gcc/config/i386/djgpp.h

   1 /* Configuration for an i386 running MS-DOS with DJGPP.
   2    Copyright (C) 1997, 1998, 1999 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
  22 #include "dbxcoff.h"
  23
  24 /* Don't assume anything about the header files. */
  25 #define NO_IMPLICIT_EXTERN_C
  26
  27 #define HANDLE_SYSV_PRAGMA
  28
  29 /* Enable parsing of #pragma pack(push,<n>) and #pragma pack(pop).  */
  30 #define HANDLE_PRAGMA_PACK_PUSH_POP 1
  31
  32 #define YES_UNDERSCORES
  33
  34 #include "i386/gas.h"
  35
  36 /* Enable alias attribute support.  */
  37 #ifndef SET_ASM_OP
  38 #define SET_ASM_OP "\t.set"
  39 #endif
  40
  41 /* Search for as.exe and ld.exe in DJGPP's binary directory. */
  42 #define MD_EXEC_PREFIX "$DJDIR/bin/"
  43
  44 /* Correctly handle absolute filename detection in cp/xref.c */
  45 #define FILE_NAME_ABSOLUTE_P(NAME) \
  46         (((NAME)[0] == '/') || ((NAME)[0] == '\\') || \
  47         (((NAME)[0] >= 'A') && ((NAME)[0] <= 'z') && ((NAME)[1] == ':')))
  48
  49 #ifdef CPP_PREDEFINES
  50 #undef CPP_PREDEFINES
  51 #endif
  52 #define CPP_PREDEFINES "-Dunix -Di386 -DGO32 -DDJGPP=2 -DMSDOS \
  53   -Asystem(unix) -Asystem(msdos) -Acpu(i386) -Amachine(i386)"
  54
  55 /* We need to override link_command_spec in gcc.c so support -Tdjgpp.djl.
  56    This cannot be done in LINK_SPECS as that LINK_SPECS is processed
  57    before library search directories are known by the linker.
  58    This avoids problems when specs file is not available. An alternate way,
  59    suggested by Robert Hoehne, is to use SUBTARGET_EXTRA_SPECS instead.
  60 */
  61
  62 #undef LINK_COMMAND_SPEC
  63 #define LINK_COMMAND_SPEC \
  64 "%{!fsyntax-only: \
  65 %{!c:%{!M:%{!MM:%{!E:%{!S:%(linker) %l %X %{o*} %{A} %{d} %{e*} %{m} %{N} %{n} \
  66 \t%{r} %{s} %{t} %{u*} %{x} %{z} %{Z}\
  67 \t%{!A:%{!nostdlib:%{!nostartfiles:%S}}}\
  68 \t%{static:} %{L*} %D %o\
  69 \t%{!nostdlib:%{!nodefaultlibs:%G %L %G}}\
  70 \t%{!A:%{!nostdlib:%{!nostartfiles:%E}}}\
  71 \t-Tdjgpp.djl %{T*}}}}}}}\n\
  72 %{!c:%{!M:%{!MM:%{!E:%{!S:stubify %{v} %{o*:%*} %{!o*:a.out} }}}}}"
  73
  74 /* Make sure that gcc will not look for .h files in /usr/local/include
  75    unless user explicitly requests it.  */
  76 #undef LOCAL_INCLUDE_DIR
  77
  78 #undef EXTRA_SECTIONS
  79 #define EXTRA_SECTIONS in_ctor, in_dtor
  80
  81 #undef EXTRA_SECTION_FUNCTIONS
  82 #define EXTRA_SECTION_FUNCTIONS                                 \
  83   CTOR_SECTION_FUNCTION                                         \
  84   DTOR_SECTION_FUNCTION
  85
  86 #define CTOR_SECTION_FUNCTION                                   \
  87 void                                                            \
  88 ctor_section ()                                                 \
  89 {                                                               \
  90   if (in_section != in_ctor)                                    \
  91     {                                                           \
  92       fprintf (asm_out_file, "\t.section .ctor\n");             \
  93       in_section = in_ctor;                                     \
  94     }                                                           \
  95 }
  96
  97 #define DTOR_SECTION_FUNCTION                                   \
  98 void                                                            \
  99 dtor_section ()                                                 \
 100 {                                                               \
 101   if (in_section != in_dtor)                                    \
 102     {                                                           \
 103       fprintf (asm_out_file, "\t.section .dtor\n");             \
 104       in_section = in_dtor;                                     \
 105     }                                                           \
 106 }
 107
 108 #define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME)       \
 109   do {                                          \
 110     ctor_section ();                            \
 111     fprintf (FILE, "%s\t", ASM_LONG);           \
 112     assemble_name (FILE, NAME);                 \
 113     fprintf (FILE, "\n");                       \
 114   } while (0)
 115
 116 /* Allow (eg) __attribute__((section "locked")) to work */
 117 #define ASM_OUTPUT_SECTION_NAME(FILE, DECL, NAME, RELOC)\
 118   do {                                          \
 119     fprintf (FILE, "\t.section %s\n", NAME);    \
 120   } while (0)
 121
 122 #define ASM_OUTPUT_DESTRUCTOR(FILE,NAME)        \
 123   do {                                          \
 124     dtor_section ();                            \
 125     fprintf (FILE, "%s\t", ASM_LONG);           \
 126     assemble_name (FILE, NAME);                 \
 127     fprintf (FILE, "\n");                       \
 128   } while (0)
 129
 130 /* Output at beginning of assembler file.  */
 131 /* The .file command should always begin the output.  */
 132
 133 #undef ASM_FILE_START
 134 #define ASM_FILE_START(FILE)                                            \
 135   do {                                                                  \
 136         output_file_directive (FILE, main_input_filename);              \
 137   } while (0)
 138
 139 /* This is how to output an assembler line
 140    that says to advance the location counter
 141    to a multiple of 2**LOG bytes.  */
 142
 143 #undef ASM_OUTPUT_ALIGN
 144 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
 145   if ((LOG) != 0) fprintf ((FILE), "\t.p2align %d\n", LOG)
 146
 147 /* djgpp has atexit ().  */
 148 #undef HAVE_ATEXIT
 149 #define HAVE_ATEXIT
 150
 151 /* djgpp automatically calls its own version of __main, so don't define one
 152    in libgcc, nor call one in main().  */
 153 #define HAS_INIT_SECTION