gcc/config/i386/djgpp.h

   1 /* Configuration for an i386 running MS-DOS with DJGPP.
   2    Copyright (C) 1997-2013 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC 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 3, or (at your option)
   9 any later version.
  10
  11 GCC 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 GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 /* Support generation of DWARF2 debugging info.  */
  21 #define DWARF2_DEBUGGING_INFO 1
  22
  23 /* Don't assume anything about the header files.  */
  24 #define NO_IMPLICIT_EXTERN_C
  25
  26 #undef BSS_SECTION_ASM_OP
  27 #define BSS_SECTION_ASM_OP "\t.section\t.bss"
  28
  29 /* Define the name of the .data section.  */
  30 #undef DATA_SECTION_ASM_OP
  31 #define DATA_SECTION_ASM_OP "\t.section .data"
  32
  33 /* Enable alias attribute support.  */
  34 #ifndef SET_ASM_OP
  35 #define SET_ASM_OP "\t.set\t"
  36 #endif
  37
  38 /* Define the name of the .text section.  */
  39 #undef TEXT_SECTION_ASM_OP
  40 #define TEXT_SECTION_ASM_OP "\t.section .text"
  41
  42 /* Define standard DJGPP installation paths.  */
  43 /* We override default /usr or /usr/local part with /dev/env/DJDIR which */
  44 /* points to actual DJGPP installation directory.  */
  45
  46 /* Search for as.exe and ld.exe in DJGPP's binary directory.  */
  47 #undef MD_EXEC_PREFIX
  48 #define MD_EXEC_PREFIX "/dev/env/DJDIR/bin/"
  49
  50 /* Standard DJGPP library and startup files */
  51 #undef MD_STARTFILE_PREFIX
  52 #define MD_STARTFILE_PREFIX "/dev/env/DJDIR/lib/"
  53
  54 /* Correctly handle absolute filename detection in cp/xref.c */
  55 #define FILE_NAME_ABSOLUTE_P(NAME) \
  56         (((NAME)[0] == '/') || ((NAME)[0] == '\\') || \
  57         (((NAME)[0] >= 'A') && ((NAME)[0] <= 'z') && ((NAME)[1] == ':')))
  58
  59 #define TARGET_OS_CPP_BUILTINS()                \
  60   do                                            \
  61     {                                           \
  62         builtin_define_std ("MSDOS");           \
  63         builtin_define_std ("GO32");            \
  64         builtin_assert ("system=msdos");        \
  65     }                                           \
  66   while (0)
  67
  68 /* Include <sys/version.h> so __DJGPP__ and __DJGPP_MINOR__ are defined.  */
  69 #undef CPP_SPEC
  70 #define CPP_SPEC "-remap %{posix:-D_POSIX_SOURCE} \
  71   -imacros %s../include/sys/version.h"
  72
  73 /* We need to override link_command_spec in gcc.c so support -Tdjgpp.djl.
  74    This cannot be done in LINK_SPECS as that LINK_SPECS is processed
  75    before library search directories are known by the linker.
  76    This avoids problems when specs file is not available. An alternate way,
  77    suggested by Robert Hoehne, is to use SUBTARGET_EXTRA_SPECS instead.
  78 */
  79
  80 #undef LINK_COMMAND_SPEC
  81 #define LINK_COMMAND_SPEC \
  82 "%{!fsyntax-only: \
  83 %{!c:%{!M:%{!MM:%{!E:%{!S:%(linker) %l %X %{o*} %{e*} %{N} %{n} \
  84 \t%{r} %{s} %{t} %{u*} %{z} %{Z}\
  85 \t%{!nostdlib:%{!nostartfiles:%S}}\
  86 \t%{static:} %{L*} %D %o\
  87 \t%{!nostdlib:%{!nodefaultlibs:%G %L %G}}\
  88 \t%{!nostdlib:%{!nostartfiles:%E}}\
  89 \t-Tdjgpp.djl %{T*}}}}}}}\n\
  90 %{!c:%{!M:%{!MM:%{!E:%{!S:stubify %{v} %{o*:%*} %{!o*:a.out} }}}}}"
  91
  92 /* Always just link in 'libc.a'.  */
  93 #undef LIB_SPEC
  94 #define LIB_SPEC "-lc"
  95
  96 /* Pick the right startup code depending on the -pg flag.  */
  97 #undef STARTFILE_SPEC
  98 #define STARTFILE_SPEC "%{pg:gcrt0.o%s}%{!pg:crt0.o%s}"
  99
 100 /* Make sure that gcc will not look for .h files in /usr/local/include
 101    unless user explicitly requests it.  */
 102 #undef LOCAL_INCLUDE_DIR
 103
 104 /* Switch into a generic section.  */
 105 #define TARGET_ASM_NAMED_SECTION  default_coff_asm_named_section
 106
 107 /* This is how to output an assembler line
 108    that says to advance the location counter
 109    to a multiple of 2**LOG bytes.  */
 110
 111 #undef ASM_OUTPUT_ALIGN
 112 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
 113   if ((LOG) != 0) fprintf ((FILE), "\t.p2align %d\n", LOG)
 114
 115 /* This is how to output a global symbol in the BSS section.  */
 116 #undef ASM_OUTPUT_ALIGNED_BSS
 117 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 118   asm_output_aligned_bss ((FILE), (DECL), (NAME), (SIZE), (ALIGN))
 119
 120 /* Write the extra assembler code needed to declare a function properly.  */
 121
 122 #ifndef ASM_DECLARE_FUNCTION_NAME
 123 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)             \
 124   do                                                            \
 125     {                                                           \
 126       ASM_OUTPUT_FUNCTION_LABEL (FILE, NAME, DECL);             \
 127     }                                                           \
 128   while (0)
 129 #endif
 130
 131 /* This is how to tell assembler that a symbol is weak  */
 132 #undef ASM_WEAKEN_LABEL
 133 #define ASM_WEAKEN_LABEL(FILE,NAME) \
 134   do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
 135        fputc ('\n', FILE); } while (0)
 136
 137 /* djgpp automatically calls its own version of __main, so don't define one
 138    in libgcc, nor call one in main().  */
 139 #define HAS_INIT_SECTION
 140
 141 #undef TARGET_LIBC_HAS_FUNCTION
 142 #define TARGET_LIBC_HAS_FUNCTION no_c99_libc_has_function
 143
 144 /* Definitions for types and sizes. Wide characters are 16-bits long so
 145    Win32 compiler add-ons will be wide character compatible.  */
 146 #undef WCHAR_TYPE_SIZE
 147 #define WCHAR_TYPE_SIZE 16
 148
 149 #undef WCHAR_TYPE
 150 #define WCHAR_TYPE "short unsigned int"
 151
 152 #undef WINT_TYPE
 153 #define WINT_TYPE "int"
 154
 155 #undef SIZE_TYPE
 156 #define SIZE_TYPE "long unsigned int"
 157
 158 #undef PTRDIFF_TYPE
 159 #define PTRDIFF_TYPE "int"
 160
 161 /* Used to be defined in xm-djgpp.h, but moved here for cross-compilers.  */
 162 #define LIBSTDCXX "stdcxx"
 163
 164 /* Warn that -mbnu210 is now obsolete.  */
 165 #undef  SUBTARGET_OVERRIDE_OPTIONS
 166 #define SUBTARGET_OVERRIDE_OPTIONS \
 167 do \
 168   { \
 169     if (TARGET_BNU210) \
 170       { \
 171         warning (0, "-mbnu210 is ignored (option is obsolete)"); \
 172       } \
 173   } \
 174 while (0)
 175
 176 /* Support for C++ templates.  */
 177 #undef MAKE_DECL_ONE_ONLY
 178 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)