Update.

2002-08-02  Ulrich Drepper  <drepper@redhat.com>

	* configure.in (HAVE_BROKEN_ALIAS_ATTRIBUTE): Add check for
	broken alias attribute handling.
	* config.h.in (HAVE_BROKEN_ALIAS_ATTRIBUTE): Add.

	* assert/assert.c (__assert_fail): Fix typo in comment.

	* include/rpc/rpc.h: Declare __libc_tsd_RPC_VARS if USE_TLS &&
	HAVE___THREAD.
	* sunrpc/rpc_thread.c: Don't define __libc_tsd_RPC_VARS as static
	if USE_TLS && HAVE___THREAD.
	* sunrpc/Versions [libc] (GLIBC_PRIVATE): Export __libc_tsd_RPC_VARS.

2002-08-02  Jakub Jelinek  <jakub@redhat.com>

	* assert/assert.c (__assert_fail): Remove undef.
	Replace INTDEF with libc_hidden_def.
	* assert/__assert.c (__assert): Remove INTUSE.
	* elf/dl-minimal.c (__assert_fail): Replace INTDEF with
	libc_hidden_weak.
	* include/libc-symbols.h (hidden_proto, hidden_def, hidden_weak,
	hidden_ver, libc_hidden_proto, libc_hidden_def, libc_hidden_weak,
	libc_hidden_ver, rtld_hidden_proto, rtld_hidden_def, rtld_hidden_weak,
	rltd_hidden_ver, libm_hidden_proto, libm_hidden_def, libm_hidden_weak,
	libm_hiden_ver): Define.
	* include/assert.h (__assert_fail_internal): Remove.
	(__assert_fail): Add prototype.  Add hidden_proto.
	* include/libc-internal.h (__libc_freeres, __profile_frequency): Add
	libc_hidden_proto.
	* include/wchar.h (__mbrtowc_internal, __mbrlen_internal): Remove.
	(__mbrtowc, __mbrlen): Use libc_hidden_proto.  Remove macros.
	* include/string.h (__mempcpy, __stpncpy, __rawmemchr, __strcasecmp):
	Add libc_hidden_proto.
	* include/fcntl.h (__open64, __libc_open, __libc_fcntl, __open,
	__fcntl): Add libc_hidden_proto.  Remove macros.
	(__open_internal, __fcntl_internal): Remove.
	* libio/iofdopen.c (_IO_fcntl): Remove INTUSE from __fcntl.
	* malloc/set-freeres.c (__libc_freeres): Add libc_hidden_def.
	* nss/nsswitch.h (__nss_database_lookup, __nss_next): Add
	libc_hiden_proto.
	* nss/nsswitch.c (__nss_database_lookup, __nss_next): Add
	libc_hidden_def.
	* sysdeps/generic/mempcpy.c (__mempcpy): Remove undef.
	Add libc_hidden_def.
	* sysdeps/generic/open64.c (__open64): Add libc_hidden_def.
	* sysdeps/generic/open.c (__open): Remove undef.
	Add libc_hidden_def.  Remove INTDEF.
	* sysdeps/generic/fcntl.c (__fcntl): Remove undef.
	Add libc_hidden_def.
	* sysdeps/mach/hurd/fcntl.c (__fcntl): Likewise.
	* sysdeps/i386/i586/mempcpy.S (__mempcpy): Add libc_hidden_def.
	* sysdeps/i386/i686/mempcpy.S (__mempcpy): Likewise.
	* sysdeps/mach/hurd/fcntl.c (__libc_fcntl, __fcntl): Remove undef.
	(__fcntl): Remove INTDEF2.  Add libc_hidden_weak.
	(__libc_fcntl): Add libc_hidden_def.
	* sysdeps/mach/hurd/open.c (__libc_open, __open): Remove undef.
	(__open): Remove INTDEF2.  Add libc_hidden_weak.
	(__libc_open): Add libc_hidden_def.
	* sysdeps/posix/open64.c (__open64): Add libc_hidden_weak.
	* sysdeps/standalone/open.c (__open): Add libc_hidden_def.
	* sysdeps/unix/sysv/aix/fcntl.c (__libc_fcntl, __fcntl): Remove undef.
	Add libc_hidden_def.
	* sysdeps/unix/sysv/aix/open.c (__libc_open, __open): Remove undef.
	Add libc_hidden_def.
	* sysdeps/unix/sysv/linux/i386/fcntl.c (__libc_fcntl, __fcntl): Remove
	undef.
	(__fcntl): Remove INTDEF2.  Add libc_hidden_weak.
	(__libc_fcntl): Add libc_hidden_def.
	* sysdeps/unix/sysv/linux/syscalls.list (__fcntl_internal,
	__getpgid_internal, __chown_internal): Remove.
	(__GI___fcntl, __GI___libc_fcntl, __GI___getpgid, __GI___pipe,
	__GI___sched_setscheduler, __GI___select, __GI___setpgid,
	__GI___chown): Add.
	* sysdeps/unix/syscalls.list (__close_internal, __dup2_internal,
	__getpid_internal, __open_internal, __write_internal): Remove.
	(__GI___fcntl, __GI___libc_fcntl, __GI___open, __GI___libc_open,
	__GI___chown, __GI___close, __GI___dup2, __GI___getpid,
	__GI___libc_open, __GI___open, __GI___read, __GI___libc_read,
	__GI___select, __GI___statfs, __GI___write, __GI___libc_write): Add.
	* wcsmbs/mbrlen.c (__mbrlen): Remove undef.
	Replace INTDEF with libc_hidden_def.
	* wcsmbs/mbrtowc.c (__mbrtowc): Likewise.
	* catgets/catgetsinfo.h (__open_catalog): Add libc_hidden_proto.
	* catgets/open_catalog.c (__open_catalog): Add libc_hidden_def.
	* elf/dl-profile.c (__profile_frequency): Add libc_hidden_proto.
	* include/rpc/rpc.h (__rpc_thread_svc_fdset, __rpc_thread_createerr):
	Add libc_hidden_proto.
	* include/sys/poll.h (__poll): Add libc_hidden_proto.
	* include/sys/select.h (__select): Likewise.
	* include/sys/socket.h (__send): Likewise.
	* include/sys/statfs.h (__statfs): Likewise.
	* include/unistd.h (__pwrite64, __libc_read, __pipe, __chown, __dup2,
	__getpid, __getpgid, __setpgid, __close, __read, __write,
	__getpagesize, __sbrk): Likewise.
	(__chown_internal, __dup2_internal, __getpid_internal,
	__getpgid_internal, __close_internal, __write_internal,
	__getpagesize_internal): Remove.
	(__close, __dup2, __getpagesize, __getpgid, __getpid, __libc_write):
	Remove macros.
	* include/printf.h (__printf_fp): Add libc_hidden_proto.
	* include/sched.h (__sched_setscheduler): Likewise.
	* include/resolv.h (__res_ninit, __res_randomid): Likewise.
	* include/stdlib.h (__secure_getenv): Likewise.
	* include/signal.h (__sigaction, __sigsuspend): Likewise.
	* inet/getaliasent_r.c (NSS_attribute_hidden): Remove.
	* inet/getaliasname_r.c (NSS_attribute_hidden): Remove.
	* inet/getnetbyad_r.c (NSS_attribute_hidden): Remove.
	* inet/getnetbynm_r.c (NSS_attribute_hidden): Remove.
	* inet/getnetent_r.c (NSS_attribute_hidden): Remove.
	* inet/getproto_r.c (NSS_attribute_hidden): Remove.
	* inet/getprtent_r.c (NSS_attribute_hidden): Remove.
	* inet/getprtname_r.c (NSS_attribute_hidden): Remove.
	* inet/getrpcbyname_r.c (NSS_attribute_hidden): Remove.
	* inet/getrpcbynumber_r.c (NSS_attribute_hidden): Remove.
	* inet/getrpcent_r.c (NSS_attribute_hidden): Remove.
	* inet/getservent_r.c (NSS_attribute_hidden): Remove.
	* inet/getsrvbynm_r.c (NSS_attribute_hidden): Remove.
	* inet/getsrvbypt_r.c (NSS_attribute_hidden): Remove.
	* inet/gethstbyad_r.c (DB_LOOKUP_FCT): Remove INTUSE.
	* inet/gethstbynm2_r.c (DB_LOOKUP_FCT): Likewise.
	* inet/gethstbynm_r.c (DB_LOOKUP_FCT): Likewise.
	* inet/gethstent_r.c (DB_LOOKUP_FCT): Likewise.
	* libio/genops.c (__overflow): Add libc_hidden_def.
	* libio/iovdprintf.c: Remove libio.h include.
	* libio/libioP.h (libc_hidden_proto, libc_hidden_def,
	libc_hidden_weak): Define to nothing if not defined.
	(__overflow, __woverflow): Add libc_hidden_proto.
	* libio/wgenops.c (__woverflow): Add libc_hidden_def.
	* nss/getXXent_r.c (NSS_attribute_hidden): Remove.
	(DB_LOOKUP_FCT): Add libc_hidden_proto.
	* nss/getXXbyYY_r.c (NSS_attribute_hidden): Remove.
	(DB_LOOKUP_FCT): Add libc_hidden_proto.
	* nss/XXX-lookup.c (DB_LOOKUP_FCT): Add libc_hidden_proto
	and libc_hidden_def.
	* nss/hosts-lookup.c (__nss_hosts_lookup): Remove INTDEF.
	* posix/bsd-getpgrp.c (__getpgid_internal): Remove.
	(__getpgid): Add libc_hidden_proto.
	(__bsd_getpgrp): Remove INTUSE.
	* resolv/res_init.c (__res_ninit, __res_randomid): Add
	libc_hidden_def.
	* shadow/getspent_r.c (NSS_attribute_hidden): Remove.
	* shadow/getspnam_r.c (NSS_attribute_hidden): Remove.
	* stdio-common/printf_fp.c (__printf_fp): Add libc_hidden_def.
	* stdlib/strfmon.c (__printf_fp): Add libc_hidden_proto.
	* stdlib/secure-getenv.c (__secure_getenv): Add libc_hidden_def.
	* sunrpc/rpc_thread.c (__rpc_thread_svc_fdset,
	__rpc_thread_createerr): Add libc_hidden_def.
	* sysdeps/alpha/alphaev67/rawmemchr.S (__rawmemchr): Add
	libc_hidden_def.
	* sysdeps/alpha/alphaev67/stpncpy.S (__stpncpy): Likewise.
	* sysdeps/alpha/rawmemchr.S (__rawmemchr): Likewise.
	* sysdeps/alpha/stpncpy.S (__stpncpy): Likewise.
	* sysdeps/generic/chown.c (__chown): Likewise.
	* sysdeps/generic/close.c (__close): Likewise.
	* sysdeps/generic/dup2.c (__dup2): Likewise.
	* sysdeps/generic/pipe.c (__pipe): Likewise.
	* sysdeps/generic/prof-freq.c (__profile_frequency): Likewise.
	* sysdeps/generic/pwrite64.c (__pwrite64): Likewise.
	* sysdeps/generic/rawmemchr.c (__rawmemchr): Likewise.
	* sysdeps/generic/read.c (__libc_read): Likewise.
	(__read): Add libc_hidden_weak.
	* sysdeps/generic/sbrk.c (__sbrk): Add libc_hidden_def.
	* sysdeps/generic/sched_sets.c (__sched_setscheduler): Likewise.
	* sysdeps/generic/select.c (__select): Likewise.
	* sysdeps/generic/send.c (__send): Likewise.
	* sysdeps/generic/setpgid.c (__setpgid): Likewise.
	* sysdeps/generic/sigaction.c (__sigaction): Likewise.
	* sysdeps/generic/sigsuspend.c (__sigsuspend): Likewise.
	* sysdeps/generic/statfs.c (__statfs): Likewise.
	* sysdeps/generic/stpncpy.c (__stpncpy): Likewise.
	* sysdeps/generic/strcasecmp.c (__strcasecmp): Likewise.
	* sysdeps/generic/getpagesize.c (__getpagesize): Likewise.
	Remove undef and INTDEF.
	* sysdeps/generic/getpgid.c (__getpgid): Likewise.
	* sysdeps/generic/getpid.c (__getpid): Likewise.
	* sysdeps/generic/write.c (__libc_write): Likewise.
	(__write): Add libc_hidden_weak.  Remove undef and INTDEF.
	* sysdeps/i386/rawmemchr.S (__rawmemchr): Add libc_hidden_def.
	* sysdeps/i386/stpncpy.S (__stpncpy): Likewise.
	* sysdeps/m68k/rawmemchr.S (__rawmemchr): Likewise.
	* sysdeps/mach/hurd/chown.c (__chown): Likewise.  Remove INTDEF.
	* sysdeps/mach/hurd/close.c (__close): Add libc_hidden_def.
	Remove undef and INTDEF.
	* sysdeps/mach/hurd/dup2.c (__dup2): Likewise.
	* sysdeps/mach/hurd/getpgid.c (__getpgid): Likewise.
	* sysdeps/mach/hurd/getpid.c (__getpid): Likewise.
	* sysdeps/mach/getpagesize.c (__getpagesize): Likewise.
	* sysdeps/mach/hurd/write.c (__libc_write): Likewise.
	(__write): Add libc_hidden_weak.  Remove undef and INTDEF.
	* sysdeps/mach/hurd/pipe.c: Include unistd.h.
	(__pipe): Add libc_hidden_def.
	* sysdeps/mach/hurd/dl-sysdep.c (__libc_read, __libc_write): Add
	libc_hidden_weak.
	* sysdeps/mach/hurd/poll.c (__poll): Add libc_hidden_def.
	* sysdeps/mach/hurd/profil.c (__profile_frequency): Likewise.
	* sysdeps/mach/hurd/read.c (__libc_read): Likewise.
	(__read): Add libc_hidden_weak.
	* sysdeps/mach/hurd/pwrite64.c (__pwrite64): Likewise.
	(__libc_pwrite64): Add libc_hidden_def.
	* sysdeps/mach/hurd/sbrk.c (__sbrk): Likewise.
	* sysdeps/mach/hurd/select.c (__select): Likewise.
	* sysdeps/mach/hurd/send.c (__send): Likewise.
	* sysdeps/mach/hurd/setpgid.c (__setpgid): Likewise.
	* sysdeps/mach/hurd/sigaction.c (__sigaction): Likewise.
	* sysdeps/mach/hurd/sigsuspend.c (__sigsuspend): Likewise.
	* sysdeps/mach/hurd/statfs.c (__statfs): Likewise.
	* sysdeps/posix/dup2.c: Likewise.
	Remove undef and INTDEF.
	* sysdeps/posix/getpagesize.c (__getpagesize): Likewise.
	* sysdeps/posix/pwrite64.c (__libc_pwrite64): Add libc_hidden_def.
	(__pwrite64): Add libc_hidden_weak.
	* sysdeps/posix/sigsuspend.c (__sigsuspend): Add libc_hidden_def.
	* sysdeps/sparc/sparc64/rawmemchr.S (__rawmemchr): Likewise.
	* sysdeps/sparc/sparc64/stpncpy.S (__stpncpy): Likewise.
	* sysdeps/standalone/close.c (__close): Likewise.
	* sysdeps/standalone/write.c (__libc_write): Likewise.
	(__write): Add libc_hidden_weak.
	* sysdeps/standalone/read.c (__read): Likewise.
	(__libc_read): Add libc_hidden_def.
	* sysdeps/unix/grantpt.c (grantpt): Remove INTUSE.
	* sysdeps/unix/bsd/m68k/pipe.S (__pipe): Add libc_hidden_def.
	* sysdeps/unix/bsd/osf/alpha/pipe.S (__pipe): Likewise.
	* sysdeps/unix/bsd/vax/pipe.S (__pipe): Likewise.
	* sysdeps/unix/bsd/syscalls.list (__GI___getpagesize): Likewise.
	* sysdeps/unix/bsd/poll.c (__poll): Likewise.
	* sysdeps/unix/bsd/sigaction.c (__sigaction): Likewise.
	* sysdeps/unix/bsd/sigsuspend.c (__sigsuspend): Likewise.
	* sysdeps/unix/common/syscalls.list (__GI___getpgid, __GI___setpgid,
	__GI___sigaction): Add.
	* sysdeps/unix/i386/pipe.S (__pipe): Add libc_hidden_def.
	* sysdeps/unix/inet/syscalls.list (__GI___send): Add.
	* sysdeps/unix/mips/pipe.S (__pipe): Add libc_hidden_def.
	* sysdeps/unix/sparc/pipe.S (__pipe): Likewise.
	* sysdeps/unix/sysv/irix4/syscalls.list (__GI___getpgid,
	__GI___setpgid): Add.
	* sysdeps/unix/sysv/aix/chown.c (__chown): Add libc_hidden_def.
	Remove undef and INTDEF.
	* sysdeps/unix/sysv/aix/getpgid.c (__getpgid): Likewise.
	* sysdeps/unix/sysv/aix/write.c (__write, __libc_write): Likewise.
	* sysdeps/unix/sysv/aix/close.c (__close): Add libc_hidden_def.
	* sysdeps/unix/sysv/aix/getpid.c (__getpid): Likewise.
	* sysdeps/unix/sysv/aix/pipe.c (__pipe): Likewise.
	* sysdeps/unix/sysv/aix/read.c (__read, __libc_read): Likewise.
	* sysdeps/unix/sysv/aix/poll.c (__poll): Likewise.
	* sysdeps/unix/sysv/aix/sbrk.c (__sbrk): Likewise.
	* sysdeps/unix/sysv/aix/sigaction.c (__sigaction): Likewise.
	* sysdeps/unix/sysv/aix/sigsuspend.c (__sigsuspend): Likewise.
	* sysdeps/unix/sysv/aix/statfs.c (__statfs): Likewise.
	* sysdeps/unix/sysv/aix/select.c (__select): Likewise.
	* sysdeps/unix/sysv/aix/setpgid.c (__setpgid): Likewise.
	* sysdeps/unix/sysv/linux/alpha/pipe.S (__pipe): Likewise.
	* sysdeps/unix/sysv/linux/alpha/syscalls.list (__GI___pwrite64,
	__GI___statfs, __GI___send): Add.
	* sysdeps/unix/sysv/linux/alpha/select.S (__select): Add
	libc_hidden_ver resp. libc_hidden_def.
	* sysdeps/unix/sysv/linux/alpha/sigsuspend.S (__sigsuspend): Add
	libc_hidden_def.
	* sysdeps/unix/sysv/linux/ia64/getpagesize.c (__getpagesize):
	Likewise.  Remove undef and INTDEF.
	* sysdeps/unix/sysv/linux/ia64/pipe.S (__pipe): Add libc_hidden_def.
	* sysdeps/unix/sysv/linux/ia64/syscalls.list (__GI___pwrite64,
	__GI___statfs, __GI___send): Add.
	* sysdeps/unix/sysv/linux/ia64/sigaction.c (__sigaction): Add
	libc_hidden_def.
	* sysdeps/unix/sysv/linux/ia64/sigsuspend.c (__sigsuspend):
	Likewise.
	* sysdeps/unix/sysv/linux/sh/pipe.S (__pipe): Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-32/chown.c (__chown): Add
	libc_hidden_ver resp. libc_hidden_def.
	* sysdeps/unix/sysv/linux/s390/s390-64/syscalls.list (__GI___pwrite64,
	__GI___send): Add.
	* sysdeps/unix/sysv/linux/s390/s390-64/sigaction.c (__sigaction):
	Add libc_hidden_weak.
	* sysdeps/unix/sysv/linux/s390/s390-64/sigsuspend.c (__sigsuspend):
	Add libc_hidden_def.
	* sysdeps/unix/sysv/linux/hppa/syscalls.list (__GI___send): Add.
	* sysdeps/unix/sysv/linux/arm/sigaction.c (__sigaction): Add
	libc_hidden_weak.
	* sysdeps/unix/sysv/linux/i386/chown.c (__chown): Add libc_hidden_ver
	resp. libc_hidden_def.
	* sysdeps/unix/sysv/linux/i386/sigaction.c (__sigaction): Add
	libc_hidden_weak.
	* sysdeps/unix/sysv/linux/m68k/chown.c (__chown): Likewise.  Remove
	INTDEF.
	* sysdeps/unix/sysv/linux/m68k/getpagesize.c (__getpagesize):
	Likewise.  Remove undef.
	* sysdeps/unix/sysv/linux/mips/pwrite64.c (__pwrite64): Add
	libc_hidden_weak.
	* sysdeps/unix/sysv/linux/mips/syscalls.list (__GI___send): Add.
	* sysdeps/unix/sysv/linux/mips/sigaction.c (__sigaction): Add
	libc_hidden_weak.
	* sysdeps/unix/sysv/linux/powerpc/chown.c (__chown): Add
	libc_hidden_def.
	* sysdeps/unix/sysv/linux/powerpc/pwrite64.c (__pwrite64): Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc32/getpagesize.c (__getpagesize):
	Likewise.  Remove undef and INTDEF.
	* sysdeps/unix/sysv/linux/sparc/sparc32/pipe.S (__pipe): Add
	libc_hidden_def.
	* sysdeps/unix/sysv/linux/sparc/sparc32/sigaction.c (__sigaction): Add
	libc_hidden_weak.
	* sysdeps/unix/sysv/linux/sparc/sparc64/pipe.S (__pipe): Add
	libc_hidden_def.
	* sysdeps/unix/sysv/linux/sparc/sparc64/syscalls.list
	(__GI___pwrite64, __GI___statfs, __GI___select, __GI___send): Add.
	* sysdeps/unix/sysv/linux/sparc/sparc64/sigaction.c (__sigaction): Add
	libc_hidden_weak.
	* sysdeps/unix/sysv/linux/sparc/sparc64/sigsuspend.c (__sigsuspend):
	Add libc_hidden_def.
	* sysdeps/unix/sysv/linux/x86_64/syscalls.list (__GI___pwrite64,
	__GI___statfs): Add.
	* sysdeps/unix/sysv/linux/x86_64/send.c (__send): Add
	libc_hidden_weak.
	* sysdeps/unix/sysv/linux/x86_64/sigaction.c (__sigaction): Likewise.
	* sysdeps/unix/sysv/linux/getpagesize.c: Add libc_hidden_def.
	Remove undef and INTDEF.
	* sysdeps/unix/sysv/linux/poll.c (__poll): Add libc_hidden_def.
	* sysdeps/unix/sysv/linux/pwrite64.c (__pwrite64): Add
	libc_hidden_def.
	* sysdeps/unix/sysv/linux/send.S (__send): Likewise.
	* sysdeps/unix/sysv/linux/sigaction.c (__sigaction): Add
	libc_hidden_weak.
	* sysdeps/unix/sysv/linux/sigsuspend.c (__sigsuspend): Add
	libc_hidden_def.
	* sysdeps/unix/sysv/sco3.2.4/__setpgid.c (__setpgid): Likewise.
	* sysdeps/unix/sysv/sco3.2.4/sigaction.S (__sigaction): Likewise.
	* sysdeps/unix/sysv/sysv4/solaris2/syscalls.list (__GI___sigaction):
	Add.
	* sysdeps/unix/sysv/sysv4/__getpgid.c (__getpgid): Add
	libc_hidden_def.  Remove undef and INTDEF.
	* sysdeps/unix/sysv/sysv4/getpgid.c (__getpgid): Likewise.
	* sysdeps/unix/sysv/sysv4/__setpgid.c (__setpgid): Add
	libc_hidden_def.
	* sysdeps/unix/sysv/sysv4/setpgid.c (__setpgid): Likewise.
	* sysdeps/unix/sysv/sysv4/sigaction.c (__sigaction): Likewise.
	* sysdeps/unix/sysv/sigaction.c (__sigaction): Likewise.
	* sysdeps/unix/getpagesize.c (__getpagesize): Add libc_hidden_def.
	Remove undef and INTDEF.
	* configure.in (HAVE_BROKEN_VISIBILITY_ATTRIBUTE): Add check for
	broken visibility attribute handling.
	* config.h.in (HAVE_BROKEN_VISIBILITY_ATTRIBUTE): Add.

2002-08-02  Ulrich Drepper  <drepper@redhat.com>

include/libc-symbols.h

@@ -381,4 +381,186 @@
 # define INTVARDEF2(name, newname)
 #endif
 
+/* The following macros are used for PLT bypassing within libc.so
+   (and if needed other libraries similarly).
+   First of all, you need to have the function prototyped somewhere,
+   say in foo/foo.h:
+
+   int foo (int __bar);
+
+   If calls to foo within libc.so should always go to foo defined in libc.so,
+   then in include/foo.h you add:
+
+   libc_hidden_proto (foo)
+
+   line and after the foo function definition:
+
+   int foo (int __bar)
+   {
+     return __bar;
+   }
+   libc_hidden_def (foo)
+
+   or
+
+   int foo (int __bar)
+   {
+     return __bar;
+   }
+   libc_hidden_weak (foo)
+
+   If foo is normally just an alias (strong or weak) of some other function,
+   you should use the normal strong_alias first, then add libc_hidden_def
+   or libc_hidden_weak:
+
+   int baz (int __bar)
+   {
+     return __bar;
+   }
+   strong_alias (baz, foo)
+   libc_hidden_weak (foo)
+
+   If the function should be internal to multiple objects, say ld.so and
+   libc.so, the best way is to use:
+
+   #if !defined NOT_IN_libc || defined IS_IN_rtld
+   hidden_proto (foo)
+   #endif
+
+   in include/foo.h and the normal macros at all function definitions
+   depending on what DSO they belong to.
+
+   If versioned_symbol macro is used to define foo,
+   libc_hidden_ver macro should be used, as in:
+
+   int __real_foo (int __bar)
+   {
+     return __bar;
+   }
+   versioned_symbol (libc, __real_foo, foo, GLIBC_2_1);
+   libc_hidden_ver (__real_foo, foo)  */
+
+#if defined SHARED && defined DO_VERSIONING \
+    && defined HAVE_BROKEN_ALIAS_ATTRIBUTE
+# ifndef __ASSEMBLER__
+#  ifdef HAVE_BROKEN_VISIBILITY_ATTRIBUTE
+#   define __hidden_proto_hiddenattr
+#  else
+#   define __hidden_proto_hiddenattr attribute_hidden
+#  endif
+#  ifndef HAVE_BROKEN_ALIAS_ATTRIBUTE
+#   define hidden_proto(name) __hidden_proto (name, __GI_##name)
+#  else
+#   define hidden_proto(name)
+#  endif
+#  define __hidden_proto(name, internal) \
+  __typeof (name) internal; \
+  __typeof (name) name __asm__ (__hidden_asmname (#internal)) \
+  __hidden_proto_hiddenattr;
+#  define __hidden_asmname(name) \
+  __hidden_asmname1 (__USER_LABEL_PREFIX__, name)
+#  define __hidden_asmname1(prefix, name) __hidden_asmname2(prefix, name)
+#  define __hidden_asmname2(prefix, name) #prefix name
+#  ifdef HAVE_ASM_SET_DIRECTIVE
+#   define __hidden_def1(original, alias)			\
+  ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias) ASM_LINE_SEP	\
+  .set C_SYMBOL_NAME (alias), C_SYMBOL_NAME (original)
+#  else
+#   ifdef HAVE_ASM_GLOBAL_DOT_NAME
+#    define __hidden_def1(original, alias)			\
+  ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias) ASM_LINE_SEP	\
+  C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original) ASM_LINE_SEP	\
+  ASM_GLOBAL_DIRECTIVE C_SYMBOL_DOT_NAME (alias) ASM_LINE_SEP	\
+  C_SYMBOL_DOT_NAME (alias) = C_SYMBOL_DOT_NAME (original)
+#   else
+#    define __hidden_def1(original, alias)			\
+  ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias) ASM_LINE_SEP	\
+  C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original)
+#   endif
+#  endif
+#  define __hidden_def2(...) #__VA_ARGS__
+#  define __hidden_def3(...) __hidden_def2 (__VA_ARGS__)
+#  define hidden_def(name)					\
+  __asm__ (__hidden_def3 (__hidden_def1 (__GI_##name, name)));
+#  define hidden_ver(local, name)				\
+  __asm__ (__hidden_def3 (__hidden_def1 (local, __GI_##name)));
+#  ifdef HAVE_WEAK_SYMBOLS
+#   ifdef HAVE_ASM_WEAKEXT_DIRECTIVE
+#    define __hidden_weak1(original, alias)			\
+  .weakext C_SYMBOL_NAME (alias), C_SYMBOL_NAME (original)
+#   else /* ! HAVE_ASM_WEAKEXT_DIRECTIVE */
+#    ifdef HAVE_ASM_GLOBAL_DOT_NAME
+#     define __hidden_weak1(original, alias)			\
+  .weak C_SYMBOL_NAME (alias) ASM_LINE_SEP			\
+  C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original) ASM_LINE_SEP	\
+  ASM_GLOBAL_DIRECTIVE C_SYMBOL_DOT_NAME (alias) ASM_LINE_SEP	\
+  C_SYMBOL_DOT_NAME (alias) = C_SYMBOL_DOT_NAME (original)
+#    else
+#     define __hidden_weak1(original, alias)			\
+  .weak C_SYMBOL_NAME (alias) ASM_LINE_SEP			\
+  C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original)
+#    endif
+#   endif
+#   define hidden_weak(name)					\
+  __asm__ (__hidden_def3 (__hidden_weak1 (__GI_##name, name)));
+#  else
+#   define hidden_weak(name) hidden_def (name)
+#  endif
+# else
+/* For assembly, we need to do the opposite of what we do in C:
+   in assembly gcc __REDIRECT stuff is not in place, so functions
+   are defined by its normal name and we need to create the
+   __GI_* alias to it, in C __REDIRECT causes the function definition
+   to use __GI_* name and we need to add alias to the real name.
+   hidden_proto and hidden_weak don't make sense for assembly.  */
+#  define hidden_def(name) strong_alias (name, __GI_##name)
+#  define hidden_ver(local, name) strong_alias (local, __GI_##name)
+# endif
+#else
+# ifndef __ASSEMBLY__
+#  define hidden_proto(name)
+#  define hidden_weak(name)
+# endif
+# define hidden_def(name)
+# define hidden_ver(local, name)
+#endif
+
+#if !defined NOT_IN_libc && !defined HAVE_BROKEN_ALIAS_ATTRIBUTE
+# define libc_hidden_proto(name) hidden_proto (name)
+# define libc_hidden_def(name) hidden_def (name)
+# define libc_hidden_weak(name) hidden_weak (name)
+# define libc_hidden_ver(local, name) hidden_ver (local, name)
+#else
+# define libc_hidden_proto(name)
+# define libc_hidden_def(name)
+# define libc_hidden_weak(name)
+# define libc_hidden_ver(local, name)
+#endif
+
+#if defined NOT_IN_libc && defined IS_IN_rtld \
+    && !defined HAVE_BROKEN_ALIAS_ATTRIBUTE
+# define rtld_hidden_proto(name) hidden_proto (name)
+# define rtld_hidden_def(name) hidden_def (name)
+# define rtld_hidden_weak(name) hidden_weak (name)
+# define rtld_hidden_ver(local, name) hidden_ver (local, name)
+#else
+# define rtld_hidden_proto(name)
+# define rtld_hidden_def(name)
+# define rtld_hidden_weak(name)
+# define rtld_hidden_ver(local, name)
+#endif
+
+#if defined NOT_IN_libc && defined IS_IN_libm \
+    && !defined HAVE_BROKEN_ALIAS_ATTRIBUTE
+# define libm_hidden_proto(name) hidden_proto (name)
+# define libm_hidden_def(name) hidden_def (name)
+# define libm_hidden_weak(name) hidden_weak (name)
+# define libm_hidden_ver(local, name) hidden_ver (local, name)
+#else
+# define libm_hidden_proto(name)
+# define libm_hidden_def(name)
+# define libm_hidden_weak(name)
+# define libm_hidden_ver(local, name)
+#endif
+
 #endif /* libc-symbols.h */