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, 2002, 2003
   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 DBX_DEBUGGING_INFO 1
  24 #define SDB_DEBUGGING_INFO 1
  25 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
  26
  27 #define TARGET_VERSION fprintf (stderr, " (x86 Cygwin)");
  28 #define TARGET_EXECUTABLE_SUFFIX ".exe"
  29
  30 #include <stdio.h>
  31 #include "i386/i386.h"
  32 #include "i386/unix.h"
  33 #include "i386/bsd.h"
  34 #include "i386/gas.h"
  35 #include "dbxcoff.h"
  36
  37 /* Masks for subtarget switches used by other files.  */
  38 #define MASK_NOP_FUN_DLLIMPORT 0x08000000 /* Ignore dllimport for functions */
  39
  40 /* Used in winnt.c.  */
  41 #define TARGET_NOP_FUN_DLLIMPORT (target_flags & MASK_NOP_FUN_DLLIMPORT)
  42
  43 #undef  SUBTARGET_SWITCHES
  44 #define SUBTARGET_SWITCHES \
  45 { "cygwin",               0, N_("Use the Cygwin interface") },  \
  46 { "no-cygwin",            0, N_("Use the Mingw32 interface") }, \
  47 { "windows",              0, N_("Create GUI application") },    \
  48 { "no-win32",             0, N_("Don't set Windows defines") }, \
  49 { "win32",                0, N_("Set Windows defines") },       \
  50 { "console",              0, N_("Create console application") },\
  51 { "dll",                  0, N_("Generate code for a DLL") },   \
  52 { "nop-fun-dllimport",    MASK_NOP_FUN_DLLIMPORT,               \
  53   N_("Ignore dllimport for functions") },                       \
  54 { "no-nop-fun-dllimport", -MASK_NOP_FUN_DLLIMPORT, "" },        \
  55 { "threads",              0, N_("Use Mingw-specific thread support") },
  56
  57 #define MAYBE_UWIN_CPP_BUILTINS() /* Nothing.  */
  58 #define TARGET_OS_CPP_BUILTINS()                                        \
  59   do                                                                    \
  60     {                                                                   \
  61         builtin_define ("_X86_=1");                                     \
  62         builtin_assert ("system=winnt");                                \
  63         builtin_define ("__stdcall=__attribute__((__stdcall__))");      \
  64         builtin_define ("__fastcall=__attribute__((__fastcall__))");    \
  65         builtin_define ("__cdecl=__attribute__((__cdecl__))");          \
  66         builtin_define ("__declspec(x)=__attribute__((x))");            \
  67         if (!flag_iso)                                                  \
  68           {                                                             \
  69             builtin_define ("_stdcall=__attribute__((__stdcall__))");   \
  70             builtin_define ("_fastcall=__attribute__((__fastcall__))"); \
  71             builtin_define ("_cdecl=__attribute__((__cdecl__))");       \
  72           }                                                             \
  73         MAYBE_UWIN_CPP_BUILTINS ();                                     \
  74     }                                                                   \
  75   while (0)
  76
  77 #ifdef CROSS_COMPILE
  78 #define CYGWIN_INCLUDES "%{!nostdinc:-idirafter " CYGWIN_CROSS_DIR "/include}"
  79 #define W32API_INC "%{!nostdinc:-idirafter " CYGWIN_CROSS_DIR "/include/w32api}"
  80 #define W32API_LIB "-L" CYGWIN_CROSS_DIR "/lib/w32api/"
  81 #define CYGWIN_LIB CYGWIN_CROSS_DIR "/lib"
  82 #define MINGW_LIBS "-L" CYGWIN_CROSS_DIR "/lib/mingw"
  83 #define MINGW_INCLUDES "%{!nostdinc:-isystem " CYGWIN_CROSS_DIR "/include/mingw/g++-3 "\
  84                        "-isystem " CYGWIN_CROSS_DIR "/include/mingw/g++ "\
  85                        "-idirafter " CYGWIN_CROSS_DIR "/include/mingw}"
  86 #else
  87 #define CYGWIN_INCLUDES "%{!nostdinc:-isystem /usr/local/include "\
  88                            "-idirafter " CYGWIN_CROSS_DIR "/include "\
  89                            "-idirafter /usr/include}"
  90 #define W32API_INC "%{!nostdinc:"\
  91                       "-idirafter " CYGWIN_CROSS_DIR "/include/w32api "\
  92                       "-idirafter /usr/include/w32api}"
  93 #define W32API_LIB "-L" CYGWIN_CROSS_DIR "/lib/w32api/ -L/usr/lib/w32api/"
  94 #define CYGWIN_LIB "/usr/lib"
  95 #define MINGW_LIBS "-L/usr/local/lib/mingw -L/usr/lib/mingw"
  96 #define MINGW_INCLUDES "%{!nostdinc:-isystem /usr/include/mingw/g++-3 "\
  97                        "-isystem /usr/include/mingw/g++ "\
  98                        "-isystem /usr/local/include/mingw "\
  99                        "-idirafter " CYGWIN_CROSS_DIR "/include/mingw "\
 100                        "-idirafter /usr/include/mingw}"
 101 #endif
 102
 103 /* Get tree.c to declare a target-specific specialization of
 104    merge_decl_attributes.  */
 105 #define TARGET_DLLIMPORT_DECL_ATTRIBUTES
 106
 107 /* Support the __declspec keyword by turning them into attributes.
 108    We currently only support: dllimport and dllexport.
 109    Note that the current way we do this may result in a collision with
 110    predefined attributes later on.  This can be solved by using one attribute,
 111    say __declspec__, and passing args to it.  The problem with that approach
 112    is that args are not accumulated: each new appearance would clobber any
 113    existing args.  */
 114
 115 #undef CPP_SPEC
 116 #define CPP_SPEC "%{posix:-D_POSIX_SOURCE} \
 117   %{mno-win32:%{mno-cygwin: %emno-cygwin and mno-win32 are not compatible}} \
 118   %{mno-cygwin:-D__MSVCRT__ -D__MINGW32__ %{mthreads:-D_MT} "\
 119     MINGW_INCLUDES "} \
 120   %{!mno-cygwin:-D__CYGWIN32__ -D__CYGWIN__ %{!ansi:-Dunix} -D__unix__ -D__unix "\
 121     CYGWIN_INCLUDES "}\
 122   %{mwin32|mno-cygwin:-DWIN32 -D_WIN32 -D__WIN32 -D__WIN32__ %{!ansi:-DWINNT}}\
 123   %{!mno-win32:" W32API_INC "}\
 124 "
 125
 126 #undef STARTFILE_SPEC
 127 #define STARTFILE_SPEC "\
 128   %{shared|mdll: %{mno-cygwin:" MINGW_LIBS " dllcrt2%O%s}}\
 129   %{!shared: %{!mdll: %{!mno-cygwin:crt0%O%s} %{mno-cygwin:" MINGW_LIBS " crt2%O%s}\
 130   %{pg:gcrt0%O%s}}}\
 131 "
 132
 133 /* Normally, -lgcc is not needed since everything in it is in the DLL, but we
 134    want to allow things to be added to it when installing new versions of
 135    GCC without making a new CYGWIN.DLL, so we leave it.  Profiling is handled
 136    by calling the init function from the prologue.  */
 137
 138 #undef LIBGCC_SPEC
 139 #define LIBGCC_SPEC "%{mno-cygwin: %{mthreads:-lmingwthrd} -lmingw32}   \
 140   -lgcc %{mno-cygwin:-lmoldname -lmingwex -lmsvcrt}"
 141
 142 /* This macro defines names of additional specifications to put in the specs
 143    that can be used in various specifications like CC1_SPEC.  Its definition
 144    is an initializer with a subgrouping for each command option.
 145
 146    Each subgrouping contains a string constant, that defines the
 147    specification name, and a string constant that used by the GNU CC driver
 148    program.
 149
 150    Do not define this macro if it does not need to do anything.  */
 151
 152 #undef  SUBTARGET_EXTRA_SPECS
 153 #define SUBTARGET_EXTRA_SPECS                                           \
 154   { "mingw_include_path", DEFAULT_TARGET_MACHINE }
 155
 156 /* We have to dynamic link to get to the system DLLs.  All of libc, libm and
 157    the Unix stuff is in cygwin.dll.  The import library is called
 158    'libcygwin.a'.  For Windows applications, include more libraries, but
 159    always include kernel32.  We'd like to specific subsystem windows to
 160    ld, but that doesn't work just yet.  */
 161
 162 #undef LIB_SPEC
 163 #define LIB_SPEC "\
 164   %{pg:-lgmon} \
 165   %{!mno-cygwin:-lcygwin} \
 166   %{mno-cygwin:%{mthreads:-lmingwthrd} -lmingw32} \
 167   %{mwindows:-lgdi32 -lcomdlg32} \
 168   -luser32 -lkernel32 -ladvapi32 -lshell32"
 169
 170 #define LINK_SPEC W32API_LIB "\
 171   %{mwindows:--subsystem windows} \
 172   %{mconsole:--subsystem console} \
 173   %{shared: %{mdll: %eshared and mdll are not compatible}} \
 174   %{shared: --shared} %{mdll:--dll} \
 175   %{static:-Bstatic} %{!static:-Bdynamic} \
 176   %{shared|mdll: -e \
 177     %{mno-cygwin:_DllMainCRTStartup@12} \
 178     %{!mno-cygwin:__cygwin_dll_entry@12}}\
 179   --dll-search-prefix=cyg"
 180
 181 #undef MATH_LIBRARY
 182 #define MATH_LIBRARY ""
 183
 184 #define SIZE_TYPE "unsigned int"
 185 #define PTRDIFF_TYPE "int"
 186 #define WCHAR_TYPE_SIZE 16
 187 #define WCHAR_TYPE "short unsigned int"
 188
 189 \f
 190 /* Enable parsing of #pragma pack(push,<n>) and #pragma pack(pop).  */
 191 #define HANDLE_PRAGMA_PACK_PUSH_POP 1
 192
 193 union tree_node;
 194 #define TREE union tree_node *
 195 \f
 196 #undef EXTRA_SECTIONS
 197 #define EXTRA_SECTIONS in_drectve
 198
 199 #undef EXTRA_SECTION_FUNCTIONS
 200 #define EXTRA_SECTION_FUNCTIONS                                 \
 201   DRECTVE_SECTION_FUNCTION                                      \
 202   SWITCH_TO_SECTION_FUNCTION
 203
 204 #define DRECTVE_SECTION_FUNCTION \
 205 void                                                                    \
 206 drectve_section ()                                                      \
 207 {                                                                       \
 208   if (in_section != in_drectve)                                         \
 209     {                                                                   \
 210       fprintf (asm_out_file, "%s\n", "\t.section .drectve\n");          \
 211       in_section = in_drectve;                                          \
 212     }                                                                   \
 213 }
 214 void drectve_section PARAMS ((void));
 215
 216 /* Switch to SECTION (an `enum in_section').
 217
 218    ??? This facility should be provided by GCC proper.
 219    The problem is that we want to temporarily switch sections in
 220    ASM_DECLARE_OBJECT_NAME and then switch back to the original section
 221    afterwards.  */
 222 #define SWITCH_TO_SECTION_FUNCTION                              \
 223 void switch_to_section PARAMS ((enum in_section, tree));        \
 224 void                                                            \
 225 switch_to_section (section, decl)                               \
 226      enum in_section section;                                   \
 227      tree decl;                                                 \
 228 {                                                               \
 229   switch (section)                                              \
 230     {                                                           \
 231       case in_text: text_section (); break;                     \
 232       case in_data: data_section (); break;                     \
 233       case in_named: named_section (decl, NULL, 0); break;      \
 234       case in_drectve: drectve_section (); break;               \
 235       default: abort (); break;                                 \
 236     }                                                           \
 237 }
 238
 239 /* Don't allow flag_pic to propagate since gas may produce invalid code
 240    otherwise.  */
 241
 242 #undef  SUBTARGET_OVERRIDE_OPTIONS
 243 #define SUBTARGET_OVERRIDE_OPTIONS                                      \
 244 do {                                                                    \
 245   if (flag_pic)                                                         \
 246     {                                                                   \
 247       warning ("-f%s ignored for target (all code is position independent)",\
 248                (flag_pic > 1) ? "PIC" : "pic");                         \
 249       flag_pic = 0;                                                     \
 250     }                                                                   \
 251 } while (0)                                                             \
 252
 253 /* Define this macro if references to a symbol must be treated
 254    differently depending on something about the variable or
 255    function named by the symbol (such as what section it is in).
 256
 257    On i386 running Windows NT, modify the assembler name with a suffix
 258    consisting of an atsign (@) followed by string of digits that represents
 259    the number of bytes of arguments passed to the function, if it has the
 260    attribute STDCALL.
 261
 262    In addition, we must mark dll symbols specially. Definitions of
 263    dllexport'd objects install some info in the .drectve section.
 264    References to dllimport'd objects are fetched indirectly via
 265    _imp__.  If both are declared, dllexport overrides.  This is also
 266    needed to implement one-only vtables: they go into their own
 267    section and we need to set DECL_SECTION_NAME so we do that here.
 268    Note that we can be called twice on the same decl.  */
 269
 270 #undef TARGET_ENCODE_SECTION_INFO
 271 #define TARGET_ENCODE_SECTION_INFO  i386_pe_encode_section_info
 272 #undef  TARGET_STRIP_NAME_ENCODING
 273 #define TARGET_STRIP_NAME_ENCODING  i386_pe_strip_name_encoding_full
 274 \f
 275 /* Output a reference to a label.  */
 276 #undef ASM_OUTPUT_LABELREF
 277 #define ASM_OUTPUT_LABELREF  i386_pe_output_labelref
 278
 279 /* Output a common block.  */
 280 #undef ASM_OUTPUT_COMMON
 281 #define ASM_OUTPUT_COMMON(STREAM, NAME, SIZE, ROUNDED)  \
 282 do {                                                    \
 283   if (i386_pe_dllexport_name_p (NAME))                  \
 284     i386_pe_record_exported_symbol (NAME, 1);           \
 285   if (! i386_pe_dllimport_name_p (NAME))                \
 286     {                                                   \
 287       fprintf ((STREAM), "\t.comm\t");                  \
 288       assemble_name ((STREAM), (NAME));                 \
 289       fprintf ((STREAM), ", %d\t%s %d\n",               \
 290                (ROUNDED), ASM_COMMENT_START, (SIZE));   \
 291     }                                                   \
 292 } while (0)
 293
 294 /* Output the label for an initialized variable.  */
 295 #undef ASM_DECLARE_OBJECT_NAME
 296 #define ASM_DECLARE_OBJECT_NAME(STREAM, NAME, DECL)     \
 297 do {                                                    \
 298   if (i386_pe_dllexport_name_p (NAME))                  \
 299     i386_pe_record_exported_symbol (NAME, 1);           \
 300   ASM_OUTPUT_LABEL ((STREAM), (NAME));                  \
 301 } while (0)
 302
 303 \f
 304 /* Emit code to check the stack when allocating more that 4000
 305    bytes in one go.  */
 306
 307 #define CHECK_STACK_LIMIT 4000
 308
 309 /* By default, target has a 80387, uses IEEE compatible arithmetic,
 310    returns float values in the 387 and needs stack probes.
 311    We also align doubles to 64-bits for MSVC default compatibility. */
 312
 313 #undef TARGET_SUBTARGET_DEFAULT
 314 #define TARGET_SUBTARGET_DEFAULT \
 315    (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_STACK_PROBE \
 316     | MASK_ALIGN_DOUBLE)
 317
 318 /* This is how to output an assembler line
 319    that says to advance the location counter
 320    to a multiple of 2**LOG bytes.  */
 321
 322 #undef ASM_OUTPUT_ALIGN
 323 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
 324     if ((LOG)!=0) fprintf ((FILE), "\t.align %d\n", 1<<(LOG))
 325
 326 /* Define this macro if in some cases global symbols from one translation
 327    unit may not be bound to undefined symbols in another translation unit
 328    without user intervention.  For instance, under Microsoft Windows
 329    symbols must be explicitly imported from shared libraries (DLLs).  */
 330 #define MULTIPLE_SYMBOL_SPACES
 331
 332 extern void i386_pe_unique_section PARAMS ((TREE, int));
 333 #define TARGET_ASM_UNIQUE_SECTION i386_pe_unique_section
 334
 335 #define SUPPORTS_ONE_ONLY 1
 336
 337 /* Switch into a generic section.  */
 338 #define TARGET_ASM_NAMED_SECTION  i386_pe_asm_named_section
 339
 340 /* Select attributes for named sections.  */
 341 #define TARGET_SECTION_TYPE_FLAGS  i386_pe_section_type_flags
 342
 343 /* Write the extra assembler code needed to declare a function
 344    properly.  If we are generating SDB debugging information, this
 345    will happen automatically, so we only need to handle other cases.  */
 346 #undef ASM_DECLARE_FUNCTION_NAME
 347 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)                     \
 348   do                                                                    \
 349     {                                                                   \
 350       if (i386_pe_dllexport_name_p (NAME))                              \
 351         i386_pe_record_exported_symbol (NAME, 0);                       \
 352       if (write_symbols != SDB_DEBUG)                                   \
 353         i386_pe_declare_function_type (FILE, NAME, TREE_PUBLIC (DECL)); \
 354       ASM_OUTPUT_LABEL (FILE, NAME);                                    \
 355     }                                                                   \
 356   while (0)
 357
 358 /* Add an external function to the list of functions to be declared at
 359    the end of the file.  */
 360 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME)                           \
 361   do                                                                    \
 362     {                                                                   \
 363       if (TREE_CODE (DECL) == FUNCTION_DECL)                            \
 364         i386_pe_record_external_function (NAME);                        \
 365     }                                                                   \
 366   while (0)
 367
 368 /* Declare the type properly for any external libcall.  */
 369 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
 370   i386_pe_declare_function_type (FILE, XSTR (FUN, 0), 1)
 371
 372 /* This says out to put a global symbol in the BSS section.  */
 373 #undef ASM_OUTPUT_ALIGNED_BSS
 374 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 375   asm_output_aligned_bss ((FILE), (DECL), (NAME), (SIZE), (ALIGN))
 376
 377 /* Output function declarations at the end of the file.  */
 378 #undef ASM_FILE_END
 379 #define ASM_FILE_END(FILE) \
 380   i386_pe_asm_file_end (FILE)
 381
 382 #undef ASM_COMMENT_START
 383 #define ASM_COMMENT_START " #"
 384
 385 /* DWARF2 Unwinding doesn't work with exception handling yet.  To make
 386    it work, we need to build a libgcc_s.dll, and dcrt0.o should be
 387    changed to call __register_frame_info/__deregister_frame_info.  */
 388 #define DWARF2_UNWIND_INFO 0
 389
 390 /* Don't assume anything about the header files.  */
 391 #define NO_IMPLICIT_EXTERN_C
 392
 393 #undef PROFILE_HOOK
 394 #define PROFILE_HOOK(LABEL)                                             \
 395   if (MAIN_NAME_P (DECL_NAME (current_function_decl)))                  \
 396     {                                                                   \
 397       emit_call_insn (gen_rtx (CALL, VOIDmode,                          \
 398         gen_rtx_MEM (FUNCTION_MODE,                                     \
 399                      gen_rtx_SYMBOL_REF (Pmode, "_monstartup")),        \
 400         const0_rtx));                                                   \
 401     }
 402
 403 /* Java Native Interface (JNI) methods on Win32 are invoked using the
 404    stdcall calling convention.  */
 405 #undef MODIFY_JNI_METHOD_CALL
 406 #define MODIFY_JNI_METHOD_CALL(MDECL)                                         \
 407   build_type_attribute_variant ((MDECL),                                      \
 408                                build_tree_list (get_identifier ("stdcall"),   \
 409                                                 NULL))
 410
 411
 412 /* External function declarations.  */
 413
 414 extern void i386_pe_record_external_function PARAMS ((const char *));
 415 extern void i386_pe_declare_function_type PARAMS ((FILE *, const char *, int));
 416 extern void i386_pe_record_exported_symbol PARAMS ((const char *, int));
 417 extern void i386_pe_asm_file_end PARAMS ((FILE *));
 418 extern int i386_pe_dllexport_name_p PARAMS ((const char *));
 419 extern int i386_pe_dllimport_name_p PARAMS ((const char *));
 420
 421 /* For Win32 ABI compatibility */
 422 #undef DEFAULT_PCC_STRUCT_RETURN
 423 #define DEFAULT_PCC_STRUCT_RETURN 0
 424
 425 /* MSVC returns aggregate types of up to 8 bytes via registers.
 426    See i386.c:ix86_return_in_memory.  */
 427 #undef MS_AGGREGATE_RETURN
 428 #define MS_AGGREGATE_RETURN 1
 429
 430 /* No data type wants to be aligned rounder than this.  */
 431 #undef  BIGGEST_ALIGNMENT
 432 #define BIGGEST_ALIGNMENT 128
 433
 434 /* Native complier aligns internal doubles in structures on dword boundaries.  */
 435 #undef  BIGGEST_FIELD_ALIGNMENT
 436 #define BIGGEST_FIELD_ALIGNMENT 64
 437
 438 /* A bit-field declared as `int' forces `int' alignment for the struct.  */
 439 #undef PCC_BITFIELD_TYPE_MATTERS
 440 #define PCC_BITFIELD_TYPE_MATTERS 1
 441 #define GROUP_BITFIELDS_BY_ALIGN TYPE_NATIVE(rec)
 442
 443
 444 /* Enable alias attribute support.  */
 445 #ifndef SET_ASM_OP
 446 #define SET_ASM_OP "\t.set\t"
 447 #endif
 448
 449 /* Override GCC's relative pathname lookup (ie., relocatability) unless
 450    otherwise told by other subtargets.  */
 451 #ifndef WIN32_NO_ABSOLUTE_INST_DIRS
 452 #undef MD_STARTFILE_PREFIX
 453 #define MD_STARTFILE_PREFIX     "/usr/lib/"
 454
 455 #undef STANDARD_STARTFILE_PREFIX
 456 #define STANDARD_STARTFILE_PREFIX     "/usr/lib/mingw/"
 457
 458 #ifndef CROSS_COMPILE
 459 #undef LOCAL_INCLUDE_DIR
 460 #undef TOOL_INCLUDE_DIR
 461 #undef SYSTEM_INCLUDE_DIR
 462 #undef STANDARD_INCLUDE_DIR
 463 #define STANDARD_INCLUDE_DIR 0
 464 #endif /* not CROSS_COMPILE */
 465 #endif /* not WIN32_NO_ABSOLUTE_INST_DIRS */
 466
 467 #undef TREE
 468
 469 #ifndef BUFSIZ
 470 # undef FILE
 471 #endif