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, 2005, 2007,
   3    2010, 2011, 2012 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 3, 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 COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 /* Support generation of DWARF2 debugging info.  */
  22 #define DWARF2_DEBUGGING_INFO 1
  23
  24 /* Don't assume anything about the header files.  */
  25 #define NO_IMPLICIT_EXTERN_C
  26
  27 #undef BSS_SECTION_ASM_OP
  28 #define BSS_SECTION_ASM_OP "\t.section\t.bss"
  29
  30 /* Define the name of the .data section.  */
  31 #undef DATA_SECTION_ASM_OP
  32 #define DATA_SECTION_ASM_OP "\t.section .data"
  33
  34 /* Enable alias attribute support.  */
  35 #ifndef SET_ASM_OP
  36 #define SET_ASM_OP "\t.set\t"
  37 #endif
  38
  39 /* Define the name of the .text section.  */
  40 #undef TEXT_SECTION_ASM_OP
  41 #define TEXT_SECTION_ASM_OP "\t.section .text"
  42
  43 /* Define standard DJGPP installation paths.  */
  44 /* We override default /usr or /usr/local part with /dev/env/DJDIR which */
  45 /* points to actual DJGPP installation directory.  */
  46
  47 /* Search for as.exe and ld.exe in DJGPP's binary directory.  */
  48 #undef MD_EXEC_PREFIX
  49 #define MD_EXEC_PREFIX "/dev/env/DJDIR/bin/"
  50
  51 /* Standard DJGPP library and startup files */
  52 #undef MD_STARTFILE_PREFIX
  53 #define MD_STARTFILE_PREFIX "/dev/env/DJDIR/lib/"
  54
  55 /* Correctly handle absolute filename detection in cp/xref.c */
  56 #define FILE_NAME_ABSOLUTE_P(NAME) \
  57         (((NAME)[0] == '/') || ((NAME)[0] == '\\') || \
  58         (((NAME)[0] >= 'A') && ((NAME)[0] <= 'z') && ((NAME)[1] == ':')))
  59
  60 #define TARGET_OS_CPP_BUILTINS()                \
  61   do                                            \
  62     {                                           \
  63         builtin_define_std ("MSDOS");           \
  64         builtin_define_std ("GO32");            \
  65         builtin_assert ("system=msdos");        \
  66     }                                           \
  67   while (0)
  68
  69 /* Include <sys/version.h> so __DJGPP__ and __DJGPP_MINOR__ are defined.  */
  70 #undef CPP_SPEC
  71 #define CPP_SPEC "-remap %{posix:-D_POSIX_SOURCE} \
  72   -imacros %s../include/sys/version.h"
  73
  74 /* We need to override link_command_spec in gcc.c so support -Tdjgpp.djl.
  75    This cannot be done in LINK_SPECS as that LINK_SPECS is processed
  76    before library search directories are known by the linker.
  77    This avoids problems when specs file is not available. An alternate way,
  78    suggested by Robert Hoehne, is to use SUBTARGET_EXTRA_SPECS instead.
  79 */
  80
  81 #undef LINK_COMMAND_SPEC
  82 #define LINK_COMMAND_SPEC \
  83 "%{!fsyntax-only: \
  84 %{!c:%{!M:%{!MM:%{!E:%{!S:%(linker) %l %X %{o*} %{e*} %{N} %{n} \
  85 \t%{r} %{s} %{t} %{u*} %{z} %{Z}\
  86 \t%{!nostdlib:%{!nostartfiles:%S}}\
  87 \t%{static:} %{L*} %D %o\
  88 \t%{!nostdlib:%{!nodefaultlibs:%G %L %G}}\
  89 \t%{!nostdlib:%{!nostartfiles:%E}}\
  90 \t-Tdjgpp.djl %{T*}}}}}}}\n\
  91 %{!c:%{!M:%{!MM:%{!E:%{!S:stubify %{v} %{o*:%*} %{!o*:a.out} }}}}}"
  92
  93 /* Always just link in 'libc.a'.  */
  94 #undef LIB_SPEC
  95 #define LIB_SPEC "-lc"
  96
  97 /* Pick the right startup code depending on the -pg flag.  */
  98 #undef STARTFILE_SPEC
  99 #define STARTFILE_SPEC "%{pg:gcrt0.o%s}%{!pg:crt0.o%s}"
 100
 101 /* Make sure that gcc will not look for .h files in /usr/local/include
 102    unless user explicitly requests it.  */
 103 #undef LOCAL_INCLUDE_DIR
 104
 105 /* Switch into a generic section.  */
 106 #define TARGET_ASM_NAMED_SECTION  default_coff_asm_named_section
 107
 108 /* This is how to output an assembler line
 109    that says to advance the location counter
 110    to a multiple of 2**LOG bytes.  */
 111
 112 #undef ASM_OUTPUT_ALIGN
 113 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
 114   if ((LOG) != 0) fprintf ((FILE), "\t.p2align %d\n", LOG)
 115
 116 /* This is how to output a global symbol in the BSS section.  */
 117 #undef ASM_OUTPUT_ALIGNED_BSS
 118 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 119   asm_output_aligned_bss ((FILE), (DECL), (NAME), (SIZE), (ALIGN))
 120
 121 /* This is how to tell assembler that a symbol is weak  */
 122 #undef ASM_WEAKEN_LABEL
 123 #define ASM_WEAKEN_LABEL(FILE,NAME) \
 124   do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
 125        fputc ('\n', FILE); } while (0)
 126
 127 /* djgpp automatically calls its own version of __main, so don't define one
 128    in libgcc, nor call one in main().  */
 129 #define HAS_INIT_SECTION
 130
 131 /* Definitions for types and sizes. Wide characters are 16-bits long so
 132    Win32 compiler add-ons will be wide character compatible.  */
 133 #undef WCHAR_TYPE_SIZE
 134 #define WCHAR_TYPE_SIZE 16
 135
 136 #undef WCHAR_TYPE
 137 #define WCHAR_TYPE "short unsigned int"
 138
 139 #undef WINT_TYPE
 140 #define WINT_TYPE "int"
 141
 142 #undef SIZE_TYPE
 143 #define SIZE_TYPE "long unsigned int"
 144
 145 #undef PTRDIFF_TYPE
 146 #define PTRDIFF_TYPE "int"
 147
 148 /* Used to be defined in xm-djgpp.h, but moved here for cross-compilers.  */
 149 #define LIBSTDCXX "stdcxx"
 150
 151 /* Warn that -mbnu210 is now obsolete.  */
 152 #undef  SUBTARGET_OVERRIDE_OPTIONS
 153 #define SUBTARGET_OVERRIDE_OPTIONS \
 154 do \
 155   { \
 156     if (TARGET_BNU210) \
 157       { \
 158         warning (0, "-mbnu210 is ignored (option is obsolete)"); \
 159       } \
 160   } \
 161 while (0)
 162
 163 /* Support for C++ templates.  */
 164 #undef MAKE_DECL_ONE_ONLY
 165 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)