gcc/config/i386/cygming.h

   1 /* Operating system specific defines to be used when targeting GCC for
   2    hosting on Windows32, using a Unix style C library and tools.
   3    Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
   4    2004, 2005, 2007, 2008, 2009, 2010, 2011
   5    Free Software Foundation, Inc.
   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 You should have received a copy of the GNU General Public License
  20 along with GCC; see the file COPYING3.  If not see
  21 <http://www.gnu.org/licenses/>.  */
  22
  23 #define DBX_DEBUGGING_INFO 1
  24 #define SDB_DEBUGGING_INFO 1
  25 #if TARGET_64BIT_DEFAULT || defined (HAVE_GAS_PE_SECREL32_RELOC)
  26 #define DWARF2_DEBUGGING_INFO 1
  27 #endif
  28
  29 #undef PREFERRED_DEBUGGING_TYPE
  30 #if (DWARF2_DEBUGGING_INFO)
  31 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
  32 #else
  33 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
  34 #endif
  35
  36 #undef TARGET_SEH
  37 #define TARGET_SEH  (TARGET_64BIT_MS_ABI && flag_unwind_tables)
  38
  39 /* Win64 with SEH cannot represent DRAP stack frames.  Disable its use.
  40    Force the use of different mechanisms to allocate aligned local data.  */
  41 #undef MAX_STACK_ALIGNMENT
  42 #define MAX_STACK_ALIGNMENT  (TARGET_SEH ? 128 : MAX_OFILE_ALIGNMENT)
  43
  44 /* Support hooks for SEH.  */
  45 #undef  TARGET_ASM_UNWIND_EMIT
  46 #define TARGET_ASM_UNWIND_EMIT  i386_pe_seh_unwind_emit
  47 #undef  TARGET_ASM_UNWIND_EMIT_BEFORE_INSN
  48 #define TARGET_ASM_UNWIND_EMIT_BEFORE_INSN  false
  49 #undef  TARGET_ASM_FUNCTION_END_PROLOGUE
  50 #define TARGET_ASM_FUNCTION_END_PROLOGUE  i386_pe_seh_end_prologue
  51 #undef  TARGET_ASM_EMIT_EXCEPT_PERSONALITY
  52 #define TARGET_ASM_EMIT_EXCEPT_PERSONALITY i386_pe_seh_emit_except_personality
  53 #undef  TARGET_ASM_INIT_SECTIONS
  54 #define TARGET_ASM_INIT_SECTIONS  i386_pe_seh_init_sections
  55 #define SUBTARGET_ASM_UNWIND_INIT  i386_pe_seh_init
  56
  57 #undef DEFAULT_ABI
  58 #define DEFAULT_ABI (TARGET_64BIT ? MS_ABI : SYSV_ABI)
  59
  60 #if ! defined (USE_MINGW64_LEADING_UNDERSCORES)
  61 #undef USER_LABEL_PREFIX
  62 #define USER_LABEL_PREFIX (TARGET_64BIT ? "" : "_")
  63
  64 #undef LOCAL_LABEL_PREFIX
  65 #define LOCAL_LABEL_PREFIX (TARGET_64BIT ? "." : "")
  66
  67 #undef ASM_GENERATE_INTERNAL_LABEL
  68 #define ASM_GENERATE_INTERNAL_LABEL(BUF,PREFIX,NUMBER)  \
  69   sprintf ((BUF), "*%s%s%ld", LOCAL_LABEL_PREFIX, \
  70            (PREFIX), (long)(NUMBER))
  71
  72 #undef LPREFIX
  73 #define LPREFIX (TARGET_64BIT ? ".L" : "L")
  74
  75 #endif
  76
  77 #undef DBX_REGISTER_NUMBER
  78 #define DBX_REGISTER_NUMBER(n)                          \
  79   (TARGET_64BIT ? dbx64_register_map[n]                 \
  80    : (write_symbols == DWARF2_DEBUG                     \
  81       ? svr4_dbx_register_map[n] : dbx_register_map[n]))
  82
  83 /* Map gcc register number to DWARF 2 CFA column number. For 32 bit
  84    target, always use the svr4_dbx_register_map for DWARF .eh_frame
  85    even if we don't use DWARF .debug_frame. */
  86 #undef DWARF_FRAME_REGNUM
  87 #define DWARF_FRAME_REGNUM(n)                           \
  88   (TARGET_64BIT ? dbx64_register_map[(n)]               \
  89                 : svr4_dbx_register_map[(n)])
  90
  91 /* The 64-bit MS_ABI changes the set of call-used registers.  */
  92 #undef DWARF_FRAME_REGISTERS
  93 #define DWARF_FRAME_REGISTERS (TARGET_64BIT ? 33 : 17)
  94
  95 #ifdef HAVE_GAS_PE_SECREL32_RELOC
  96 /* Use section relative relocations for debugging offsets.  Unlike
  97    other targets that fake this by putting the section VMA at 0, PE
  98    won't allow it.  */
  99 #define ASM_OUTPUT_DWARF_OFFSET(FILE, SIZE, LABEL, SECTION)     \
 100   do {                                                          \
 101     switch (SIZE)                                               \
 102       {                                                         \
 103       case 4:                                                   \
 104         fputs ("\t.secrel32\t", FILE);                          \
 105         assemble_name (FILE, LABEL);                            \
 106         break;                                                  \
 107       case 8:                                                   \
 108         /* This is a hack.  There is no 64-bit section relative \
 109            relocation.  However, the COFF format also does not  \
 110            support 64-bit file offsets; 64-bit applications are \
 111            limited to 32-bits of code+data in any one module.   \
 112            Fake the 64-bit offset by zero-extending it.  */     \
 113         fputs ("\t.secrel32\t", FILE);                          \
 114         assemble_name (FILE, LABEL);                            \
 115         fputs ("\n\t.long\t0", FILE);                           \
 116         break;                                                  \
 117       default:                                                  \
 118         gcc_unreachable ();                                     \
 119       }                                                         \
 120   } while (0)
 121 #endif
 122
 123 #define TARGET_EXECUTABLE_SUFFIX ".exe"
 124
 125 #define TARGET_OS_CPP_BUILTINS()                                        \
 126   do                                                                    \
 127     {                                                                   \
 128         if (!TARGET_64BIT)                                              \
 129           builtin_define ("_X86_=1");                                   \
 130         if (TARGET_SEH)                                                 \
 131           builtin_define ("__SEH__");                           \
 132         builtin_assert ("system=winnt");                                \
 133         builtin_define ("__stdcall=__attribute__((__stdcall__))");      \
 134         builtin_define ("__fastcall=__attribute__((__fastcall__))");    \
 135         builtin_define ("__thiscall=__attribute__((__thiscall__))");    \
 136         builtin_define ("__cdecl=__attribute__((__cdecl__))");          \
 137         if (!flag_iso)                                                  \
 138           {                                                             \
 139             builtin_define ("_stdcall=__attribute__((__stdcall__))");   \
 140             builtin_define ("_fastcall=__attribute__((__fastcall__))"); \
 141             builtin_define ("_thiscall=__attribute__((__thiscall__))"); \
 142             builtin_define ("_cdecl=__attribute__((__cdecl__))");       \
 143           }                                                             \
 144         /* Even though linkonce works with static libs, this is needed  \
 145             to compare typeinfo symbols across dll boundaries.  */      \
 146         builtin_define ("__GXX_MERGED_TYPEINFO_NAMES=0");               \
 147         builtin_define ("__GXX_TYPEINFO_EQUALITY_INLINE=0");            \
 148         EXTRA_OS_CPP_BUILTINS ();                                       \
 149   }                                                                     \
 150   while (0)
 151
 152 /* Get tree.c to declare a target-specific specialization of
 153    merge_decl_attributes.  */
 154 #define TARGET_DLLIMPORT_DECL_ATTRIBUTES 1
 155
 156 /* This macro defines names of additional specifications to put in the specs
 157    that can be used in various specifications like CC1_SPEC.  Its definition
 158    is an initializer with a subgrouping for each command option.
 159
 160    Each subgrouping contains a string constant, that defines the
 161    specification name, and a string constant that used by the GCC driver
 162    program.
 163
 164    Do not define this macro if it does not need to do anything.  */
 165
 166 #undef  SUBTARGET_EXTRA_SPECS
 167 #define SUBTARGET_EXTRA_SPECS                                           \
 168   { "mingw_include_path", DEFAULT_TARGET_MACHINE }
 169
 170 #undef MATH_LIBRARY
 171 #define MATH_LIBRARY ""
 172
 173 #define SIZE_TYPE (TARGET_64BIT ? "long long unsigned int" : "unsigned int")
 174 #define PTRDIFF_TYPE (TARGET_64BIT ? "long long int" : "int")
 175
 176 #define WCHAR_TYPE_SIZE 16
 177 #define WCHAR_TYPE "short unsigned int"
 178
 179 /* Windows64 continues to use a 32-bit long type.  */
 180 #undef LONG_TYPE_SIZE
 181 #define LONG_TYPE_SIZE 32
 182 \f
 183 #define drectve_section() \
 184   (fprintf (asm_out_file, "\t.section .drectve\n"), \
 185    in_section = NULL)
 186
 187 /* Older versions of gas don't handle 'r' as data.
 188    Explicitly set data flag with 'd'.  */
 189 #define READONLY_DATA_SECTION_ASM_OP "\t.section .rdata,\"dr\""
 190
 191 /* Don't allow flag_pic to propagate since gas may produce invalid code
 192    otherwise.  */
 193
 194 #undef  SUBTARGET_OVERRIDE_OPTIONS
 195 #define SUBTARGET_OVERRIDE_OPTIONS                                      \
 196 do {                                                                    \
 197   if (TARGET_64BIT && flag_pic != 1)                                    \
 198     {                                                                   \
 199       if (flag_pic > 1)                                                 \
 200         warning (0,                                                     \
 201                  "-fPIC ignored for target (all code is position independent)"\
 202                  );                                                     \
 203       flag_pic = 1;                                                     \
 204     }                                                                   \
 205   else if (!TARGET_64BIT && flag_pic)                                   \
 206     {                                                                   \
 207       warning (0, "-f%s ignored for target (all code is position independent)",\
 208                (flag_pic > 1) ? "PIC" : "pic");                         \
 209       flag_pic = 0;                                                     \
 210     }                                                                   \
 211 } while (0)
 212
 213 /* Define this macro if references to a symbol must be treated
 214    differently depending on something about the variable or
 215    function named by the symbol (such as what section it is in).
 216
 217    On i386 running Windows NT, modify the assembler name with a suffix
 218    consisting of an atsign (@) followed by string of digits that represents
 219    the number of bytes of arguments passed to the function, if it has the
 220    attribute STDCALL.
 221
 222    In addition, we must mark dll symbols specially. Definitions of
 223    dllexport'd objects install some info in the .drectve section.
 224    References to dllimport'd objects are fetched indirectly via
 225    _imp__.  If both are declared, dllexport overrides.  This is also
 226    needed to implement one-only vtables: they go into their own
 227    section and we need to set DECL_SECTION_NAME so we do that here.
 228    Note that we can be called twice on the same decl.  */
 229
 230 #define SUBTARGET_ENCODE_SECTION_INFO  i386_pe_encode_section_info
 231
 232 /* Local and global relocs can be placed always into readonly memory
 233    for PE-COFF targets.  */
 234 #undef TARGET_ASM_RELOC_RW_MASK
 235 #define TARGET_ASM_RELOC_RW_MASK i386_pe_reloc_rw_mask
 236
 237 /* Output a common block.  */
 238 #undef ASM_OUTPUT_ALIGNED_DECL_COMMON
 239 #define ASM_OUTPUT_ALIGNED_DECL_COMMON \
 240   i386_pe_asm_output_aligned_decl_common
 241
 242 /* Output the label for an initialized variable.  */
 243 #undef ASM_DECLARE_OBJECT_NAME
 244 #define ASM_DECLARE_OBJECT_NAME(STREAM, NAME, DECL)     \
 245 do {                                                    \
 246   i386_pe_maybe_record_exported_symbol (DECL, NAME, 1); \
 247   ASM_OUTPUT_LABEL ((STREAM), (NAME));                  \
 248 } while (0)
 249
 250 /* Output a reference to a label. Fastcall function symbols
 251    keep their '@' prefix, while other symbols are prefixed
 252    with user_label_prefix.  */
 253 #undef ASM_OUTPUT_LABELREF
 254 #define  ASM_OUTPUT_LABELREF(STREAM, NAME)      \
 255 do {                                            \
 256   if ((NAME)[0] != FASTCALL_PREFIX)             \
 257     fputs (user_label_prefix, (STREAM));        \
 258   fputs ((NAME), (STREAM));                     \
 259 } while (0)
 260
 261 /* This does much the same in memory rather than to a stream.  */
 262 #undef TARGET_MANGLE_ASSEMBLER_NAME
 263 #define TARGET_MANGLE_ASSEMBLER_NAME i386_pe_mangle_assembler_name
 264
 265 \f
 266 /* Emit code to check the stack when allocating more than 4000
 267    bytes in one go.  */
 268 #define CHECK_STACK_LIMIT 4000
 269
 270 #undef STACK_BOUNDARY
 271 #define STACK_BOUNDARY  (TARGET_64BIT && ix86_abi == MS_ABI ? 128 : BITS_PER_WORD)
 272
 273 /* By default, target has a 80387, uses IEEE compatible arithmetic,
 274    returns float values in the 387 and needs stack probes.
 275    We also align doubles to 64-bits for MSVC default compatibility.  */
 276
 277 #undef TARGET_SUBTARGET_DEFAULT
 278 #define TARGET_SUBTARGET_DEFAULT \
 279         (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS \
 280          | MASK_STACK_PROBE | MASK_ALIGN_DOUBLE)
 281
 282 #undef TARGET_SUBTARGET64_DEFAULT
 283 #define TARGET_SUBTARGET64_DEFAULT \
 284         MASK_128BIT_LONG_DOUBLE
 285
 286 /* This is how to output an assembler line
 287    that says to advance the location counter
 288    to a multiple of 2**LOG bytes.  */
 289
 290 #undef ASM_OUTPUT_ALIGN
 291 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
 292     if ((LOG)!=0) fprintf ((FILE), "\t.align %d\n", 1<<(LOG))
 293
 294 /* Windows uses explicit import from shared libraries.  */
 295 #define MULTIPLE_SYMBOL_SPACES 1
 296
 297 #define TARGET_ASM_UNIQUE_SECTION i386_pe_unique_section
 298 #define TARGET_ASM_FUNCTION_RODATA_SECTION default_no_function_rodata_section
 299
 300 #define SUPPORTS_ONE_ONLY 1
 301
 302 /* Switch into a generic section.  */
 303 #define TARGET_ASM_NAMED_SECTION  i386_pe_asm_named_section
 304
 305 /* Select attributes for named sections.  */
 306 #define TARGET_SECTION_TYPE_FLAGS  i386_pe_section_type_flags
 307
 308 /* Write the extra assembler code needed to declare a function
 309    properly.  If we are generating SDB debugging information, this
 310    will happen automatically, so we only need to handle other cases.  */
 311 #undef ASM_DECLARE_FUNCTION_NAME
 312 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
 313   i386_pe_start_function (FILE, NAME, DECL)
 314
 315 #undef ASM_DECLARE_FUNCTION_SIZE
 316 #define ASM_DECLARE_FUNCTION_SIZE(FILE,NAME,DECL) \
 317   i386_pe_end_function (FILE, NAME, DECL)
 318
 319 /* Add an external function to the list of functions to be declared at
 320    the end of the file.  */
 321 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME)                           \
 322   do                                                                    \
 323     {                                                                   \
 324       if (TREE_CODE (DECL) == FUNCTION_DECL)                            \
 325         i386_pe_record_external_function ((DECL), (NAME));              \
 326     }                                                                   \
 327   while (0)
 328
 329 /* Declare the type properly for any external libcall.  */
 330 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
 331   i386_pe_declare_function_type (FILE, XSTR (FUN, 0), 1)
 332
 333 /* This says out to put a global symbol in the BSS section.  */
 334 #undef ASM_OUTPUT_ALIGNED_BSS
 335 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 336   asm_output_aligned_bss ((FILE), (DECL), (NAME), (SIZE), (ALIGN))
 337
 338 /* Put all *tf routines in libgcc.  */
 339 #undef LIBGCC2_HAS_TF_MODE
 340 #define LIBGCC2_HAS_TF_MODE 1
 341 #define LIBGCC2_TF_CEXT q
 342 #define TF_SIZE 113
 343
 344 /* Output function declarations at the end of the file.  */
 345 #undef TARGET_ASM_FILE_END
 346 #define TARGET_ASM_FILE_END i386_pe_file_end
 347
 348 #undef ASM_COMMENT_START
 349 #define ASM_COMMENT_START " #"
 350
 351 #ifndef DWARF2_UNWIND_INFO
 352 /* If configured with --disable-sjlj-exceptions, use DWARF2, else
 353    default to SJLJ.  */
 354 #if  (defined (CONFIG_SJLJ_EXCEPTIONS) && !CONFIG_SJLJ_EXCEPTIONS)
 355 /* The logic of this #if must be kept synchronised with the logic
 356    for selecting the tmake_eh_file fragment in config.gcc.  */
 357 #define DWARF2_UNWIND_INFO 1
 358 /* If multilib is selected break build as sjlj is required.  */
 359 #if defined (TARGET_BI_ARCH)
 360 #error For 64-bit windows and 32-bit based multilib version of gcc just SJLJ exceptions are supported.
 361 #endif
 362 #else
 363 #define DWARF2_UNWIND_INFO 0
 364 #endif
 365 #endif
 366
 367 /* Don't assume anything about the header files.  */
 368 #define NO_IMPLICIT_EXTERN_C
 369
 370 #undef PROFILE_HOOK
 371 #define PROFILE_HOOK(LABEL)                                             \
 372   if (MAIN_NAME_P (DECL_NAME (current_function_decl)))                  \
 373     {                                                                   \
 374       emit_call_insn (gen_rtx_CALL (VOIDmode,                           \
 375         gen_rtx_MEM (FUNCTION_MODE,                                     \
 376                      gen_rtx_SYMBOL_REF (Pmode, "_monstartup")),        \
 377         const0_rtx));                                                   \
 378     }
 379
 380 /* Java Native Interface (JNI) methods on Win32 are invoked using the
 381    stdcall calling convention.  */
 382 #undef MODIFY_JNI_METHOD_CALL
 383 #define MODIFY_JNI_METHOD_CALL(MDECL)                                         \
 384   build_type_attribute_variant ((MDECL),                                      \
 385                                build_tree_list (get_identifier ("stdcall"),   \
 386                                                 NULL))
 387
 388 /* For Win32 ABI compatibility */
 389 #undef DEFAULT_PCC_STRUCT_RETURN
 390 #define DEFAULT_PCC_STRUCT_RETURN 0
 391
 392 /* MSVC returns aggregate types of up to 8 bytes via registers.
 393    See i386.c:ix86_return_in_memory.  */
 394 #undef MS_AGGREGATE_RETURN
 395 #define MS_AGGREGATE_RETURN 1
 396
 397 /* Biggest alignment supported by the object file format of this
 398    machine.  Use this macro to limit the alignment which can be
 399    specified using the `__attribute__ ((aligned (N)))' construct.  If
 400    not defined, the default value is `BIGGEST_ALIGNMENT'.  */
 401 /* IMAGE_SCN_ALIGN_8192BYTES is the largest section alignment flag
 402    specified in the PECOFF60 spec.  Native MS compiler also limits
 403    user-specified alignment to 8192 bytes.  */
 404 #undef MAX_OFILE_ALIGNMENT
 405 #define MAX_OFILE_ALIGNMENT (8192 * 8)
 406
 407 /* BIGGEST_FIELD_ALIGNMENT macro is used directly by libobjc, There, we
 408    align internal doubles in structures on dword boundaries. Otherwise,
 409    support vector modes using ADJUST_FIELD_ALIGN, defined in i386.h.  */
 410 #ifdef IN_TARGET_LIBS
 411 #undef  BIGGEST_FIELD_ALIGNMENT
 412 #define BIGGEST_FIELD_ALIGNMENT 64
 413 #endif
 414
 415 /* A bit-field declared as `int' forces `int' alignment for the struct.  */
 416 #undef PCC_BITFIELD_TYPE_MATTERS
 417 #define PCC_BITFIELD_TYPE_MATTERS 1
 418 #define GROUP_BITFIELDS_BY_ALIGN TYPE_NATIVE(rec)
 419
 420 /* Enable alias attribute support.  */
 421 #ifndef SET_ASM_OP
 422 #define SET_ASM_OP "\t.set\t"
 423 #endif
 424
 425 /* This implements the `alias' attribute, keeping any stdcall or
 426    fastcall decoration.  */
 427 #undef  ASM_OUTPUT_DEF_FROM_DECLS
 428 #define ASM_OUTPUT_DEF_FROM_DECLS(STREAM, DECL, TARGET)                 \
 429   do                                                                    \
 430     {                                                                   \
 431       const char *alias                                                 \
 432         = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL));              \
 433       i386_pe_maybe_record_exported_symbol (DECL, alias, 0);            \
 434       if (TREE_CODE (DECL) == FUNCTION_DECL)                            \
 435         i386_pe_declare_function_type (STREAM, alias,                   \
 436                                        TREE_PUBLIC (DECL));             \
 437       ASM_OUTPUT_DEF (STREAM, alias, IDENTIFIER_POINTER (TARGET));      \
 438     } while (0)
 439
 440 /* GNU as supports weak symbols on PECOFF. */
 441 #ifdef HAVE_GAS_WEAK
 442 #define ASM_WEAKEN_LABEL(FILE, NAME)  \
 443   do                                  \
 444     {                                 \
 445       fputs ("\t.weak\t", (FILE));    \
 446       assemble_name ((FILE), (NAME)); \
 447       fputc ('\n', (FILE));           \
 448     }                                 \
 449   while (0)
 450 #endif /* HAVE_GAS_WEAK */
 451
 452 /* FIXME: SUPPORTS_WEAK && TARGET_HAVE_NAMED_SECTIONS is true,
 453    but for .jcr section to work we also need crtbegin and crtend
 454    objects.  */
 455 #define TARGET_USE_JCR_SECTION 1
 456
 457 /* Decide whether it is safe to use a local alias for a virtual function
 458    when constructing thunks.  */
 459 #undef TARGET_USE_LOCAL_THUNK_ALIAS_P
 460 #define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) (!DECL_ONE_ONLY (DECL))
 461
 462 #define SUBTARGET_ATTRIBUTE_TABLE \
 463   { "selectany", 0, 0, true, false, false, ix86_handle_selectany_attribute, \
 464     false }
 465   /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler,
 466        affects_type_identity } */
 467
 468 /*  mcount() does not need a counter variable.  */
 469 #undef NO_PROFILE_COUNTERS
 470 #define NO_PROFILE_COUNTERS 1
 471
 472 #define TARGET_VALID_DLLIMPORT_ATTRIBUTE_P i386_pe_valid_dllimport_attribute_p
 473 #define TARGET_CXX_ADJUST_CLASS_AT_DEFINITION i386_pe_adjust_class_at_definition
 474 #define TARGET_MANGLE_DECL_ASSEMBLER_NAME i386_pe_mangle_decl_assembler_name
 475
 476 #undef TARGET_ASM_ASSEMBLE_VISIBILITY
 477 #define TARGET_ASM_ASSEMBLE_VISIBILITY i386_pe_assemble_visibility
 478
 479 /* Static stack checking is supported by means of probes.  */
 480 #define STACK_CHECK_STATIC_BUILTIN 1