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 /* How to output an unaligned integer.  */
  66 #undef UNALIGNED_INT_ASM_OP
  67 #define UNALIGNED_INT_ASM_OP "\t.long\t"
  68
  69 /* How to output an unaligned double length integer.  */
  70 #undef UNALIGNED_DOUBLE_INT_ASM_OP
  71 #define UNALIGNED_DOUBLE_INT_ASM_OP "\t.quad\t"
  72
  73 /* How to output an unaligned half length intenger.  */
  74 #undef UNALIGNED_SHORT_ASM_OP
  75 #define UNALIGNED_SHORT_ASM_OP "\t.short\t"
  76
  77 /* Define standard DJGPP installation paths.                             */
  78 /* We override default /usr or /usr/local part with /dev/env/DJDIR which */
  79 /* points to actual DJGPP instalation directory.                         */
  80
  81 /* Standard include directory */
  82 #undef STANDARD_INCLUDE_DIR
  83 #define STANDARD_INCLUDE_DIR "/dev/env/DJDIR/include/"
  84
  85 /* Search for as.exe and ld.exe in DJGPP's binary directory.  */
  86 #undef MD_EXEC_PREFIX
  87 #define MD_EXEC_PREFIX "/dev/env/DJDIR/bin/"
  88
  89 /* Standard DJGPP library and startup files */
  90 #undef MD_STARTFILE_PREFIX
  91 #define MD_STARTFILE_PREFIX "/dev/env/DJDIR/lib/"
  92
  93 /* Correctly handle absolute filename detection in cp/xref.c */
  94 #define FILE_NAME_ABSOLUTE_P(NAME) \
  95         (((NAME)[0] == '/') || ((NAME)[0] == '\\') || \
  96         (((NAME)[0] >= 'A') && ((NAME)[0] <= 'z') && ((NAME)[1] == ':')))
  97
  98 #undef CPP_PREDEFINES
  99 #define CPP_PREDEFINES "-D__MSDOS__ -D__GO32__ -Asystem=msdos"
 100
 101 /* Include <sys/version.h> so __DJGPP__ and __DJGPP_MINOR__ are defined.  */
 102 #undef CPP_SPEC
 103 #define CPP_SPEC "-remap %(cpp_cpu) %{posix:-D_POSIX_SOURCE} \
 104   %{!ansi:%{!std=c*:%{!std=i*:-DMSDOS}}} %{!ansi:%{!std=c*:%{!std=i*:-DGO32}}} \
 105   -imacros %s../include/sys/version.h"
 106
 107 /* We need to override link_command_spec in gcc.c so support -Tdjgpp.djl.
 108    This cannot be done in LINK_SPECS as that LINK_SPECS is processed
 109    before library search directories are known by the linker.
 110    This avoids problems when specs file is not available. An alternate way,
 111    suggested by Robert Hoehne, is to use SUBTARGET_EXTRA_SPECS instead.
 112 */
 113
 114 #undef LINK_COMMAND_SPEC
 115 #define LINK_COMMAND_SPEC \
 116 "%{!fsyntax-only: \
 117 %{!c:%{!M:%{!MM:%{!E:%{!S:%(linker) %l %X %{o*} %{A} %{d} %{e*} %{m} %{N} %{n} \
 118 \t%{r} %{s} %{t} %{u*} %{x} %{z} %{Z}\
 119 \t%{!A:%{!nostdlib:%{!nostartfiles:%S}}}\
 120 \t%{static:} %{L*} %D %o\
 121 \t%{!nostdlib:%{!nodefaultlibs:%G %L %G}}\
 122 \t%{!A:%{!nostdlib:%{!nostartfiles:%E}}}\
 123 \t-Tdjgpp.djl %{T*}}}}}}}\n\
 124 %{!c:%{!M:%{!MM:%{!E:%{!S:stubify %{v} %{o*:%*} %{!o*:a.out} }}}}}"
 125
 126 /* Always just link in 'libc.a'.  */
 127 #undef LIB_SPEC
 128 #define LIB_SPEC "-lc"
 129
 130 /* Pick the right startup code depending on the -pg flag.  */
 131 #undef STARTFILE_SPEC
 132 #define STARTFILE_SPEC "%{pg:gcrt0.o%s}%{!pg:crt0.o%s}"
 133
 134 /* Make sure that gcc will not look for .h files in /usr/local/include
 135    unless user explicitly requests it.  */
 136 #undef LOCAL_INCLUDE_DIR
 137
 138 /* Switch into a generic section.  */
 139 #define TARGET_ASM_NAMED_SECTION  default_coff_asm_named_section
 140
 141 /* Output at beginning of assembler file.  */
 142 /* The .file command should always begin the output.  */
 143
 144 #undef ASM_FILE_START
 145 #define ASM_FILE_START(FILE)                                            \
 146   do {                                                                  \
 147         output_file_directive (FILE, main_input_filename);              \
 148   } while (0)
 149
 150 /* This is how to output an assembler line
 151    that says to advance the location counter
 152    to a multiple of 2**LOG bytes.  */
 153
 154 #undef ASM_OUTPUT_ALIGN
 155 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
 156   if ((LOG) != 0) fprintf ((FILE), "\t.p2align %d\n", LOG)
 157
 158 /* This is how to output a global symbol in the BSS section.  */
 159 #undef ASM_OUTPUT_ALIGNED_BSS
 160 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 161   asm_output_aligned_bss ((FILE), (DECL), (NAME), (SIZE), (ALIGN))
 162
 163 /* This is how to tell assembler that a symbol is weak  */
 164 #undef ASM_WEAKEN_LABEL
 165 #define ASM_WEAKEN_LABEL(FILE,NAME) \
 166   do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
 167        fputc ('\n', FILE); } while (0)
 168
 169 /* djgpp automatically calls its own version of __main, so don't define one
 170    in libgcc, nor call one in main().  */
 171 #define HAS_INIT_SECTION
 172
 173 /* Definitions for types and sizes. Wide characters are 16-bits long so
 174    Win32 compiler add-ons will be wide character compatible.  */
 175 #undef WCHAR_UNSIGNED
 176 #define WCHAR_UNSIGNED 1
 177
 178 #undef WCHAR_TYPE_SIZE
 179 #define WCHAR_TYPE_SIZE 16
 180
 181 #undef WCHAR_TYPE
 182 #define WCHAR_TYPE "short unsigned int"
 183
 184 #undef WINT_TYPE
 185 #define WINT_TYPE "int"
 186
 187 #undef SIZE_TYPE
 188 #define SIZE_TYPE "long unsigned int"
 189
 190 #undef PTRDIFF_TYPE
 191 #define PTRDIFF_TYPE "int"
 192
 193 /* Used to be defined in xm-djgpp.h, but moved here for cross-compilers.  */
 194 #define LIBSTDCXX "-lstdcxx"
 195
 196 /* -mbnu210 is now ignored and obsolete. It was used to enable support for
 197    weak symbols, and .gnu.linkonce support.  */
 198 #undef MASK_BNU210
 199 #define MASK_BNU210 (0x40000000)
 200
 201 #undef SUBTARGET_SWITCHES
 202 #define SUBTARGET_SWITCHES \
 203   { "no-bnu210", -MASK_BNU210, "Ignored (obsolete)" }, \
 204   { "bnu210", MASK_BNU210, "Ignored (obsolete)" },
 205
 206 /* Warn that -mbnu210 is now obsolete.  */
 207 #undef  SUBTARGET_OVERRIDE_OPTIONS
 208 #define SUBTARGET_OVERRIDE_OPTIONS \
 209 do \
 210   { \
 211     if (target_flags & MASK_BNU210) \
 212       { \
 213         warning ("-mbnu210 is ignored (option is obsolete)"); \
 214       } \
 215   } \
 216 while (0)
 217
 218 /* Support for C++ templates.  */
 219 #undef MAKE_DECL_ONE_ONLY
 220 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
 221
 222 #undef UNIQUE_SECTION
 223 #define UNIQUE_SECTION(DECL,RELOC)                              \
 224 do {                                                            \
 225   int len;                                                      \
 226   const char *name, *prefix;                                    \
 227   char *string;                                                 \
 228                                                                 \
 229   name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL));       \
 230                                                                 \
 231   if (! DECL_ONE_ONLY (DECL))                                   \
 232     {                                                           \
 233       if (TREE_CODE (DECL) == FUNCTION_DECL)                    \
 234         prefix = ".text.";                                      \
 235       else if (DECL_READONLY_SECTION (DECL, RELOC))             \
 236         prefix = ".rodata.";                                    \
 237       else                                                      \
 238         prefix = ".data.";                                      \
 239     }                                                           \
 240   else if (TREE_CODE (DECL) == FUNCTION_DECL)                   \
 241     prefix = ".gnu.linkonce.t.";                                \
 242   else if (DECL_READONLY_SECTION (DECL, RELOC))                 \
 243     prefix = ".gnu.linkonce.r.";                                \
 244   else                                                          \
 245     prefix = ".gnu.linkonce.d.";                                \
 246                                                                 \
 247   len = strlen (name) + strlen (prefix);                        \
 248   string = alloca (len + 1);                                    \
 249   sprintf (string, "%s%s", prefix, name);                       \
 250                                                                 \
 251   DECL_SECTION_NAME (DECL) = build_string (len, string);        \
 252 } while (0)