djgpp.h revision 117395 
1/* Configuration for an i386 running MS-DOS with DJGPP.
2   Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002
3   Free Software Foundation, Inc.
4
5This file is part of GNU CC.
6
7GNU CC is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 2, or (at your option)
10any later version.
11
12GNU CC is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
18along with GNU CC; see the file COPYING.  If not, write to
19the Free Software Foundation, 59 Temple Place - Suite 330,
20Boston, MA 02111-1307, USA.  */
21
22/* Support generation of DWARF2 debugging info.  */
23#define DWARF2_DEBUGGING_INFO 1
24
25/* Don't assume anything about the header files.  */
26#define NO_IMPLICIT_EXTERN_C
27
28#define HANDLE_SYSV_PRAGMA 1
29
30/* Enable parsing of #pragma pack(push,<n>) and #pragma pack(pop).  */
31#define HANDLE_PRAGMA_PACK_PUSH_POP 1
32
33#include "i386/unix.h"
34#include "i386/bsd.h"
35#include "i386/gas.h"
36
37/* If defined, a C expression whose value is a string containing the
38   assembler operation to identify the following data as
39   uninitialized global data.  If not defined, and neither
40   `ASM_OUTPUT_BSS' nor `ASM_OUTPUT_ALIGNED_BSS' are defined,
41   uninitialized global data will be output in the data section if
42   `-fno-common' is passed, otherwise `ASM_OUTPUT_COMMON' will be
43   used.  */
44#undef BSS_SECTION_ASM_OP
45#define BSS_SECTION_ASM_OP "\t.section\t.bss"
46
47/* Define the name of the .data section.  */
48#undef DATA_SECTION_ASM_OP
49#define DATA_SECTION_ASM_OP "\t.section .data"
50
51/* Define the name of the .ident op.  */
52#undef IDENT_ASM_OP
53#define IDENT_ASM_OP "\t.ident\t"
54
55/* Enable alias attribute support.  */
56#ifndef SET_ASM_OP
57#define SET_ASM_OP "\t.set\t"
58#endif
59
60/* Define the name of the .text section.  */
61#undef TEXT_SECTION_ASM_OP
62#define TEXT_SECTION_ASM_OP "\t.section .text"
63
64/* Define standard DJGPP installation paths.                             */
65/* We override default /usr or /usr/local part with /dev/env/DJDIR which */
66/* points to actual DJGPP instalation directory.                         */
67
68/* Standard include directory */
69#undef STANDARD_INCLUDE_DIR
70#define STANDARD_INCLUDE_DIR "/dev/env/DJDIR/include/"
71
72/* Search for as.exe and ld.exe in DJGPP's binary directory.  */
73#undef MD_EXEC_PREFIX
74#define MD_EXEC_PREFIX "/dev/env/DJDIR/bin/"
75
76/* Standard DJGPP library and startup files */
77#undef MD_STARTFILE_PREFIX
78#define MD_STARTFILE_PREFIX "/dev/env/DJDIR/lib/"
79
80/* Correctly handle absolute filename detection in cp/xref.c */
81#define FILE_NAME_ABSOLUTE_P(NAME) \
82        (((NAME)[0] == '/') || ((NAME)[0] == '\\') || \
83        (((NAME)[0] >= 'A') && ((NAME)[0] <= 'z') && ((NAME)[1] == ':')))
84
85#define TARGET_OS_CPP_BUILTINS()		\
86  do						\
87    {						\
88	builtin_define_std ("MSDOS");		\
89	builtin_define_std ("GO32");		\
90	builtin_assert ("system=msdos");	\
91    }						\
92  while (0)
93
94/* Include <sys/version.h> so __DJGPP__ and __DJGPP_MINOR__ are defined.  */
95#undef CPP_SPEC
96#define CPP_SPEC "-remap %{posix:-D_POSIX_SOURCE} \
97  -imacros %s../include/sys/version.h"
98
99/* We need to override link_command_spec in gcc.c so support -Tdjgpp.djl.
100   This cannot be done in LINK_SPECS as that LINK_SPECS is processed
101   before library search directories are known by the linker.
102   This avoids problems when specs file is not available. An alternate way,
103   suggested by Robert Hoehne, is to use SUBTARGET_EXTRA_SPECS instead.
104*/
105
106#undef LINK_COMMAND_SPEC
107#define LINK_COMMAND_SPEC \
108"%{!fsyntax-only: \
109%{!c:%{!M:%{!MM:%{!E:%{!S:%(linker) %l %X %{o*} %{A} %{d} %{e*} %{m} %{N} %{n} \
110\t%{r} %{s} %{t} %{u*} %{x} %{z} %{Z}\
111\t%{!A:%{!nostdlib:%{!nostartfiles:%S}}}\
112\t%{static:} %{L*} %D %o\
113\t%{!nostdlib:%{!nodefaultlibs:%G %L %G}}\
114\t%{!A:%{!nostdlib:%{!nostartfiles:%E}}}\
115\t-Tdjgpp.djl %{T*}}}}}}}\n\
116%{!c:%{!M:%{!MM:%{!E:%{!S:stubify %{v} %{o*:%*} %{!o*:a.out} }}}}}"
117
118/* Always just link in 'libc.a'.  */
119#undef LIB_SPEC
120#define LIB_SPEC "-lc"
121
122/* Pick the right startup code depending on the -pg flag.  */
123#undef STARTFILE_SPEC
124#define STARTFILE_SPEC "%{pg:gcrt0.o%s}%{!pg:crt0.o%s}"
125
126/* Make sure that gcc will not look for .h files in /usr/local/include
127   unless user explicitly requests it.  */
128#undef LOCAL_INCLUDE_DIR
129
130/* Switch into a generic section.  */
131#define TARGET_ASM_NAMED_SECTION  default_coff_asm_named_section
132
133/* Output at beginning of assembler file.  */
134/* The .file command should always begin the output.  */
135
136#undef ASM_FILE_START
137#define ASM_FILE_START(FILE)						\
138  do {									\
139	if (ix86_asm_dialect == ASM_INTEL)				\
140	  fputs ("\t.intel_syntax\n", FILE);				\
141	output_file_directive (FILE, main_input_filename);		\
142  } while (0)
143
144/* This is how to output an assembler line
145   that says to advance the location counter
146   to a multiple of 2**LOG bytes.  */
147
148#undef ASM_OUTPUT_ALIGN
149#define ASM_OUTPUT_ALIGN(FILE,LOG) \
150  if ((LOG) != 0) fprintf ((FILE), "\t.p2align %d\n", LOG)
151
152/* This is how to output a global symbol in the BSS section.  */
153#undef ASM_OUTPUT_ALIGNED_BSS
154#define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
155  asm_output_aligned_bss ((FILE), (DECL), (NAME), (SIZE), (ALIGN))
156
157/* This is how to tell assembler that a symbol is weak  */
158#undef ASM_WEAKEN_LABEL
159#define ASM_WEAKEN_LABEL(FILE,NAME) \
160  do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
161       fputc ('\n', FILE); } while (0)
162
163/* djgpp automatically calls its own version of __main, so don't define one
164   in libgcc, nor call one in main().  */
165#define HAS_INIT_SECTION
166
167/* Definitions for types and sizes. Wide characters are 16-bits long so
168   Win32 compiler add-ons will be wide character compatible.  */
169#undef WCHAR_TYPE_SIZE
170#define WCHAR_TYPE_SIZE 16
171
172#undef WCHAR_TYPE
173#define WCHAR_TYPE "short unsigned int"
174
175#undef WINT_TYPE
176#define WINT_TYPE "int"
177
178#undef SIZE_TYPE
179#define SIZE_TYPE "long unsigned int"
180
181#undef PTRDIFF_TYPE
182#define PTRDIFF_TYPE "int"
183
184/* Used to be defined in xm-djgpp.h, but moved here for cross-compilers.  */
185#define LIBSTDCXX "-lstdcxx"
186
187/* -mbnu210 is now ignored and obsolete. It was used to enable support for
188   weak symbols, and .gnu.linkonce support.  */
189#undef MASK_BNU210
190#define MASK_BNU210 (0x40000000)
191
192#define TARGET_VERSION fprintf (stderr, " (80386, MS-DOS DJGPP)");
193
194#undef SUBTARGET_SWITCHES
195#define SUBTARGET_SWITCHES \
196  { "no-bnu210", -MASK_BNU210, "Ignored (obsolete)" }, \
197  { "bnu210", MASK_BNU210, "Ignored (obsolete)" },
198
199/* Warn that -mbnu210 is now obsolete.  */
200#undef  SUBTARGET_OVERRIDE_OPTIONS
201#define SUBTARGET_OVERRIDE_OPTIONS \
202do \
203  { \
204    if (target_flags & MASK_BNU210) \
205      {	\
206        warning ("-mbnu210 is ignored (option is obsolete)"); \
207      }	\
208  } \
209while (0)
210
211/* Support for C++ templates.  */
212#undef MAKE_DECL_ONE_ONLY
213#define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
214