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
   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
  24 #define SDB_DEBUGGING_INFO
  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 #undef CPP_PREDEFINES
  58 #define CPP_PREDEFINES "-D_X86_=1 -Asystem=winnt"
  59
  60 #ifdef CROSS_COMPILE
  61 #define CYGWIN_INCLUDES "%{!nostdinc:-idirafter " CYGWIN_CROSS_DIR "/include}"
  62 #define W32API_INC "%{!nostdinc:-idirafter " CYGWIN_CROSS_DIR "/include/w32api}"
  63 #define W32API_LIB "-L" CYGWIN_CROSS_DIR "/lib/w32api/"
  64 #define CYGWIN_LIB CYGWIN_CROSS_DIR "/lib"
  65 #define MINGW_LIBS "-L" CYGWIN_CROSS_DIR "/lib/mingw"
  66 #define MINGW_INCLUDES "%{!nostdinc:-isystem " CYGWIN_CROSS_DIR "/include/mingw/g++-3 "\
  67                        "-isystem " CYGWIN_CROSS_DIR "/include/mingw/g++ "\
  68                        "-idirafter " CYGWIN_CROSS_DIR "/include/mingw}"
  69 #else
  70 #define CYGWIN_INCLUDES "%{!nostdinc:-isystem /usr/local/include "\
  71                            "-idirafter " CYGWIN_CROSS_DIR "/include "\
  72                            "-idirafter /usr/include}"
  73 #define W32API_INC "%{!nostdinc:"\
  74                       "-idirafter " CYGWIN_CROSS_DIR "/include/w32api "\
  75                       "-idirafter /usr/include/w32api}"
  76 #define W32API_LIB "-L" CYGWIN_CROSS_DIR "/lib/w32api/ -L/usr/lib/w32api/"
  77 #define CYGWIN_LIB "/usr/lib"
  78 #define MINGW_LIBS "-L/usr/local/lib/mingw -L/usr/lib/mingw"
  79 #define MINGW_INCLUDES "%{!nostdinc:-isystem /usr/include/mingw/g++-3 "\
  80                        "-isystem /usr/include/mingw/g++ "\
  81                        "-isystem /usr/local/include/mingw "\
  82                        "-idirafter " CYGWIN_CROSS_DIR "/include/mingw "\
  83                        "-idirafter /usr/include/mingw}"
  84 #endif
  85
  86 /* Get tree.c to declare a target-specific specialization of
  87    merge_decl_attributes.  */
  88 #define TARGET_DLLIMPORT_DECL_ATTRIBUTES
  89
  90 /* Support the __declspec keyword by turning them into attributes.
  91    We currently only support: dllimport and dllexport.
  92    Note that the current way we do this may result in a collision with
  93    predefined attributes later on.  This can be solved by using one attribute,
  94    say __declspec__, and passing args to it.  The problem with that approach
  95    is that args are not accumulated: each new appearance would clobber any
  96    existing args.  */
  97
  98 #undef CPP_SPEC
  99 #define CPP_SPEC "%(cpp_cpu) %{posix:-D_POSIX_SOURCE} \
 100   -D__stdcall=__attribute__((__stdcall__)) \
 101   -D__cdecl=__attribute__((__cdecl__)) \
 102   %{!ansi:-D_stdcall=__attribute__((__stdcall__)) \
 103     -D_cdecl=__attribute__((__cdecl__))} \
 104   -D__declspec(x)=__attribute__((x)) \
 105   -D__i386__ -D__i386 \
 106   %{mno-win32:%{mno-cygwin: %emno-cygwin and mno-win32 are not compatible}} \
 107   %{mno-cygwin:-D__MSVCRT__ -D__MINGW32__ %{mthreads:-D_MT} "\
 108     MINGW_INCLUDES "} \
 109   %{!mno-cygwin:-D__CYGWIN32__ -D__CYGWIN__ %{!ansi:-Dunix} -D__unix__ -D__unix "\
 110     CYGWIN_INCLUDES "}\
 111   %{mwin32|mno-cygwin:-DWIN32 -D_WIN32 -D__WIN32 -D__WIN32__ %{!ansi:-DWINNT}}\
 112   %{!mno-win32:" W32API_INC "}\
 113 "
 114
 115 #undef STARTFILE_SPEC
 116 #define STARTFILE_SPEC "\
 117   %{shared|mdll: %{mno-cygwin:" MINGW_LIBS " dllcrt2%O%s}}\
 118   %{!shared: %{!mdll: %{!mno-cygwin:crt0%O%s} %{mno-cygwin:" MINGW_LIBS " crt2%O%s}\
 119   %{pg:gcrt0%O%s}}}\
 120 "
 121
 122 /* Normally, -lgcc is not needed since everything in it is in the DLL, but we
 123    want to allow things to be added to it when installing new versions of
 124    GCC without making a new CYGWIN.DLL, so we leave it.  Profiling is handled
 125    by calling the init function from the prologue.  */
 126
 127 #undef LIBGCC_SPEC
 128 #define LIBGCC_SPEC "%{mno-cygwin: %{mthreads:-lmingwthrd} -lmingw32} -lgcc %{mno-cygwin:-lmoldname -lmsvcrt}"
 129
 130 /* This macro defines names of additional specifications to put in the specs
 131    that can be used in various specifications like CC1_SPEC.  Its definition
 132    is an initializer with a subgrouping for each command option.
 133
 134    Each subgrouping contains a string constant, that defines the
 135    specification name, and a string constant that used by the GNU CC driver
 136    program.
 137
 138    Do not define this macro if it does not need to do anything.  */
 139
 140 #undef  SUBTARGET_EXTRA_SPECS
 141 #define SUBTARGET_EXTRA_SPECS                                           \
 142   { "mingw_include_path", DEFAULT_TARGET_MACHINE }
 143
 144 /* We have to dynamic link to get to the system DLLs.  All of libc, libm and
 145    the Unix stuff is in cygwin.dll.  The import library is called
 146    'libcygwin.a'.  For Windows applications, include more libraries, but
 147    always include kernel32.  We'd like to specific subsystem windows to
 148    ld, but that doesn't work just yet.  */
 149
 150 #undef LIB_SPEC
 151 #define LIB_SPEC "\
 152   %{pg:-lgmon} \
 153   %{!mno-cygwin:-lcygwin} \
 154   %{mno-cygwin:%{mthreads:-lmingwthrd} -lmingw32} \
 155   %{mwindows:-lgdi32 -lcomdlg32} \
 156   -luser32 -lkernel32 -ladvapi32 -lshell32"
 157
 158 #define LINK_SPEC W32API_LIB "\
 159   %{mwindows:--subsystem windows} \
 160   %{mconsole:--subsystem console} \
 161   %{shared: %{mdll: %eshared and mdll are not compatible}} \
 162   %{shared: --shared} %{mdll:--dll} \
 163   %{static:-Bstatic} %{!static:-Bdynamic} \
 164   %{shared|mdll: -e \
 165     %{mno-cygwin:_DllMainCRTStartup@12} \
 166     %{!mno-cygwin:__cygwin_dll_entry@12}}\
 167   --dll-search-prefix=cyg"
 168
 169 #undef MATH_LIBRARY
 170 #define MATH_LIBRARY ""
 171
 172 #define SIZE_TYPE "unsigned int"
 173 #define PTRDIFF_TYPE "int"
 174 #define WCHAR_TYPE_SIZE 16
 175 #define WCHAR_TYPE "short unsigned int"
 176
 177 \f
 178 /* Enable parsing of #pragma pack(push,<n>) and #pragma pack(pop).  */
 179 #define HANDLE_PRAGMA_PACK_PUSH_POP 1
 180
 181 union tree_node;
 182 #define TREE union tree_node *
 183 \f
 184 #undef EXTRA_SECTIONS
 185 #define EXTRA_SECTIONS in_drectve
 186
 187 #undef EXTRA_SECTION_FUNCTIONS
 188 #define EXTRA_SECTION_FUNCTIONS                                 \
 189   DRECTVE_SECTION_FUNCTION                                      \
 190   SWITCH_TO_SECTION_FUNCTION
 191
 192 #define DRECTVE_SECTION_FUNCTION \
 193 void                                                                    \
 194 drectve_section ()                                                      \
 195 {                                                                       \
 196   if (in_section != in_drectve)                                         \
 197     {                                                                   \
 198       fprintf (asm_out_file, "%s\n", "\t.section .drectve\n");          \
 199       in_section = in_drectve;                                          \
 200     }                                                                   \
 201 }
 202 void drectve_section PARAMS ((void));
 203
 204 /* Switch to SECTION (an `enum in_section').
 205
 206    ??? This facility should be provided by GCC proper.
 207    The problem is that we want to temporarily switch sections in
 208    ASM_DECLARE_OBJECT_NAME and then switch back to the original section
 209    afterwards.  */
 210 #define SWITCH_TO_SECTION_FUNCTION                              \
 211 void switch_to_section PARAMS ((enum in_section, tree));        \
 212 void                                                            \
 213 switch_to_section (section, decl)                               \
 214      enum in_section section;                                   \
 215      tree decl;                                                 \
 216 {                                                               \
 217   switch (section)                                              \
 218     {                                                           \
 219       case in_text: text_section (); break;                     \
 220       case in_data: data_section (); break;                     \
 221       case in_named: named_section (decl, NULL, 0); break;      \
 222       case in_drectve: drectve_section (); break;               \
 223       default: abort (); break;                                 \
 224     }                                                           \
 225 }
 226
 227 /* Don't allow flag_pic to propagate since gas may produce invalid code
 228    otherwise.  */
 229
 230 #undef  SUBTARGET_OVERRIDE_OPTIONS
 231 #define SUBTARGET_OVERRIDE_OPTIONS                                      \
 232 do {                                                                    \
 233   if (flag_pic)                                                         \
 234     {                                                                   \
 235       warning ("-f%s ignored for target (all code is position independent)",\
 236                (flag_pic > 1) ? "PIC" : "pic");                         \
 237       flag_pic = 0;                                                     \
 238     }                                                                   \
 239 } while (0)                                                             \
 240
 241 /* Define this macro if references to a symbol must be treated
 242    differently depending on something about the variable or
 243    function named by the symbol (such as what section it is in).
 244
 245    On i386 running Windows NT, modify the assembler name with a suffix
 246    consisting of an atsign (@) followed by string of digits that represents
 247    the number of bytes of arguments passed to the function, if it has the
 248    attribute STDCALL.
 249
 250    In addition, we must mark dll symbols specially. Definitions of
 251    dllexport'd objects install some info in the .drectve section.
 252    References to dllimport'd objects are fetched indirectly via
 253    _imp__.  If both are declared, dllexport overrides.  This is also
 254    needed to implement one-only vtables: they go into their own
 255    section and we need to set DECL_SECTION_NAME so we do that here.
 256    Note that we can be called twice on the same decl.  */
 257
 258 #undef TARGET_ENCODE_SECTION_INFO
 259 #define TARGET_ENCODE_SECTION_INFO  i386_pe_encode_section_info
 260 #undef  TARGET_STRIP_NAME_ENCODING
 261 #define TARGET_STRIP_NAME_ENCODING  i386_pe_strip_name_encoding_full
 262 \f
 263 /* Output a reference to a label.  */
 264 #undef ASM_OUTPUT_LABELREF
 265 #define ASM_OUTPUT_LABELREF(STREAM, NAME)               \
 266   fprintf (STREAM, "%s%s", USER_LABEL_PREFIX,           \
 267            i386_pe_strip_name_encoding (NAME))          \
 268
 269 /* Output a common block.  */
 270 #undef ASM_OUTPUT_COMMON
 271 #define ASM_OUTPUT_COMMON(STREAM, NAME, SIZE, ROUNDED)  \
 272 do {                                                    \
 273   if (i386_pe_dllexport_name_p (NAME))                  \
 274     i386_pe_record_exported_symbol (NAME, 1);           \
 275   if (! i386_pe_dllimport_name_p (NAME))                \
 276     {                                                   \
 277       fprintf ((STREAM), "\t.comm\t");                  \
 278       assemble_name ((STREAM), (NAME));                 \
 279       fprintf ((STREAM), ", %d\t%s %d\n",               \
 280                (ROUNDED), ASM_COMMENT_START, (SIZE));   \
 281     }                                                   \
 282 } while (0)
 283
 284 /* Output the label for an initialized variable.  */
 285 #undef ASM_DECLARE_OBJECT_NAME
 286 #define ASM_DECLARE_OBJECT_NAME(STREAM, NAME, DECL)     \
 287 do {                                                    \
 288   if (i386_pe_dllexport_name_p (NAME))                  \
 289     i386_pe_record_exported_symbol (NAME, 1);           \
 290   ASM_OUTPUT_LABEL ((STREAM), (NAME));                  \
 291 } while (0)
 292
 293 \f
 294 /* Emit code to check the stack when allocating more that 4000
 295    bytes in one go.  */
 296
 297 #define CHECK_STACK_LIMIT 4000
 298
 299 /* By default, target has a 80387, uses IEEE compatible arithmetic,
 300    and returns float values in the 387 and needs stack probes */
 301 #undef TARGET_SUBTARGET_DEFAULT
 302
 303 #define TARGET_SUBTARGET_DEFAULT \
 304    (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_STACK_PROBE)
 305
 306 /* This is how to output an assembler line
 307    that says to advance the location counter
 308    to a multiple of 2**LOG bytes.  */
 309
 310 #undef ASM_OUTPUT_ALIGN
 311 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
 312     if ((LOG)!=0) fprintf ((FILE), "\t.align %d\n", 1<<(LOG))
 313
 314 /* Define this macro if in some cases global symbols from one translation
 315    unit may not be bound to undefined symbols in another translation unit
 316    without user intervention.  For instance, under Microsoft Windows
 317    symbols must be explicitly imported from shared libraries (DLLs).  */
 318 #define MULTIPLE_SYMBOL_SPACES
 319
 320 extern void i386_pe_unique_section PARAMS ((TREE, int));
 321 #define TARGET_ASM_UNIQUE_SECTION i386_pe_unique_section
 322
 323 #define SUPPORTS_ONE_ONLY 1
 324
 325 /* Switch into a generic section.  */
 326 #define TARGET_ASM_NAMED_SECTION  i386_pe_asm_named_section
 327
 328 /* Select attributes for named sections.  */
 329 #define TARGET_SECTION_TYPE_FLAGS  i386_pe_section_type_flags
 330
 331 /* Write the extra assembler code needed to declare a function
 332    properly.  If we are generating SDB debugging information, this
 333    will happen automatically, so we only need to handle other cases.  */
 334 #undef ASM_DECLARE_FUNCTION_NAME
 335 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)                     \
 336   do                                                                    \
 337     {                                                                   \
 338       if (i386_pe_dllexport_name_p (NAME))                              \
 339         i386_pe_record_exported_symbol (NAME, 0);                       \
 340       if (write_symbols != SDB_DEBUG)                                   \
 341         i386_pe_declare_function_type (FILE, NAME, TREE_PUBLIC (DECL)); \
 342       ASM_OUTPUT_LABEL (FILE, NAME);                                    \
 343     }                                                                   \
 344   while (0)
 345
 346 /* Add an external function to the list of functions to be declared at
 347    the end of the file.  */
 348 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME)                           \
 349   do                                                                    \
 350     {                                                                   \
 351       if (TREE_CODE (DECL) == FUNCTION_DECL)                            \
 352         i386_pe_record_external_function (NAME);                        \
 353     }                                                                   \
 354   while (0)
 355
 356 /* Declare the type properly for any external libcall.  */
 357 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
 358   i386_pe_declare_function_type (FILE, XSTR (FUN, 0), 1)
 359
 360 /* This says out to put a global symbol in the BSS section.  */
 361 #undef ASM_OUTPUT_ALIGNED_BSS
 362 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 363   asm_output_aligned_bss ((FILE), (DECL), (NAME), (SIZE), (ALIGN))
 364
 365 /* Output function declarations at the end of the file.  */
 366 #undef ASM_FILE_END
 367 #define ASM_FILE_END(FILE) \
 368   i386_pe_asm_file_end (FILE)
 369
 370 #undef ASM_COMMENT_START
 371 #define ASM_COMMENT_START " #"
 372
 373 /* DWARF2 Unwinding doesn't work with exception handling yet.  To make
 374    it work, we need to build a libgcc_s.dll, and dcrt0.o should be
 375    changed to call __register_frame_info/__deregister_frame_info.  */
 376 #define DWARF2_UNWIND_INFO 0
 377
 378 /* Don't assume anything about the header files.  */
 379 #define NO_IMPLICIT_EXTERN_C
 380
 381 #define SUBTARGET_PROLOGUE                                              \
 382   if (current_function_profile                                          \
 383       && MAIN_NAME_P (DECL_NAME (current_function_decl)))               \
 384      {                                                                  \
 385       emit_call_insn (gen_rtx (CALL, VOIDmode,                          \
 386         gen_rtx_MEM (FUNCTION_MODE,                                     \
 387                      gen_rtx_SYMBOL_REF (Pmode, "_monstartup")),        \
 388         const0_rtx));                                                   \
 389      }
 390
 391 /* External function declarations.  */
 392
 393 extern void i386_pe_record_external_function PARAMS ((const char *));
 394 extern void i386_pe_declare_function_type PARAMS ((FILE *, const char *, int));
 395 extern void i386_pe_record_exported_symbol PARAMS ((const char *, int));
 396 extern void i386_pe_asm_file_end PARAMS ((FILE *));
 397 extern int i386_pe_dllexport_name_p PARAMS ((const char *));
 398 extern int i386_pe_dllimport_name_p PARAMS ((const char *));
 399
 400 /* For Win32 ABI compatibility */
 401 #undef DEFAULT_PCC_STRUCT_RETURN
 402 #define DEFAULT_PCC_STRUCT_RETURN 0
 403
 404 /* No data type wants to be aligned rounder than this.  */
 405 #undef  BIGGEST_ALIGNMENT
 406 #define BIGGEST_ALIGNMENT 128
 407
 408 /* Native complier aligns internal doubles in structures on dword boundaries.  */
 409 #undef  BIGGEST_FIELD_ALIGNMENT
 410 #define BIGGEST_FIELD_ALIGNMENT 64
 411
 412 /* A bitfield declared as `int' forces `int' alignment for the struct.  */
 413 #undef PCC_BITFIELD_TYPE_MATTERS
 414 #define PCC_BITFIELD_TYPE_MATTERS 1
 415 #define GROUP_BITFIELDS_BY_ALIGN TYPE_NATIVE(rec)
 416
 417
 418 /* Enable alias attribute support.  */
 419 #ifndef SET_ASM_OP
 420 #define SET_ASM_OP "\t.set\t"
 421 #endif
 422
 423 /* Override GCC's relative pathname lookup (ie., relocatability) unless
 424    otherwise told by other subtargets.  */
 425 #ifndef WIN32_NO_ABSOLUTE_INST_DIRS
 426 #undef MD_STARTFILE_PREFIX
 427 #define MD_STARTFILE_PREFIX     "/usr/lib/"
 428
 429 #undef STANDARD_STARTFILE_PREFIX
 430 #define STANDARD_STARTFILE_PREFIX     "/usr/lib/mingw/"
 431
 432 #ifndef CROSS_COMPILE
 433 #undef LOCAL_INCLUDE_DIR
 434 #undef TOOL_INCLUDE_DIR
 435 #undef SYSTEM_INCLUDE_DIR
 436 #undef STANDARD_INCLUDE_DIR
 437 #define STANDARD_INCLUDE_DIR 0
 438 #endif /* not CROSS_COMPILE */
 439 #endif /* not WIN32_NO_ABSOLUTE_INST_DIRS */
 440
 441 #undef TREE
 442
 443 #ifndef BUFSIZ
 444 # undef FILE
 445 #endif