gcc/config/i386/djgpp.h

   1 /* Configuration for an i386 running MS-DOS with DJGPP.
   2    Copyright (C) 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
   3
   4 This file is part of GNU CC.
   5
   6 GNU CC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU CC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU CC; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 #include "dbxcoff.h"
  22
  23 /* Support generation of DWARF2 debugging info.  */
  24 #define DWARF2_DEBUGGING_INFO
  25
  26 /* Don't assume anything about the header files. */
  27 #define NO_IMPLICIT_EXTERN_C
  28
  29 #define HANDLE_SYSV_PRAGMA
  30
  31 /* Enable parsing of #pragma pack(push,<n>) and #pragma pack(pop).  */
  32 #define HANDLE_PRAGMA_PACK_PUSH_POP 1
  33
  34 #define YES_UNDERSCORES
  35
  36 #include "i386/gas.h"
  37
  38 /* If defined, a C expression whose value is a string containing the
  39    assembler operation to identify the following data as
  40    uninitialized global data.  If not defined, and neither
  41    `ASM_OUTPUT_BSS' nor `ASM_OUTPUT_ALIGNED_BSS' are defined,
  42    uninitialized global data will be output in the data section if
  43    `-fno-common' is passed, otherwise `ASM_OUTPUT_COMMON' will be
  44    used.  */
  45 #undef BSS_SECTION_ASM_OP
  46 #define BSS_SECTION_ASM_OP "\t.section\t.bss"
  47
  48 /* Define the name of the .ctor section.  */
  49 #undef CTORS_SECTION_ASM_OP
  50 #define CTORS_SECTION_ASM_OP "\t.section .ctor"
  51
  52 /* Define the name of the .data section.  */
  53 #undef DATA_SECTION_ASM_OP
  54 #define DATA_SECTION_ASM_OP "\t.section .data"
  55
  56 /* Define the name of the .dtor section.  */
  57 #undef DTORS_SECTION_ASM_OP
  58 #define DTORS_SECTION_ASM_OP "\t.section .dtor"
  59
  60 /* Define the name of the .ident op.  */
  61 #undef IDENT_ASM_OP
  62 #define IDENT_ASM_OP "\t.ident\t"
  63
  64 /* Define the name of the .int op.  */
  65 #undef INT_ASM_OP
  66 #define INT_ASM_OP "\t.long\t"
  67
  68 /* Enable alias attribute support.  */
  69 #ifndef SET_ASM_OP
  70 #define SET_ASM_OP "\t.set\t"
  71 #endif
  72
  73 /* Define the name of the .text section.  */
  74 #undef TEXT_SECTION_ASM_OP
  75 #define TEXT_SECTION_ASM_OP "\t.section .text"
  76
  77 /* How to output an unaligned integer.  */
  78 #undef UNALIGNED_INT_ASM_OP
  79 #define UNALIGNED_INT_ASM_OP "\t.long\t"
  80
  81 /* How to output an unaligned double length integer.  */
  82 #undef UNALIGNED_DOUBLE_INT_ASM_OP
  83 #define UNALIGNED_DOUBLE_INT_ASM_OP "\t.quad\t"
  84
  85 /* How to output an unaligned half length intenger.  */
  86 #undef UNALIGNED_SHORT_ASM_OP
  87 #define UNALIGNED_SHORT_ASM_OP "\t.short\t"
  88
  89 /* Define standard DJGPP installation paths.                             */
  90 /* We override default /usr or /usr/local part with /dev/env/DJDIR which */
  91 /* points to actual DJGPP instalation directory.                         */
  92
  93 /* Standard include directory */
  94 #undef STANDARD_INCLUDE_DIR
  95 #define STANDARD_INCLUDE_DIR "/dev/env/DJDIR/include/"
  96
  97 /* Search for as.exe and ld.exe in DJGPP's binary directory. */
  98 #undef MD_EXEC_PREFIX
  99 #define MD_EXEC_PREFIX "/dev/env/DJDIR/bin/"
 100
 101 /* Standard DJGPP library and startup files */
 102 #undef MD_STARTFILE_PREFIX
 103 #define MD_STARTFILE_PREFIX "/dev/env/DJDIR/lib/"
 104
 105 /* Correctly handle absolute filename detection in cp/xref.c */
 106 #define FILE_NAME_ABSOLUTE_P(NAME) \
 107         (((NAME)[0] == '/') || ((NAME)[0] == '\\') || \
 108         (((NAME)[0] >= 'A') && ((NAME)[0] <= 'z') && ((NAME)[1] == ':')))
 109
 110 #undef CPP_PREDEFINES
 111 #define CPP_PREDEFINES "-D__MSDOS__ -D__GO32__ -Asystem=msdos"
 112
 113 /* Include <sys/version.h> so __DJGPP__ and __DJGPP_MINOR__ are defined.  */
 114 #undef CPP_SPEC
 115 #define CPP_SPEC "-remap %(cpp_cpu) %{posix:-D_POSIX_SOURCE} \
 116   %{!ansi:%{!std=c*:%{!std=i*:-DMSDOS}}} %{!ansi:%{!std=c*:%{!std=i*:-DGO32}}} \
 117   -imacros %s../include/sys/version.h"
 118
 119 /* We need to override link_command_spec in gcc.c so support -Tdjgpp.djl.
 120    This cannot be done in LINK_SPECS as that LINK_SPECS is processed
 121    before library search directories are known by the linker.
 122    This avoids problems when specs file is not available. An alternate way,
 123    suggested by Robert Hoehne, is to use SUBTARGET_EXTRA_SPECS instead.
 124 */
 125
 126 #undef LINK_COMMAND_SPEC
 127 #define LINK_COMMAND_SPEC \
 128 "%{!fsyntax-only: \
 129 %{!c:%{!M:%{!MM:%{!E:%{!S:%(linker) %l %X %{o*} %{A} %{d} %{e*} %{m} %{N} %{n} \
 130 \t%{r} %{s} %{t} %{u*} %{x} %{z} %{Z}\
 131 \t%{!A:%{!nostdlib:%{!nostartfiles:%S}}}\
 132 \t%{static:} %{L*} %D %o\
 133 \t%{!nostdlib:%{!nodefaultlibs:%G %L %G}}\
 134 \t%{!A:%{!nostdlib:%{!nostartfiles:%E}}}\
 135 \t-Tdjgpp.djl %{T*}}}}}}}\n\
 136 %{!c:%{!M:%{!MM:%{!E:%{!S:stubify %{v} %{o*:%*} %{!o*:a.out} }}}}}"
 137
 138 /* Always just link in 'libc.a'.  */
 139 #undef LIB_SPEC
 140 #define LIB_SPEC "-lc"
 141
 142 /* Pick the right startup code depending on the -pg flag.  */
 143 #undef STARTFILE_SPEC
 144 #define STARTFILE_SPEC "%{pg:gcrt0.o%s}%{!pg:crt0.o%s}"
 145
 146 /* Make sure that gcc will not look for .h files in /usr/local/include
 147    unless user explicitly requests it.  */
 148 #undef LOCAL_INCLUDE_DIR
 149
 150 #undef EXTRA_SECTIONS
 151 #define EXTRA_SECTIONS in_ctor, in_dtor
 152
 153 #undef EXTRA_SECTION_FUNCTIONS
 154 #define EXTRA_SECTION_FUNCTIONS                                 \
 155   CTOR_SECTION_FUNCTION                                         \
 156   DTOR_SECTION_FUNCTION
 157
 158 #define CTOR_SECTION_FUNCTION                                   \
 159 void                                                            \
 160 ctor_section ()                                                 \
 161 {                                                               \
 162   if (in_section != in_ctor)                                    \
 163     {                                                           \
 164       fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP);     \
 165       in_section = in_ctor;                                     \
 166     }                                                           \
 167 }
 168
 169 #define DTOR_SECTION_FUNCTION                                   \
 170 void                                                            \
 171 dtor_section ()                                                 \
 172 {                                                               \
 173   if (in_section != in_dtor)                                    \
 174     {                                                           \
 175       fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP);     \
 176       in_section = in_dtor;                                     \
 177     }                                                           \
 178 }
 179
 180 #define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME)       \
 181   do {                                          \
 182     ctor_section ();                            \
 183     fputs (ASM_LONG, FILE);                     \
 184     assemble_name (FILE, NAME);                 \
 185     fprintf (FILE, "\n");                       \
 186   } while (0)
 187
 188 /* Switch into a generic section.  */
 189 #define TARGET_ASM_NAMED_SECTION  default_coff_asm_named_section
 190
 191 #define ASM_OUTPUT_DESTRUCTOR(FILE,NAME)        \
 192   do {                                          \
 193     dtor_section ();                            \
 194     fputs (ASM_LONG, FILE);                     \
 195     assemble_name (FILE, NAME);                 \
 196     fprintf (FILE, "\n");                       \
 197   } while (0)
 198
 199 /* Output at beginning of assembler file.  */
 200 /* The .file command should always begin the output.  */
 201
 202 #undef ASM_FILE_START
 203 #define ASM_FILE_START(FILE)                                            \
 204   do {                                                                  \
 205         output_file_directive (FILE, main_input_filename);              \
 206   } while (0)
 207
 208 /* This is how to output an assembler line
 209    that says to advance the location counter
 210    to a multiple of 2**LOG bytes.  */
 211
 212 #undef ASM_OUTPUT_ALIGN
 213 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
 214   if ((LOG) != 0) fprintf ((FILE), "\t.p2align %d\n", LOG)
 215
 216 /* This is how to output a global symbol in the BSS section.  */
 217 #undef ASM_OUTPUT_ALIGNED_BSS
 218 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 219   asm_output_aligned_bss ((FILE), (DECL), (NAME), (SIZE), (ALIGN))
 220
 221 /* This is how to tell assembler that a symbol is weak  */
 222 #undef ASM_WEAKEN_LABEL
 223 #define ASM_WEAKEN_LABEL(FILE,NAME) \
 224   do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
 225        fputc ('\n', FILE); } while (0)
 226
 227 /* djgpp automatically calls its own version of __main, so don't define one
 228    in libgcc, nor call one in main().  */
 229 #define HAS_INIT_SECTION
 230
 231 /* Definitions for types and sizes. Wide characters are 16-bits long so
 232    Win32 compiler add-ons will be wide character compatible.  */
 233 #undef WCHAR_UNSIGNED
 234 #define WCHAR_UNSIGNED 1
 235
 236 #undef WCHAR_TYPE_SIZE
 237 #define WCHAR_TYPE_SIZE 16
 238
 239 #undef WCHAR_TYPE
 240 #define WCHAR_TYPE "short unsigned int"
 241
 242 #undef WINT_TYPE
 243 #define WINT_TYPE "int"
 244
 245 #undef SIZE_TYPE
 246 #define SIZE_TYPE "long unsigned int"
 247
 248 #undef PTRDIFF_TYPE
 249 #define PTRDIFF_TYPE "int"
 250
 251 /* Used to be defined in xm-djgpp.h, but moved here for cross-compilers.  */
 252 #define LIBSTDCXX "-lstdcxx"
 253
 254 /* -mbnu210 is now ignored and obsolete. It was used to enable support for
 255    weak symbols, and .gnu.linkonce support.  */
 256 #undef MASK_BNU210
 257 #define MASK_BNU210 (0x40000000)
 258
 259 #undef SUBTARGET_SWITCHES
 260 #define SUBTARGET_SWITCHES \
 261   { "no-bnu210", -MASK_BNU210, "Ignored (obsolete)." }, \
 262   { "bnu210", MASK_BNU210, "Ignored (obsolete)." },
 263
 264 /* Warn that -mbnu210 is now obsolete.  */
 265 #undef  SUBTARGET_OVERRIDE_OPTIONS
 266 #define SUBTARGET_OVERRIDE_OPTIONS \
 267 do \
 268   { \
 269     if (target_flags & MASK_BNU210) \
 270       { \
 271         warning ("-mbnu210 is ignored (option is obsolete)."); \
 272       } \
 273   } \
 274 while (0)
 275
 276 /* Support for C++ templates.  */
 277 #undef MAKE_DECL_ONE_ONLY
 278 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
 279
 280 #undef UNIQUE_SECTION
 281 #define UNIQUE_SECTION(DECL,RELOC)                              \
 282 do {                                                            \
 283   int len;                                                      \
 284   const char *name, *prefix;                                    \
 285   char *string;                                                 \
 286                                                                 \
 287   name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL));       \
 288                                                                 \
 289   if (! DECL_ONE_ONLY (DECL))                                   \
 290     {                                                           \
 291       if (TREE_CODE (DECL) == FUNCTION_DECL)                    \
 292         prefix = ".text.";                                      \
 293       else if (DECL_READONLY_SECTION (DECL, RELOC))             \
 294         prefix = ".rodata.";                                    \
 295       else                                                      \
 296         prefix = ".data.";                                      \
 297     }                                                           \
 298   else if (TREE_CODE (DECL) == FUNCTION_DECL)                   \
 299     prefix = ".gnu.linkonce.t.";                                \
 300   else if (DECL_READONLY_SECTION (DECL, RELOC))                 \
 301     prefix = ".gnu.linkonce.r.";                                \
 302   else                                                          \
 303     prefix = ".gnu.linkonce.d.";                                \
 304                                                                 \
 305   len = strlen (name) + strlen (prefix);                        \
 306   string = alloca (len + 1);                                    \
 307   sprintf (string, "%s%s", prefix, name);                       \
 308                                                                 \
 309   DECL_SECTION_NAME (DECL) = build_string (len, string);        \
 310 } while (0)