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 1
  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 #define TARGET_OS_CPP_BUILTINS()                \
  86   do                                            \
  87     {                                           \
  88         builtin_define_std ("MSDOS");           \
  89         builtin_define_std ("GO32");            \
  90         builtin_assert ("system=msdos");        \
  91     }                                           \
  92   while (0)
  93
  94 /* Include <sys/version.h> so __DJGPP__ and __DJGPP_MINOR__ are defined.  */
  95 #undef CPP_SPEC
  96 #define CPP_SPEC "-remap %{posix:-D_POSIX_SOURCE} \
  97   -imacros %s../include/sys/version.h"
  98
  99 /* We need to override link_command_spec in gcc.c so support -Tdjgpp.djl.
 100    This cannot be done in LINK_SPECS as that LINK_SPECS is processed
 101    before library search directories are known by the linker.
 102    This avoids problems when specs file is not available. An alternate way,
 103    suggested by Robert Hoehne, is to use SUBTARGET_EXTRA_SPECS instead.
 104 */
 105
 106 #undef LINK_COMMAND_SPEC
 107 #define LINK_COMMAND_SPEC \
 108 "%{!fsyntax-only: \
 109 %{!c:%{!M:%{!MM:%{!E:%{!S:%(linker) %l %X %{o*} %{A} %{d} %{e*} %{m} %{N} %{n} \
 110 \t%{r} %{s} %{t} %{u*} %{x} %{z} %{Z}\
 111 \t%{!A:%{!nostdlib:%{!nostartfiles:%S}}}\
 112 \t%{static:} %{L*} %D %o\
 113 \t%{!nostdlib:%{!nodefaultlibs:%G %L %G}}\
 114 \t%{!A:%{!nostdlib:%{!nostartfiles:%E}}}\
 115 \t-Tdjgpp.djl %{T*}}}}}}}\n\
 116 %{!c:%{!M:%{!MM:%{!E:%{!S:stubify %{v} %{o*:%*} %{!o*:a.out} }}}}}"
 117
 118 /* Always just link in 'libc.a'.  */
 119 #undef LIB_SPEC
 120 #define LIB_SPEC "-lc"
 121
 122 /* Pick the right startup code depending on the -pg flag.  */
 123 #undef STARTFILE_SPEC
 124 #define STARTFILE_SPEC "%{pg:gcrt0.o%s}%{!pg:crt0.o%s}"
 125
 126 /* Make sure that gcc will not look for .h files in /usr/local/include
 127    unless user explicitly requests it.  */
 128 #undef LOCAL_INCLUDE_DIR
 129
 130 /* Switch into a generic section.  */
 131 #define TARGET_ASM_NAMED_SECTION  default_coff_asm_named_section
 132
 133 /* Output at beginning of assembler file.  */
 134 /* The .file command should always begin the output.  */
 135
 136 #undef ASM_FILE_START
 137 #define ASM_FILE_START(FILE)                                            \
 138   do {                                                                  \
 139         output_file_directive (FILE, main_input_filename);              \
 140   } while (0)
 141
 142 /* This is how to output an assembler line
 143    that says to advance the location counter
 144    to a multiple of 2**LOG bytes.  */
 145
 146 #undef ASM_OUTPUT_ALIGN
 147 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
 148   if ((LOG) != 0) fprintf ((FILE), "\t.p2align %d\n", LOG)
 149
 150 /* This is how to output a global symbol in the BSS section.  */
 151 #undef ASM_OUTPUT_ALIGNED_BSS
 152 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 153   asm_output_aligned_bss ((FILE), (DECL), (NAME), (SIZE), (ALIGN))
 154
 155 /* This is how to tell assembler that a symbol is weak  */
 156 #undef ASM_WEAKEN_LABEL
 157 #define ASM_WEAKEN_LABEL(FILE,NAME) \
 158   do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
 159        fputc ('\n', FILE); } while (0)
 160
 161 /* djgpp automatically calls its own version of __main, so don't define one
 162    in libgcc, nor call one in main().  */
 163 #define HAS_INIT_SECTION
 164
 165 /* Definitions for types and sizes. Wide characters are 16-bits long so
 166    Win32 compiler add-ons will be wide character compatible.  */
 167 #undef WCHAR_TYPE_SIZE
 168 #define WCHAR_TYPE_SIZE 16
 169
 170 #undef WCHAR_TYPE
 171 #define WCHAR_TYPE "short unsigned int"
 172
 173 #undef WINT_TYPE
 174 #define WINT_TYPE "int"
 175
 176 #undef SIZE_TYPE
 177 #define SIZE_TYPE "long unsigned int"
 178
 179 #undef PTRDIFF_TYPE
 180 #define PTRDIFF_TYPE "int"
 181
 182 /* Used to be defined in xm-djgpp.h, but moved here for cross-compilers.  */
 183 #define LIBSTDCXX "-lstdcxx"
 184
 185 /* -mbnu210 is now ignored and obsolete. It was used to enable support for
 186    weak symbols, and .gnu.linkonce support.  */
 187 #undef MASK_BNU210
 188 #define MASK_BNU210 (0x40000000)
 189
 190 #define TARGET_VERSION fprintf (stderr, " (80386, MS-DOS DJGPP)");
 191
 192 #undef SUBTARGET_SWITCHES
 193 #define SUBTARGET_SWITCHES \
 194   { "no-bnu210", -MASK_BNU210, "Ignored (obsolete)" }, \
 195   { "bnu210", MASK_BNU210, "Ignored (obsolete)" },
 196
 197 /* Warn that -mbnu210 is now obsolete.  */
 198 #undef  SUBTARGET_OVERRIDE_OPTIONS
 199 #define SUBTARGET_OVERRIDE_OPTIONS \
 200 do \
 201   { \
 202     if (target_flags & MASK_BNU210) \
 203       { \
 204         warning ("-mbnu210 is ignored (option is obsolete)"); \
 205       } \
 206   } \
 207 while (0)
 208
 209 /* Support for C++ templates.  */
 210 #undef MAKE_DECL_ONE_ONLY
 211 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)