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 .data section.  */
  49 #undef DATA_SECTION_ASM_OP
  50 #define DATA_SECTION_ASM_OP "\t.section .data"
  51
  52 /* Define the name of the .ident op.  */
  53 #undef IDENT_ASM_OP
  54 #define IDENT_ASM_OP "\t.ident\t"
  55
  56 /* Enable alias attribute support.  */
  57 #ifndef SET_ASM_OP
  58 #define SET_ASM_OP "\t.set\t"
  59 #endif
  60
  61 /* Define the name of the .text section.  */
  62 #undef TEXT_SECTION_ASM_OP
  63 #define TEXT_SECTION_ASM_OP "\t.section .text"
  64
  65 /* Define standard DJGPP installation paths.                             */
  66 /* We override default /usr or /usr/local part with /dev/env/DJDIR which */
  67 /* points to actual DJGPP instalation directory.                         */
  68
  69 /* Standard include directory */
  70 #undef STANDARD_INCLUDE_DIR
  71 #define STANDARD_INCLUDE_DIR "/dev/env/DJDIR/include/"
  72
  73 /* Search for as.exe and ld.exe in DJGPP's binary directory.  */
  74 #undef MD_EXEC_PREFIX
  75 #define MD_EXEC_PREFIX "/dev/env/DJDIR/bin/"
  76
  77 /* Standard DJGPP library and startup files */
  78 #undef MD_STARTFILE_PREFIX
  79 #define MD_STARTFILE_PREFIX "/dev/env/DJDIR/lib/"
  80
  81 /* Correctly handle absolute filename detection in cp/xref.c */
  82 #define FILE_NAME_ABSOLUTE_P(NAME) \
  83         (((NAME)[0] == '/') || ((NAME)[0] == '\\') || \
  84         (((NAME)[0] >= 'A') && ((NAME)[0] <= 'z') && ((NAME)[1] == ':')))
  85
  86 #undef CPP_PREDEFINES
  87 #define CPP_PREDEFINES "-D__MSDOS__ -D__GO32__ -Asystem=msdos"
  88
  89 /* Include <sys/version.h> so __DJGPP__ and __DJGPP_MINOR__ are defined.  */
  90 #undef CPP_SPEC
  91 #define CPP_SPEC "-remap %(cpp_cpu) %{posix:-D_POSIX_SOURCE} \
  92   %{!ansi:%{!std=c*:%{!std=i*:-DMSDOS}}} %{!ansi:%{!std=c*:%{!std=i*:-DGO32}}} \
  93   -imacros %s../include/sys/version.h"
  94
  95 /* We need to override link_command_spec in gcc.c so support -Tdjgpp.djl.
  96    This cannot be done in LINK_SPECS as that LINK_SPECS is processed
  97    before library search directories are known by the linker.
  98    This avoids problems when specs file is not available. An alternate way,
  99    suggested by Robert Hoehne, is to use SUBTARGET_EXTRA_SPECS instead.
 100 */
 101
 102 #undef LINK_COMMAND_SPEC
 103 #define LINK_COMMAND_SPEC \
 104 "%{!fsyntax-only: \
 105 %{!c:%{!M:%{!MM:%{!E:%{!S:%(linker) %l %X %{o*} %{A} %{d} %{e*} %{m} %{N} %{n} \
 106 \t%{r} %{s} %{t} %{u*} %{x} %{z} %{Z}\
 107 \t%{!A:%{!nostdlib:%{!nostartfiles:%S}}}\
 108 \t%{static:} %{L*} %D %o\
 109 \t%{!nostdlib:%{!nodefaultlibs:%G %L %G}}\
 110 \t%{!A:%{!nostdlib:%{!nostartfiles:%E}}}\
 111 \t-Tdjgpp.djl %{T*}}}}}}}\n\
 112 %{!c:%{!M:%{!MM:%{!E:%{!S:stubify %{v} %{o*:%*} %{!o*:a.out} }}}}}"
 113
 114 /* Always just link in 'libc.a'.  */
 115 #undef LIB_SPEC
 116 #define LIB_SPEC "-lc"
 117
 118 /* Pick the right startup code depending on the -pg flag.  */
 119 #undef STARTFILE_SPEC
 120 #define STARTFILE_SPEC "%{pg:gcrt0.o%s}%{!pg:crt0.o%s}"
 121
 122 /* Make sure that gcc will not look for .h files in /usr/local/include
 123    unless user explicitly requests it.  */
 124 #undef LOCAL_INCLUDE_DIR
 125
 126 /* Switch into a generic section.  */
 127 #define TARGET_ASM_NAMED_SECTION  default_coff_asm_named_section
 128
 129 /* Output at beginning of assembler file.  */
 130 /* The .file command should always begin the output.  */
 131
 132 #undef ASM_FILE_START
 133 #define ASM_FILE_START(FILE)                                            \
 134   do {                                                                  \
 135         output_file_directive (FILE, main_input_filename);              \
 136   } while (0)
 137
 138 /* This is how to output an assembler line
 139    that says to advance the location counter
 140    to a multiple of 2**LOG bytes.  */
 141
 142 #undef ASM_OUTPUT_ALIGN
 143 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
 144   if ((LOG) != 0) fprintf ((FILE), "\t.p2align %d\n", LOG)
 145
 146 /* This is how to output a global symbol in the BSS section.  */
 147 #undef ASM_OUTPUT_ALIGNED_BSS
 148 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 149   asm_output_aligned_bss ((FILE), (DECL), (NAME), (SIZE), (ALIGN))
 150
 151 /* This is how to tell assembler that a symbol is weak  */
 152 #undef ASM_WEAKEN_LABEL
 153 #define ASM_WEAKEN_LABEL(FILE,NAME) \
 154   do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
 155        fputc ('\n', FILE); } while (0)
 156
 157 /* djgpp automatically calls its own version of __main, so don't define one
 158    in libgcc, nor call one in main().  */
 159 #define HAS_INIT_SECTION
 160
 161 /* Definitions for types and sizes. Wide characters are 16-bits long so
 162    Win32 compiler add-ons will be wide character compatible.  */
 163 #undef WCHAR_UNSIGNED
 164 #define WCHAR_UNSIGNED 1
 165
 166 #undef WCHAR_TYPE_SIZE
 167 #define WCHAR_TYPE_SIZE 16
 168
 169 #undef WCHAR_TYPE
 170 #define WCHAR_TYPE "short unsigned int"
 171
 172 #undef WINT_TYPE
 173 #define WINT_TYPE "int"
 174
 175 #undef SIZE_TYPE
 176 #define SIZE_TYPE "long unsigned int"
 177
 178 #undef PTRDIFF_TYPE
 179 #define PTRDIFF_TYPE "int"
 180
 181 /* Used to be defined in xm-djgpp.h, but moved here for cross-compilers.  */
 182 #define LIBSTDCXX "-lstdcxx"
 183
 184 /* -mbnu210 is now ignored and obsolete. It was used to enable support for
 185    weak symbols, and .gnu.linkonce support.  */
 186 #undef MASK_BNU210
 187 #define MASK_BNU210 (0x40000000)
 188
 189 #undef SUBTARGET_SWITCHES
 190 #define SUBTARGET_SWITCHES \
 191   { "no-bnu210", -MASK_BNU210, "Ignored (obsolete)" }, \
 192   { "bnu210", MASK_BNU210, "Ignored (obsolete)" },
 193
 194 /* Warn that -mbnu210 is now obsolete.  */
 195 #undef  SUBTARGET_OVERRIDE_OPTIONS
 196 #define SUBTARGET_OVERRIDE_OPTIONS \
 197 do \
 198   { \
 199     if (target_flags & MASK_BNU210) \
 200       { \
 201         warning ("-mbnu210 is ignored (option is obsolete)"); \
 202       } \
 203   } \
 204 while (0)
 205
 206 /* Support for C++ templates.  */
 207 #undef MAKE_DECL_ONE_ONLY
 208 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
 209
 210 #undef UNIQUE_SECTION
 211 #define UNIQUE_SECTION(DECL,RELOC)                              \
 212 do {                                                            \
 213   int len;                                                      \
 214   const char *name, *prefix;                                    \
 215   char *string;                                                 \
 216                                                                 \
 217   name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL));       \
 218                                                                 \
 219   if (! DECL_ONE_ONLY (DECL))                                   \
 220     {                                                           \
 221       if (TREE_CODE (DECL) == FUNCTION_DECL)                    \
 222         prefix = ".text.";                                      \
 223       else if (DECL_READONLY_SECTION (DECL, RELOC))             \
 224         prefix = ".rodata.";                                    \
 225       else                                                      \
 226         prefix = ".data.";                                      \
 227     }                                                           \
 228   else if (TREE_CODE (DECL) == FUNCTION_DECL)                   \
 229     prefix = ".gnu.linkonce.t.";                                \
 230   else if (DECL_READONLY_SECTION (DECL, RELOC))                 \
 231     prefix = ".gnu.linkonce.r.";                                \
 232   else                                                          \
 233     prefix = ".gnu.linkonce.d.";                                \
 234                                                                 \
 235   len = strlen (name) + strlen (prefix);                        \
 236   string = alloca (len + 1);                                    \
 237   sprintf (string, "%s%s", prefix, name);                       \
 238                                                                 \
 239   DECL_SECTION_NAME (DECL) = build_string (len, string);        \
 240 } while (0)