DATA_ASM_OP       "\t.ascii\t"
 198
 199 /* Support a read-only data section.  */
 200 #define READONLY_DATA_SECTION_ASM_OP    "\t.section\t.rodata"
 201
 202 /* On svr4, we *do* have support for the .init and .fini sections, and we
 203    can put stuff in there to be executed before and after `main'.  We let
 204    crtstuff.c and other files know this by defining the following symbols.
 205    The definitions say how to change sections to the .init and .fini
 206    sections.  This is the same for all known svr4 assemblers.  */
 207
 208 #define INIT_SECTION_ASM_OP     "\t.section\t.init"
 209 #define FINI_SECTION_ASM_OP     "\t.section\t.fini"
 210
 211 /* Output assembly directive to move to the beginning of current section.  */
 212 #ifdef HAVE_GAS_SUBSECTION_ORDERING
 213 # define ASM_SECTION_START_OP   "\t.subsection\t-1"
 214 # define ASM_OUTPUT_SECTION_START(FILE) \
 215   fprintf ((FILE), "%s\n", ASM_SECTION_START_OP)
 216 #endif
 217
 218 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
 219
 220 /* Switch into a generic section.  */
 221 #define TARGET_ASM_NAMED_SECTION  default_elf_asm_named_section
 222
 223 #undef  TARGET_ASM_SELECT_RTX_SECTION
 224 #define TARGET_ASM_SELECT_RTX_SECTION default_elf_select_rtx_section
 225 #undef  TARGET_ASM_SELECT_SECTION
 226 #define TARGET_ASM_SELECT_SECTION default_elf_select_section
 227 #undef  TARGET_HAVE_SWITCHABLE_BSS_SECTIONS
 228 #define TARGET_HAVE_SWITCHABLE_BSS_SECTIONS true
 229
 230 /* Define the strings used for the special svr4 .type and .size directives.
 231    These strings generally do not vary from one system running svr4 to
 232    another, but if a given system (e.g. m88k running svr) needs to use
 233    different pseudo-op names for these, they may be overridden in the
 234    file which includes this one.  */
 235
 236 #define TYPE_ASM_OP     "\t.type\t"
 237 #define SIZE_ASM_OP     "\t.size\t"
 238
 239 /* This is how we tell the assembler that a symbol is weak.  */
 240
 241 #define ASM_WEAKEN_LABEL(FILE, NAME)    \
 242   do                                    \
 243     {                                   \
 244       fputs ("\t.weak\t", (FILE));      \
 245       assemble_name ((FILE), (NAME));   \
 246       fputc ('\n', (FILE));             \
 247     }                                   \
 248   while (0)
 249
 250 /* The following macro defines the format used to output the second
 251    operand of the .type assembler directive.  Different svr4 assemblers
 252    expect various different forms for this operand.  The one given here
 253    is just a default.  You may need to override it in your machine-
 254    specific tm.h file (depending upon the particulars of your assembler).  */
 255
 256 #define TYPE_OPERAND_FMT        "@%s"
 257
 258 /* Write the extra assembler code needed to declare a function's result.
 259    Most svr4 assemblers don't require any special declaration of the
 260    result value, but there are exceptions.  */
 261
 262 #ifndef ASM_DECLARE_RESULT
 263 #define ASM_DECLARE_RESULT(FILE, RESULT)
 264 #endif
 265
 266 /* These macros generate the special .type and .size directives which
 267    are used to set the corresponding fields of the linker symbol table
 268    entries in an ELF object file under SVR4.  These macros also output
 269    the starting labels for the relevant functions/objects.  */
 270
 271 /* Write the extra assembler code needed to declare a function properly.
 272    Some svr4 assemblers need to also have something extra said about the
 273    function's return value.  We allow for that here.  */
 274
 275 #ifndef ASM_DECLARE_FUNCTION_NAME
 276 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)             \
 277   do                                                            \
 278     {                                                           \
 279       ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function");       \
 280       ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL));            \
 281       ASM_OUTPUT_FUNCTION_LABEL (FILE, NAME, DECL);             \
 282     }                                                           \
 283   while (0)
 284 #endif
 285
 286 /* Write the extra assembler code needed to declare an object properly.  */
 287
 288 #ifdef HAVE_GAS_GNU_UNIQUE_OBJECT
 289 #define USE_GNU_UNIQUE_OBJECT 1
 290 #else
 291 #define USE_GNU_UNIQUE_OBJECT 0
 292 #endif
 293
 294 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)                       \
 295   do                                                                    \
 296     {                                                                   \
 297       HOST_WIDE_INT size;                                               \
 298                                                                         \
 299       /* For template static data member instantiations or              \
 300          inline fn local statics and their guard variables, use         \
 301          gnu_unique_object so that they will be combined even under     \
 302          RTLD_LOCAL.  Don't use gnu_unique_object for typeinfo,         \
 303          vtables and other read-only artificial decls.  */              \
 304       if (USE_GNU_UNIQUE_OBJECT && DECL_ONE_ONLY (DECL)                 \
 305           && (!DECL_ARTIFICIAL (DECL) || !TREE_READONLY (DECL)))        \
 306         ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "gnu_unique_object");    \
 307       else                                                              \
 308         ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object");               \
 309                                                                         \
 310       size_directive_output = 0;                                        \
 311       if (!flag_inhibit_size_directive                                  \
 312           && (DECL) && DECL_SIZE (DECL))                                \
 313         {                                                               \
 314           size_directive_output = 1;                                    \
 315           size = int_size_in_bytes (TREE_TYPE (DECL));                  \
 316           ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, size);                 \
 317         }                                                               \
 318                                                                         \
 319       ASM_OUTPUT_LABEL (FILE, NAME);                                    \
 320     }                                                                   \
 321   while (0)
 322
 323 /* Output the size directive for a decl in rest_of_decl_compilation
 324    in the case where we did not do so before the initializer.
 325    Once we find the error_mark_node, we know that the value of
 326    size_directive_output was set
 327    by ASM_DECLARE_OBJECT_NAME when it was run for the same decl.  */
 328
 329 #undef ASM_FINISH_DECLARE_OBJECT
 330 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END)\
 331   do                                                            \
 332     {                                                           \
 333       const char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0);   \
 334       HOST_WIDE_INT size;                                       \
 335                                                                 \
 336       if (!flag_inhibit_size_directive                          \
 337           && DECL_SIZE (DECL)                                   \
 338           && ! AT_END && TOP_LEVEL                              \
 339           && DECL_INITIAL (DECL) == error_mark_node             \
 340           && !size_directive_output)                            \
 341         {                                                       \
 342           size_directive_output = 1;                            \
 343           size = int_size_in_bytes (TREE_TYPE (DECL));          \
 344           ASM_OUTPUT_SIZE_DIRECTIVE (FILE, name, size);         \
 345         }                                                       \
 346     }                                                           \
 347   while (0)
 348
 349 /* This is how to declare the size of a function.  */
 350 #ifndef ASM_DECLARE_FUNCTION_SIZE
 351 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)            \
 352   do                                                            \
 353     {                                                           \
 354       if (!flag_inhibit_size_directive)                         \
 355         ASM_OUTPUT_MEASURED_SIZE (FILE, FNAME);                 \
 356     }                                                           \
 357   while (0)
 358 #endif
 359
 360 /* A table of bytes codes used by the ASM_OUTPUT_ASCII and
 361    ASM_OUTPUT_LIMITED_STRING macros.  Each byte in the table
 362    corresponds to a particular byte value [0..255].  For any
 363    given byte value, if the value in the corresponding table
 364    position is zero, the given character can be output directly.
 365    If the table value is 1, the byte must be output as a \ooo
 366    octal escape.  If the tables value is anything else, then the
 367    byte value should be output as a \ followed by the value
 368    in the table.  Note that we can use standard UN*X escape
 369    sequences for many control characters, but we don't use
 370    \a to represent BEL because some svr4 assemblers (e.g. on
 371    the i386) don't know about that.  Also, we don't use \v
 372    since some versions of gas, such as 2.2 did not accept it.  */
 373
 374 #define ESCAPES \
 375 "\1\1\1\1\1\1\1\1btn\1fr\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
 376 \0\0\"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
 377 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\\\0\0\0\
 378 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\
 379 \1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
 380 \1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
 381 \1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
 382 \1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1"
 383
 384 /* Some svr4 assemblers have a limit on the number of characters which
 385    can appear in the operand of a .string directive.  If your assembler
 386    has such a limitation, you should define STRING_LIMIT to reflect that
 387    limit.  Note that at least some svr4 assemblers have a limit on the
 388    actual number of bytes in the double-quoted string, and that they
 389    count each character in an escape sequence as one byte.  Thus, an
 390    escape sequence like \377 would count as four bytes.
 391
 392    If your target assembler doesn't support the .string directive, you
 393    should define this to zero.
 394 */
 395
 396 #define STRING_LIMIT    ((unsigned) 256)
 397
 398 #define STRING_ASM_OP   "\t.string\t"
 399
 400 /* The routine used to output NUL terminated strings.  We use a special
 401    version of this for most svr4 targets because doing so makes the
 402    generated assembly code more compact (and thus faster to assemble)
 403    as well as more readable, especially for targets like the i386
 404    (where the only alternative is to output character sequences as
 405    comma separated lists of numbers).  */
 406
 407 #define ASM_OUTPUT_LIMITED_STRING(FILE, STR)            \
 408   do                                                    \
 409     {                                                   \
 410       register const unsigned char *_limited_str =      \
 411         (const unsigned char *) (STR);                  \
 412       register unsigned ch;                             \
 413                                                         \
 414       fprintf ((FILE), "%s\"", STRING_ASM_OP);          \
 415                                                         \
 416       for (; (ch = *_limited_str); _limited_str++)      \
 417         {                                               \
 418           register int escape;                          \
 419                                                         \
 420           switch (escape = ESCAPES[ch])                 \
 421             {                                           \
 422             case 0:                                     \
 423               putc (ch, (FILE));                        \
 424               break;                                    \
 425             case 1:                                     \
 426               fprintf ((FILE), "\\%03o", ch);           \
 427               break;                                    \
 428             default:                                    \
 429               putc ('\\', (FILE));                      \
 430               putc (escape, (FILE));                    \
 431               break;                                    \
 432             }                                           \
 433         }                                               \
 434                                                         \
 435       fprintf ((FILE), "\"\n");                         \
 436     }                                                   \
 437   while (0)
 438
 439 /* The routine used to output sequences of byte values.  We use a special
 440    version of this for most svr4 targets because doing so makes the
 441    generated assembly code more compact (and thus faster to assemble)
 442    as well as more readable.  Note that if we find subparts of the
 443    character sequence which end with NUL (and which are shorter than
 444    STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING.  */
 445
 446 #undef  ASM_OUTPUT_ASCII
 447 #define ASM_OUTPUT_ASCII(FILE, STR, LENGTH)                             \
 448   do                                                                    \
 449     {                                                                   \
 450       const unsigned char *_ascii_bytes =                               \
 451         (const unsigned char *) (STR);                                  \
 452       const unsigned char *limit = _ascii_bytes + (LENGTH);             \
 453       const unsigned char *last_null = NULL;                            \
 454       unsigned bytes_in_chunk = 0;                                      \
 455                                                                         \
 456       for (; _ascii_bytes < limit; _ascii_bytes++)                      \
 457         {                                                               \
 458           const unsigned char *p;                                       \
 459                                                                         \
 460           if (bytes_in_chunk >= 60)                                     \
 461             {                                                           \
 462               fprintf ((FILE), "\"\n");                                 \
 463               bytes_in_chunk = 0;                                       \
 464             }                                                           \
 465                                                                         \
 466           if (_ascii_bytes > last_null)                                 \
 467             {                                                           \
 468               for (p = _ascii_bytes; p < limit && *p != '\0'; p++)      \
 469                 continue;                                               \
 470               last_null = p;                                            \
 471             }                                                           \
 472           else                                                          \
 473             p = last_null;                                              \
 474                                                                         \
 475           if (p < limit && (p - _ascii_bytes) <= (long)STRING_LIMIT)    \
 476             {                                                           \
 477               if (bytes_in_chunk > 0)                                   \
 478                 {                                                       \
 479                   fprintf ((FILE), "\"\n");                             \
 480                   bytes_in_chunk = 0;                                   \
 481                 }                                                       \
 482                                                                         \
 483               ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes);         \
 484               _ascii_bytes = p;                                         \
 485             }                                                           \
 486           else                                                          \
 487             {                                                           \
 488               register int escape;                                      \
 489               register unsigned ch;                                     \
 490                                                                         \
 491               if (bytes_in_chunk == 0)                                  \
 492                 fprintf ((FILE), "%s\"", ASCII_DATA_ASM_OP);            \
 493                                                                         \
 494               switch (escape = ESCAPES[ch = *_ascii_bytes])             \
 495                 {                                                       \
 496                 case 0:                                                 \
 497                   putc (ch, (FILE));                                    \
 498                   bytes_in_chunk++;                                     \
 499                   break;                                                \
 500                 case 1:                                                 \
 501                   fprintf ((FILE), "\\%03o", ch);                       \
 502                   bytes_in_chunk += 4;                                  \
 503                   break;                                                \
 504                 default:                                                \
 505                   putc ('\\', (FILE));                                  \
 506                   putc (escape, (FILE));                                \
 507                   bytes_in_chunk += 2;                                  \
 508                   break;                                                \
 509                 }                                                       \
 510             }                                                           \
 511         }                                                               \
 512                                                                         \
 513       if (bytes_in_chunk > 0)                                           \
 514         fprintf ((FILE), "\"\n");                                       \
 515     }                                                                   \
 516   while (0)
 517
 518 /* Allow the use of the -frecord-gcc-switches switch via the
 519    elf_record_gcc_switches function defined in varasm.c.  */
 520 #undef  TARGET_ASM_RECORD_GCC_SWITCHES
 521 #define TARGET_ASM_RECORD_GCC_SWITCHES elf_record_gcc_switches
 522
 523 /* A C statement (sans semicolon) to output to the stdio stream STREAM
 524    any text necessary for declaring the name of an external symbol
 525    named NAME which is referenced in this compilation but not defined.
 526    It is needed to properly support non-default visibility.  */
 527
 528 #ifndef ASM_OUTPUT_EXTERNAL
 529 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME) \
 530   default_elf_asm_output_external (FILE, DECL, NAME)
 531 #endif