1 /* Configuration for an i386 running MS-DOS with DJGPP.
2 Copyright (C) 1997-2023 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 #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 /* Define the name of the .ident op. */
34 #undef TARGET_ASM_OUTPUT_IDENT
35 #define TARGET_ASM_OUTPUT_IDENT default_asm_output_ident_directive
36
37 /* Enable alias attribute support. */
38 #ifndef SET_ASM_OP
39 #define SET_ASM_OP "\t.set\t"
40 #endif
41
42 /* Define the name of the .text section. */
43 #undef TEXT_SECTION_ASM_OP
44 #define TEXT_SECTION_ASM_OP "\t.section .text"
45
46 #define TARGET_OS_CPP_BUILTINS() \
47 do \
48 { \
49 if (!flag_iso) \
50 builtin_define_with_int_value ("DJGPP",2); \
51 builtin_define_with_int_value ("__DJGPP",2); \
52 builtin_define_with_int_value ("__DJGPP__",2); \
53 builtin_define_std ("MSDOS"); \
54 builtin_define_std ("GO32"); \
55 builtin_define_std ("unix"); \
56 builtin_assert ("system=msdos"); \
57 } \
58 while (0)
59
60 #undef CPP_SPEC
61 #define CPP_SPEC "-remap %{posix:-D_POSIX_SOURCE}"
62
63 #undef POST_LINK_SPEC
64 #define POST_LINK_SPEC "stubify %{v} %{o*:%*} %{!o*:a.out}"
65
66 /* Always just link in 'libc.a'. */
67 #undef LIB_SPEC
68 #define LIB_SPEC "-lc"
69
70 /* Pick the right startup code depending on the -pg flag. */
71 #undef STARTFILE_SPEC
72 #define STARTFILE_SPEC "%{pg:gcrt0.o%s}%{!pg:crt0.o%s}"
73
74 /* Switch into a generic section. */
75 #define TARGET_ASM_NAMED_SECTION i386_djgpp_asm_named_section
76
77 /* This is how to output an assembler line
78 that says to advance the location counter
79 to a multiple of 2**LOG bytes. */
80
81 #undef ASM_OUTPUT_ALIGN
82 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
83 if ((LOG) != 0) fprintf ((FILE), "\t.p2align %d\n", LOG)
84
85 /* This is how to output a global symbol in the BSS section. */
86 #undef ASM_OUTPUT_ALIGNED_BSS
87 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
88 asm_output_aligned_bss ((FILE), (DECL), (NAME), (SIZE), (ALIGN))
89
90 /* Write the extra assembler code needed to declare a function properly. */
91
92 #ifndef ASM_DECLARE_FUNCTION_NAME
93 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
94 do \
95 { \
96 ASM_OUTPUT_FUNCTION_LABEL (FILE, NAME, DECL); \
97 } \
98 while (0)
99 #endif
100
101 /* This is how to tell assembler that a symbol is weak */
102 #undef ASM_WEAKEN_LABEL
103 #define ASM_WEAKEN_LABEL(FILE,NAME) \
104 do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
105 fputc ('\n', FILE); } while (0)
106
107 /* djgpp automatically calls its own version of __main, so don't define one
108 in libgcc, nor call one in main(). */
109 #define HAS_INIT_SECTION
110
111 #undef TARGET_LIBC_HAS_FUNCTION
112 #define TARGET_LIBC_HAS_FUNCTION no_c99_libc_has_function
113
114 /* Definitions for types and sizes. Wide characters are 16-bits long so
115 Win32 compiler add-ons will be wide character compatible. */
116 #undef WCHAR_TYPE_SIZE
117 #define WCHAR_TYPE_SIZE 16
118
119 #undef WCHAR_TYPE
120 #define WCHAR_TYPE "short unsigned int"
121
122 #undef WINT_TYPE
123 #define WINT_TYPE "int"
124
125 #undef SIZE_TYPE
126 #define SIZE_TYPE "long unsigned int"
127
128 #undef PTRDIFF_TYPE
129 #define PTRDIFF_TYPE "int"
130
131 #undef DEBUGGER_REGNO
132 #define DEBUGGER_REGNO(n) svr4_debugger_register_map[n]
133
134 /* Default to pcc-struct-return. */
135 #define DEFAULT_PCC_STRUCT_RETURN 1
136
137 /* Ignore (with warning) -fPIC for DJGPP */
138 #undef SUBTARGET_OVERRIDE_OPTIONS
139 #define SUBTARGET_OVERRIDE_OPTIONS \
140 do { \
141 if (flag_pic) \
142 { \
143 fnotice(stdout, "-f%s ignored (not supported for DJGPP)\n", \
144 (flag_pic > 1) ? "PIC" : "pic"); \
145 flag_pic = 0; \
146 } \
147 \
148 /* Don't emit DWARF3/4 unless specifically selected. */ \
149 /* DWARF3/4 currently does not work for DJGPP. */ \
150 if (!OPTION_SET_P (dwarf_version)) \
151 dwarf_version = 2; \
152 \
153 } \
154 while (0)
155
156 /* Support for C++ templates. */
157 #undef MAKE_DECL_ONE_ONLY
158 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
159
160 #undef TARGET_COFF
161 #define TARGET_COFF 1
162
163 /* Kludge because of missing COFF support for early LTO debug. */
164 #undef TARGET_ASM_LTO_START
165 #define TARGET_ASM_LTO_START i386_djgpp_asm_lto_start
166 #undef TARGET_ASM_LTO_END
167 #define TARGET_ASM_LTO_END i386_djgpp_asm_lto_end
168
169 /* Function protypes for gcc/i386/djgpp.cc */
170
171 void
172 i386_djgpp_asm_named_section(const char *name, unsigned int flags,
173 tree decl);
174 void i386_djgpp_asm_lto_start (void);
175 void i386_djgpp_asm_lto_end (void);