[thirdparty/glibc.git] / libc-symbols.h

/* Support macros for making weak and strong aliases for symbols,
   and for using symbol sets and linker warnings with GNU ld.
Copyright (C) 1995, 1996 Free Software Foundation, Inc.
This file is part of the GNU C Library.

The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.

The GNU C Library 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
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB.  If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA.  */

#ifndef _LIBC_SYMBOLS_H
#define _LIBC_SYMBOLS_H

/* This file's macros are included implicitly in the compilation of every
   file in the C library by -imacros.

   We include config.h which is generated by configure.
   It should define for us the following symbols:

   * HAVE_ASM_SET_DIRECTIVE if we have `.set B, A' instead of `A = B'.
   * ASM_GLOBAL_DIRECTIVE with `.globl' or `.global'.
   * HAVE_GNU_LD if using GNU ld, with support for weak symbols in a.out,
   and for symbol set and warning messages extensions in a.out and ELF.
   * HAVE_ELF if using ELF, which supports weak symbols using `.weak'.
   * HAVE_ASM_WEAK_DIRECTIVE if we have weak symbols using `.weak'.
   * HAVE_ASM_WEAKEXT_DIRECTIVE if we have weak symbols using `.weakext'.

   */

/* This is defined for the compilation of all C library code.  features.h
   tests this to avoid inclusion of stubs.h while compiling the library,
   before stubs.h has been generated.  Some library code that is shared
   with other packages also tests this symbol to see if it is being
   compiled as part of the C library.  We must define this before including
   config.h, because it makes some definitions conditional on whether libc
   itself is being compiled, or just some generator program.  */
#define _LIBC	1

/* Enable declarations of GNU extensions, since we are compiling them.  */
#define _GNU_SOURCE	1

#include <config.h>
/*
\f
*/

#ifndef	ASSEMBLER

/* Define the macros `_' and `N_' for conveniently marking translatable
   strings in the libc source code.  */

#define N_(msgid)	msgid

#include <libintl.h>
extern const char _libc_intl_domainname[];

#ifdef dgettext
/* This is defined as an optimizing macro, so use it.  */
#define	_(msgid)	dgettext (_libc_intl_domainname, (msgid))
#else
/* Be sure to use only the __ name when `dgettext' is a plain function
   instead of an optimizing macro.  */
#define	_(msgid)	__dgettext (_libc_intl_domainname, (msgid))
#endif

#endif

/*
\f
*/
/* The symbols in all the user (non-_) macros are C symbols.
   HAVE_GNU_LD without HAVE_ELF implies a.out.  */

#if defined (HAVE_ASM_WEAK_DIRECTIVE) || defined (HAVE_ASM_WEAKEXT_DIRECTIVE)
#define HAVE_WEAK_SYMBOLS
#endif

#ifndef __SYMBOL_PREFIX
#ifdef NO_UNDERSCORES
#define __SYMBOL_PREFIX
#else
#define __SYMBOL_PREFIX "_"
#endif
#endif

#ifndef C_SYMBOL_NAME
#ifdef NO_UNDERSCORES
#define C_SYMBOL_NAME(name) name
#else
#define C_SYMBOL_NAME(name) _##name
#endif
#endif


/* Define ALIAS as a strong alias for ORIGINAL.  */
#ifdef HAVE_ASM_SET_DIRECTIVE
#define strong_alias_asm(original, alias)	\
  ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias);	\
  .set C_SYMBOL_NAME (alias),C_SYMBOL_NAME (original)
#ifdef ASSEMBLER
#define strong_alias(original, alias)	strong_alias_asm (original, alias)
#else
#define strong_alias(original, alias)	\
  asm (__string_1 (ASM_GLOBAL_DIRECTIVE) " " __SYMBOL_PREFIX #alias "\n" \
       ".set " __SYMBOL_PREFIX #alias "," __SYMBOL_PREFIX #original);
#endif
#else
#define strong_alias_asm(original, alias)	\
  ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias);	\
  C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original)
#ifdef ASSEMBLER
#define strong_alias(original, alias)	strong_alias_asm (original, alias)
#else
#define strong_alias(original, alias)	\
  asm (__string_1 (ASM_GLOBAL_DIRECTIVE) " " __SYMBOL_PREFIX #alias "\n" \
       __SYMBOL_PREFIX #alias " = " __SYMBOL_PREFIX #original);
#endif
#endif

/* Helper macros used above.  */
#define __string_1(x) __string_0(x)
#define __string_0(x) #x


#ifdef HAVE_WEAK_SYMBOLS

#ifdef ASSEMBLER

#ifdef HAVE_ASM_WEAKEXT_DIRECTIVE

/* Define ALIAS as a weak alias for ORIGINAL.
   If weak aliases are not available, this defines a strong alias.  */
#define weak_alias(original, alias)	\
  .weakext C_SYMBOL_NAME (alias), C_SYMBOL_NAME (original)

/* Declare SYMBOL to be weak.  */
#define weak_symbol(symbol)	.weakext C_SYMBOL_NAME (symbol)

#else /* ! HAVE_ASM_WEAKEXT_DIRECTIVE */

/* Define ALIAS as a weak alias for ORIGINAL.
   If weak aliases are not available, this defines a strong alias.  */
#define weak_alias(original, alias)	\
  .weak C_SYMBOL_NAME (alias);	\
  C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original)

/* Declare SYMBOL to be weak.  */
#define weak_symbol(symbol)	.weak C_SYMBOL_NAME (symbol)

#endif /* ! HAVE_ASM_WEAKEXT_DIRECTIVE */

#else /* ! ASSEMBLER */

#ifdef HAVE_ASM_WEAKEXT_DIRECTIVE
#define weak_symbol(symbol)	asm (".weakext " __SYMBOL_PREFIX #symbol);
#define weak_alias(original, alias) \
  asm (".weakext " __SYMBOL_PREFIX #alias ", " __SYMBOL_PREFIX #original);
#else /* ! HAVE_ASM_WEAKEXT_DIRECTIVE */
#define weak_symbol(symbol)	asm (".weak " __SYMBOL_PREFIX #symbol);
#define weak_alias(original, alias) \
  asm (".weak " __SYMBOL_PREFIX #alias "\n" \
       __SYMBOL_PREFIX #alias " = " __SYMBOL_PREFIX #original);
#endif /* ! HAVE_ASM_WEAKEXT_DIRECTIVE */
#endif /* ! ASSEMBLER */
#else
#define	weak_alias(original, alias) strong_alias(original, alias)
#define weak_symbol(symbol)	/* Do nothing.  */
#endif


#if (!defined (ASSEMBLER) && \
     (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 8)))
/* GCC 2.8 and later has special syntax for weak symbols and aliases.
   Using that is better when possible, because the compiler and assembler
   are better clued in to what we are doing.  */
#undef	strong_alias
#define strong_alias(name, aliasname) \
  __typeof (name) aliasname __attribute__ ((alias (#name)));

#ifdef HAVE_WEAK_SYMBOLS
#undef	weak_symbol
#define weak_symbol(name) \
  extern __typeof (name) name __attribute__ ((weak));
#undef	weak_alias
#define weak_alias(name, aliasname) \
  __typeof (name) aliasname __attribute__ ((weak, alias (#name)));
#endif	/* HAVE_WEAK_SYMBOLS.  */
#endif	/* Not ASSEMBLER, and GCC 2.8 or later.  */


/* When a reference to SYMBOL is encountered, the linker will emit a
   warning message MSG.  */
#ifdef HAVE_GNU_LD
#ifdef HAVE_ELF
#define link_warning(symbol, msg)			\
  static const char __evoke_link_warning_##symbol[]	\
    __attribute__ ((section (".gnu.warning." #symbol))) = msg;
#else
#define link_warning(symbol, msg)		\
  asm(".stabs \"" msg "\",30,0,0,0\n"	\
      ".stabs \"" __SYMBOL_PREFIX #symbol "\",1,0,0,0\n");
#endif
#else
/* We will never be heard; they will all die horribly.  */
#define link_warning(symbol, msg)
#endif

/* A canned warning for sysdeps/stub functions.  */
#define	stub_warning(name) \
  link_warning (name, \
		"warning: " #name " is not implemented and will always fail")

/*
\f
*/

#ifdef HAVE_GNU_LD

/* Symbol set support macros.  */

#ifdef HAVE_ELF

/* Make SYMBOL, which is in the text segment, an element of SET.  */
#define text_set_element(set, symbol)	_elf_set_element(set, symbol)
/* Make SYMBOL, which is in the data segment, an element of SET.  */
#define data_set_element(set, symbol)	_elf_set_element(set, symbol)
/* Make SYMBOL, which is in the bss segment, an element of SET.  */
#define bss_set_element(set, symbol)	_elf_set_element(set, symbol)

/* These are all done the same way in ELF.
   There is a new section created for each set.  */
#ifdef PIC
/* When building a shared library, make the set section writable,
   because it will need to be relocated at run time anyway.  */
#define _elf_set_element(set, symbol) \
  static const void *__elf_set_##set##_element_##symbol##__ \
    __attribute__ ((unused, section (#set))) = &(symbol)
#else
#define _elf_set_element(set, symbol) \
  static const void *const __elf_set_##set##_element_##symbol##__ \
    __attribute__ ((unused, section (#set))) = &(symbol)
#endif

/* Define SET as a symbol set.  This may be required (it is in a.out) to
   be able to use the set's contents.  */
#define symbol_set_define(set)	symbol_set_declare(set)

/* Declare SET for use in this module, if defined in another module.  */
#define symbol_set_declare(set)	\
  extern void *const __start_##set __attribute__ ((__weak__));		\
  extern void *const __stop_##set __attribute__ ((__weak__));		\
  /* Gratuitously repeat weak decl, in case using broken GCC (<2.8).  */\
  weak_symbol (__start_##set) weak_symbol (__stop_##set)

/* Return a pointer (void *const *) to the first element of SET.  */
#define symbol_set_first_element(set)	(&__start_##set)

/* Return true iff PTR (a void *const *) has been incremented
   past the last element in SET.  */
#define symbol_set_end_p(set, ptr)	((ptr) >= &__stop_##set)

#else	/* Not ELF: a.out.  */

#define	text_set_element(set, symbol)	\
  asm(".stabs \"" __SYMBOL_PREFIX #set "\",23,0,0," __SYMBOL_PREFIX #symbol)
#define	data_set_element(set, symbol)	\
  asm(".stabs \"" __SYMBOL_PREFIX #set "\",25,0,0," __SYMBOL_PREFIX #symbol)
#define	bss_set_element(set, symbol)	?error Must use initialized data.
#define symbol_set_define(set)		void *const (set)[1];
#define symbol_set_declare(set)		extern void *const (set)[1];

#define symbol_set_first_element(set)	&(set)[1]
#define symbol_set_end_p(set, ptr)	(*(ptr) == 0)

#endif	/* ELF.  */
#endif	/* Have GNU ld.  */

#endif /* libc-symbols.h */
Commit	Line	Data
28f540f4 RM	1	/* Support macros for making weak and strong aliases for symbols,
28f540f4 RM	2	and for using symbol sets and linker warnings with GNU ld.
92777700	3	Copyright (C) 1995, 1996 Free Software Foundation, Inc.
28f540f4 RM	4	This file is part of the GNU C Library.
	5
	6	The GNU C Library is free software; you can redistribute it and/or
	7	modify it under the terms of the GNU Library General Public License as
	8	published by the Free Software Foundation; either version 2 of the
	9	License, or (at your option) any later version.
	10
	11	The GNU C Library 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 GNU
	14	Library General Public License for more details.
	15
	16	You should have received a copy of the GNU Library General Public
	17	License along with the GNU C Library; see the file COPYING.LIB. If
	18	not, write to the Free Software Foundation, Inc., 675 Mass Ave,
	19	Cambridge, MA 02139, USA. */
	20
	21	#ifndef _LIBC_SYMBOLS_H
	22	#define _LIBC_SYMBOLS_H
	23
	24	/* This file's macros are included implicitly in the compilation of every
	25	file in the C library by -imacros.
	26
	27	We include config.h which is generated by configure.
	28	It should define for us the following symbols:
	29
c224a18a RM	30	* HAVE_ASM_SET_DIRECTIVE if we have `.set B, A' instead of `A = B'.
c224a18a RM	31	* ASM_GLOBAL_DIRECTIVE with `.globl' or `.global'.
28f540f4 RM	32	* HAVE_GNU_LD if using GNU ld, with support for weak symbols in a.out,
28f540f4 RM	33	and for symbol set and warning messages extensions in a.out and ELF.
c224a18a RM	34	* HAVE_ELF if using ELF, which supports weak symbols using `.weak'.
	35	* HAVE_ASM_WEAK_DIRECTIVE if we have weak symbols using `.weak'.
	36	* HAVE_ASM_WEAKEXT_DIRECTIVE if we have weak symbols using `.weakext'.
28f540f4 RM	37
28f540f4 RM	38	*/
28f540f4	39
92777700 RM	40	/* This is defined for the compilation of all C library code. features.h
	41	tests this to avoid inclusion of stubs.h while compiling the library,
	42	before stubs.h has been generated. Some library code that is shared
	43	with other packages also tests this symbol to see if it is being
	44	compiled as part of the C library. We must define this before including
	45	config.h, because it makes some definitions conditional on whether libc
	46	itself is being compiled, or just some generator program. */
c709e372	47	#define _LIBC 1
92777700	48
d3669add RM	49	/* Enable declarations of GNU extensions, since we are compiling them. */
	50	#define _GNU_SOURCE 1
	51
92777700	52	#include <config.h>
cb2f05ed RM	53	/*
cb2f05ed RM	54	\f
b3a59f40	55	*/
28f540f4	56
b3a59f40	57	#ifndef ASSEMBLER
f45e34fc RM	58
	59	/* Define the macros `_' and `N_' for conveniently marking translatable
	60	strings in the libc source code. */
	61
	62	#define N_(msgid) msgid
	63
cb2f05ed RM	64	#include <libintl.h>
cb2f05ed RM	65	extern const char _libc_intl_domainname[];
f45e34fc	66
cb2f05ed RM	67	#ifdef dgettext
	68	/* This is defined as an optimizing macro, so use it. */
	69	#define _(msgid) dgettext (_libc_intl_domainname, (msgid))
	70	#else
	71	/* Be sure to use only the __ name when `dgettext' is a plain function
	72	instead of an optimizing macro. */
	73	#define _(msgid) __dgettext (_libc_intl_domainname, (msgid))
	74	#endif
f45e34fc	75
b3a59f40	76	#endif
cb2f05ed RM	77
	78	/*
	79	\f
	80	*/
c224a18a RM	81	/* The symbols in all the user (non-_) macros are C symbols.
c224a18a RM	82	HAVE_GNU_LD without HAVE_ELF implies a.out. */
28f540f4	83
c224a18a	84	#if defined (HAVE_ASM_WEAK_DIRECTIVE) \|\| defined (HAVE_ASM_WEAKEXT_DIRECTIVE)
28f540f4 RM	85	#define HAVE_WEAK_SYMBOLS
28f540f4 RM	86	#endif
28f540f4 RM	87
28f540f4 RM	88	#ifndef __SYMBOL_PREFIX
28f540f4 RM	89	#ifdef NO_UNDERSCORES
	90	#define __SYMBOL_PREFIX
	91	#else
	92	#define __SYMBOL_PREFIX "_"
	93	#endif
	94	#endif
	95
	96	#ifndef C_SYMBOL_NAME
	97	#ifdef NO_UNDERSCORES
	98	#define C_SYMBOL_NAME(name) name
	99	#else
	100	#define C_SYMBOL_NAME(name) _##name
	101	#endif
	102	#endif
	103
d02907df	104
28f540f4	105	/* Define ALIAS as a strong alias for ORIGINAL. */
335aa320	106	#ifdef HAVE_ASM_SET_DIRECTIVE
28f540f4	107	#define strong_alias_asm(original, alias) \
d02907df	108	ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias); \
28f540f4 RM	109	.set C_SYMBOL_NAME (alias),C_SYMBOL_NAME (original)
	110	#ifdef ASSEMBLER
	111	#define strong_alias(original, alias) strong_alias_asm (original, alias)
	112	#else
	113	#define strong_alias(original, alias) \
d02907df RM	114	asm (__string_1 (ASM_GLOBAL_DIRECTIVE) " " __SYMBOL_PREFIX #alias "\n" \
d02907df RM	115	".set " __SYMBOL_PREFIX #alias "," __SYMBOL_PREFIX #original);
28f540f4	116	#endif
335aa320 RM	117	#else
335aa320 RM	118	#define strong_alias_asm(original, alias) \
d02907df	119	ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias); \
335aa320 RM	120	C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original)
	121	#ifdef ASSEMBLER
	122	#define strong_alias(original, alias) strong_alias_asm (original, alias)
	123	#else
	124	#define strong_alias(original, alias) \
d02907df RM	125	asm (__string_1 (ASM_GLOBAL_DIRECTIVE) " " __SYMBOL_PREFIX #alias "\n" \
d02907df RM	126	__SYMBOL_PREFIX #alias " = " __SYMBOL_PREFIX #original);
335aa320 RM	127	#endif
335aa320 RM	128	#endif
28f540f4	129
d02907df RM	130	/* Helper macros used above. */
	131	#define __string_1(x) __string_0(x)
	132	#define __string_0(x) #x
	133
	134
28f540f4	135	#ifdef HAVE_WEAK_SYMBOLS
c224a18a	136
28f540f4	137	#ifdef ASSEMBLER
d02907df	138
c224a18a RM	139	#ifdef HAVE_ASM_WEAKEXT_DIRECTIVE
	140
	141	/* Define ALIAS as a weak alias for ORIGINAL.
	142	If weak aliases are not available, this defines a strong alias. */
	143	#define weak_alias(original, alias) \
	144	.weakext C_SYMBOL_NAME (alias), C_SYMBOL_NAME (original)
	145
	146	/* Declare SYMBOL to be weak. */
	147	#define weak_symbol(symbol) .weakext C_SYMBOL_NAME (symbol)
	148
	149	#else /* ! HAVE_ASM_WEAKEXT_DIRECTIVE */
	150
d02907df RM	151	/* Define ALIAS as a weak alias for ORIGINAL.
d02907df RM	152	If weak aliases are not available, this defines a strong alias. */
28f540f4 RM	153	#define weak_alias(original, alias) \
	154	.weak C_SYMBOL_NAME (alias); \
	155	C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original)
e6964dd4 RM	156
	157	/* Declare SYMBOL to be weak. */
	158	#define weak_symbol(symbol) .weak C_SYMBOL_NAME (symbol)
d02907df	159
c224a18a RM	160	#endif /* ! HAVE_ASM_WEAKEXT_DIRECTIVE */
	161
	162	#else /* ! ASSEMBLER */
	163
	164	#ifdef HAVE_ASM_WEAKEXT_DIRECTIVE
	165	#define weak_symbol(symbol) asm (".weakext " __SYMBOL_PREFIX #symbol);
	166	#define weak_alias(original, alias) \
	167	asm (".weakext " __SYMBOL_PREFIX #alias ", " __SYMBOL_PREFIX #original);
	168	#else /* ! HAVE_ASM_WEAKEXT_DIRECTIVE */
e6964dd4	169	#define weak_symbol(symbol) asm (".weak " __SYMBOL_PREFIX #symbol);
28f540f4 RM	170	#define weak_alias(original, alias) \
	171	asm (".weak " __SYMBOL_PREFIX #alias "\n" \
	172	__SYMBOL_PREFIX #alias " = " __SYMBOL_PREFIX #original);
c224a18a RM	173	#endif /* ! HAVE_ASM_WEAKEXT_DIRECTIVE */
c224a18a RM	174	#endif /* ! ASSEMBLER */
28f540f4 RM	175	#else
28f540f4 RM	176	#define weak_alias(original, alias) strong_alias(original, alias)
e6964dd4	177	#define weak_symbol(symbol) /* Do nothing. */
28f540f4 RM	178	#endif
	179
	180
958f803f	181	#if (!defined (ASSEMBLER) && \
9199ec6e RM	182	(__GNUC__ > 2 \|\| (__GNUC__ == 2 && __GNUC_MINOR__ >= 8)))
9199ec6e RM	183	/* GCC 2.8 and later has special syntax for weak symbols and aliases.
958f803f RM	184	Using that is better when possible, because the compiler and assembler
	185	are better clued in to what we are doing. */
	186	#undef strong_alias
	187	#define strong_alias(name, aliasname) \
6b628d36	188	__typeof (name) aliasname __attribute__ ((alias (#name)));
958f803f RM	189
	190	#ifdef HAVE_WEAK_SYMBOLS
	191	#undef weak_symbol
	192	#define weak_symbol(name) \
54da5be3	193	extern __typeof (name) name __attribute__ ((weak));
958f803f RM	194	#undef weak_alias
958f803f RM	195	#define weak_alias(name, aliasname) \
6b628d36	196	__typeof (name) aliasname __attribute__ ((weak, alias (#name)));
958f803f	197	#endif /* HAVE_WEAK_SYMBOLS. */
9199ec6e	198	#endif /* Not ASSEMBLER, and GCC 2.8 or later. */
958f803f RM	199
958f803f RM	200
28f540f4	201
44c8d1a2 RM	202	/* When a reference to SYMBOL is encountered, the linker will emit a
44c8d1a2 RM	203	warning message MSG. */
28f540f4 RM	204	#ifdef HAVE_GNU_LD
28f540f4 RM	205	#ifdef HAVE_ELF
44c8d1a2 RM	206	#define link_warning(symbol, msg) \
	207	static const char __evoke_link_warning_##symbol[] \
	208	__attribute__ ((section (".gnu.warning." #symbol))) = msg;
28f540f4	209	#else
44c8d1a2	210	#define link_warning(symbol, msg) \
28f540f4	211	asm(".stabs \"" msg "\",30,0,0,0\n" \
44c8d1a2	212	".stabs \"" __SYMBOL_PREFIX #symbol "\",1,0,0,0\n");
28f540f4 RM	213	#endif
	214	#else
	215	/* We will never be heard; they will all die horribly. */
44c8d1a2	216	#define link_warning(symbol, msg)
28f540f4 RM	217	#endif
	218
	219	/* A canned warning for sysdeps/stub functions. */
	220	#define stub_warning(name) \
44c8d1a2 RM	221	link_warning (name, \
44c8d1a2 RM	222	"warning: " #name " is not implemented and will always fail")
5f9e57ba RM	223
5f9e57ba RM	224	/*
28f540f4	225	\f
5f9e57ba RM	226	*/
5f9e57ba RM	227
28f540f4 RM	228	#ifdef HAVE_GNU_LD
	229
	230	/* Symbol set support macros. */
	231
	232	#ifdef HAVE_ELF
	233
	234	/* Make SYMBOL, which is in the text segment, an element of SET. */
	235	#define text_set_element(set, symbol) _elf_set_element(set, symbol)
	236	/* Make SYMBOL, which is in the data segment, an element of SET. */
	237	#define data_set_element(set, symbol) _elf_set_element(set, symbol)
	238	/* Make SYMBOL, which is in the bss segment, an element of SET. */
	239	#define bss_set_element(set, symbol) _elf_set_element(set, symbol)
	240
	241	/* These are all done the same way in ELF.
	242	There is a new section created for each set. */
53afa8d9 RM	243	#ifdef PIC
	244	/* When building a shared library, make the set section writable,
	245	because it will need to be relocated at run time anyway. */
	246	#define _elf_set_element(set, symbol) \
	247	static const void *__elf_set_##set##_element_##symbol##__ \
d6e2f671	248	__attribute__ ((unused, section (#set))) = &(symbol)
53afa8d9	249	#else
28f540f4 RM	250	#define _elf_set_element(set, symbol) \
28f540f4 RM	251	static const void *const __elf_set_##set##_element_##symbol##__ \
d6e2f671	252	__attribute__ ((unused, section (#set))) = &(symbol)
53afa8d9	253	#endif
28f540f4 RM	254
	255	/* Define SET as a symbol set. This may be required (it is in a.out) to
	256	be able to use the set's contents. */
	257	#define symbol_set_define(set) symbol_set_declare(set)
	258
	259	/* Declare SET for use in this module, if defined in another module. */
	260	#define symbol_set_declare(set) \
ec967c06 RM	261	extern void *const __start_##set __attribute__ ((__weak__)); \
	262	extern void *const __stop_##set __attribute__ ((__weak__)); \
	263	/* Gratuitously repeat weak decl, in case using broken GCC (<2.8). */\
	264	weak_symbol (__start_##set) weak_symbol (__stop_##set)
28f540f4 RM	265
	266	/* Return a pointer (void const ) to the first element of SET. */
	267	#define symbol_set_first_element(set) (&__start_##set)
	268
	269	/* Return true iff PTR (a void const ) has been incremented
	270	past the last element in SET. */
	271	#define symbol_set_end_p(set, ptr) ((ptr) >= &__stop_##set)
	272
	273	#else /* Not ELF: a.out. */
	274
	275	#define text_set_element(set, symbol) \
	276	asm(".stabs \"" __SYMBOL_PREFIX #set "\",23,0,0," __SYMBOL_PREFIX #symbol)
	277	#define data_set_element(set, symbol) \
	278	asm(".stabs \"" __SYMBOL_PREFIX #set "\",25,0,0," __SYMBOL_PREFIX #symbol)
	279	#define bss_set_element(set, symbol) ?error Must use initialized data.
	280	#define symbol_set_define(set) void *const (set)[1];
	281	#define symbol_set_declare(set) extern void *const (set)[1];
	282
	283	#define symbol_set_first_element(set) &(set)[1]
	284	#define symbol_set_end_p(set, ptr) (*(ptr) == 0)
	285
	286	#endif /* ELF. */
	287	#endif /* Have GNU ld. */
	288
	289	#endif /* libc-symbols.h */