1 /* Base configuration file for all FreeBSD targets.
2 Copyright (C) 1999, 2000 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC 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 2, or (at your option)
11 GNU CC 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.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
21 /* Common FreeBSD configuration.
22 All FreeBSD architectures should include this file, which will specify
24 Adapted from /usr/src/contrib/gcc/config/i386/freebsd.h,
25 /usr/src/contrib/gcc/config/svr4.h &
26 egcs/gcc/config/i386/freebsd-elf.h by
27 David O'Brien <obrien@FreeBSD.org>. */
29 /* $FreeBSD: src/contrib/gcc/config/freebsd.h,v 1.25.2.10 2002/06/20 23:12:36 obrien Exp $ */
30 /* $DragonFly: src/contrib/gcc/config/Attic/freebsd.h,v 1.2 2003/06/17 04:24:01 dillon Exp $ */
33 /* Cpp, assembler, linker, library, and startfile spec's. */
35 /* This defines which switch letters take arguments. On FreeBSD, most of
36 the normal cases (defined in gcc.c) apply, and we also have -h* and
37 -z* options (for the linker) (coming from SVR4).
38 We also have -R (alias --rpath), no -z, --soname (-h), --assert etc. */
40 #define FBSD_SWITCH_TAKES_ARG(CHAR) \
41 (DEFAULT_SWITCH_TAKES_ARG (CHAR) \
43 || (CHAR) == 'z' /* ignored by ld */ \
46 #undef SWITCH_TAKES_ARG
47 #define SWITCH_TAKES_ARG(CHAR) (FBSD_SWITCH_TAKES_ARG(CHAR))
49 /* This defines which multi-letter switches take arguments. */
51 #define FBSD_WORD_SWITCH_TAKES_ARG(STR) \
52 (DEFAULT_WORD_SWITCH_TAKES_ARG (STR) \
53 || !strcmp ((STR), "rpath") || !strcmp ((STR), "rpath-link") \
54 || !strcmp ((STR), "soname") || !strcmp ((STR), "defsym") \
55 || !strcmp ((STR), "assert") || !strcmp ((STR), "dynamic-linker"))
57 #undef WORD_SWITCH_TAKES_ARG
58 #define WORD_SWITCH_TAKES_ARG(STR) (FBSD_WORD_SWITCH_TAKES_ARG(STR))
60 /* Place spaces around this string. We depend on string splicing to produce
61 the final CPP_PREDEFINES value. */
63 #define FBSD_CPP_PREDEFINES \
64 " -D__FreeBSD__=4 -D__FreeBSD_cc_version=460001 -Dunix -Asystem(unix) -Asystem(FreeBSD) "
66 #define FBSD_CPP_SPEC " \
68 %{!maout: -D__ELF__} \
69 %{munderscores: -D__UNDERSCORES__} \
70 %{maout: %{!mno-underscores: -D__UNDERSCORES__}} \
71 %{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} \
72 %{posix:-D_POSIX_SOURCE}"
75 #define CPP_SPEC FBSD_CPP_SPEC
77 /* Provide a LIB_SPEC appropriate for FreeBSD. Before
78 __FreeBSD_version 500016, select the appropriate libc, depending on
79 whether we're doing profiling or need threads support. (similar to
80 the default, except no -lg, and no -p). At __FreeBSD_version
81 500016 and later, when threads support is requested include both
82 -lc and -lc_r instead of only -lc_r. */
85 #include <sys/param.h>
86 #if __FreeBSD_version >= 500016
89 %{!pg: %{pthread:-lc_r} -lc} \
90 %{pg: %{pthread:-lc_r_p} -lc_p} \
100 %{pthread:-lc_r_p}} \
105 /************************[ Target stuff ]***********************************/
107 /* All FreeBSD Architectures support the ELF object file format. */
108 #undef OBJECT_FORMAT_ELF
109 #define OBJECT_FORMAT_ELF
111 /* Don't assume anything about the header files. */
112 #undef NO_IMPLICIT_EXTERN_C
113 #define NO_IMPLICIT_EXTERN_C
115 /* Implicit library calls should use memcpy, not bcopy, etc. */
116 #undef TARGET_MEM_FUNCTIONS
117 #define TARGET_MEM_FUNCTIONS
119 /* Allow #sccs in preprocessor. */
120 #undef SCCS_DIRECTIVE
121 #define SCCS_DIRECTIVE
126 /* Code generation parameters. */
128 /* Don't default to pcc-struct-return, because gcc is the only compiler, and
129 we want to retain compatibility with older gcc versions
130 (even though the SVR4 ABI for the i386 says that records and unions are
131 returned in memory). */
132 #undef DEFAULT_PCC_STRUCT_RETURN
133 #define DEFAULT_PCC_STRUCT_RETURN 0
135 /* Writing `int' for a bitfield forces int alignment for the structure. */
136 /* XXX: ok for Alpha?? */
137 #undef PCC_BITFIELD_TYPE_MATTERS
138 #define PCC_BITFIELD_TYPE_MATTERS 1
140 /* Use periods rather than dollar signs in special g++ assembler names.
141 This ensures the configuration knows our system correctly so we can link
142 with libraries compiled with the native cc. */
143 #undef NO_DOLLAR_IN_LABEL
145 /* The prefix to add to user-visible assembler symbols.
146 For System V Release 4 & ELF the convention is *not* to prepend a leading
147 underscore onto user-level symbol names. */
149 #undef USER_LABEL_PREFIX
150 #define USER_LABEL_PREFIX ""
152 /* Handle #pragma weak and #pragma pack. */
153 #undef HANDLE_SYSV_PRAGMA
154 #define HANDLE_SYSV_PRAGMA
156 /* While FreeBSD ELF no longer uses our home-grown crtbegin.o/crtend.o and thus
157 could switch to the DWARF2 unwinding mechanisms. I don't want to make the
158 switch mid-branch. So continue to use sjlj-exceptions. */
159 #ifdef WANT_DWARF2_UNWIND
160 /* FreeBSD ELF will use DWARF2 unwinding in 5.0+, as some psABI requires it. */
161 #define DWARF2_UNWIND_INFO 1
163 /* Maintain compatibility with the FreeBSD {3,4}.x C++ ABI. */
164 #define DWARF2_UNWIND_INFO 0
167 /* Do not use ``thunks'' to implement C++ vtables. This method still has
168 fatal bugs. Also, GCC 3.0 will have a new C++ ABI that may not even
170 #undef DEFAULT_VTABLE_THUNKS
173 /************************[ Assembler stuff ]********************************/
175 /* Override the default comment-starter of "/". */
176 #undef ASM_COMMENT_START
177 #define ASM_COMMENT_START "#"
179 /* Attach a special .ident directive to the end of the file to identify
180 the version of GCC which compiled this code. The format of the .ident
181 string is patterned after the ones produced by native SVR4 C compilers. */
184 #define IDENT_ASM_OP "\t.ident\t"
186 /* Output #ident as a .ident. */
188 #undef ASM_OUTPUT_IDENT
189 #define ASM_OUTPUT_IDENT(FILE, NAME) \
190 fprintf ((FILE), "%s\"%s\"\n", IDENT_ASM_OP, (NAME));
192 /* Identify the front-end which produced this file. To keep symbol
193 space down, and not confuse kdb, only do this if the language is
194 not C. (svr4.h defines ASM_IDENTIFY_GCC but neglects this) */
196 #undef ASM_IDENTIFY_LANGUAGE
197 #define ASM_IDENTIFY_LANGUAGE(FILE) \
199 if (strcmp (lang_identify (), "c") != 0) \
200 output_lang_identify (FILE); \
204 #define ASM_FILE_END(FILE) \
206 if (!flag_no_ident) \
207 fprintf ((FILE), "%s\"GCC: (GNU) %s %s\"\n", \
208 IDENT_ASM_OP, lang_identify(), version_string); \
211 /* This is the pseudo-op used to generate a contiguous sequence of byte
212 values from a double-quoted string WITHOUT HAVING A TERMINATING NUL
213 AUTOMATICALLY APPENDED. This is the same for most SVR4 assemblers. */
215 #undef ASCII_DATA_ASM_OP
216 #define ASCII_DATA_ASM_OP "\t.ascii\t"
219 #define ASM_BYTE_OP "\t.byte\t"
221 /* This is how to allocate empty space in some section. The .zero
222 pseudo-op is used for this on most ELF assemblers. */
225 #define SKIP_ASM_OP "\t.zero\t"
227 /* A table of bytes codes used by the ASM_OUTPUT_ASCII and
228 ASM_OUTPUT_LIMITED_STRING macros. Each byte in the table
229 corresponds to a particular byte value [0..255]. For any
230 given byte value, if the value in the corresponding table
231 position is zero, the given character can be output directly.
232 If the table value is 1, the byte must be output as a \ooo
233 octal escape. If the tables value is anything else, then the
234 byte value should be output as a \ followed by the value
235 in the table. Note that we can use standard UN*X escape
236 sequences for many control characters, but we don't use
237 \a to represent BEL because some SVR4 assemblers (e.g. on
238 the i386) don't know about that. Also, we don't use \v
239 since some versions of gas, such as 2.2 did not accept it. */
242 "\1\1\1\1\1\1\1\1btn\1fr\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
243 \0\0\"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
244 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\\\0\0\0\
245 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\
246 \1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
247 \1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
248 \1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
249 \1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1"
251 /* Some SVR4 assemblers have a limit on the number of characters which
252 can appear in the operand of a .string directive. If your assembler
253 has such a limitation, you should define STRING_LIMIT to reflect that
254 limit. Note that at least some SVR4 assemblers have a limit on the
255 actual number of bytes in the double-quoted string, and that they
256 count each character in an escape sequence as one byte. Thus, an
257 escape sequence like \377 would count as four bytes.
259 If your target assembler doesn't support the .string directive, you
260 should define this to zero.
264 #define STRING_LIMIT ((unsigned) 256)
267 #define STRING_ASM_OP "\t.string\t"
269 /* Output the label which precedes a jumptable. Note that for all svr4/ELF
270 systems where we actually generate jumptables (which is to say every
271 SVR4 target except i386, where we use casesi instead) we put the jump-
272 tables into the .rodata section and since other stuff could have been
273 put into the .rodata section prior to any given jumptable, we have to
274 make sure that the location counter for the .rodata section gets pro-
275 perly re-aligned prior to the actual beginning of the jump table. */
278 #define ALIGN_ASM_OP "\t.align\t"
280 /* This says how to output assembler code to declare an
281 uninitialized external linkage data object. Under SVR4/ELF,
282 the linker seems to want the alignment of data objects
283 to depend on their types. We do exactly that here. */
286 #define COMMON_ASM_OP "\t.comm\t"
288 /* This says how to output assembler code to declare an
289 uninitialized internal linkage data object. Under SVR4/ELF,
290 the linker seems to want the alignment of data objects
291 to depend on their types. We do exactly that here. */
294 #define LOCAL_ASM_OP "\t.local\t"
296 #undef ASM_OUTPUT_BEFORE_CASE_LABEL
297 #define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE, PREFIX, NUM, TABLE) \
298 ASM_OUTPUT_ALIGN ((FILE), 2);
300 #undef ASM_OUTPUT_CASE_LABEL
301 #define ASM_OUTPUT_CASE_LABEL(FILE, PREFIX, NUM, JUMPTABLE) \
303 ASM_OUTPUT_BEFORE_CASE_LABEL ((FILE), (PREFIX), (NUM), (JUMPTABLE)) \
304 ASM_OUTPUT_INTERNAL_LABEL ((FILE), (PREFIX), (NUM)); \
307 /* The standard SVR4/ELF assembler seems to require that certain builtin
308 library routines (e.g. .udiv) be explicitly declared as .globl
309 in each assembly file where they are referenced. */
311 #undef ASM_OUTPUT_EXTERNAL_LIBCALL
312 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
313 ASM_GLOBALIZE_LABEL ((FILE), XSTR ((FUN), 0))
315 /* Support const sections and the ctors and dtors sections for g++.
316 Note that there appears to be two different ways to support const
317 sections at the moment. You can either #define the symbol
318 READONLY_DATA_SECTION (giving it some code which switches to the
319 readonly data section) or else you can #define the symbols
320 EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and
321 SELECT_RTX_SECTION. We do both here just to be on the safe side.
322 FreeBSD conditionalizes the use of ".section rodata" depending on
323 ELF mode - otherwise .text. */
325 #undef USE_CONST_SECTION
326 #define USE_CONST_SECTION TARGET_ELF
328 #undef CONST_SECTION_ASM_OP
329 #define CONST_SECTION_ASM_OP "\t.section\t.rodata"
331 /* Define the pseudo-ops used to switch to the .ctors and .dtors sections.
333 Note that we want to give these sections the SHF_WRITE attribute
334 because these sections will actually contain data (i.e. tables of
335 addresses of functions in the current root executable or shared library
336 file) and, in the case of a shared library, the relocatable addresses
337 will have to be properly resolved/relocated (and then written into) by
338 the dynamic linker when it actually attaches the given shared library
339 to the executing process. (Note that on SVR4, you may wish to use the
340 `-z text' option to the ELF linker, when building a shared library, as
341 an additional check that you are doing everything right. But if you do
342 use the `-z text' option when building a shared library, you will get
343 errors unless the .ctors and .dtors sections are marked as writable
344 via the SHF_WRITE attribute.) */
346 #undef CTORS_SECTION_ASM_OP
347 #define CTORS_SECTION_ASM_OP "\t.section\t.ctors,\"aw\""
348 #undef DTORS_SECTION_ASM_OP
349 #define DTORS_SECTION_ASM_OP "\t.section\t.dtors,\"aw\""
351 /* On SVR4, we *do* have support for the .init and .fini sections, and we
352 can put stuff in there to be executed before and after `main'. We let
353 crtstuff.c and other files know this by defining the following symbols.
354 The definitions say how to change sections to the .init and .fini
355 sections. This is the same for all known SVR4 assemblers. */
357 #undef INIT_SECTION_ASM_OP
358 #define INIT_SECTION_ASM_OP "\t.section\t.init"
359 #undef FINI_SECTION_ASM_OP
360 #define FINI_SECTION_ASM_OP "\t.section\t.fini"
362 /* A default list of other sections which we might be "in" at any given
363 time. For targets that use additional sections (e.g. .tdesc) you
364 should override this definition in the target-specific file which
365 includes this file. */
367 #undef EXTRA_SECTIONS
368 #define EXTRA_SECTIONS in_const, in_ctors, in_dtors
370 /* A default list of extra section function definitions. For targets
371 that use additional sections (e.g. .tdesc) you should override this
372 definition in the target-specific file which includes this file. */
374 #undef EXTRA_SECTION_FUNCTIONS
375 #define EXTRA_SECTION_FUNCTIONS \
376 CONST_SECTION_FUNCTION \
377 CTORS_SECTION_FUNCTION \
378 DTORS_SECTION_FUNCTION
380 #undef READONLY_DATA_SECTION
381 #define READONLY_DATA_SECTION() const_section ()
383 extern void text_section ();
385 #undef CONST_SECTION_FUNCTION
386 #define CONST_SECTION_FUNCTION \
390 if (!USE_CONST_SECTION) \
392 else if (in_section != in_const) \
394 fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP); \
395 in_section = in_const; \
399 #undef CTORS_SECTION_FUNCTION
400 #define CTORS_SECTION_FUNCTION \
404 if (in_section != in_ctors) \
406 fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP); \
407 in_section = in_ctors; \
411 #undef DTORS_SECTION_FUNCTION
412 #define DTORS_SECTION_FUNCTION \
416 if (in_section != in_dtors) \
418 fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP); \
419 in_section = in_dtors; \
423 /* A C statement or statements to switch to the appropriate
424 section for output of RTX in mode MODE. RTX is some kind
425 of constant in RTL. The argument MODE is redundant except
426 in the case of a `const_int' rtx. Currently, these always
427 go into the const section. */
429 #undef SELECT_RTX_SECTION
430 #define SELECT_RTX_SECTION(MODE, RTX) const_section()
432 /* Define the strings used for the special svr4/ELF .type and .size
433 directives. These strings generally do not vary from one svr4/ELF
434 system to another. */
437 #define TYPE_ASM_OP "\t.type\t"
439 #define SIZE_ASM_OP "\t.size\t"
441 /* This is how we tell the assembler that a symbol is weak. */
443 #undef ASM_WEAKEN_LABEL
444 #define ASM_WEAKEN_LABEL(FILE, NAME) \
446 fputs ("\t.globl\t", (FILE)); assemble_name ((FILE), (NAME)); \
447 fputc ('\n', (FILE)); \
448 fputs ("\t.weak\t", (FILE)); assemble_name ((FILE), (NAME)); \
449 fputc ('\n', (FILE)); \
452 /* The following macro defines the [default] format used with ELF to output
453 the second operand of the .type assembler directive. */
455 #undef TYPE_OPERAND_FMT
456 #define TYPE_OPERAND_FMT "@%s"
458 /* Write the extra assembler code needed to declare a function's result.
459 Most svr4/ELF assemblers don't require any special declaration of the
462 #undef ASM_DECLARE_RESULT
463 #define ASM_DECLARE_RESULT(FILE, RESULT)
465 /* These macros generate the special .type and .size directives which
466 are used to set the corresponding fields of the linker symbol table
467 entries in an ELF object file under SVR4/ELF. These macros also output
468 the starting labels for the relevant functions/objects. */
470 /* Write the extra assembler code needed to declare an object properly. */
472 #undef ASM_DECLARE_OBJECT_NAME
473 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
475 fprintf (FILE, "%s ", TYPE_ASM_OP); \
476 assemble_name (FILE, NAME); \
478 fprintf (FILE, TYPE_OPERAND_FMT, "object"); \
480 size_directive_output = 0; \
481 if (!flag_inhibit_size_directive && DECL_SIZE (DECL)) \
483 size_directive_output = 1; \
484 fprintf (FILE, "%s ", SIZE_ASM_OP); \
485 assemble_name (FILE, NAME); \
487 fprintf (FILE, HOST_WIDE_INT_PRINT_DEC, \
488 int_size_in_bytes (TREE_TYPE (DECL))); \
489 fputc ('\n', FILE); \
491 ASM_OUTPUT_LABEL(FILE, NAME); \
494 /* Output the size directive for a decl in rest_of_decl_compilation
495 in the case where we did not do so before the initializer.
496 Once we find the error_mark_node, we know that the value of
497 size_directive_output was set
498 by ASM_DECLARE_OBJECT_NAME when it was run for the same decl. */
500 #undef ASM_FINISH_DECLARE_OBJECT
501 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \
503 char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \
504 if (!flag_inhibit_size_directive && DECL_SIZE (DECL) \
505 && ! AT_END && TOP_LEVEL \
506 && DECL_INITIAL (DECL) == error_mark_node \
507 && !size_directive_output) \
509 size_directive_output = 1; \
510 fprintf (FILE, "%s ", SIZE_ASM_OP); \
511 assemble_name (FILE, name); \
513 fprintf (FILE, HOST_WIDE_INT_PRINT_DEC, \
514 int_size_in_bytes (TREE_TYPE (DECL))); \
515 fputc ('\n', FILE); \
520 /************************[ Debugger stuff ]*********************************/
522 /* All ELF targets can support DWARF-2. */
523 #undef DWARF2_DEBUGGING_INFO
524 #define DWARF2_DEBUGGING_INFO
526 /* This is BSD, so we want the DBX format. */
527 #undef DBX_DEBUGGING_INFO
528 #define DBX_DEBUGGING_INFO
530 /* This is BSD, so use stabs instead of DWARF debug format. */
531 #undef PREFERRED_DEBUGGING_TYPE
532 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
534 /* But allow STABS to be supported as well.
535 Note that we want to override some definition settings done for some
536 architecture's native OS's tools that don't apply to us. */
537 #undef ASM_IDENTIFY_GCC
538 #undef ASM_IDENTIFY_LANGUAGE