gcc/config/i386/djgpp.h

   1 /* Configuration for an i386 running MS-DOS with DJGPP.
   2    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002
   3    Free Software Foundation, Inc.
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU CC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU CC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22 /* Support generation of DWARF2 debugging info.  */
  23 #define DWARF2_DEBUGGING_INFO
  24
  25 /* Don't assume anything about the header files.  */
  26 #define NO_IMPLICIT_EXTERN_C
  27
  28 #define HANDLE_SYSV_PRAGMA
  29
  30 /* Enable parsing of #pragma pack(push,<n>) and #pragma pack(pop).  */
  31 #define HANDLE_PRAGMA_PACK_PUSH_POP 1
  32
  33 #include "i386/unix.h"
  34 #include "i386/bsd.h"
  35 #include "i386/gas.h"
  36
  37 /* If defined, a C expression whose value is a string containing the
  38    assembler operation to identify the following data as
  39    uninitialized global data.  If not defined, and neither
  40    `ASM_OUTPUT_BSS' nor `ASM_OUTPUT_ALIGNED_BSS' are defined,
  41    uninitialized global data will be output in the data section if
  42    `-fno-common' is passed, otherwise `ASM_OUTPUT_COMMON' will be
  43    used.  */
  44 #undef BSS_SECTION_ASM_OP
  45 #define BSS_SECTION_ASM_OP "\t.section\t.bss"
  46
  47 /* Define the name of the .data section.  */
  48 #undef DATA_SECTION_ASM_OP
  49 #define DATA_SECTION_ASM_OP "\t.section .data"
  50
  51 /* Define the name of the .ident op.  */
  52 #undef IDENT_ASM_OP
  53 #define IDENT_ASM_OP "\t.ident\t"
  54
  55 /* Enable alias attribute support.  */
  56 #ifndef SET_ASM_OP
  57 #define SET_ASM_OP "\t.set\t"
  58 #endif
  59
  60 /* Define the name of the .text section.  */
  61 #undef TEXT_SECTION_ASM_OP
  62 #define TEXT_SECTION_ASM_OP "\t.section .text"
  63
  64 /* Define standard DJGPP installation paths.                             */
  65 /* We override default /usr or /usr/local part with /dev/env/DJDIR which */
  66 /* points to actual DJGPP instalation directory.                         */
  67
  68 /* Standard include directory */
  69 #undef STANDARD_INCLUDE_DIR
  70 #define STANDARD_INCLUDE_DIR "/dev/env/DJDIR/include/"
  71
  72 /* Search for as.exe and ld.exe in DJGPP's binary directory.  */
  73 #undef MD_EXEC_PREFIX
  74 #define MD_EXEC_PREFIX "/dev/env/DJDIR/bin/"
  75
  76 /* Standard DJGPP library and startup files */
  77 #undef MD_STARTFILE_PREFIX
  78 #define MD_STARTFILE_PREFIX "/dev/env/DJDIR/lib/"
  79
  80 /* Correctly handle absolute filename detection in cp/xref.c */
  81 #define FILE_NAME_ABSOLUTE_P(NAME) \
  82         (((NAME)[0] == '/') || ((NAME)[0] == '\\') || \
  83         (((NAME)[0] >= 'A') && ((NAME)[0] <= 'z') && ((NAME)[1] == ':')))
  84
  85 #undef CPP_PREDEFINES
  86 #define CPP_PREDEFINES "-D__MSDOS__ -D__GO32__ -Asystem=msdos"
  87
  88 /* Include <sys/version.h> so __DJGPP__ and __DJGPP_MINOR__ are defined.  */
  89 #undef CPP_SPEC
  90 #define CPP_SPEC "-remap %(cpp_cpu) %{posix:-D_POSIX_SOURCE} \
  91   %{!ansi:%{!std=c*:%{!std=i*:-DMSDOS}}} %{!ansi:%{!std=c*:%{!std=i*:-DGO32}}} \
  92   -imacros %s../include/sys/version.h"
  93
  94 /* We need to override link_command_spec in gcc.c so support -Tdjgpp.djl.
  95    This cannot be done in LINK_SPECS as that LINK_SPECS is processed
  96    before library search directories are known by the linker.
  97    This avoids problems when specs file is not available. An alternate way,
  98    suggested by Robert Hoehne, is to use SUBTARGET_EXTRA_SPECS instead.
  99 */
 100
 101 #undef LINK_COMMAND_SPEC
 102 #define LINK_COMMAND_SPEC \
 103 "%{!fsyntax-only: \
 104 %{!c:%{!M:%{!MM:%{!E:%{!S:%(linker) %l %X %{o*} %{A} %{d} %{e*} %{m} %{N} %{n} \
 105 \t%{r} %{s} %{t} %{u*} %{x} %{z} %{Z}\
 106 \t%{!A:%{!nostdlib:%{!nostartfiles:%S}}}\
 107 \t%{static:} %{L*} %D %o\
 108 \t%{!nostdlib:%{!nodefaultlibs:%G %L %G}}\
 109 \t%{!A:%{!nostdlib:%{!nostartfiles:%E}}}\
 110 \t-Tdjgpp.djl %{T*}}}}}}}\n\
 111 %{!c:%{!M:%{!MM:%{!E:%{!S:stubify %{v} %{o*:%*} %{!o*:a.out} }}}}}"
 112
 113 /* Always just link in 'libc.a'.  */
 114 #undef LIB_SPEC
 115 #define LIB_SPEC "-lc"
 116
 117 /* Pick the right startup code depending on the -pg flag.  */
 118 #undef STARTFILE_SPEC
 119 #define STARTFILE_SPEC "%{pg:gcrt0.o%s}%{!pg:crt0.o%s}"
 120
 121 /* Make sure that gcc will not look for .h files in /usr/local/include
 122    unless user explicitly requests it.  */
 123 #undef LOCAL_INCLUDE_DIR
 124
 125 /* Switch into a generic section.  */
 126 #define TARGET_ASM_NAMED_SECTION  default_coff_asm_named_section
 127
 128 /* Output at beginning of assembler file.  */
 129 /* The .file command should always begin the output.  */
 130
 131 #undef ASM_FILE_START
 132 #define ASM_FILE_START(FILE)                                            \
 133   do {                                                                  \
 134         output_file_directive (FILE, main_input_filename);              \
 135   } while (0)
 136
 137 /* This is how to output an assembler line
 138    that says to advance the location counter
 139    to a multiple of 2**LOG bytes.  */
 140
 141 #undef ASM_OUTPUT_ALIGN
 142 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
 143   if ((LOG) != 0) fprintf ((FILE), "\t.p2align %d\n", LOG)
 144
 145 /* This is how to output a global symbol in the BSS section.  */
 146 #undef ASM_OUTPUT_ALIGNED_BSS
 147 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 148   asm_output_aligned_bss ((FILE), (DECL), (NAME), (SIZE), (ALIGN))
 149
 150 /* This is how to tell assembler that a symbol is weak  */
 151 #undef ASM_WEAKEN_LABEL
 152 #define ASM_WEAKEN_LABEL(FILE,NAME) \
 153   do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
 154        fputc ('\n', FILE); } while (0)
 155
 156 /* djgpp automatically calls its own version of __main, so don't define one
 157    in libgcc, nor call one in main().  */
 158 #define HAS_INIT_SECTION
 159
 160 /* Definitions for types and sizes. Wide characters are 16-bits long so
 161    Win32 compiler add-ons will be wide character compatible.  */
 162 #undef WCHAR_TYPE_SIZE
 163 #define WCHAR_TYPE_SIZE 16
 164
 165 #undef WCHAR_TYPE
 166 #define WCHAR_TYPE "short unsigned int"
 167
 168 #undef WINT_TYPE
 169 #define WINT_TYPE "int"
 170
 171 #undef SIZE_TYPE
 172 #define SIZE_TYPE "long unsigned int"
 173
 174 #undef PTRDIFF_TYPE
 175 #define PTRDIFF_TYPE "int"
 176
 177 /* Used to be defined in xm-djgpp.h, but moved here for cross-compilers.  */
 178 #define LIBSTDCXX "-lstdcxx"
 179
 180 /* -mbnu210 is now ignored and obsolete. It was used to enable support for
 181    weak symbols, and .gnu.linkonce support.  */
 182 #undef MASK_BNU210
 183 #define MASK_BNU210 (0x40000000)
 184
 185 #define TARGET_VERSION fprintf (stderr, " (80386, MS-DOS DJGPP)");
 186
 187 #undef SUBTARGET_SWITCHES
 188 #define SUBTARGET_SWITCHES \
 189   { "no-bnu210", -MASK_BNU210, "Ignored (obsolete)" }, \
 190   { "bnu210", MASK_BNU210, "Ignored (obsolete)" },
 191
 192 /* Warn that -mbnu210 is now obsolete.  */
 193 #undef  SUBTARGET_OVERRIDE_OPTIONS
 194 #define SUBTARGET_OVERRIDE_OPTIONS \
 195 do \
 196   { \
 197     if (target_flags & MASK_BNU210) \
 198       { \
 199         warning ("-mbnu210 is ignored (option is obsolete)"); \
 200       } \
 201   } \
 202 while (0)
 203
 204 /* Support for C++ templates.  */
 205 #undef MAKE_DECL_ONE_ONLY
 206 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
 207
 208 #undef UNIQUE_SECTION
 209 #define UNIQUE_SECTION(DECL,RELOC)                              \
 210 do {                                                            \
 211   int len;                                                      \
 212   const char *name, *prefix;                                    \
 213   char *string;                                                 \
 214                                                                 \
 215   name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL));       \
 216   /* Strip off any encoding in fnname.  */                      \
 217   STRIP_NAME_ENCODING (name, name);                             \
 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)