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 1.3 2003/08/08 04:11:06 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} \
73 %{pthread:-D_THREAD_SAFE}"
76 #define CPP_SPEC FBSD_CPP_SPEC
78 /* Provide a LIB_SPEC appropriate for FreeBSD. Before
79 __FreeBSD_version 500016, select the appropriate libc, depending on
80 whether we're doing profiling or need threads support. (similar to
81 the default, except no -lg, and no -p). At __FreeBSD_version
82 500016 and later, when threads support is requested include both
83 -lc and -lc_r instead of only -lc_r. */
86 #include <sys/param.h>
87 #if __FreeBSD_version >= 500016
90 %{!pg: %{pthread:-lc_r} -lc} \
91 %{pg: %{pthread:-lc_r_p} -lc_p} \
101 %{pthread:-lc_r_p}} \
106 /************************[ Target stuff ]***********************************/
108 /* All FreeBSD Architectures support the ELF object file format. */
109 #undef OBJECT_FORMAT_ELF
110 #define OBJECT_FORMAT_ELF
112 /* Don't assume anything about the header files. */
113 #undef NO_IMPLICIT_EXTERN_C
114 #define NO_IMPLICIT_EXTERN_C
116 /* Implicit library calls should use memcpy, not bcopy, etc. */
117 #undef TARGET_MEM_FUNCTIONS
118 #define TARGET_MEM_FUNCTIONS
120 /* Allow #sccs in preprocessor. */
121 #undef SCCS_DIRECTIVE
122 #define SCCS_DIRECTIVE
127 /* Code generation parameters. */
129 /* Don't default to pcc-struct-return, because gcc is the only compiler, and
130 we want to retain compatibility with older gcc versions
131 (even though the SVR4 ABI for the i386 says that records and unions are
132 returned in memory). */
133 #undef DEFAULT_PCC_STRUCT_RETURN
134 #define DEFAULT_PCC_STRUCT_RETURN 0
136 /* Writing `int' for a bitfield forces int alignment for the structure. */
137 /* XXX: ok for Alpha?? */
138 #undef PCC_BITFIELD_TYPE_MATTERS
139 #define PCC_BITFIELD_TYPE_MATTERS 1
141 /* Use periods rather than dollar signs in special g++ assembler names.
142 This ensures the configuration knows our system correctly so we can link
143 with libraries compiled with the native cc. */
144 #undef NO_DOLLAR_IN_LABEL
146 /* The prefix to add to user-visible assembler symbols.
147 For System V Release 4 & ELF the convention is *not* to prepend a leading
148 underscore onto user-level symbol names. */
150 #undef USER_LABEL_PREFIX
151 #define USER_LABEL_PREFIX ""
153 /* Handle #pragma weak and #pragma pack. */
154 #undef HANDLE_SYSV_PRAGMA
155 #define HANDLE_SYSV_PRAGMA
157 /* While FreeBSD ELF no longer uses our home-grown crtbegin.o/crtend.o and thus
158 could switch to the DWARF2 unwinding mechanisms. I don't want to make the
159 switch mid-branch. So continue to use sjlj-exceptions. */
160 #ifdef WANT_DWARF2_UNWIND
161 /* FreeBSD ELF will use DWARF2 unwinding in 5.0+, as some psABI requires it. */
162 #define DWARF2_UNWIND_INFO 1
164 /* Maintain compatibility with the FreeBSD {3,4}.x C++ ABI. */
165 #define DWARF2_UNWIND_INFO 0
168 /* Do not use ``thunks'' to implement C++ vtables. This method still has
169 fatal bugs. Also, GCC 3.0 will have a new C++ ABI that may not even
171 #undef DEFAULT_VTABLE_THUNKS
174 /************************[ Assembler stuff ]********************************/
176 /* Override the default comment-starter of "/". */
177 #undef ASM_COMMENT_START
178 #define ASM_COMMENT_START "#"
180 /* Attach a special .ident directive to the end of the file to identify
181 the version of GCC which compiled this code. The format of the .ident
182 string is patterned after the ones produced by native SVR4 C compilers. */
185 #define IDENT_ASM_OP "\t.ident\t"
187 /* Output #ident as a .ident. */
189 #undef ASM_OUTPUT_IDENT
190 #define ASM_OUTPUT_IDENT(FILE, NAME) \
191 fprintf ((FILE), "%s\"%s\"\n", IDENT_ASM_OP, (NAME));
193 /* Identify the front-end which produced this file. To keep symbol
194 space down, and not confuse kdb, only do this if the language is
195 not C. (svr4.h defines ASM_IDENTIFY_GCC but neglects this) */
197 #undef ASM_IDENTIFY_LANGUAGE
198 #define ASM_IDENTIFY_LANGUAGE(FILE) \
200 if (strcmp (lang_identify (), "c") != 0) \
201 output_lang_identify (FILE); \
205 #define ASM_FILE_END(FILE) \
207 if (!flag_no_ident) \
208 fprintf ((FILE), "%s\"GCC: (GNU) %s %s\"\n", \
209 IDENT_ASM_OP, lang_identify(), version_string); \
212 /* This is the pseudo-op used to generate a contiguous sequence of byte
213 values from a double-quoted string WITHOUT HAVING A TERMINATING NUL
214 AUTOMATICALLY APPENDED. This is the same for most SVR4 assemblers. */
216 #undef ASCII_DATA_ASM_OP
217 #define ASCII_DATA_ASM_OP "\t.ascii\t"
220 #define ASM_BYTE_OP "\t.byte\t"
222 /* This is how to allocate empty space in some section. The .zero
223 pseudo-op is used for this on most ELF assemblers. */
226 #define SKIP_ASM_OP "\t.zero\t"
228 /* A table of bytes codes used by the ASM_OUTPUT_ASCII and
229 ASM_OUTPUT_LIMITED_STRING macros. Each byte in the table
230 corresponds to a particular byte value [0..255]. For any
231 given byte value, if the value in the corresponding table
232 position is zero, the given character can be output directly.
233 If the table value is 1, the byte must be output as a \ooo
234 octal escape. If the tables value is anything else, then the
235 byte value should be output as a \ followed by the value
236 in the table. Note that we can use standard UN*X escape
237 sequences for many control characters, but we don't use
238 \a to represent BEL because some SVR4 assemblers (e.g. on
239 the i386) don't know about that. Also, we don't use \v
240 since some versions of gas, such as 2.2 did not accept it. */
243 "\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\
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\
246 \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\
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\
250 \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"
252 /* Some SVR4 assemblers have a limit on the number of characters which
253 can appear in the operand of a .string directive. If your assembler
254 has such a limitation, you should define STRING_LIMIT to reflect that
255 limit. Note that at least some SVR4 assemblers have a limit on the
256 actual number of bytes in the double-quoted string, and that they
257 count each character in an escape sequence as one byte. Thus, an
258 escape sequence like \377 would count as four bytes.
260 If your target assembler doesn't support the .string directive, you
261 should define this to zero.
265 #define STRING_LIMIT ((unsigned) 256)
268 #define STRING_ASM_OP "\t.string\t"
270 /* Output the label which precedes a jumptable. Note that for all svr4/ELF
271 systems where we actually generate jumptables (which is to say every
272 SVR4 target except i386, where we use casesi instead) we put the jump-
273 tables into the .rodata section and since other stuff could have been
274 put into the .rodata section prior to any given jumptable, we have to
275 make sure that the location counter for the .rodata section gets pro-
276 perly re-aligned prior to the actual beginning of the jump table. */
279 #define ALIGN_ASM_OP "\t.align\t"
281 /* This says how to output assembler code to declare an
282 uninitialized external linkage data object. Under SVR4/ELF,
283 the linker seems to want the alignment of data objects
284 to depend on their types. We do exactly that here. */
287 #define COMMON_ASM_OP "\t.comm\t"
289 /* This says how to output assembler code to declare an
290 uninitialized internal linkage data object. Under SVR4/ELF,
291 the linker seems to want the alignment of data objects
292 to depend on their types. We do exactly that here. */
295 #define LOCAL_ASM_OP "\t.local\t"
297 #undef ASM_OUTPUT_BEFORE_CASE_LABEL
298 #define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE, PREFIX, NUM, TABLE) \
299 ASM_OUTPUT_ALIGN ((FILE), 2);
301 #undef ASM_OUTPUT_CASE_LABEL
302 #define ASM_OUTPUT_CASE_LABEL(FILE, PREFIX, NUM, JUMPTABLE) \
304 ASM_OUTPUT_BEFORE_CASE_LABEL ((FILE), (PREFIX), (NUM), (JUMPTABLE)) \
305 ASM_OUTPUT_INTERNAL_LABEL ((FILE), (PREFIX), (NUM)); \
308 /* The standard SVR4/ELF assembler seems to require that certain builtin
309 library routines (e.g. .udiv) be explicitly declared as .globl
310 in each assembly file where they are referenced. */
312 #undef ASM_OUTPUT_EXTERNAL_LIBCALL
313 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
314 ASM_GLOBALIZE_LABEL ((FILE), XSTR ((FUN), 0))
316 /* Support const sections and the ctors and dtors sections for g++.
317 Note that there appears to be two different ways to support const
318 sections at the moment. You can either #define the symbol
319 READONLY_DATA_SECTION (giving it some code which switches to the
320 readonly data section) or else you can #define the symbols
321 EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and
322 SELECT_RTX_SECTION. We do both here just to be on the safe side.
323 FreeBSD conditionalizes the use of ".section rodata" depending on
324 ELF mode - otherwise .text. */
326 #undef USE_CONST_SECTION
327 #define USE_CONST_SECTION TARGET_ELF
329 #undef CONST_SECTION_ASM_OP
330 #define CONST_SECTION_ASM_OP "\t.section\t.rodata"
332 /* Define the pseudo-ops used to switch to the .ctors and .dtors sections.
334 Note that we want to give these sections the SHF_WRITE attribute
335 because these sections will actually contain data (i.e. tables of
336 addresses of functions in the current root executable or shared library
337 file) and, in the case of a shared library, the relocatable addresses
338 will have to be properly resolved/relocated (and then written into) by
339 the dynamic linker when it actually attaches the given shared library
340 to the executing process. (Note that on SVR4, you may wish to use the
341 `-z text' option to the ELF linker, when building a shared library, as
342 an additional check that you are doing everything right. But if you do
343 use the `-z text' option when building a shared library, you will get
344 errors unless the .ctors and .dtors sections are marked as writable
345 via the SHF_WRITE attribute.) */
347 #undef CTORS_SECTION_ASM_OP
348 #define CTORS_SECTION_ASM_OP "\t.section\t.ctors,\"aw\""
349 #undef DTORS_SECTION_ASM_OP
350 #define DTORS_SECTION_ASM_OP "\t.section\t.dtors,\"aw\""
352 /* On SVR4, we *do* have support for the .init and .fini sections, and we
353 can put stuff in there to be executed before and after `main'. We let
354 crtstuff.c and other files know this by defining the following symbols.
355 The definitions say how to change sections to the .init and .fini
356 sections. This is the same for all known SVR4 assemblers. */
358 #undef INIT_SECTION_ASM_OP
359 #define INIT_SECTION_ASM_OP "\t.section\t.init"
360 #undef FINI_SECTION_ASM_OP
361 #define FINI_SECTION_ASM_OP "\t.section\t.fini"
363 /* A default list of other sections which we might be "in" at any given
364 time. For targets that use additional sections (e.g. .tdesc) you
365 should override this definition in the target-specific file which
366 includes this file. */
368 #undef EXTRA_SECTIONS
369 #define EXTRA_SECTIONS in_const, in_ctors, in_dtors
371 /* A default list of extra section function definitions. For targets
372 that use additional sections (e.g. .tdesc) you should override this
373 definition in the target-specific file which includes this file. */
375 #undef EXTRA_SECTION_FUNCTIONS
376 #define EXTRA_SECTION_FUNCTIONS \
377 CONST_SECTION_FUNCTION \
378 CTORS_SECTION_FUNCTION \
379 DTORS_SECTION_FUNCTION
381 #undef READONLY_DATA_SECTION
382 #define READONLY_DATA_SECTION() const_section ()
384 extern void text_section ();
386 #undef CONST_SECTION_FUNCTION
387 #define CONST_SECTION_FUNCTION \
391 if (!USE_CONST_SECTION) \
393 else if (in_section != in_const) \
395 fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP); \
396 in_section = in_const; \
400 #undef CTORS_SECTION_FUNCTION
401 #define CTORS_SECTION_FUNCTION \
405 if (in_section != in_ctors) \
407 fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP); \
408 in_section = in_ctors; \
412 #undef DTORS_SECTION_FUNCTION
413 #define DTORS_SECTION_FUNCTION \
417 if (in_section != in_dtors) \
419 fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP); \
420 in_section = in_dtors; \
424 /* A C statement or statements to switch to the appropriate
425 section for output of RTX in mode MODE. RTX is some kind
426 of constant in RTL. The argument MODE is redundant except
427 in the case of a `const_int' rtx. Currently, these always
428 go into the const section. */
430 #undef SELECT_RTX_SECTION
431 #define SELECT_RTX_SECTION(MODE, RTX) const_section()
433 /* Define the strings used for the special svr4/ELF .type and .size
434 directives. These strings generally do not vary from one svr4/ELF
435 system to another. */
438 #define TYPE_ASM_OP "\t.type\t"
440 #define SIZE_ASM_OP "\t.size\t"
442 /* This is how we tell the assembler that a symbol is weak. */
444 #undef ASM_WEAKEN_LABEL
445 #define ASM_WEAKEN_LABEL(FILE, NAME) \
447 fputs ("\t.globl\t", (FILE)); assemble_name ((FILE), (NAME)); \
448 fputc ('\n', (FILE)); \
449 fputs ("\t.weak\t", (FILE)); assemble_name ((FILE), (NAME)); \
450 fputc ('\n', (FILE)); \
453 /* The following macro defines the [default] format used with ELF to output
454 the second operand of the .type assembler directive. */
456 #undef TYPE_OPERAND_FMT
457 #define TYPE_OPERAND_FMT "@%s"
459 /* Write the extra assembler code needed to declare a function's result.
460 Most svr4/ELF assemblers don't require any special declaration of the
463 #undef ASM_DECLARE_RESULT
464 #define ASM_DECLARE_RESULT(FILE, RESULT)
466 /* These macros generate the special .type and .size directives which
467 are used to set the corresponding fields of the linker symbol table
468 entries in an ELF object file under SVR4/ELF. These macros also output
469 the starting labels for the relevant functions/objects. */
471 /* Write the extra assembler code needed to declare an object properly. */
473 #undef ASM_DECLARE_OBJECT_NAME
474 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
476 fprintf (FILE, "%s ", TYPE_ASM_OP); \
477 assemble_name (FILE, NAME); \
479 fprintf (FILE, TYPE_OPERAND_FMT, "object"); \
481 size_directive_output = 0; \
482 if (!flag_inhibit_size_directive && DECL_SIZE (DECL)) \
484 size_directive_output = 1; \
485 fprintf (FILE, "%s ", SIZE_ASM_OP); \
486 assemble_name (FILE, NAME); \
488 fprintf (FILE, HOST_WIDE_INT_PRINT_DEC, \
489 int_size_in_bytes (TREE_TYPE (DECL))); \
490 fputc ('\n', FILE); \
492 ASM_OUTPUT_LABEL(FILE, NAME); \
495 /* Output the size directive for a decl in rest_of_decl_compilation
496 in the case where we did not do so before the initializer.
497 Once we find the error_mark_node, we know that the value of
498 size_directive_output was set
499 by ASM_DECLARE_OBJECT_NAME when it was run for the same decl. */
501 #undef ASM_FINISH_DECLARE_OBJECT
502 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \
504 char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \
505 if (!flag_inhibit_size_directive && DECL_SIZE (DECL) \
506 && ! AT_END && TOP_LEVEL \
507 && DECL_INITIAL (DECL) == error_mark_node \
508 && !size_directive_output) \
510 size_directive_output = 1; \
511 fprintf (FILE, "%s ", SIZE_ASM_OP); \
512 assemble_name (FILE, name); \
514 fprintf (FILE, HOST_WIDE_INT_PRINT_DEC, \
515 int_size_in_bytes (TREE_TYPE (DECL))); \
516 fputc ('\n', FILE); \
521 /************************[ Debugger stuff ]*********************************/
523 /* All ELF targets can support DWARF-2. */
524 #undef DWARF2_DEBUGGING_INFO
525 #define DWARF2_DEBUGGING_INFO
527 /* This is BSD, so we want the DBX format. */
528 #undef DBX_DEBUGGING_INFO
529 #define DBX_DEBUGGING_INFO
531 /* This is BSD, so use stabs instead of DWARF debug format. */
532 #undef PREFERRED_DEBUGGING_TYPE
533 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
535 /* But allow STABS to be supported as well.
536 Note that we want to override some definition settings done for some
537 architecture's native OS's tools that don't apply to us. */
538 #undef ASM_IDENTIFY_GCC
539 #undef ASM_IDENTIFY_LANGUAGE