gcc/config/i386/cygwin.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
   4    Free Software Foundation, Inc.
   5
   6 This file is part of GNU CC.
   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 2, 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 GNU CC; see the file COPYING.  If not, write to
  20 the Free Software Foundation, 59 Temple Place - Suite 330,
  21 Boston, MA 02111-1307, USA. */
  22
  23 #define YES_UNDERSCORES
  24
  25 #define DBX_DEBUGGING_INFO
  26 #define SDB_DEBUGGING_INFO
  27 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
  28
  29 #define TARGET_EXECUTABLE_SUFFIX ".exe"
  30
  31 #include <stdio.h>
  32 #include "i386/gas.h"
  33 #include "dbxcoff.h"
  34
  35 /* Augment TARGET_SWITCHES with the cygwin/no-cygwin options. */
  36 #define MASK_WIN32 0x40000000 /* Use -lming32 interface */
  37 #define MASK_CYGWIN  0x20000000 /* Use -lcygwin interface */
  38 #define MASK_WINDOWS 0x10000000 /* Use windows interface */
  39 #define MASK_DLL     0x08000000 /* Use dll interface    */
  40 #define MASK_NOP_FUN_DLLIMPORT 0x20000 /* Ignore dllimport for functions */
  41
  42 #define TARGET_WIN32             (target_flags & MASK_WIN32)
  43 #define TARGET_CYGWIN            (target_flags & MASK_CYGWIN)
  44 #define TARGET_WINDOWS           (target_flags & MASK_WINDOWS)
  45 #define TARGET_DLL               (target_flags & MASK_DLL)
  46 #define TARGET_NOP_FUN_DLLIMPORT (target_flags & MASK_NOP_FUN_DLLIMPORT)
  47
  48 #undef  SUBTARGET_SWITCHES
  49 #define SUBTARGET_SWITCHES \
  50 { "cygwin",               MASK_CYGWIN,                                  \
  51   N_("Use the Cygwin interface") },                                     \
  52 { "no-cygwin",            MASK_WIN32,                                   \
  53   N_("Use the Mingw32 interface") },                                    \
  54 { "windows",              MASK_WINDOWS, N_("Create GUI application") }, \
  55 { "no-win32",             -MASK_WIN32, N_("Don't set Windows defines") },\
  56 { "win32",                0, N_("Set Windows defines") },               \
  57 { "console",              -MASK_WINDOWS,                                \
  58   N_("Create console application") },                                   \
  59 { "dll",                  MASK_DLL, N_("Generate code for a DLL") },    \
  60 { "nop-fun-dllimport",    MASK_NOP_FUN_DLLIMPORT,                       \
  61   N_("Ignore dllimport for functions") },                               \
  62 { "no-nop-fun-dllimport", -MASK_NOP_FUN_DLLIMPORT, "" }, \
  63 { "threads",              0, N_("Use Mingw-specific thread support") },
  64
  65 #undef CPP_PREDEFINES
  66 #define CPP_PREDEFINES "-D_X86_=1 -Asystem=winnt"
  67
  68 #ifdef CROSS_COMPILE
  69 #define CYGWIN_INCLUDES "-idirafter " CYGWIN_CROSS_DIR "/include"
  70 #define W32API_INC "-idirafter " CYGWIN_CROSS_DIR "/include/w32api"
  71 #define W32API_LIB "-L" CYGWIN_CROSS_DIR "/lib/w32api/"
  72 #define CYGWIN_LIB CYGWIN_CROSS_DIR "/lib"
  73 #define MINGW_LIBS "-L" CYGWIN_CROSS_DIR "/lib/mingw"
  74 #define MINGW_INCLUDES "-isystem " CYGWIN_CROSS_DIR "/include/mingw/g++-3 "\
  75                        "-isystem " CYGWIN_CROSS_DIR "/include/mingw/g++ "\
  76                        "-idirafter " CYGWIN_CROSS_DIR "/include/mingw"
  77 #else
  78 #define CYGWIN_INCLUDES "-isystem /usr/local/include -idirafter /usr/include"
  79 #define W32API_INC "-idirafter /usr/include/w32api"
  80 #define W32API_LIB "-L/usr/lib/w32api/"
  81 #define CYGWIN_LIB "/usr/lib"
  82 #define MINGW_LIBS "-L/usr/local/lib/mingw -L/usr/lib/mingw"
  83 #define MINGW_INCLUDES "-isystem /usr/include/mingw/g++-3 "\
  84                        "-isystem /usr/include/mingw/g++ "\
  85                        "-isystem /usr/local/include/mingw" \
  86                        "-idirafter /usr/include/mingw"
  87 #endif
  88
  89 /* Get tree.c to declare a target-specific specialization of
  90    merge_decl_attributes.  */
  91 #define TARGET_DLLIMPORT_DECL_ATTRIBUTES
  92
  93 /* Support the __declspec keyword by turning them into attributes.
  94    We currently only support: dllimport and dllexport.
  95    Note that the current way we do this may result in a collision with
  96    predefined attributes later on.  This can be solved by using one attribute,
  97    say __declspec__, and passing args to it.  The problem with that approach
  98    is that args are not accumulated: each new appearance would clobber any
  99    existing args.  */
 100
 101 #undef CPP_SPEC
 102 #define CPP_SPEC "%(cpp_cpu) %{posix:-D_POSIX_SOURCE} \
 103   -D__stdcall=__attribute__((__stdcall__)) \
 104   -D__cdecl=__attribute__((__cdecl__)) \
 105   %{!ansi:-D_stdcall=__attribute__((__stdcall__)) \
 106     -D_cdecl=__attribute__((__cdecl__))} \
 107   -D__declspec(x)=__attribute__((x)) \
 108   -D__i386__ -D__i386 \
 109   %{mno-win32:%{mno-cygwin: %emno-cygwin and mno-win32 are not compatible}} \
 110   %{mno-cygwin:-D__MSVCRT__ -D__MINGW32__ %{mthreads:-D_MT} "\
 111     MINGW_INCLUDES "} \
 112   %{!mno-cygwin:-D__CYGWIN32__ -D__CYGWIN__ -Dunix -D__unix__ -D__unix "\
 113     CYGWIN_INCLUDES "}\
 114   %{mwin32|mno-cygwin:-DWIN32 -D_WIN32 -D__WIN32 -D__WIN32__ -DWINNT}\
 115   %{!mno-win32:" W32API_INC "}\
 116 "
 117
 118 #undef STARTFILE_SPEC
 119 #define STARTFILE_SPEC "\
 120   %{shared|mdll: %{mno-cygwin:" MINGW_LIBS " mingw/dllcrt2%O%s}}\
 121   %{!shared: %{!mdll: %{!mno-cygwin:crt0%O%s} %{mno-cygwin:" MINGW_LIBS " mingw/crt2%O%s}\
 122   %{pg:gcrt0%O%s}}}\
 123 "
 124
 125 /* Normally, -lgcc is not needed since everything in it is in the DLL, but we
 126    want to allow things to be added to it when installing new versions of
 127    GCC without making a new CYGWIN.DLL, so we leave it.  Profiling is handled
 128    by calling the init function from the prologue. */
 129
 130 #undef LIBGCC_SPEC
 131 #define LIBGCC_SPEC "%{mno-cygwin: %{mthreads:-lmingwthrd} -lmingw32} -lgcc %{mno-cygwin:-lmoldname -lmsvcrt}"
 132
 133 /* This macro defines names of additional specifications to put in the specs
 134    that can be used in various specifications like CC1_SPEC.  Its definition
 135    is an initializer with a subgrouping for each command option.
 136
 137    Each subgrouping contains a string constant, that defines the
 138    specification name, and a string constant that used by the GNU CC driver
 139    program.
 140
 141    Do not define this macro if it does not need to do anything.  */
 142
 143 #undef  SUBTARGET_EXTRA_SPECS
 144 #define SUBTARGET_EXTRA_SPECS                                           \
 145   { "mingw_include_path", DEFAULT_TARGET_MACHINE }
 146
 147 /* We have to dynamic link to get to the system DLLs.  All of libc, libm and
 148    the Unix stuff is in cygwin.dll.  The import library is called
 149    'libcygwin.a'.  For Windows applications, include more libraries, but
 150    always include kernel32.  We'd like to specific subsystem windows to
 151    ld, but that doesn't work just yet.  */
 152
 153 #undef LIB_SPEC
 154 #define LIB_SPEC "\
 155   %{pg:-lgmon} \
 156   %{!mno-cygwin:-lcygwin} \
 157   %{mno-cygwin:%{mthreads:-lmingwthrd} -lmingw32} \
 158   %{mwindows:-lgdi32 -lcomdlg32} \
 159   -luser32 -lkernel32 -ladvapi32 -lshell32"
 160
 161 #define LINK_SPEC W32API_LIB "\
 162   %{mwindows:--subsystem windows} \
 163   %{mconsole:--subsystem console} \
 164   %{shared: %{mdll: %eshared and mdll are not compatible}} \
 165   %{shared: --shared} %{mdll:--dll} \
 166   %{static:-Bstatic} %{!static:-Bdynamic} \
 167   %{shared|mdll: -e \
 168     %{mno-cygwin:_DllMainCRTStartup@12} \
 169     %{!mno-cygwin:__cygwin_dll_entry@12}}\
 170   --dll-search-prefix=cyg"
 171
 172 #undef MATH_LIBRARY
 173 #define MATH_LIBRARY ""
 174
 175 #define SIZE_TYPE "unsigned int"
 176 #define PTRDIFF_TYPE "int"
 177 #define WCHAR_UNSIGNED 1
 178 #define WCHAR_TYPE_SIZE 16
 179 #define WCHAR_TYPE "short unsigned int"
 180
 181 \f
 182 /* Enable parsing of #pragma pack(push,<n>) and #pragma pack(pop).  */
 183 #define HANDLE_PRAGMA_PACK_PUSH_POP 1
 184
 185 union tree_node;
 186 #define TREE union tree_node *
 187
 188 /* Used to implement dllexport overriding dllimport semantics.  It's also used
 189    to handle vtables - the first pass won't do anything because
 190    DECL_CONTEXT (DECL) will be 0 so i386_pe_dll{ex,im}port_p will return 0.
 191    It's also used to handle dllimport override semantics.  */
 192 #if 0
 193 #define REDO_SECTION_INFO_P(DECL) \
 194   ((DECL_ATTRIBUTES (DECL) != NULL_TREE) \
 195    || (TREE_CODE (DECL) == VAR_DECL && DECL_VIRTUAL_P (DECL)))
 196 #else
 197 #define REDO_SECTION_INFO_P(DECL) 1
 198 #endif
 199
 200 \f
 201 #undef EXTRA_SECTIONS
 202 #define EXTRA_SECTIONS in_drectve
 203
 204 #undef EXTRA_SECTION_FUNCTIONS
 205 #define EXTRA_SECTION_FUNCTIONS                                 \
 206   DRECTVE_SECTION_FUNCTION                                      \
 207   SWITCH_TO_SECTION_FUNCTION
 208
 209 #define DRECTVE_SECTION_FUNCTION \
 210 void                                                                    \
 211 drectve_section ()                                                      \
 212 {                                                                       \
 213   if (in_section != in_drectve)                                         \
 214     {                                                                   \
 215       fprintf (asm_out_file, "%s\n", "\t.section .drectve\n");          \
 216       in_section = in_drectve;                                          \
 217     }                                                                   \
 218 }
 219 void drectve_section PARAMS ((void));
 220
 221 /* Switch to SECTION (an `enum in_section').
 222
 223    ??? This facility should be provided by GCC proper.
 224    The problem is that we want to temporarily switch sections in
 225    ASM_DECLARE_OBJECT_NAME and then switch back to the original section
 226    afterwards.  */
 227 #define SWITCH_TO_SECTION_FUNCTION                              \
 228 void switch_to_section PARAMS ((enum in_section, tree));        \
 229 void                                                            \
 230 switch_to_section (section, decl)                               \
 231      enum in_section section;                                   \
 232      tree decl;                                                 \
 233 {                                                               \
 234   switch (section)                                              \
 235     {                                                           \
 236       case in_text: text_section (); break;                     \
 237       case in_data: data_section (); break;                     \
 238       case in_named: named_section (decl, NULL, 0); break;      \
 239       case in_drectve: drectve_section (); break;               \
 240       default: abort (); break;                                 \
 241     }                                                           \
 242 }
 243
 244 /* Don't allow flag_pic to propagate since gas may produce invalid code
 245    otherwise. */
 246
 247 #undef  SUBTARGET_OVERRIDE_OPTIONS
 248 #define SUBTARGET_OVERRIDE_OPTIONS                                      \
 249 do {                                                                    \
 250   if (flag_pic)                                                         \
 251     {                                                                   \
 252       warning ("-f%s ignored for target (all code is position independent)",\
 253                (flag_pic > 1) ? "PIC" : "pic");                         \
 254       flag_pic = 0;                                                     \
 255     }                                                                   \
 256 } while (0)                                                             \
 257
 258 /* Define this macro if references to a symbol must be treated
 259    differently depending on something about the variable or
 260    function named by the symbol (such as what section it is in).
 261
 262    On i386 running Windows NT, modify the assembler name with a suffix
 263    consisting of an atsign (@) followed by string of digits that represents
 264    the number of bytes of arguments passed to the function, if it has the
 265    attribute STDCALL.
 266
 267    In addition, we must mark dll symbols specially. Definitions of
 268    dllexport'd objects install some info in the .drectve section.
 269    References to dllimport'd objects are fetched indirectly via
 270    _imp__.  If both are declared, dllexport overrides.  This is also
 271    needed to implement one-only vtables: they go into their own
 272    section and we need to set DECL_SECTION_NAME so we do that here.
 273    Note that we can be called twice on the same decl.  */
 274
 275 extern void i386_pe_encode_section_info PARAMS ((TREE));
 276
 277 #ifdef ENCODE_SECTION_INFO
 278 #undef ENCODE_SECTION_INFO
 279 #endif
 280 #define ENCODE_SECTION_INFO(DECL) i386_pe_encode_section_info (DECL)
 281
 282 /* Utility used only in this file.  */
 283 #define I386_PE_STRIP_ENCODING(SYM_NAME) \
 284   ((SYM_NAME) + ((SYM_NAME)[0] == '@' ? 3 : 0))
 285
 286 /* This macro gets just the user-specified name
 287    out of the string in a SYMBOL_REF.  Discard
 288    trailing @[NUM] encoded by ENCODE_SECTION_INFO.  */
 289 #undef  STRIP_NAME_ENCODING
 290 #define STRIP_NAME_ENCODING(VAR,SYMBOL_NAME)                            \
 291 do {                                                                    \
 292   const char *_p;                                                       \
 293   const char *_name = I386_PE_STRIP_ENCODING (SYMBOL_NAME);             \
 294   for (_p = _name; *_p && *_p != '@'; ++_p)                             \
 295     ;                                                                   \
 296   if (*_p == '@')                                                       \
 297     {                                                                   \
 298       int _len = _p - _name;                                            \
 299       char *_new_name = (char *) alloca (_len + 1);                     \
 300       strncpy (_new_name, _name, _len);                                 \
 301       _new_name[_len] = '\0';                                           \
 302       (VAR) = _new_name;                                                \
 303     }                                                                   \
 304   else                                                                  \
 305     (VAR) = _name;                                                      \
 306 } while (0)
 307
 308 \f
 309 /* Output a reference to a label.  */
 310 #undef ASM_OUTPUT_LABELREF
 311 #define ASM_OUTPUT_LABELREF(STREAM, NAME)               \
 312   fprintf (STREAM, "%s%s", USER_LABEL_PREFIX,           \
 313            I386_PE_STRIP_ENCODING (NAME))               \
 314
 315 /* Output a common block.  */
 316 #undef ASM_OUTPUT_COMMON
 317 #define ASM_OUTPUT_COMMON(STREAM, NAME, SIZE, ROUNDED)  \
 318 do {                                                    \
 319   if (i386_pe_dllexport_name_p (NAME))                  \
 320     i386_pe_record_exported_symbol (NAME, 1);           \
 321   if (! i386_pe_dllimport_name_p (NAME))                \
 322     {                                                   \
 323       fprintf ((STREAM), "\t.comm\t");                  \
 324       assemble_name ((STREAM), (NAME));                 \
 325       fprintf ((STREAM), ", %d\t%s %d\n",               \
 326                (ROUNDED), ASM_COMMENT_START, (SIZE));   \
 327     }                                                   \
 328 } while (0)
 329
 330 /* Output the label for an initialized variable.  */
 331 #undef ASM_DECLARE_OBJECT_NAME
 332 #define ASM_DECLARE_OBJECT_NAME(STREAM, NAME, DECL)     \
 333 do {                                                    \
 334   if (i386_pe_dllexport_name_p (NAME))                  \
 335     i386_pe_record_exported_symbol (NAME, 1);           \
 336   ASM_OUTPUT_LABEL ((STREAM), (NAME));                  \
 337 } while (0)
 338
 339 \f
 340 /* Emit code to check the stack when allocating more that 4000
 341    bytes in one go. */
 342
 343 #define CHECK_STACK_LIMIT 4000
 344
 345 /* By default, target has a 80387, uses IEEE compatible arithmetic,
 346    and returns float values in the 387 and needs stack probes */
 347 #undef TARGET_SUBTARGET_DEFAULT
 348
 349 #define TARGET_SUBTARGET_DEFAULT \
 350    (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_STACK_PROBE)
 351
 352 /* This is how to output an assembler line
 353    that says to advance the location counter
 354    to a multiple of 2**LOG bytes.  */
 355
 356 #undef ASM_OUTPUT_ALIGN
 357 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
 358     if ((LOG)!=0) fprintf ((FILE), "\t.align %d\n", 1<<(LOG))
 359
 360 /* Define this macro if in some cases global symbols from one translation
 361    unit may not be bound to undefined symbols in another translation unit
 362    without user intervention.  For instance, under Microsoft Windows
 363    symbols must be explicitly imported from shared libraries (DLLs).  */
 364 #define MULTIPLE_SYMBOL_SPACES
 365
 366 extern void i386_pe_unique_section PARAMS ((TREE, int));
 367 #define UNIQUE_SECTION(DECL,RELOC) i386_pe_unique_section (DECL, RELOC)
 368
 369 #define SUPPORTS_ONE_ONLY 1
 370
 371 /* Switch into a generic section.  */
 372 #define TARGET_ASM_NAMED_SECTION  i386_pe_asm_named_section
 373
 374 /* Select attributes for named sections.  */
 375 #define TARGET_SECTION_TYPE_FLAGS  i386_pe_section_type_flags
 376
 377 /* Write the extra assembler code needed to declare a function
 378    properly.  If we are generating SDB debugging information, this
 379    will happen automatically, so we only need to handle other cases.  */
 380 #undef ASM_DECLARE_FUNCTION_NAME
 381 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)                     \
 382   do                                                                    \
 383     {                                                                   \
 384       if (i386_pe_dllexport_name_p (NAME))                              \
 385         i386_pe_record_exported_symbol (NAME, 0);                       \
 386       if (write_symbols != SDB_DEBUG)                                   \
 387         i386_pe_declare_function_type (FILE, NAME, TREE_PUBLIC (DECL)); \
 388       ASM_OUTPUT_LABEL (FILE, NAME);                                    \
 389     }                                                                   \
 390   while (0)
 391
 392 /* Add an external function to the list of functions to be declared at
 393    the end of the file.  */
 394 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME)                           \
 395   do                                                                    \
 396     {                                                                   \
 397       if (TREE_CODE (DECL) == FUNCTION_DECL)                            \
 398         i386_pe_record_external_function (NAME);                        \
 399     }                                                                   \
 400   while (0)
 401
 402 /* Declare the type properly for any external libcall.  */
 403 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
 404   i386_pe_declare_function_type (FILE, XSTR (FUN, 0), 1)
 405
 406 /* This says out to put a global symbol in the BSS section. */
 407 #undef ASM_OUTPUT_ALIGNED_BSS
 408 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 409   asm_output_aligned_bss ((FILE), (DECL), (NAME), (SIZE), (ALIGN))
 410
 411 /* Output function declarations at the end of the file.  */
 412 #undef ASM_FILE_END
 413 #define ASM_FILE_END(FILE) \
 414   i386_pe_asm_file_end (FILE)
 415
 416 #undef ASM_COMMENT_START
 417 #define ASM_COMMENT_START " #"
 418
 419 /* Don't assume anything about the header files. */
 420 #define NO_IMPLICIT_EXTERN_C
 421
 422 #define SUBTARGET_PROLOGUE                                              \
 423   if (profile_flag                                                      \
 424       && MAIN_NAME_P (DECL_NAME (current_function_decl)))               \
 425      {                                                                  \
 426       emit_call_insn (gen_rtx (CALL, VOIDmode,                          \
 427         gen_rtx_MEM (FUNCTION_MODE,                                     \
 428                      gen_rtx_SYMBOL_REF (Pmode, "_monstartup")),        \
 429         const0_rtx));                                                   \
 430      }
 431
 432 /* External function declarations.  */
 433
 434 extern void i386_pe_record_external_function PARAMS ((const char *));
 435 extern void i386_pe_declare_function_type PARAMS ((FILE *, const char *, int));
 436 extern void i386_pe_record_exported_symbol PARAMS ((const char *, int));
 437 extern void i386_pe_asm_file_end PARAMS ((FILE *));
 438 extern int i386_pe_dllexport_name_p PARAMS ((const char *));
 439 extern int i386_pe_dllimport_name_p PARAMS ((const char *));
 440
 441 /* For Win32 ABI compatibility */
 442 #undef DEFAULT_PCC_STRUCT_RETURN
 443 #define DEFAULT_PCC_STRUCT_RETURN 0
 444
 445 /* No data type wants to be aligned rounder than this.  */
 446 #undef  BIGGEST_ALIGNMENT
 447 #define BIGGEST_ALIGNMENT 128
 448
 449 /* Native complier aligns internal doubles in structures on dword boundaries.  */
 450 #undef  BIGGEST_FIELD_ALIGNMENT
 451 #define BIGGEST_FIELD_ALIGNMENT 64
 452
 453 /* A bitfield declared as `int' forces `int' alignment for the struct.  */
 454 #undef PCC_BITFIELDS_TYPE_MATTERS
 455 #define PCC_BITFIELDS_TYPE_MATTERS 1
 456 #define GROUP_BITFIELDS_BY_ALIGN TYPE_NATIVE(rec)
 457
 458
 459 /* Enable alias attribute support.  */
 460 #ifndef SET_ASM_OP
 461 #define SET_ASM_OP "\t.set\t"
 462 #endif
 463
 464 #undef MD_STARTFILE_PREFIX
 465 #define MD_STARTFILE_PREFIX     "/usr/lib/"
 466
 467 #undef STANDARD_STARTFILE_PREFIX
 468 #define STANDARD_STARTFILE_PREFIX     "/usr/lib/mingw/"
 469
 470 #ifndef CROSS_COMPILE
 471 #undef LOCAL_INCLUDE_DIR
 472 #undef TOOL_INCLUDE_DIR
 473 #undef SYSTEM_INCLUDE_DIR
 474 #undef STANDARD_INCLUDE_DIR
 475 #define STANDARD_INCLUDE_DIR 0
 476 #endif
 477
 478 #undef TREE
 479
 480 #ifndef BUFSIZ
 481 # undef FILE
 482 #endif