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0923f74ada
glibc/include
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Florian Weimer 0923f74ada Support for multiple versions in versioned_symbol, compat_symbol 
This essentially folds compat_symbol_unique functionality into
compat_symbol.

This change eliminates the need for intermediate aliases for defining
multiple symbol versions, for both compat_symbol and versioned_symbol.
Some binutils versions do not suport multiple versions per symbol on
some targets, so aliases are automatically introduced, similar to what
compat_symbol_unique did.  To reduce symbol table sizes, a configure
check is added to avoid these aliases if they are not needed.

The new mechanism works with data symbols as well as function symbols,
due to the way an assembler-level redirect is used.  It is not
compatible with weak symbols for old binutils versions, which is why
the definition of __malloc_initialize_hook had to be changed.  This
is not a loss of functionality because weak symbols do not matter
to dynamic linking.

The placeholder symbol needs repeating in nptl/libpthread-compat.c
now that compat_symbol is used, but that seems more obvious than
introducing yet another macro.

A subtle difference was that compat_symbol_unique made the symbol
global automatically.  compat_symbol does not do this, so static
had to be removed from the definition of
__libpthread_version_placeholder.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
2021-03-25 12:33:02 +01:00
..
arpa CVE-2016-10739: getaddrinfo: Fully parse IPv4 address strings [BZ #20018] 2019-01-21 21:26:03 +01:00
bits sysconf: Add _SC_MINSIGSTKSZ/_SC_SIGSTKSZ [BZ #20305] 2021-02-01 11:00:52 -08:00
gnu Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
net Fix resolver if_* namespace (bug 17717). 2014-12-16 18:18:49 +00:00
netinet nss_files: Consolidate line parse declarations in <nss_files.h> 2020-07-21 07:33:20 +02:00
programs Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
protocols
rpc Handle out-of-memory case in svc_tcp.c/svc_unix.c:rendezvous_request. 2020-12-10 11:11:20 +01:00
rpcsvc Remove --enable-obsolete-nsl configure flag 2020-07-08 17:25:57 +02:00
sys linux: Consolidate statvfs implementations 2021-02-11 08:00:41 -03:00
aio.h y2038: Convert aio_suspend to support 64 bit time 2020-11-30 14:08:44 +01:00
aliases.h Remove --enable-obsolete-nsl configure flag 2020-07-08 17:25:57 +02:00
alloc_buffer.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
alloca.h Remove macros extend_alloca, extend_alloca_account [BZ #18023] 2018-06-27 19:20:37 +02:00
allocate_once.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
ar.h Add missing header wrappers under include/ 2019-02-16 08:25:16 +01:00
argp-fmtstream.h Mark internal argp functions with attribute_hidden [BZ #18822] 2017-10-01 15:10:27 -07:00
argp.h ldbl-opt: Add argp_error and argp_failure (bug 23983) 2019-03-01 15:21:32 -03:00
argz.h Use libc_hidden_* for argz_next, __argz_next (bug 15105). 2018-02-15 21:00:02 +00:00
array_length.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
assert.h Introduce NO_RTLD_HIDDEN, make hurd use it instead of NO_HIDDEN 2017-10-03 01:33:38 +02:00
atomic.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
byteswap.h
complex.h float128: Add private _Float128 declarations for libm. 2017-05-15 10:23:28 -03:00
cpio.h Add more headers to include/ for conform tests. 2014-12-11 21:41:30 +00:00
crypt.h Add include/crypt.h. 2016-10-28 22:40:16 -04:00
ctype.h Use libc_hidden_* for tolower, toupper (bug 15105). 2018-02-23 13:54:53 +00:00
des.h
dirent.h hurd: keep only required PLTs in ld.so 2020-11-11 02:36:22 +01:00
dlfcn.h Remove --enable-obsolete-nsl configure flag 2020-07-08 17:25:57 +02:00
dso_handle.h Mark __dso_handle as hidden [BZ #18822] 2017-09-26 16:53:44 -07:00
elf.h elf: Refuse to dlopen PIE objects [BZ #24323] 2019-06-18 16:42:10 +02:00
endian.h
envz.h Installed header hygiene (BZ#20366): Test of installed headers. 2016-09-23 08:43:56 -04:00
err.h ldbl-128ibm-compat: PLT redirects for using ldbl redirects internally 2020-03-25 14:34:23 -05:00
errno.h Remove tls.h inclusion from internal errno.h 2020-11-13 12:59:19 -03:00
error.h ldbl-opt: Add error and error_at_line (bug 23984) 2019-03-01 15:26:36 -03:00
execinfo.h Installed header hygiene (BZ#20366): Test of installed headers. 2016-09-23 08:43:56 -04:00
fcntl.h Fix Linux fcntl OFD locks for non-LFS architectures (BZ#20251) 2018-06-26 13:22:53 -03:00
features.h sysconf: Add _SC_MINSIGSTKSZ/_SC_SIGSTKSZ [BZ #20305] 2021-02-01 11:00:52 -08:00
fenv.h Move fenv.h soft-float inlines from fenv_private.h to include/fenv.h. 2018-09-04 19:52:06 +00:00
file_change_detection.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
filename.h Import filename.h from gnulib 2021-01-05 11:33:16 -03:00
float.h Make totalorder and totalordermag functions take pointer arguments. 2019-08-15 15:18:34 +00:00
fmtmsg.h Add more headers to include/ for conform tests. 2014-12-11 21:41:30 +00:00
fnmatch.h First steps to get conformtest fully working 2012-02-25 23:18:39 -05:00
fpu_control.h Hide internal __setfpucw function [BZ #18822] 2017-10-01 17:52:15 -07:00
fstab.h Add missing header wrappers under include/ 2019-02-16 08:25:16 +01:00
fts.h Add missing header wrappers under include/ 2019-02-16 08:25:16 +01:00
ftw.h
gconv.h
getopt_int.h Update. 2004-03-09 10:36:53 +00:00
getopt.h getopt: remove USE_NONOPTION_FLAGS 2017-04-07 07:45:53 -04:00
glob.h Hide internal __glob64 function [BZ #18822] 2017-10-01 18:02:10 -07:00
gmp.h Mark internal gmp functions with attribute_hidden [BZ #18822] 2017-10-01 15:15:30 -07:00
gnu-versions.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
grp-merge.h NSS: Implement group merging support. 2016-04-29 22:18:21 -04:00
grp.h nss_files: Consolidate line parse declarations in <nss_files.h> 2020-07-21 07:33:20 +02:00
gshadow.h nss_files: Consolidate line parse declarations in <nss_files.h> 2020-07-21 07:33:20 +02:00
iconv.h
idx.h Import idx.h from gnulib 2021-01-05 11:33:16 -03:00
ifaddrs.h hurd: Fix getifaddrs' and freeifaddrs' symbol exposition 2017-09-28 01:05:18 +02:00
ifreq.h Hide internal __ifreq function [BZ #18822] 2017-10-01 17:35:46 -07:00
ifunc-impl-list.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
inline-hashtab.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
intprops.h Sync intprops.h with gnulib 2021-01-04 08:42:04 -03:00
inttypes.h Make strtoimax, strtoumax, wcstoimax, wcstoumax into aliases 2020-12-08 18:15:27 +00:00
langinfo.h Add first fixes for conformtest for POSIX2008 2012-02-26 21:32:56 -05:00
lastlog.h Add missing header wrappers under include/ 2019-02-16 08:25:16 +01:00
libc-diag.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
libc-internal.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
libc-pointer-arith.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
libc-symbols.h Support for multiple versions in versioned_symbol, compat_symbol 2021-03-25 12:33:02 +01:00
libgen.h
libintl.h Document the internal _ and N_ macros 2020-05-06 17:35:40 +02:00
limits.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
link.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
list_t.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
list.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
locale.h First steps to get conformtest fully working 2012-02-25 23:18:39 -05:00
loop_unroll.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
malloc.h malloc: Basic support for memory tagging in the malloc() family 2020-12-21 15:25:25 +00:00
math-narrow-eval.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
math.h float128: use builtin_signbitf128 always 2020-05-04 13:18:45 -05:00
mcheck.h Installed header hygiene (BZ#20366): Test of installed headers. 2016-09-23 08:43:56 -04:00
memory.h
mntent.h Hide internal __hasmntopt function [BZ #18822] 2017-10-01 17:37:42 -07:00
monetary.h Rename __LONG_DOUBLE_USES_FLOAT128 to __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI 2020-04-30 08:52:08 -05:00
mqueue.h y2038: linux: Provide __mq_timedreceive_time64 implementation 2020-04-06 23:05:11 +02:00
netdb.h y2038: Convert gai_suspend to support 64 bit time 2020-12-04 10:04:38 +01:00
netgroup.h
nl_types.h
nss_files.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
nss.h nss: Export nscd hash function as __nss_hash [BZ #22459] 2017-11-23 14:08:11 +01:00
nsswitch.h
obstack.h Installed header hygiene (BZ#20366): Test of installed headers. 2016-09-23 08:43:56 -04:00
plural-exp.h Hide internal __gettextparse function [BZ #18822] 2017-10-01 17:31:05 -07:00
poll.h
printf.h Rename __LONG_DOUBLE_USES_FLOAT128 to __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI 2020-04-30 08:52:08 -05:00
pthread.h Fix mq_notify pthread_barrier_* namespace (bug 18544). 2015-06-17 20:16:56 +00:00
pty.h Installed header hygiene (BZ#20366): Test of installed headers. 2016-09-23 08:43:56 -04:00
pwd.h nss_files: Consolidate line parse declarations in <nss_files.h> 2020-07-21 07:33:20 +02:00
random-bits.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
re_comp.h Add missing header wrappers under include/ 2019-02-16 08:25:16 +01:00
regex.h Hide internal regex functions [BZ #18822] 2017-10-01 15:53:15 -07:00
regexp.h Add missing header wrappers under include/ 2019-02-16 08:25:16 +01:00
register-atfork.h posix: Consolidate register-atfork 2021-03-12 10:19:22 -03:00
resolv.h Obsolete p_secstodate. 2017-11-22 22:21:10 +00:00
rounding-mode.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
rtld-malloc.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
sched.h Add hidden prototypes for __sched_getparam, __sched_getscheduler 2020-02-20 08:57:01 +01:00
scratch_buffer.h malloc: Add scratch_buffer_dupfree 2021-01-05 11:33:16 -03:00
search.h misc: Add twalk_r function 2019-05-02 11:42:51 +02:00
set-hooks.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
setjmp.h hurd: keep only required PLTs in ld.so 2020-11-11 02:36:22 +01:00
sgtty.h
shadow.h nss_files: Consolidate line parse declarations in <nss_files.h> 2020-07-21 07:33:20 +02:00
shlib-compat.h Support for multiple versions in versioned_symbol, compat_symbol 2021-03-25 12:33:02 +01:00
shm-directory.h linux: Require /dev/shm as the shared memory file system 2021-02-08 14:10:42 -03:00
signal.h hurd: keep only required PLTs in ld.so 2020-11-11 02:36:22 +01:00
spawn.h posix: Use posix_spawn for wordexp 2019-10-09 17:48:41 -03:00
stab.h
stackinfo.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
stap-probe.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
stdc-predef.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
stdint.h Move inttypes.h and stdint.h to stdlib. 2019-03-13 09:42:09 -04:00
stdio_ext.h Installed header hygiene (BZ#20366): Test of installed headers. 2016-09-23 08:43:56 -04:00
stdio.h libio: Remove __libc_readline_unlocked 2020-07-21 07:34:50 +02:00
stdlib.h hurd: keep only required PLTs in ld.so 2020-11-11 02:36:22 +01:00
string.h string: Enable __FORTIFY_LEVEL=3 2020-12-31 16:55:21 +05:30
strings.h
struct___timeb64.h time: Add 64-bit time_t support for ftime 2020-10-27 09:54:50 -03:00
struct___timespec64.h y2038: include: Move struct __timespec64 definition to a separate file 2020-04-06 23:05:11 +02:00
struct___timeval64.h y2038: include: Move struct __timeval64 definition to a separate file 2020-05-05 19:36:25 +02:00
stubs-prologue.h
syscall.h
sysexits.h
syslog.h
tar.h
termios.h Hide internal __tcgetattr function [BZ #18822] 2017-10-01 17:48:24 -07:00
tgmath.h
time.h y2038: linux: Provide __time64 implementation 2020-10-19 16:01:37 +02:00
ttyent.h Installed header hygiene (BZ#20366): Test of installed headers. 2016-09-23 08:43:56 -04:00
uchar.h First steps to get conformtest fully working 2012-02-25 23:18:39 -05:00
ucontext.h
ulimit.h First steps to get conformtest fully working 2012-02-25 23:18:39 -05:00
unistd.h hurd: keep only required PLTs in ld.so 2020-11-11 02:36:22 +01:00
utime.h First steps to get conformtest fully working 2012-02-25 23:18:39 -05:00
utmp.h Mark internal utmp functions with attribute_hidden [BZ #18822] 2017-10-01 15:51:56 -07:00
values.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
verify.h posix: Sync regex with gnulib 2019-11-06 09:20:52 -03:00
wait.h Add missing header wrappers under include/ 2019-02-16 08:25:16 +01:00
wchar.h Rename __LONG_DOUBLE_USES_FLOAT128 to __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI 2020-04-30 08:52:08 -05:00
wctype.h Remove __need macros from stdio.h and wchar.h. 2017-06-08 13:58:17 -04:00
wordexp.h First steps to get conformtest fully working 2012-02-25 23:18:39 -05:00