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freebsd-dev/contrib/gcc/config/freebsd.h
David E. O'Brien cb300ebf8e Make it easy for people to use define DWARF2 exceptions unwinding. 
If "WANT_DWARF2_UNWIND" you get it.  Note that this is a different C++ ABI
than the FreeBSD default.  So you will need to recompile all your C++ apps
that uses exceptions if you turn this on.  I am adding it here for Yahoo!'s
use and for those that want to be early adopters to what I will make as the
default with the GCC 3.0 import.
2001-05-14 22:45:26 +00:00

536 lines
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/* Base configuration file for all FreeBSD targets.
Copyright (C) 1999, 2000 Free Software Foundation, Inc.
This file is part of GNU CC.
GNU CC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU CC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING. If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/* Common FreeBSD configuration.
All FreeBSD architectures should include this file, which will specify
their commonalities.
Adapted from /usr/src/contrib/gcc/config/i386/freebsd.h,
/usr/src/contrib/gcc/config/svr4.h &
egcs/gcc/config/i386/freebsd-elf.h by
David O'Brien <obrien@FreeBSD.org>. */
/* $FreeBSD$ */
/* Cpp, assembler, linker, library, and startfile spec's. */
/* This defines which switch letters take arguments. On FreeBSD, most of
the normal cases (defined in gcc.c) apply, and we also have -h* and
-z* options (for the linker) (coming from SVR4).
We also have -R (alias --rpath), no -z, --soname (-h), --assert etc. */
#define FBSD_SWITCH_TAKES_ARG(CHAR) \
(DEFAULT_SWITCH_TAKES_ARG (CHAR) \
|| (CHAR) == 'h' \
|| (CHAR) == 'z' /* ignored by ld */ \
|| (CHAR) == 'R')
#undef SWITCH_TAKES_ARG
#define SWITCH_TAKES_ARG(CHAR) (FBSD_SWITCH_TAKES_ARG(CHAR))
/* This defines which multi-letter switches take arguments. */
#define FBSD_WORD_SWITCH_TAKES_ARG(STR) \
(DEFAULT_WORD_SWITCH_TAKES_ARG (STR) \
|| !strcmp ((STR), "rpath") || !strcmp ((STR), "rpath-link") \
|| !strcmp ((STR), "soname") || !strcmp ((STR), "defsym") \
|| !strcmp ((STR), "assert") || !strcmp ((STR), "dynamic-linker"))
#undef WORD_SWITCH_TAKES_ARG
#define WORD_SWITCH_TAKES_ARG(STR) (FBSD_WORD_SWITCH_TAKES_ARG(STR))
/* Place spaces around this string. We depend on string splicing to produce
the final CPP_PREDEFINES value. */
#define FBSD_CPP_PREDEFINES \
" -D__FreeBSD__=5 -D__FreeBSD_cc_version=500002 -Dunix -Asystem(unix) -Asystem(FreeBSD) "
#define FBSD_CPP_SPEC " \
%(cpp_cpu) \
%{!maout: -D__ELF__} \
%{munderscores: -D__UNDERSCORES__} \
%{maout: %{!mno-underscores: -D__UNDERSCORES__}} \
%{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} \
%{posix:-D_POSIX_SOURCE}"
#undef CPP_SPEC
#define CPP_SPEC FBSD_CPP_SPEC
/* Provide a LIB_SPEC appropriate for FreeBSD. Before
__FreeBSD_version 500016, select the appropriate libc, depending on
whether we're doing profiling or need threads support. (similar to
the default, except no -lg, and no -p). At __FreeBSD_version
500016 and later, when threads support is requested include both
-lc and -lc_r instead of only -lc_r. */
#undef LIB_SPEC
#include <sys/param.h>
#if __FreeBSD_version >= 500016
#define LIB_SPEC " \
%{!shared: \
%{!pg: %{pthread:-lc_r} -lc} \
%{pg: %{pthread:-lc_r_p} -lc_p} \
}"
#else
#define LIB_SPEC " \
%{!shared: \
%{!pg: \
%{!pthread:-lc} \
%{pthread:-lc_r}} \
%{pg: \
%{!pthread:-lc_p} \
%{pthread:-lc_r_p}} \
}"
#endif
/************************[ Target stuff ]***********************************/
/* All FreeBSD Architectures support the ELF object file format. */
#undef OBJECT_FORMAT_ELF
#define OBJECT_FORMAT_ELF
/* Don't assume anything about the header files. */
#undef NO_IMPLICIT_EXTERN_C
#define NO_IMPLICIT_EXTERN_C
/* Implicit library calls should use memcpy, not bcopy, etc. */
#undef TARGET_MEM_FUNCTIONS
#define TARGET_MEM_FUNCTIONS
/* Allow #sccs in preprocessor. */
#undef SCCS_DIRECTIVE
#define SCCS_DIRECTIVE
#undef HAVE_ATEXIT
#define HAVE_ATEXIT
/* Code generation parameters. */
/* Don't default to pcc-struct-return, because gcc is the only compiler, and
we want to retain compatibility with older gcc versions
(even though the SVR4 ABI for the i386 says that records and unions are
returned in memory). */
#undef DEFAULT_PCC_STRUCT_RETURN
#define DEFAULT_PCC_STRUCT_RETURN 0
/* Writing `int' for a bitfield forces int alignment for the structure. */
/* XXX: ok for Alpha?? */
#undef PCC_BITFIELD_TYPE_MATTERS
#define PCC_BITFIELD_TYPE_MATTERS 1
/* Use periods rather than dollar signs in special g++ assembler names.
This ensures the configuration knows our system correctly so we can link
with libraries compiled with the native cc. */
#undef NO_DOLLAR_IN_LABEL
/* The prefix to add to user-visible assembler symbols.
For System V Release 4 & ELF the convention is *not* to prepend a leading
underscore onto user-level symbol names. */
#undef USER_LABEL_PREFIX
#define USER_LABEL_PREFIX ""
/* Handle #pragma weak and #pragma pack. */
#undef HANDLE_SYSV_PRAGMA
#define HANDLE_SYSV_PRAGMA
#ifdef WANT_DWARF2_UNWIND
/* FreeBSD ELF uses across the board will now use DWARF2 unwinding as the IA-64
psABI requires it. */
#define DWARF2_UNWIND_INFO 1
#else
/* Maintain compatibility with the FreeBSD {3,4}.x C++ ABI. */
#define DWARF2_UNWIND_INFO 0
#endif
/* Do not use ``thunks'' to implement C++ vtables. This method still has
fatal bugs. Also, GCC 3.0 will have a new C++ ABI that may not even
support `thunks'. */
#undef DEFAULT_VTABLE_THUNKS
/************************[ Assembler stuff ]********************************/
/* Override the default comment-starter of "/". */
#undef ASM_COMMENT_START
#define ASM_COMMENT_START "#"
/* Attach a special .ident directive to the end of the file to identify
the version of GCC which compiled this code. The format of the .ident
string is patterned after the ones produced by native SVR4 C compilers. */
#undef IDENT_ASM_OP
#define IDENT_ASM_OP "\t.ident\t"
/* Output #ident as a .ident. */
#undef ASM_OUTPUT_IDENT
#define ASM_OUTPUT_IDENT(FILE, NAME) \
fprintf ((FILE), "%s\"%s\"\n", IDENT_ASM_OP, (NAME));
/* Identify the front-end which produced this file. To keep symbol
space down, and not confuse kdb, only do this if the language is
not C. (svr4.h defines ASM_IDENTIFY_GCC but neglects this) */
#undef ASM_IDENTIFY_LANGUAGE
#define ASM_IDENTIFY_LANGUAGE(FILE) \
{ \
if (strcmp (lang_identify (), "c") != 0) \
output_lang_identify (FILE); \
}
#undef ASM_FILE_END
#define ASM_FILE_END(FILE) \
do { \
if (!flag_no_ident) \
fprintf ((FILE), "%s\"[ASM_FILE_END]GCC: (%s) %s\"\n", \
IDENT_ASM_OP, lang_identify(), version_string); \
} while (0)
/* This is the pseudo-op used to generate a contiguous sequence of byte
values from a double-quoted string WITHOUT HAVING A TERMINATING NUL
AUTOMATICALLY APPENDED. This is the same for most SVR4 assemblers. */
#undef ASCII_DATA_ASM_OP
#define ASCII_DATA_ASM_OP "\t.ascii\t"
#undef ASM_BYTE_OP
#define ASM_BYTE_OP "\t.byte\t"
/* This is how to allocate empty space in some section. The .zero
pseudo-op is used for this on most ELF assemblers. */
#undef SKIP_ASM_OP
#define SKIP_ASM_OP "\t.zero\t"
/* A table of bytes codes used by the ASM_OUTPUT_ASCII and
ASM_OUTPUT_LIMITED_STRING macros. Each byte in the table
corresponds to a particular byte value [0..255]. For any
given byte value, if the value in the corresponding table
position is zero, the given character can be output directly.
If the table value is 1, the byte must be output as a \ooo
octal escape. If the tables value is anything else, then the
byte value should be output as a \ followed by the value
in the table. Note that we can use standard UN*X escape
sequences for many control characters, but we don't use
\a to represent BEL because some SVR4 assemblers (e.g. on
the i386) don't know about that. Also, we don't use \v
since some versions of gas, such as 2.2 did not accept it. */
#define ESCAPES \
"\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\
\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\
\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\
\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\
\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\
\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\
\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\
\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"
/* Some SVR4 assemblers have a limit on the number of characters which
can appear in the operand of a .string directive. If your assembler
has such a limitation, you should define STRING_LIMIT to reflect that
limit. Note that at least some SVR4 assemblers have a limit on the
actual number of bytes in the double-quoted string, and that they
count each character in an escape sequence as one byte. Thus, an
escape sequence like \377 would count as four bytes.
If your target assembler doesn't support the .string directive, you
should define this to zero.
*/
#undef STRING_LIMIT
#define STRING_LIMIT ((unsigned) 256)
#undef STRING_ASM_OP
#define STRING_ASM_OP "\t.string\t"
/* Output the label which precedes a jumptable. Note that for all svr4/ELF
systems where we actually generate jumptables (which is to say every
SVR4 target except i386, where we use casesi instead) we put the jump-
tables into the .rodata section and since other stuff could have been
put into the .rodata section prior to any given jumptable, we have to
make sure that the location counter for the .rodata section gets pro-
perly re-aligned prior to the actual beginning of the jump table. */
#undef ALIGN_ASM_OP
#define ALIGN_ASM_OP "\t.align\t"
/* This says how to output assembler code to declare an
uninitialized external linkage data object. Under SVR4/ELF,
the linker seems to want the alignment of data objects
to depend on their types. We do exactly that here. */
#undef COMMON_ASM_OP
#define COMMON_ASM_OP "\t.comm\t"
/* This says how to output assembler code to declare an
uninitialized internal linkage data object. Under SVR4/ELF,
the linker seems to want the alignment of data objects
to depend on their types. We do exactly that here. */
#undef LOCAL_ASM_OP
#define LOCAL_ASM_OP "\t.local\t"
#undef ASM_OUTPUT_BEFORE_CASE_LABEL
#define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE, PREFIX, NUM, TABLE) \
ASM_OUTPUT_ALIGN ((FILE), 2);
#undef ASM_OUTPUT_CASE_LABEL
#define ASM_OUTPUT_CASE_LABEL(FILE, PREFIX, NUM, JUMPTABLE) \
do { \
ASM_OUTPUT_BEFORE_CASE_LABEL ((FILE), (PREFIX), (NUM), (JUMPTABLE)) \
ASM_OUTPUT_INTERNAL_LABEL ((FILE), (PREFIX), (NUM)); \
} while (0)
/* The standard SVR4/ELF assembler seems to require that certain builtin
library routines (e.g. .udiv) be explicitly declared as .globl
in each assembly file where they are referenced. */
#undef ASM_OUTPUT_EXTERNAL_LIBCALL
#define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
ASM_GLOBALIZE_LABEL ((FILE), XSTR ((FUN), 0))
/* Support const sections and the ctors and dtors sections for g++.
Note that there appears to be two different ways to support const
sections at the moment. You can either #define the symbol
READONLY_DATA_SECTION (giving it some code which switches to the
readonly data section) or else you can #define the symbols
EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and
SELECT_RTX_SECTION. We do both here just to be on the safe side.
FreeBSD conditionalizes the use of ".section rodata" depending on
ELF mode - otherwise .text. */
#undef USE_CONST_SECTION
#define USE_CONST_SECTION TARGET_ELF
#undef CONST_SECTION_ASM_OP
#define CONST_SECTION_ASM_OP "\t.section\t.rodata"
/* Define the pseudo-ops used to switch to the .ctors and .dtors sections.
Note that we want to give these sections the SHF_WRITE attribute
because these sections will actually contain data (i.e. tables of
addresses of functions in the current root executable or shared library
file) and, in the case of a shared library, the relocatable addresses
will have to be properly resolved/relocated (and then written into) by
the dynamic linker when it actually attaches the given shared library
to the executing process. (Note that on SVR4, you may wish to use the
`-z text' option to the ELF linker, when building a shared library, as
an additional check that you are doing everything right. But if you do
use the `-z text' option when building a shared library, you will get
errors unless the .ctors and .dtors sections are marked as writable
via the SHF_WRITE attribute.) */
#undef CTORS_SECTION_ASM_OP
#define CTORS_SECTION_ASM_OP "\t.section\t.ctors,\"aw\""
#undef DTORS_SECTION_ASM_OP
#define DTORS_SECTION_ASM_OP "\t.section\t.dtors,\"aw\""
/* On SVR4, we *do* have support for the .init and .fini sections, and we
can put stuff in there to be executed before and after `main'. We let
crtstuff.c and other files know this by defining the following symbols.
The definitions say how to change sections to the .init and .fini
sections. This is the same for all known SVR4 assemblers. */
#undef INIT_SECTION_ASM_OP
#define INIT_SECTION_ASM_OP "\t.section\t.init"
#undef FINI_SECTION_ASM_OP
#define FINI_SECTION_ASM_OP "\t.section\t.fini"
/* A default list of other sections which we might be "in" at any given
time. For targets that use additional sections (e.g. .tdesc) you
should override this definition in the target-specific file which
includes this file. */
#undef EXTRA_SECTIONS
#define EXTRA_SECTIONS in_const, in_ctors, in_dtors
/* A default list of extra section function definitions. For targets
that use additional sections (e.g. .tdesc) you should override this
definition in the target-specific file which includes this file. */
#undef EXTRA_SECTION_FUNCTIONS
#define EXTRA_SECTION_FUNCTIONS \
CONST_SECTION_FUNCTION \
CTORS_SECTION_FUNCTION \
DTORS_SECTION_FUNCTION
#undef READONLY_DATA_SECTION
#define READONLY_DATA_SECTION() const_section ()
extern void text_section ();
#undef CONST_SECTION_FUNCTION
#define CONST_SECTION_FUNCTION \
void \
const_section () \
{ \
if (!USE_CONST_SECTION) \
text_section(); \
else if (in_section != in_const) \
{ \
fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP); \
in_section = in_const; \
} \
}
#undef CTORS_SECTION_FUNCTION
#define CTORS_SECTION_FUNCTION \
void \
ctors_section () \
{ \
if (in_section != in_ctors) \
{ \
fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP); \
in_section = in_ctors; \
} \
}
#undef DTORS_SECTION_FUNCTION
#define DTORS_SECTION_FUNCTION \
void \
dtors_section () \
{ \
if (in_section != in_dtors) \
{ \
fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP); \
in_section = in_dtors; \
} \
}
/* A C statement or statements to switch to the appropriate
section for output of RTX in mode MODE. RTX is some kind
of constant in RTL. The argument MODE is redundant except
in the case of a `const_int' rtx. Currently, these always
go into the const section. */
#undef SELECT_RTX_SECTION
#define SELECT_RTX_SECTION(MODE, RTX) const_section()
/* Define the strings used for the special svr4/ELF .type and .size
directives. These strings generally do not vary from one svr4/ELF
system to another. */
#undef TYPE_ASM_OP
#define TYPE_ASM_OP "\t.type\t"
#undef SIZE_ASM_OP
#define SIZE_ASM_OP "\t.size\t"
/* This is how we tell the assembler that a symbol is weak. */
#undef ASM_WEAKEN_LABEL
#define ASM_WEAKEN_LABEL(FILE, NAME) \
do { \
fputs ("\t.globl\t", (FILE)); assemble_name ((FILE), (NAME)); \
fputc ('\n', (FILE)); \
fputs ("\t.weak\t", (FILE)); assemble_name ((FILE), (NAME)); \
fputc ('\n', (FILE)); \
} while (0)
/* The following macro defines the [default] format used with ELF to output
the second operand of the .type assembler directive. */
#undef TYPE_OPERAND_FMT
#define TYPE_OPERAND_FMT "@%s"
/* Write the extra assembler code needed to declare a function's result.
Most svr4/ELF assemblers don't require any special declaration of the
result value. */
#undef ASM_DECLARE_RESULT
#define ASM_DECLARE_RESULT(FILE, RESULT)
/* These macros generate the special .type and .size directives which
are used to set the corresponding fields of the linker symbol table
entries in an ELF object file under SVR4/ELF. These macros also output
the starting labels for the relevant functions/objects. */
/* Write the extra assembler code needed to declare an object properly. */
#undef ASM_DECLARE_OBJECT_NAME
#define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
do { \
fprintf (FILE, "%s ", TYPE_ASM_OP); \
assemble_name (FILE, NAME); \
putc (',', FILE); \
fprintf (FILE, TYPE_OPERAND_FMT, "object"); \
putc ('\n', FILE); \
size_directive_output = 0; \
if (!flag_inhibit_size_directive && DECL_SIZE (DECL)) \
{ \
size_directive_output = 1; \
fprintf (FILE, "%s ", SIZE_ASM_OP); \
assemble_name (FILE, NAME); \
putc (',', FILE); \
fprintf (FILE, HOST_WIDE_INT_PRINT_DEC, \
int_size_in_bytes (TREE_TYPE (DECL))); \
fputc ('\n', FILE); \
} \
ASM_OUTPUT_LABEL(FILE, NAME); \
} while (0)
/* Output the size directive for a decl in rest_of_decl_compilation
in the case where we did not do so before the initializer.
Once we find the error_mark_node, we know that the value of
size_directive_output was set
by ASM_DECLARE_OBJECT_NAME when it was run for the same decl. */
#undef ASM_FINISH_DECLARE_OBJECT
#define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \
do { \
char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \
if (!flag_inhibit_size_directive && DECL_SIZE (DECL) \
&& ! AT_END && TOP_LEVEL \
&& DECL_INITIAL (DECL) == error_mark_node \
&& !size_directive_output) \
{ \
size_directive_output = 1; \
fprintf (FILE, "%s ", SIZE_ASM_OP); \
assemble_name (FILE, name); \
putc (',', FILE); \
fprintf (FILE, HOST_WIDE_INT_PRINT_DEC, \
int_size_in_bytes (TREE_TYPE (DECL))); \
fputc ('\n', FILE); \
} \
} while (0)
/************************[ Debugger stuff ]*********************************/
/* All ELF targets can support DWARF-2. */
#undef DWARF2_DEBUGGING_INFO
#define DWARF2_DEBUGGING_INFO
/* This is BSD, so we want the DBX format. */
#undef DBX_DEBUGGING_INFO
#define DBX_DEBUGGING_INFO
/* This is BSD, so use stabs instead of DWARF debug format. */
#undef PREFERRED_DEBUGGING_TYPE
#define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
/* But allow STABS to be supported as well.
Note that we want to override some definition settings done for some
architecture's native OS's tools that don't apply to us. */
#undef ASM_IDENTIFY_GCC
#undef ASM_IDENTIFY_LANGUAGE
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