gcc/config/i386/djgpp.h

   1 /* Configuration for an i386 running MS-DOS with DJGPP.
   2    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2004
   3    Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC 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 GCC 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 GCC; 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 1
  29
  30 /* Enable parsing of #pragma pack(push,<n>) and #pragma pack(pop).  */
  31 #define HANDLE_PRAGMA_PACK_PUSH_POP 1
  32
  33 /* If defined, a C expression whose value is a string containing the
  34    assembler operation to identify the following data as
  35    uninitialized global data.  If not defined, and neither
  36    `ASM_OUTPUT_BSS' nor `ASM_OUTPUT_ALIGNED_BSS' are defined,
  37    uninitialized global data will be output in the data section if
  38    `-fno-common' is passed, otherwise `ASM_OUTPUT_COMMON' will be
  39    used.  */
  40 #undef BSS_SECTION_ASM_OP
  41 #define BSS_SECTION_ASM_OP "\t.section\t.bss"
  42
  43 /* Define the name of the .data section.  */
  44 #undef DATA_SECTION_ASM_OP
  45 #define DATA_SECTION_ASM_OP "\t.section .data"
  46
  47 /* Define the name of the .ident op.  */
  48 #undef IDENT_ASM_OP
  49 #define IDENT_ASM_OP "\t.ident\t"
  50
  51 /* Enable alias attribute support.  */
  52 #ifndef SET_ASM_OP
  53 #define SET_ASM_OP "\t.set\t"
  54 #endif
  55
  56 /* Define the name of the .text section.  */
  57 #undef TEXT_SECTION_ASM_OP
  58 #define TEXT_SECTION_ASM_OP "\t.section .text"
  59
  60 /* Define standard DJGPP installation paths.  */
  61 /* We override default /usr or /usr/local part with /dev/env/DJDIR which */
  62 /* points to actual DJGPP installation directory.  */
  63
  64 /* Standard include directory */
  65 #undef STANDARD_INCLUDE_DIR
  66 #define STANDARD_INCLUDE_DIR "/dev/env/DJDIR/include/"
  67
  68 /* Search for as.exe and ld.exe in DJGPP's binary directory.  */
  69 #undef MD_EXEC_PREFIX
  70 #define MD_EXEC_PREFIX "/dev/env/DJDIR/bin/"
  71
  72 /* Standard DJGPP library and startup files */
  73 #undef MD_STARTFILE_PREFIX
  74 #define MD_STARTFILE_PREFIX "/dev/env/DJDIR/lib/"
  75
  76 /* Correctly handle absolute filename detection in cp/xref.c */
  77 #define FILE_NAME_ABSOLUTE_P(NAME) \
  78         (((NAME)[0] == '/') || ((NAME)[0] == '\\') || \
  79         (((NAME)[0] >= 'A') && ((NAME)[0] <= 'z') && ((NAME)[1] == ':')))
  80
  81 #define TARGET_OS_CPP_BUILTINS()                \
  82   do                                            \
  83     {                                           \
  84         builtin_define_std ("MSDOS");           \
  85         builtin_define_std ("GO32");            \
  86         builtin_assert ("system=msdos");        \
  87     }                                           \
  88   while (0)
  89
  90 /* Include <sys/version.h> so __DJGPP__ and __DJGPP_MINOR__ are defined.  */
  91 #undef CPP_SPEC
  92 #define CPP_SPEC "-remap %{posix:-D_POSIX_SOURCE} \
  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 /* This is how to output an assembler line
 130    that says to advance the location counter
 131    to a multiple of 2**LOG bytes.  */
 132
 133 #undef ASM_OUTPUT_ALIGN
 134 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
 135   if ((LOG) != 0) fprintf ((FILE), "\t.p2align %d\n", LOG)
 136
 137 /* This is how to output a global symbol in the BSS section.  */
 138 #undef ASM_OUTPUT_ALIGNED_BSS
 139 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 140   asm_output_aligned_bss ((FILE), (DECL), (NAME), (SIZE), (ALIGN))
 141
 142 /* This is how to tell assembler that a symbol is weak  */
 143 #undef ASM_WEAKEN_LABEL
 144 #define ASM_WEAKEN_LABEL(FILE,NAME) \
 145   do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
 146        fputc ('\n', FILE); } while (0)
 147
 148 /* djgpp automatically calls its own version of __main, so don't define one
 149    in libgcc, nor call one in main().  */
 150 #define HAS_INIT_SECTION
 151
 152 /* Definitions for types and sizes. Wide characters are 16-bits long so
 153    Win32 compiler add-ons will be wide character compatible.  */
 154 #undef WCHAR_TYPE_SIZE
 155 #define WCHAR_TYPE_SIZE 16
 156
 157 #undef WCHAR_TYPE
 158 #define WCHAR_TYPE "short unsigned int"
 159
 160 #undef WINT_TYPE
 161 #define WINT_TYPE "int"
 162
 163 #undef SIZE_TYPE
 164 #define SIZE_TYPE "long unsigned int"
 165
 166 #undef PTRDIFF_TYPE
 167 #define PTRDIFF_TYPE "int"
 168
 169 /* Used to be defined in xm-djgpp.h, but moved here for cross-compilers.  */
 170 #define LIBSTDCXX "-lstdcxx"
 171
 172 /* -mbnu210 is now ignored and obsolete. It was used to enable support for
 173    weak symbols, and .gnu.linkonce support.  */
 174 #undef MASK_BNU210
 175 #define MASK_BNU210 (0x40000000)
 176
 177 #define TARGET_VERSION fprintf (stderr, " (80386, MS-DOS DJGPP)");
 178
 179 #undef SUBTARGET_SWITCHES
 180 #define SUBTARGET_SWITCHES \
 181   { "no-bnu210", -MASK_BNU210, "Ignored (obsolete)" }, \
 182   { "bnu210", MASK_BNU210, "Ignored (obsolete)" },
 183
 184 /* Warn that -mbnu210 is now obsolete.  */
 185 #undef  SUBTARGET_OVERRIDE_OPTIONS
 186 #define SUBTARGET_OVERRIDE_OPTIONS \
 187 do \
 188   { \
 189     if (target_flags & MASK_BNU210) \
 190       { \
 191         warning ("-mbnu210 is ignored (option is obsolete)"); \
 192       } \
 193   } \
 194 while (0)
 195
 196 /* Support for C++ templates.  */
 197 #undef MAKE_DECL_ONE_ONLY
 198 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)