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 $ */
32 /* Cpp, assembler, linker, library, and startfile spec's. */
34 /* This defines which switch letters take arguments. On FreeBSD, most of
35 the normal cases (defined in gcc.c) apply, and we also have -h* and
36 -z* options (for the linker) (coming from SVR4).
37 We also have -R (alias --rpath), no -z, --soname (-h), --assert etc. */
39 #define FBSD_SWITCH_TAKES_ARG(CHAR) \
40 (DEFAULT_SWITCH_TAKES_ARG (CHAR) \
42 || (CHAR) == 'z' /* ignored by ld */ \
45 #undef SWITCH_TAKES_ARG
46 #define SWITCH_TAKES_ARG(CHAR) (FBSD_SWITCH_TAKES_ARG(CHAR))
48 /* This defines which multi-letter switches take arguments. */
50 #define FBSD_WORD_SWITCH_TAKES_ARG(STR) \
51 (DEFAULT_WORD_SWITCH_TAKES_ARG (STR) \
52 || !strcmp ((STR), "rpath") || !strcmp ((STR), "rpath-link") \
53 || !strcmp ((STR), "soname") || !strcmp ((STR), "defsym") \
54 || !strcmp ((STR), "assert") || !strcmp ((STR), "dynamic-linker"))
56 #undef WORD_SWITCH_TAKES_ARG
57 #define WORD_SWITCH_TAKES_ARG(STR) (FBSD_WORD_SWITCH_TAKES_ARG(STR))
59 /* Place spaces around this string. We depend on string splicing to produce
60 the final CPP_PREDEFINES value. */
62 #define FBSD_CPP_PREDEFINES \
63 " -D__FreeBSD__=4 -D__FreeBSD_cc_version=460001 -Dunix -Asystem(unix) -Asystem(FreeBSD) "
65 #define FBSD_CPP_SPEC " \
67 %{!maout: -D__ELF__} \
68 %{munderscores: -D__UNDERSCORES__} \
69 %{maout: %{!mno-underscores: -D__UNDERSCORES__}} \
70 %{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} \
71 %{posix:-D_POSIX_SOURCE}"
74 #define CPP_SPEC FBSD_CPP_SPEC
76 /* Provide a LIB_SPEC appropriate for FreeBSD. Before
77 __FreeBSD_version 500016, select the appropriate libc, depending on
78 whether we're doing profiling or need threads support. (similar to
79 the default, except no -lg, and no -p). At __FreeBSD_version
80 500016 and later, when threads support is requested include both
81 -lc and -lc_r instead of only -lc_r. */
84 #include <sys/param.h>
85 #if __FreeBSD_version >= 500016
88 %{!pg: %{pthread:-lc_r} -lc} \
89 %{pg: %{pthread:-lc_r_p} -lc_p} \
104 /************************[ Target stuff ]***********************************/
106 /* All FreeBSD Architectures support the ELF object file format. */
107 #undef OBJECT_FORMAT_ELF
108 #define OBJECT_FORMAT_ELF
110 /* Don't assume anything about the header files. */
111 #undef NO_IMPLICIT_EXTERN_C
112 #define NO_IMPLICIT_EXTERN_C
114 /* Implicit library calls should use memcpy, not bcopy, etc. */
115 #undef TARGET_MEM_FUNCTIONS
116 #define TARGET_MEM_FUNCTIONS
118 /* Allow #sccs in preprocessor. */
119 #undef SCCS_DIRECTIVE
120 #define SCCS_DIRECTIVE
125 /* Code generation parameters. */
127 /* Don't default to pcc-struct-return, because gcc is the only compiler, and
128 we want to retain compatibility with older gcc versions
129 (even though the SVR4 ABI for the i386 says that records and unions are
130 returned in memory). */
131 #undef DEFAULT_PCC_STRUCT_RETURN
132 #define DEFAULT_PCC_STRUCT_RETURN 0
134 /* Writing `int' for a bitfield forces int alignment for the structure. */
135 /* XXX: ok for Alpha?? */
136 #undef PCC_BITFIELD_TYPE_MATTERS
137 #define PCC_BITFIELD_TYPE_MATTERS 1
139 /* Use periods rather than dollar signs in special g++ assembler names.
140 This ensures the configuration knows our system correctly so we can link
141 with libraries compiled with the native cc. */
142 #undef NO_DOLLAR_IN_LABEL
144 /* The prefix to add to user-visible assembler symbols.
145 For System V Release 4 & ELF the convention is *not* to prepend a leading
146 underscore onto user-level symbol names. */
148 #undef USER_LABEL_PREFIX
149 #define USER_LABEL_PREFIX ""
151 /* Handle #pragma weak and #pragma pack. */
152 #undef HANDLE_SYSV_PRAGMA
153 #define HANDLE_SYSV_PRAGMA
155 /* While FreeBSD ELF no longer uses our home-grown crtbegin.o/crtend.o and thus
156 could switch to the DWARF2 unwinding mechanisms. I don't want to make the
157 switch mid-branch. So continue to use sjlj-exceptions. */
158 #ifdef WANT_DWARF2_UNWIND
159 /* FreeBSD ELF will use DWARF2 unwinding in 5.0+, as some psABI requires it. */
160 #define DWARF2_UNWIND_INFO 1
162 /* Maintain compatibility with the FreeBSD {3,4}.x C++ ABI. */
163 #define DWARF2_UNWIND_INFO 0
166 /* Do not use ``thunks'' to implement C++ vtables. This method still has
167 fatal bugs. Also, GCC 3.0 will have a new C++ ABI that may not even
169 #undef DEFAULT_VTABLE_THUNKS
172 /************************[ Assembler stuff ]********************************/
174 /* Override the default comment-starter of "/". */
175 #undef ASM_COMMENT_START
176 #define ASM_COMMENT_START "#"
178 /* Attach a special .ident directive to the end of the file to identify
179 the version of GCC which compiled this code. The format of the .ident
180 string is patterned after the ones produced by native SVR4 C compilers. */
183 #define IDENT_ASM_OP "\t.ident\t"
185 /* Output #ident as a .ident. */
187 #undef ASM_OUTPUT_IDENT
188 #define ASM_OUTPUT_IDENT(FILE, NAME) \
189 fprintf ((FILE), "%s\"%s\"\n", IDENT_ASM_OP, (NAME));
191 /* Identify the front-end which produced this file. To keep symbol
192 space down, and not confuse kdb, only do this if the language is
193 not C. (svr4.h defines ASM_IDENTIFY_GCC but neglects this) */
195 #undef ASM_IDENTIFY_LANGUAGE
196 #define ASM_IDENTIFY_LANGUAGE(FILE) \
198 if (strcmp (lang_identify (), "c") != 0) \
199 output_lang_identify (FILE); \
203 #define ASM_FILE_END(FILE) \
205 if (!flag_no_ident) \
206 fprintf ((FILE), "%s\"GCC: (GNU) %s %s\"\n", \
207 IDENT_ASM_OP, lang_identify(), version_string); \
210 /* This is the pseudo-op used to generate a contiguous sequence of byte
211 values from a double-quoted string WITHOUT HAVING A TERMINATING NUL
212 AUTOMATICALLY APPENDED. This is the same for most SVR4 assemblers. */
214 #undef ASCII_DATA_ASM_OP
215 #define ASCII_DATA_ASM_OP "\t.ascii\t"
218 #define ASM_BYTE_OP "\t.byte\t"
220 /* This is how to allocate empty space in some section. The .zero
221 pseudo-op is used for this on most ELF assemblers. */
224 #define SKIP_ASM_OP "\t.zero\t"
226 /* A table of bytes codes used by the ASM_OUTPUT_ASCII and
227 ASM_OUTPUT_LIMITED_STRING macros. Each byte in the table
228 corresponds to a particular byte value [0..255]. For any
229 given byte value, if the value in the corresponding table
230 position is zero, the given character can be output directly.
231 If the table value is 1, the byte must be output as a \ooo
232 octal escape. If the tables value is anything else, then the
233 byte value should be output as a \ followed by the value
234 in the table. Note that we can use standard UN*X escape
235 sequences for many control characters, but we don't use
236 \a to represent BEL because some SVR4 assemblers (e.g. on
237 the i386) don't know about that. Also, we don't use \v
238 since some versions of gas, such as 2.2 did not accept it. */
241 "\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\
242 \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\
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\1\
245 \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\
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"
250 /* Some SVR4 assemblers have a limit on the number of characters which
251 can appear in the operand of a .string directive. If your assembler
252 has such a limitation, you should define STRING_LIMIT to reflect that
253 limit. Note that at least some SVR4 assemblers have a limit on the
254 actual number of bytes in the double-quoted string, and that they
255 count each character in an escape sequence as one byte. Thus, an
256 escape sequence like \377 would count as four bytes.
258 If your target assembler doesn't support the .string directive, you
259 should define this to zero.
263 #define STRING_LIMIT ((unsigned) 256)
266 #define STRING_ASM_OP "\t.string\t"
268 /* Output the label which precedes a jumptable. Note that for all svr4/ELF
269 systems where we actually generate jumptables (which is to say every
270 SVR4 target except i386, where we use casesi instead) we put the jump-
271 tables into the .rodata section and since other stuff could have been
272 put into the .rodata section prior to any given jumptable, we have to
273 make sure that the location counter for the .rodata section gets pro-
274 perly re-aligned prior to the actual beginning of the jump table. */
277 #define ALIGN_ASM_OP "\t.align\t"
279 /* This says how to output assembler code to declare an
280 uninitialized external linkage data object. Under SVR4/ELF,
281 the linker seems to want the alignment of data objects
282 to depend on their types. We do exactly that here. */
285 #define COMMON_ASM_OP "\t.comm\t"
287 /* This says how to output assembler code to declare an
288 uninitialized internal linkage data object. Under SVR4/ELF,
289 the linker seems to want the alignment of data objects
290 to depend on their types. We do exactly that here. */
293 #define LOCAL_ASM_OP "\t.local\t"
295 #undef ASM_OUTPUT_BEFORE_CASE_LABEL
296 #define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE, PREFIX, NUM, TABLE) \
297 ASM_OUTPUT_ALIGN ((FILE), 2);
299 #undef ASM_OUTPUT_CASE_LABEL
300 #define ASM_OUTPUT_CASE_LABEL(FILE, PREFIX, NUM, JUMPTABLE) \
302 ASM_OUTPUT_BEFORE_CASE_LABEL ((FILE), (PREFIX), (NUM), (JUMPTABLE)) \
303 ASM_OUTPUT_INTERNAL_LABEL ((FILE), (PREFIX), (NUM)); \
306 /* The standard SVR4/ELF assembler seems to require that certain builtin
307 library routines (e.g. .udiv) be explicitly declared as .globl
308 in each assembly file where they are referenced. */
310 #undef ASM_OUTPUT_EXTERNAL_LIBCALL
311 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
312 ASM_GLOBALIZE_LABEL ((FILE), XSTR ((FUN), 0))
314 /* Support const sections and the ctors and dtors sections for g++.
315 Note that there appears to be two different ways to support const
316 sections at the moment. You can either #define the symbol
317 READONLY_DATA_SECTION (giving it some code which switches to the
318 readonly data section) or else you can #define the symbols
319 EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and
320 SELECT_RTX_SECTION. We do both here just to be on the safe side.
321 FreeBSD conditionalizes the use of ".section rodata" depending on
322 ELF mode - otherwise .text. */
324 #undef USE_CONST_SECTION
325 #define USE_CONST_SECTION TARGET_ELF
327 #undef CONST_SECTION_ASM_OP
328 #define CONST_SECTION_ASM_OP "\t.section\t.rodata"
330 /* Define the pseudo-ops used to switch to the .ctors and .dtors sections.
332 Note that we want to give these sections the SHF_WRITE attribute
333 because these sections will actually contain data (i.e. tables of
334 addresses of functions in the current root executable or shared library
335 file) and, in the case of a shared library, the relocatable addresses
336 will have to be properly resolved/relocated (and then written into) by
337 the dynamic linker when it actually attaches the given shared library
338 to the executing process. (Note that on SVR4, you may wish to use the
339 `-z text' option to the ELF linker, when building a shared library, as
340 an additional check that you are doing everything right. But if you do
341 use the `-z text' option when building a shared library, you will get
342 errors unless the .ctors and .dtors sections are marked as writable
343 via the SHF_WRITE attribute.) */
345 #undef CTORS_SECTION_ASM_OP
346 #define CTORS_SECTION_ASM_OP "\t.section\t.ctors,\"aw\""
347 #undef DTORS_SECTION_ASM_OP
348 #define DTORS_SECTION_ASM_OP "\t.section\t.dtors,\"aw\""
350 /* On SVR4, we *do* have support for the .init and .fini sections, and we
351 can put stuff in there to be executed before and after `main'. We let
352 crtstuff.c and other files know this by defining the following symbols.
353 The definitions say how to change sections to the .init and .fini
354 sections. This is the same for all known SVR4 assemblers. */
356 #undef INIT_SECTION_ASM_OP
357 #define INIT_SECTION_ASM_OP "\t.section\t.init"
358 #undef FINI_SECTION_ASM_OP
359 #define FINI_SECTION_ASM_OP "\t.section\t.fini"
361 /* A default list of other sections which we might be "in" at any given
362 time. For targets that use additional sections (e.g. .tdesc) you
363 should override this definition in the target-specific file which
364 includes this file. */
366 #undef EXTRA_SECTIONS
367 #define EXTRA_SECTIONS in_const, in_ctors, in_dtors
369 /* A default list of extra section function definitions. For targets
370 that use additional sections (e.g. .tdesc) you should override this
371 definition in the target-specific file which includes this file. */
373 #undef EXTRA_SECTION_FUNCTIONS
374 #define EXTRA_SECTION_FUNCTIONS \
375 CONST_SECTION_FUNCTION \
376 CTORS_SECTION_FUNCTION \
377 DTORS_SECTION_FUNCTION
379 #undef READONLY_DATA_SECTION
380 #define READONLY_DATA_SECTION() const_section ()
382 extern void text_section ();
384 #undef CONST_SECTION_FUNCTION
385 #define CONST_SECTION_FUNCTION \
389 if (!USE_CONST_SECTION) \
391 else if (in_section != in_const) \
393 fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP); \
394 in_section = in_const; \
398 #undef CTORS_SECTION_FUNCTION
399 #define CTORS_SECTION_FUNCTION \
403 if (in_section != in_ctors) \
405 fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP); \
406 in_section = in_ctors; \
410 #undef DTORS_SECTION_FUNCTION
411 #define DTORS_SECTION_FUNCTION \
415 if (in_section != in_dtors) \
417 fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP); \
418 in_section = in_dtors; \
422 /* A C statement or statements to switch to the appropriate
423 section for output of RTX in mode MODE. RTX is some kind
424 of constant in RTL. The argument MODE is redundant except
425 in the case of a `const_int' rtx. Currently, these always
426 go into the const section. */
428 #undef SELECT_RTX_SECTION
429 #define SELECT_RTX_SECTION(MODE, RTX) const_section()
431 /* Define the strings used for the special svr4/ELF .type and .size
432 directives. These strings generally do not vary from one svr4/ELF
433 system to another. */
436 #define TYPE_ASM_OP "\t.type\t"
438 #define SIZE_ASM_OP "\t.size\t"
440 /* This is how we tell the assembler that a symbol is weak. */
442 #undef ASM_WEAKEN_LABEL
443 #define ASM_WEAKEN_LABEL(FILE, NAME) \
445 fputs ("\t.globl\t", (FILE)); assemble_name ((FILE), (NAME)); \
446 fputc ('\n', (FILE)); \
447 fputs ("\t.weak\t", (FILE)); assemble_name ((FILE), (NAME)); \
448 fputc ('\n', (FILE)); \
451 /* The following macro defines the [default] format used with ELF to output
452 the second operand of the .type assembler directive. */
454 #undef TYPE_OPERAND_FMT
455 #define TYPE_OPERAND_FMT "@%s"
457 /* Write the extra assembler code needed to declare a function's result.
458 Most svr4/ELF assemblers don't require any special declaration of the
461 #undef ASM_DECLARE_RESULT
462 #define ASM_DECLARE_RESULT(FILE, RESULT)
464 /* These macros generate the special .type and .size directives which
465 are used to set the corresponding fields of the linker symbol table
466 entries in an ELF object file under SVR4/ELF. These macros also output
467 the starting labels for the relevant functions/objects. */
469 /* Write the extra assembler code needed to declare an object properly. */
471 #undef ASM_DECLARE_OBJECT_NAME
472 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
474 fprintf (FILE, "%s ", TYPE_ASM_OP); \
475 assemble_name (FILE, NAME); \
477 fprintf (FILE, TYPE_OPERAND_FMT, "object"); \
479 size_directive_output = 0; \
480 if (!flag_inhibit_size_directive && DECL_SIZE (DECL)) \
482 size_directive_output = 1; \
483 fprintf (FILE, "%s ", SIZE_ASM_OP); \
484 assemble_name (FILE, NAME); \
486 fprintf (FILE, HOST_WIDE_INT_PRINT_DEC, \
487 int_size_in_bytes (TREE_TYPE (DECL))); \
488 fputc ('\n', FILE); \
490 ASM_OUTPUT_LABEL(FILE, NAME); \
493 /* Output the size directive for a decl in rest_of_decl_compilation
494 in the case where we did not do so before the initializer.
495 Once we find the error_mark_node, we know that the value of
496 size_directive_output was set
497 by ASM_DECLARE_OBJECT_NAME when it was run for the same decl. */
499 #undef ASM_FINISH_DECLARE_OBJECT
500 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \
502 char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \
503 if (!flag_inhibit_size_directive && DECL_SIZE (DECL) \
504 && ! AT_END && TOP_LEVEL \
505 && DECL_INITIAL (DECL) == error_mark_node \
506 && !size_directive_output) \
508 size_directive_output = 1; \
509 fprintf (FILE, "%s ", SIZE_ASM_OP); \
510 assemble_name (FILE, name); \
512 fprintf (FILE, HOST_WIDE_INT_PRINT_DEC, \
513 int_size_in_bytes (TREE_TYPE (DECL))); \
514 fputc ('\n', FILE); \
519 /************************[ Debugger stuff ]*********************************/
521 /* All ELF targets can support DWARF-2. */
522 #undef DWARF2_DEBUGGING_INFO
523 #define DWARF2_DEBUGGING_INFO
525 /* This is BSD, so we want the DBX format. */
526 #undef DBX_DEBUGGING_INFO
527 #define DBX_DEBUGGING_INFO
529 /* This is BSD, so use stabs instead of DWARF debug format. */
530 #undef PREFERRED_DEBUGGING_TYPE
531 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
533 /* But allow STABS to be supported as well.
534 Note that we want to override some definition settings done for some
535 architecture's native OS's tools that don't apply to us. */
536 #undef ASM_IDENTIFY_GCC
537 #undef ASM_IDENTIFY_LANGUAGE