gcc/config/i386/djgpp.h

   1 /* Configuration for an i386 running MS-DOS with DJGPP.
   2    Copyright (C) 1997-2018 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 #undef PREFERRED_DEBUGGING_TYPE
  24 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
  25
  26 /* Don't assume anything about the header files.  */
  27 #define NO_IMPLICIT_EXTERN_C
  28
  29 #undef BSS_SECTION_ASM_OP
  30 #define BSS_SECTION_ASM_OP "\t.section\t.bss"
  31
  32 /* Define the name of the .data section.  */
  33 #undef DATA_SECTION_ASM_OP
  34 #define DATA_SECTION_ASM_OP "\t.section .data"
  35
  36 /* Define the name of the .ident op.  */
  37 #undef TARGET_ASM_OUTPUT_IDENT
  38 #define TARGET_ASM_OUTPUT_IDENT default_asm_output_ident_directive
  39
  40 /* Enable alias attribute support.  */
  41 #ifndef SET_ASM_OP
  42 #define SET_ASM_OP "\t.set\t"
  43 #endif
  44
  45 /* Define the name of the .text section.  */
  46 #undef TEXT_SECTION_ASM_OP
  47 #define TEXT_SECTION_ASM_OP "\t.section .text"
  48
  49 #define TARGET_OS_CPP_BUILTINS()                \
  50   do                                            \
  51     {                                           \
  52         if (!flag_iso)                          \
  53            builtin_define_with_int_value ("DJGPP",2);  \
  54         builtin_define_with_int_value ("__DJGPP",2);   \
  55         builtin_define_with_int_value ("__DJGPP__",2); \
  56         builtin_define_std ("MSDOS");           \
  57         builtin_define_std ("GO32");            \
  58         builtin_define_std ("unix");            \
  59         builtin_assert ("system=msdos");        \
  60     }                                           \
  61   while (0)
  62
  63 #undef CPP_SPEC
  64 #define CPP_SPEC "-remap %{posix:-D_POSIX_SOURCE}"
  65
  66 #undef POST_LINK_SPEC
  67 #define POST_LINK_SPEC "stubify %{v} %{o*:%*} %{!o*:a.out}"
  68
  69 /* Always just link in 'libc.a'.  */
  70 #undef LIB_SPEC
  71 #define LIB_SPEC "-lc"
  72
  73 /* Pick the right startup code depending on the -pg flag.  */
  74 #undef STARTFILE_SPEC
  75 #define STARTFILE_SPEC "%{pg:gcrt0.o%s}%{!pg:crt0.o%s}"
  76
  77 /* Switch into a generic section.  */
  78 #define TARGET_ASM_NAMED_SECTION  i386_djgpp_asm_named_section
  79
  80 /* This is how to output an assembler line
  81    that says to advance the location counter
  82    to a multiple of 2**LOG bytes.  */
  83
  84 #undef ASM_OUTPUT_ALIGN
  85 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
  86   if ((LOG) != 0) fprintf ((FILE), "\t.p2align %d\n", LOG)
  87
  88 /* This is how to output a global symbol in the BSS section.  */
  89 #undef ASM_OUTPUT_ALIGNED_BSS
  90 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
  91   asm_output_aligned_bss ((FILE), (DECL), (NAME), (SIZE), (ALIGN))
  92
  93 /* Write the extra assembler code needed to declare a function properly.  */
  94
  95 #ifndef ASM_DECLARE_FUNCTION_NAME
  96 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)             \
  97   do                                                            \
  98     {                                                           \
  99       ASM_OUTPUT_FUNCTION_LABEL (FILE, NAME, DECL);             \
 100     }                                                           \
 101   while (0)
 102 #endif
 103
 104 /* This is how to tell assembler that a symbol is weak  */
 105 #undef ASM_WEAKEN_LABEL
 106 #define ASM_WEAKEN_LABEL(FILE,NAME) \
 107   do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
 108        fputc ('\n', FILE); } while (0)
 109
 110 /* djgpp automatically calls its own version of __main, so don't define one
 111    in libgcc, nor call one in main().  */
 112 #define HAS_INIT_SECTION
 113
 114 #undef TARGET_LIBC_HAS_FUNCTION
 115 #define TARGET_LIBC_HAS_FUNCTION no_c99_libc_has_function
 116
 117 /* Definitions for types and sizes. Wide characters are 16-bits long so
 118    Win32 compiler add-ons will be wide character compatible.  */
 119 #undef WCHAR_TYPE_SIZE
 120 #define WCHAR_TYPE_SIZE 16
 121
 122 #undef WCHAR_TYPE
 123 #define WCHAR_TYPE "short unsigned int"
 124
 125 #undef WINT_TYPE
 126 #define WINT_TYPE "int"
 127
 128 #undef SIZE_TYPE
 129 #define SIZE_TYPE "long unsigned int"
 130
 131 #undef PTRDIFF_TYPE
 132 #define PTRDIFF_TYPE "int"
 133
 134 #undef DBX_REGISTER_NUMBER
 135 #define DBX_REGISTER_NUMBER(n) svr4_dbx_register_map[n]
 136
 137 /* Default to pcc-struct-return.  */
 138 #define DEFAULT_PCC_STRUCT_RETURN 1
 139
 140 /* Ignore (with warning) -fPIC for DJGPP */
 141 #undef SUBTARGET_OVERRIDE_OPTIONS
 142 #define SUBTARGET_OVERRIDE_OPTIONS                                      \
 143     do {                                                                \
 144         if (flag_pic)                                                   \
 145         {                                                               \
 146             fnotice(stdout, "-f%s ignored (not supported for DJGPP)\n", \
 147                 (flag_pic > 1) ? "PIC" : "pic");                        \
 148             flag_pic = 0;                                               \
 149         }                                                               \
 150                                                                         \
 151         /* Don't emit DWARF3/4 unless specifically selected. */         \
 152         /* DWARF3/4 currently does not work for DJGPP.  */              \
 153         if (!global_options_set.x_dwarf_version)                        \
 154             dwarf_version = 2;                                          \
 155                                                                         \
 156         }                                                               \
 157     while (0)
 158
 159 /* Support for C++ templates.  */
 160 #undef MAKE_DECL_ONE_ONLY
 161 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
 162
 163 /* Function protypes for gcc/i386/djgpp.c */
 164
 165 void
 166 i386_djgpp_asm_named_section(const char *name, unsigned int flags,
 167                              tree decl);