nptl: Remove vfork IFUNC-based forwarder from libpthread [BZ #20188]
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  • nptl: Remove vfork IFUNC-based forwarder from libpthread [BZ #20188]
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Commit Message

Florian Weimer June 28, 2019, 3 p.m. UTC
With commit f0b2132b35248c1f4a80f62a2c38cddcc802aa8c ("ld.so:
Support moving versioned symbols between sonames [BZ #24741]"), the
dynamic linker will find the definition of vfork in libc and binds
a vfork reference to that symbol, even if the soname in the version
reference says that the symbol should be located in libpthread.

As a result, the forwarder (whether it's IFUNC-based or a duplicate
of the libc implementation) is no longer necessary.

On older architectures, a placeholder symbol is required, to make
sure that the GLIBC_2.1.2 symbol version does not go away, or is
turned in to a weak symbol definition by the link editor.

mips32 is an outlier: It defined __vfork@@GLIBC_2.2, but the
baseline is GLIBC_2.0.  Since there are other @@GLIBC_2.2 symbols,
the placeholder symbol is not needed there.

(I tested this on i386 and with a build-many-glibcs.py run.  I tried to
verify manually that libc.so provides the same symbol versions as the
removed ones.  We already removed all the other IFUNC forwarders which
were originally there, and vfork was the only remaining case where we
had a user-visible bug.  Therefore, removing the remaining forwarders is
just a further cleanup, not a functional change.)

2019-06-28  Florian Weimer  <fweimer@redhat.com>

	[BZ #20188]
	* nptl/Versions (libpthread): Remove __fork from GLIBC_2.0.
	Replace __vfork with __libpthread_version_placeholder for
	GLIBC_2.1.2.
	(libc): Remove __libc_vfork from GLIBC_PRIVATE.
	* nptl/Makefile (libpthread-routines): Remove pt-vfork.  Add
	libpthread-compat.
	* nptl/pt-vfork.c: Remove file.
	* sysdeps/unix/sysv/linux/aarch64/pt-vfork.c: Likewise.
	* sysdeps/unix/sysv/linux/alpha/pt-vfork.S: Likewise.
	* sysdeps/unix/sysv/linux/csky/pt-vfork.S: Likewise.
	* sysdeps/unix/sysv/linux/hppa/pt-vfork.S: Likewise.
	* sysdeps/unix/sysv/linux/ia64/pt-vfork.S: Likewise.
	* sysdeps/unix/sysv/linux/m68k/pt-vfork.c: Likewise.
	* sysdeps/unix/sysv/linux/microblaze/pt-vfork.S: Likewise.
	* sysdeps/unix/sysv/linux/mips/pt-vfork.S: Likewise.
	* sysdeps/unix/sysv/linux/nios2/pt-vfork.S: Likewise.
	* sysdeps/unix/sysv/linux/riscv/pt-vfork.S: Likewise.
	* sysdeps/unix/sysv/linux/s390/pt-vfork.S: Likewise.
	* sysdeps/unix/sysv/linux/sh/pt-vfork.S: Likewise.
	* sysdeps/unix/sysv/linux/sparc/pt-vfork.S: Likewise.
	* sysdeps/unix/sysv/linux/aarch64/libpthread.abilist (GLIBC_2.17):
	Remove vfork, __vfork.
	* sysdeps/unix/sysv/linux/alpha/libpthread.abilist (GLIBC_2.0):
	Remove vfork.
	(GLIBC_2.1.2): Replace __vfork with
	__libpthread_version_placeholder.
	* sysdeps/unix/sysv/linux/arm/libpthread.abilist (GLIBC_2.4):
	Remove vfork, __vfork.
	* sysdeps/unix/sysv/linux/hppa/libpthread.abilist (GLIBC_2.2):
	Likewise.
	* sysdeps/unix/sysv/linux/i386/libpthread.abilist (GLIBC_2.0):
	Remove vfork.
	(GLIBC_2.1.2): Replace __vfork with
	__libpthread_version_placeholder.
	* sysdeps/unix/sysv/linux/ia64/libpthread.abilist (GLIBC_2.2):
	Remove vfork.
	* sysdeps/unix/sysv/linux/m68k/coldfire/libpthread.abilist
	(GLIBC_2.4): Remove vfork, __vfork.
	* sysdeps/unix/sysv/linux/m68k/m680x0/libpthread.abilist
	(GLIBC_2.0): Remove vfork.
	(GLIBC_2.1.2): Replace __vfork with
	__libpthread_version_placeholder.
	* sysdeps/unix/sysv/linux/microblaze/libpthread.abilist
	(GLIBC_2.18): Remove vfork, __vfork.
	* sysdeps/unix/sysv/linux/mips/mips32/libpthread.abilist
	(GLIBC_2.0): Remove vfork.
	(GLIBC_2.2): Remove __vfork.
	* sysdeps/unix/sysv/linux/mips/mips64/libpthread.abilist:
	(GLIBC_2.2): Remove vfork, __vfork.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/libpthread.abilist:
	(GLIBC_2.0): Remove vfork.
	(GLIBC_2.1.2): Replace __vfork with
	__libpthread_version_placeholder.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libpthread.abilist
	(GLIBC_2.3): Remove vfork, __vfork.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libpthread.abilist
	(GLIBC_2.17): Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-32/libpthread.abilist
	(GLIBC_2.0): Remove vfork.
	(GLIBC_2.1.2): Replace __vfork with
	__libpthread_version_placeholder.
	* sysdeps/unix/sysv/linux/s390/s390-64/libpthread.abilist
	(GLIBC_2.2): Remove vfork, __vfork.
	* sysdeps/unix/sysv/linux/sh/libpthread.abilist (GLIBC_2.2):
	Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc32/libpthread.abilist
	(GLIBC_2.0): Remove vfork.
	(GLIBC_2.1.2): Replace __vfork with
	__libpthread_version_placeholder.
	* sysdeps/unix/sysv/linux/sparc/sparc64/libpthread.abilist
	(GLIBC_2.2): Remove vfork, __vfork.
	* sysdeps/unix/sysv/linux/x86_64/64/libpthread.abilist
	(GLIBC_2.2.5): Likewise.
	* sysdeps/unix/sysv/linux/x86_64/x32/libpthread.abilist
	(GLIBC_2.16): Likewise.
	* sysdeps/unix/sysv/linux/hppa/localplt.data (libpthread.so):
	Remove __errno_location.

Comments

Zack Weinberg June 28, 2019, 7:44 p.m. UTC | #1
On Fri, Jun 28, 2019 at 11:00 AM Florian Weimer <fweimer@redhat.com> wrote:
> With commit f0b2132b35248c1f4a80f62a2c38cddcc802aa8c ("ld.so:
> Support moving versioned symbols between sonames [BZ #24741]"), the
> dynamic linker will find the definition of vfork in libc and binds
> a vfork reference to that symbol, even if the soname in the version
> reference says that the symbol should be located in libpthread.
>
> As a result, the forwarder (whether it's IFUNC-based or a duplicate
> of the libc implementation) is no longer necessary.
>
> On older architectures, a placeholder symbol is required, to make
> sure that the GLIBC_2.1.2 symbol version does not go away, or is
> turned in to a weak symbol definition by the link editor.

Can you explain why it is necessary to preserve the GLIBC_2.1.2 symbol
version in libpthread, even though no normal symbols use that version
anymore?  (I assume this is about the special symbol defining the
version itself -- "A GLIBC_2.1.2@@GLIBC_2.1.2" in nm output?)

Otherwise LGTM.

zw
Florian Weimer June 28, 2019, 8:15 p.m. UTC | #2
* Zack Weinberg:

> On Fri, Jun 28, 2019 at 11:00 AM Florian Weimer <fweimer@redhat.com> wrote:
>> With commit f0b2132b35248c1f4a80f62a2c38cddcc802aa8c ("ld.so:
>> Support moving versioned symbols between sonames [BZ #24741]"), the
>> dynamic linker will find the definition of vfork in libc and binds
>> a vfork reference to that symbol, even if the soname in the version
>> reference says that the symbol should be located in libpthread.
>>
>> As a result, the forwarder (whether it's IFUNC-based or a duplicate
>> of the libc implementation) is no longer necessary.
>>
>> On older architectures, a placeholder symbol is required, to make
>> sure that the GLIBC_2.1.2 symbol version does not go away, or is
>> turned in to a weak symbol definition by the link editor.
>
> Can you explain why it is necessary to preserve the GLIBC_2.1.2 symbol
> version in libpthread, even though no normal symbols use that version
> anymore?  (I assume this is about the special symbol defining the
> version itself -- "A GLIBC_2.1.2@@GLIBC_2.1.2" in nm output?)

Three reasons:

The dynamic linker performs a version coverage check for all Verneed
records at load time.  This allows detection of potentially missing
symbols even when lazy binding is used.  If we drop the GLIBC_2.1.2
symbol when it was there before, old binaries will fail to load.

Our Versions file processing logic drops empty version clauses from the
generated version script (but the preprocessor macros are still
generated).

If BFD ld sees a version script which has empty versions, very strange
things happen.  It generates a shared object with Verdef records with
VER_FLG_WEAK.  Linking against such objects causing BFD ld to produce
objects with Vernaux records with VER_FLG_WEAK flag.  This I recall from
investigating this bug:

  <https://sourceware.org/bugzilla/show_bug.cgi?id=24718>

I didn't fully explore the consequences of that.  It's definitely not a
well-tested area of the linker and loader, so I decided to side-step the
issue.

> Otherwise LGTM.

Thanks!

Florian
Zack Weinberg June 28, 2019, 8:23 p.m. UTC | #3
On Fri, Jun 28, 2019 at 4:15 PM Florian Weimer <fweimer@redhat.com> wrote:

> The dynamic linker performs a version coverage check for all Verneed
> records at load time.  This allows detection of potentially missing
> symbols even when lazy binding is used.  If we drop the GLIBC_2.1.2
> symbol when it was there before, old binaries will fail to load.
>
> Our Versions file processing logic drops empty version clauses from the
> generated version script (but the preprocessor macros are still
> generated).
>
> If BFD ld sees a version script which has empty versions, very strange
> things happen.  It generates a shared object with Verdef records with
> VER_FLG_WEAK.  Linking against such objects causing BFD ld to produce
> objects with Vernaux records with VER_FLG_WEAK flag.  This I recall from
> investigating this bug:
>
>   <https://sourceware.org/bugzilla/show_bug.cgi?id=24718>
>
> I didn't fully explore the consequences of that.

All right, then I'm going to say that this patch is OK provided you
explain in the commit message that dropping the GLIBC_2.1.2 symbol
will make old binaries fail to load.  That seems like the most
important reason.

zw
Florian Weimer June 28, 2019, 8:42 p.m. UTC | #4
* Zack Weinberg:

> On Fri, Jun 28, 2019 at 4:15 PM Florian Weimer <fweimer@redhat.com> wrote:
>
>> The dynamic linker performs a version coverage check for all Verneed
>> records at load time.  This allows detection of potentially missing
>> symbols even when lazy binding is used.  If we drop the GLIBC_2.1.2
>> symbol when it was there before, old binaries will fail to load.
>>
>> Our Versions file processing logic drops empty version clauses from the
>> generated version script (but the preprocessor macros are still
>> generated).
>>
>> If BFD ld sees a version script which has empty versions, very strange
>> things happen.  It generates a shared object with Verdef records with
>> VER_FLG_WEAK.  Linking against such objects causing BFD ld to produce
>> objects with Vernaux records with VER_FLG_WEAK flag.  This I recall from
>> investigating this bug:
>>
>>   <https://sourceware.org/bugzilla/show_bug.cgi?id=24718>
>>
>> I didn't fully explore the consequences of that.
>
> All right, then I'm going to say that this patch is OK provided you
> explain in the commit message that dropping the GLIBC_2.1.2 symbol
> will make old binaries fail to load.  That seems like the most
> important reason.

Oh.  I honestly didn't realize that it wasn't obvious.  Thanks for the
feedback.  Our users get this error (“/path/to/program:
/lib64/libc.so.6: version `GLIBC_2.14' not found (required by
/path/to/program)”) all the time when they try to run current binaries
on glibc 2.12 or glibc 2.17.

Florian
Zack Weinberg June 28, 2019, 9:13 p.m. UTC | #5
On Fri, Jun 28, 2019 at 4:42 PM Florian Weimer <fweimer@redhat.com> wrote:
> > All right, then I'm going to say that this patch is OK provided you
> > explain in the commit message that dropping the GLIBC_2.1.2 symbol
> > will make old binaries fail to load.  That seems like the most
> > important reason.
>
> Oh.  I honestly didn't realize that it wasn't obvious.  Thanks for the
> feedback.  Our users get this error (“/path/to/program:
> /lib64/libc.so.6: version `GLIBC_2.14' not found (required by
> /path/to/program)”) all the time when they try to run current binaries
> on glibc 2.12 or glibc 2.17.

Yeah, that's not an error I can remember seeing myself :shrug:

zw
Florian Weimer July 2, 2019, 3:06 p.m. UTC | #6
* Zack Weinberg:

> On Fri, Jun 28, 2019 at 4:15 PM Florian Weimer <fweimer@redhat.com> wrote:
>
>> The dynamic linker performs a version coverage check for all Verneed
>> records at load time.  This allows detection of potentially missing
>> symbols even when lazy binding is used.  If we drop the GLIBC_2.1.2
>> symbol when it was there before, old binaries will fail to load.
>>
>> Our Versions file processing logic drops empty version clauses from the
>> generated version script (but the preprocessor macros are still
>> generated).
>>
>> If BFD ld sees a version script which has empty versions, very strange
>> things happen.  It generates a shared object with Verdef records with
>> VER_FLG_WEAK.  Linking against such objects causing BFD ld to produce
>> objects with Vernaux records with VER_FLG_WEAK flag.  This I recall from
>> investigating this bug:
>>
>>   <https://sourceware.org/bugzilla/show_bug.cgi?id=24718>
>>
>> I didn't fully explore the consequences of that.
>
> All right, then I'm going to say that this patch is OK provided you
> explain in the commit message that dropping the GLIBC_2.1.2 symbol
> will make old binaries fail to load.  That seems like the most
> important reason.

I've pushed this now, after fixing bug 24757 which turned up late as a
blocker.

Thanks,
Florian

Patch
diff mbox series

diff --git a/nptl/Makefile b/nptl/Makefile
index de312b3477..d23a235581 100644
--- a/nptl/Makefile
+++ b/nptl/Makefile
@@ -120,7 +120,7 @@  libpthread-routines = nptl-init nptlfreeres vars events version pt-interp \
 		      cancellation \
 		      lowlevellock \
 		      lll_timedlock_wait \
-		      pt-fork pt-vfork pt-fcntl \
+		      pt-fork pt-fcntl \
 		      $(pthread-compat-wrappers) \
 		      pt-raise pt-system \
 		      flockfile ftrylockfile funlockfile \
@@ -144,7 +144,8 @@  libpthread-routines = nptl-init nptlfreeres vars events version pt-interp \
 		      mtx_destroy mtx_init mtx_lock mtx_timedlock \
 		      mtx_trylock mtx_unlock call_once cnd_broadcast \
 		      cnd_destroy cnd_init cnd_signal cnd_timedwait cnd_wait \
-		      tss_create tss_delete tss_get tss_set pthread_mutex_conf
+		      tss_create tss_delete tss_get tss_set pthread_mutex_conf \
+		      libpthread-compat
 #		      pthread_setuid pthread_seteuid pthread_setreuid \
 #		      pthread_setresuid \
 #		      pthread_setgid pthread_setegid pthread_setregid \
diff --git a/nptl/Versions b/nptl/Versions
index e7f691da7a..6007fd03e7 100644
--- a/nptl/Versions
+++ b/nptl/Versions
@@ -36,7 +36,6 @@  libc {
     __libc_alloca_cutoff;
     # Internal libc interface to libpthread
     __libc_dl_error_tsd;
-    __libc_vfork;
     __libc_pthread_init;
     __libc_current_sigrtmin_private; __libc_current_sigrtmax_private;
     __libc_allocate_rtsig_private;
@@ -98,7 +97,7 @@  libpthread {
     sem_destroy; sem_getvalue; sem_init; sem_post; sem_trywait; sem_wait;
 
     # Special fork handling.
-    fork; __fork; vfork;
+    fork; __fork;
 
     # Cancellation points.
     close; __close; fcntl; __fcntl; read; __read; write; __write; accept;
@@ -152,7 +151,7 @@  libpthread {
   }
 
   GLIBC_2.1.2 {
-    __vfork;
+    __libpthread_version_placeholder;
   }
 
   GLIBC_2.2 {
diff --git a/nptl/libpthread-compat.c b/nptl/libpthread-compat.c
new file mode 100644
index 0000000000..ea29e9f47b
--- /dev/null
+++ b/nptl/libpthread-compat.c
@@ -0,0 +1,37 @@ 
+/* Placeholder definitions to pull in removed symbol versions.
+   Copyright (C) 2019 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 Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <shlib-compat.h>
+
+/* This is an unused compatibility symbol definition, to prevent ld
+   from creating a weak version definition for GLIBC_2.1.2.  (__vfork
+   used to be defined at that version, but it is now provided by libc,
+   and there are no versions left in libpthread for that symbol
+   version.)  If the ABI baseline for glibc is the GLIBC_2.2 symbol
+   version or later, the placeholder symbol is not needed because
+   there are plenty of other symbols which populate those later
+   versions.  */
+#if (SHLIB_COMPAT (libpthread, GLIBC_2_1_2, GLIBC_2_2))
+void
+attribute_compat_text_section
+__libpthread_version_placeholder (void)
+{
+}
+compat_symbol (libpthread, __libpthread_version_placeholder,
+               __libpthread_version_placeholder, GLIBC_2_1_2);
+#endif
diff --git a/nptl/pt-vfork.c b/nptl/pt-vfork.c
deleted file mode 100644
index 3676977669..0000000000
--- a/nptl/pt-vfork.c
+++ /dev/null
@@ -1,65 +0,0 @@ 
-/* vfork ABI-compatibility entry points for libpthread.
-   Copyright (C) 2014-2019 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 Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 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
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
-
-#include <unistd.h>
-#include <shlib-compat.h>
-
-/* libpthread used to have its own vfork implementation that differed
-   from libc's only in having a pointless micro-optimization.  There
-   is no longer any use to having a separate copy in libpthread, but
-   the historical ABI requires it.  For static linking, there is no
-   need to provide anything here--the libc version will be linked in.
-   For shared library ABI compatibility, there must be __vfork and
-   vfork symbols in libpthread.so; so we define them using IFUNC to
-   redirect to the libc function.  */
-
-/* Note! If the architecture doesn't support IFUNC, then we need an
-   alternate target-specific mechanism to implement this.  So we just
-   assume IFUNC here and require that the target override this file
-   if necessary.
-
-   If the architecture can assume all supported versions of gcc will
-   produce a tail-call to __libc_vfork, consider including the version
-   in sysdeps/unix/sysv/linux/aarch64/pt-vfork.c.  */
-
-#if !HAVE_IFUNC
-# error "must write pt-vfork for this machine or get IFUNC support"
-#endif
-
-#if (SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_20) \
-     || SHLIB_COMPAT (libpthread, GLIBC_2_1_2, GLIBC_2_20))
-
-extern __typeof (vfork) __libc_vfork;   /* Defined in libc.  */
-
-# undef INIT_ARCH
-# define INIT_ARCH()
-# define DEFINE_VFORK(name) libc_ifunc (name, &__libc_vfork)
-
-#endif
-
-#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_20)
-extern __typeof(vfork) vfork_ifunc;
-DEFINE_VFORK (vfork_ifunc)
-compat_symbol (libpthread, vfork_ifunc, vfork, GLIBC_2_0);
-#endif
-
-#if SHLIB_COMPAT (libpthread, GLIBC_2_1_2, GLIBC_2_20)
-extern __typeof(vfork) __vfork_ifunc;
-DEFINE_VFORK (__vfork_ifunc)
-compat_symbol (libpthread, __vfork_ifunc, __vfork, GLIBC_2_1_2);
-#endif
diff --git a/sysdeps/unix/sysv/linux/aarch64/libpthread.abilist b/sysdeps/unix/sysv/linux/aarch64/libpthread.abilist
index 9a9e4cee85..6945b7cbe4 100644
--- a/sysdeps/unix/sysv/linux/aarch64/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/aarch64/libpthread.abilist
@@ -45,7 +45,6 @@  GLIBC_2.17 __read F
 GLIBC_2.17 __res_state F
 GLIBC_2.17 __send F
 GLIBC_2.17 __sigaction F
-GLIBC_2.17 __vfork F
 GLIBC_2.17 __wait F
 GLIBC_2.17 __write F
 GLIBC_2.17 _pthread_cleanup_pop F
@@ -216,7 +215,6 @@  GLIBC_2.17 siglongjmp F
 GLIBC_2.17 sigwait F
 GLIBC_2.17 system F
 GLIBC_2.17 tcdrain F
-GLIBC_2.17 vfork F
 GLIBC_2.17 wait F
 GLIBC_2.17 waitpid F
 GLIBC_2.17 write F
diff --git a/sysdeps/unix/sysv/linux/aarch64/pt-vfork.c b/sysdeps/unix/sysv/linux/aarch64/pt-vfork.c
deleted file mode 100644
index 3009f8d2fd..0000000000
--- a/sysdeps/unix/sysv/linux/aarch64/pt-vfork.c
+++ /dev/null
@@ -1,54 +0,0 @@ 
-/* vfork ABI-compatibility entry points for libpthread.
-   Copyright (C) 2014-2019 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 Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 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
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
-
-#include <shlib-compat.h>
-
-/* libpthread used to have its own vfork implementation that differed
-   from libc's only in having a pointless micro-optimization.  There
-   is no longer any use to having a separate copy in libpthread, but
-   the historical ABI requires it.  For static linking, there is no
-   need to provide anything here--the libc version will be linked in.
-   For shared library ABI compatibility, there must be __vfork and
-   vfork symbols in libpthread.so.  */
-
-#if HAVE_IFUNC
-# include <nptl/pt-vfork.c>
-#elif (SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_20) \
-       || SHLIB_COMPAT (libpthread, GLIBC_2_1_2, GLIBC_2_20))
-
-/* Thankfully, on AArch64 we can rely on the compiler generating
-   a tail call here.  */
-
-extern void __libc_vfork (void);
-
-void
-vfork_compat (void)
-{
-  __libc_vfork ();
-}
-
-# if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_20)
-compat_symbol (libpthread, vfork_compat, vfork, GLIBC_2_0);
-# endif
-
-# if SHLIB_COMPAT (libpthread, GLIBC_2_1_2, GLIBC_2_20)
-strong_alias (vfork_compat, vfork_compat2)
-compat_symbol (libpthread, vfork_compat2, __vfork, GLIBC_2_1_2);
-# endif
-
-#endif
diff --git a/sysdeps/unix/sysv/linux/alpha/libpthread.abilist b/sysdeps/unix/sysv/linux/alpha/libpthread.abilist
index b413007ccb..2d9b958efa 100644
--- a/sysdeps/unix/sysv/linux/alpha/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/alpha/libpthread.abilist
@@ -114,7 +114,6 @@  GLIBC_2.0 siglongjmp F
 GLIBC_2.0 sigwait F
 GLIBC_2.0 system F
 GLIBC_2.0 tcdrain F
-GLIBC_2.0 vfork F
 GLIBC_2.0 wait F
 GLIBC_2.0 waitpid F
 GLIBC_2.0 write F
@@ -155,7 +154,7 @@  GLIBC_2.1 sem_wait F
 GLIBC_2.1.1 sem_close F
 GLIBC_2.1.1 sem_open F
 GLIBC_2.1.1 sem_unlink F
-GLIBC_2.1.2 __vfork F
+GLIBC_2.1.2 __libpthread_version_placeholder F
 GLIBC_2.11 pthread_sigqueue F
 GLIBC_2.12 pthread_getname_np F
 GLIBC_2.12 pthread_mutex_consistent F
diff --git a/sysdeps/unix/sysv/linux/alpha/pt-vfork.S b/sysdeps/unix/sysv/linux/alpha/pt-vfork.S
deleted file mode 100644
index 78aaaa8cee..0000000000
--- a/sysdeps/unix/sysv/linux/alpha/pt-vfork.S
+++ /dev/null
@@ -1,43 +0,0 @@ 
-/* vfork ABI-compatibility entry points for libpthread.
-   Copyright (C) 2014-2019 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 Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 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
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
-
-#include <shlib-compat.h>
-
-/* libpthread used to have its own vfork implementation that differed
-   from libc's only in having a pointless micro-optimization.  There
-   is no longer any use to having a separate copy in libpthread, but
-   the historical ABI requires it.  For static linking, there is no
-   need to provide anything here--the libc version will be linked in.
-   For shared library ABI compatibility, there must be __vfork and
-   vfork symbols in libpthread.so.  */
-
-#if (SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_20) \
-     || SHLIB_COMPAT (libpthread, GLIBC_2_1_2, GLIBC_2_20))
-
-#include <vfork.S>
-
-#endif
-
-#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_20)
-compat_symbol (libpthread, __libc_vfork, vfork, GLIBC_2_0);
-#endif
-
-#if SHLIB_COMPAT (libpthread, GLIBC_2_1_2, GLIBC_2_20)
-strong_alias (__libc_vfork, __vfork_compat)
-compat_symbol (libpthread, __vfork_compat, __vfork, GLIBC_2_1_2);
-#endif
diff --git a/sysdeps/unix/sysv/linux/arm/libpthread.abilist b/sysdeps/unix/sysv/linux/arm/libpthread.abilist
index af82a4c632..ee3d0290d0 100644
--- a/sysdeps/unix/sysv/linux/arm/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/arm/libpthread.abilist
@@ -74,7 +74,6 @@  GLIBC_2.4 __read F
 GLIBC_2.4 __res_state F
 GLIBC_2.4 __send F
 GLIBC_2.4 __sigaction F
-GLIBC_2.4 __vfork F
 GLIBC_2.4 __wait F
 GLIBC_2.4 __write F
 GLIBC_2.4 _pthread_cleanup_pop F
@@ -239,7 +238,6 @@  GLIBC_2.4 siglongjmp F
 GLIBC_2.4 sigwait F
 GLIBC_2.4 system F
 GLIBC_2.4 tcdrain F
-GLIBC_2.4 vfork F
 GLIBC_2.4 wait F
 GLIBC_2.4 waitpid F
 GLIBC_2.4 write F
diff --git a/sysdeps/unix/sysv/linux/csky/pt-vfork.S b/sysdeps/unix/sysv/linux/csky/pt-vfork.S
deleted file mode 100644
index 1cc8931700..0000000000
--- a/sysdeps/unix/sysv/linux/csky/pt-vfork.S
+++ /dev/null
@@ -1 +0,0 @@ 
-/* Not needed.  */
diff --git a/sysdeps/unix/sysv/linux/hppa/libpthread.abilist b/sysdeps/unix/sysv/linux/hppa/libpthread.abilist
index bcba07f575..e9b3be6ac8 100644
--- a/sysdeps/unix/sysv/linux/hppa/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/hppa/libpthread.abilist
@@ -46,7 +46,6 @@  GLIBC_2.2 __read F
 GLIBC_2.2 __res_state F
 GLIBC_2.2 __send F
 GLIBC_2.2 __sigaction F
-GLIBC_2.2 __vfork F
 GLIBC_2.2 __wait F
 GLIBC_2.2 __write F
 GLIBC_2.2 _pthread_cleanup_pop F
@@ -192,7 +191,6 @@  GLIBC_2.2 siglongjmp F
 GLIBC_2.2 sigwait F
 GLIBC_2.2 system F
 GLIBC_2.2 tcdrain F
-GLIBC_2.2 vfork F
 GLIBC_2.2 wait F
 GLIBC_2.2 waitpid F
 GLIBC_2.2 write F
diff --git a/sysdeps/unix/sysv/linux/hppa/localplt.data b/sysdeps/unix/sysv/linux/hppa/localplt.data
index 5f3475de19..867413f0c5 100644
--- a/sysdeps/unix/sysv/linux/hppa/localplt.data
+++ b/sysdeps/unix/sysv/linux/hppa/localplt.data
@@ -10,7 +10,6 @@  libc.so: __sigsetjmp
 libc.so: _IO_funlockfile
 libc.so: __errno_location
 libm.so: matherr
-libpthread.so: __errno_location
 # The main malloc is interposed into the dynamic linker, for
 # allocations after the initial link (when dlopen is used).
 ld.so: malloc
diff --git a/sysdeps/unix/sysv/linux/hppa/pt-vfork.S b/sysdeps/unix/sysv/linux/hppa/pt-vfork.S
deleted file mode 100644
index 9d7dda8b63..0000000000
--- a/sysdeps/unix/sysv/linux/hppa/pt-vfork.S
+++ /dev/null
@@ -1,82 +0,0 @@ 
-/* Copyright (C) 2005-2019 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 Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 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
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library.  If not, see
-   <http://www.gnu.org/licenses/>.  */
-
-#include <sysdep.h>
-#define _ERRNO_H        1
-#include <bits/errno.h>
-#include <tcb-offsets.h>
-
-/* Clone the calling process, but without copying the whole address space.
-   The calling process is suspended until the new process exits or is
-   replaced by a call to `execve'.  Return -1 for errors, 0 to the new process,
-   and the process ID of the new process to the old process.  */
-
-.Lthread_start:						ASM_LINE_SEP
-
-	/* r26, r25, r24, r23 are free since vfork has no arguments */
-ENTRY(__vfork)
-	/* We must not create a frame. When the child unwinds to call
-	   exec it will clobber the same frame that the parent
-	   needs to unwind.  */
-
-	/* Save the PIC register. */
-#ifdef PIC
-	copy	%r19, %r25	/* parent */
-#endif
-
-	/* Syscall saves and restores all register states */
-	ble	0x100(%sr2,%r0)
-	ldi	__NR_vfork,%r20
-
-	/* Check for error */
-	ldi	-4096,%r1
-	comclr,>>= %r1,%ret0,%r0        /* Note: unsigned compare. */
-	b,n	.Lerror
-
-	/* Return, and DO NOT restore rp. The child may have called
-	   functions that updated the frame's rp. This works because
-	   the kernel ensures rp is preserved across the vfork
-	   syscall.  */
-	bv,n	%r0(%rp)
-
-.Lerror:
-	/* Now we need a stack to call a function. We are assured
-	   that there is no child now, so it's safe to create
-	   a frame.  */
-	stw	%rp, -20(%sp)
-	.cfi_offset 2, -20
-	stwm	%r3, 64(%sp)
-	.cfi_def_cfa_offset -64
-	.cfi_offset 3, 0
-	stw	%sp, -4(%sp)
-
-	sub	%r0,%ret0,%r3
-	SYSCALL_ERROR_HANDLER
-	/* Restore the PIC register (in delay slot) on error */
-#ifdef PIC
-	copy	%r25, %r19    /* parent */
-#else
-	nop
-#endif
-	/* Write syscall return into errno location */
-	stw	%r3, 0(%ret0)
-	ldw	-84(%sp), %rp
-	bv	%r0(%rp)
-	ldwm	-64(%sp), %r3
-PSEUDO_END (__vfork)
-libc_hidden_def (__vfork)
-weak_alias (__vfork, vfork)
diff --git a/sysdeps/unix/sysv/linux/i386/libpthread.abilist b/sysdeps/unix/sysv/linux/i386/libpthread.abilist
index bece86d246..7199aae573 100644
--- a/sysdeps/unix/sysv/linux/i386/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/i386/libpthread.abilist
@@ -114,7 +114,6 @@  GLIBC_2.0 siglongjmp F
 GLIBC_2.0 sigwait F
 GLIBC_2.0 system F
 GLIBC_2.0 tcdrain F
-GLIBC_2.0 vfork F
 GLIBC_2.0 wait F
 GLIBC_2.0 waitpid F
 GLIBC_2.0 write F
@@ -155,7 +154,7 @@  GLIBC_2.1 sem_wait F
 GLIBC_2.1.1 sem_close F
 GLIBC_2.1.1 sem_open F
 GLIBC_2.1.1 sem_unlink F
-GLIBC_2.1.2 __vfork F
+GLIBC_2.1.2 __libpthread_version_placeholder F
 GLIBC_2.11 pthread_sigqueue F
 GLIBC_2.12 pthread_getname_np F
 GLIBC_2.12 pthread_mutex_consistent F
diff --git a/sysdeps/unix/sysv/linux/ia64/libpthread.abilist b/sysdeps/unix/sysv/linux/ia64/libpthread.abilist
index ccc9449826..e8a65642ca 100644
--- a/sysdeps/unix/sysv/linux/ia64/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/ia64/libpthread.abilist
@@ -46,7 +46,6 @@  GLIBC_2.2 __read F
 GLIBC_2.2 __res_state F
 GLIBC_2.2 __send F
 GLIBC_2.2 __sigaction F
-GLIBC_2.2 __vfork F
 GLIBC_2.2 __wait F
 GLIBC_2.2 __write F
 GLIBC_2.2 _pthread_cleanup_pop F
@@ -192,7 +191,6 @@  GLIBC_2.2 siglongjmp F
 GLIBC_2.2 sigwait F
 GLIBC_2.2 system F
 GLIBC_2.2 tcdrain F
-GLIBC_2.2 vfork F
 GLIBC_2.2 wait F
 GLIBC_2.2 waitpid F
 GLIBC_2.2 write F
diff --git a/sysdeps/unix/sysv/linux/ia64/pt-vfork.S b/sysdeps/unix/sysv/linux/ia64/pt-vfork.S
deleted file mode 100644
index 73bf7b7ef3..0000000000
--- a/sysdeps/unix/sysv/linux/ia64/pt-vfork.S
+++ /dev/null
@@ -1,48 +0,0 @@ 
-/* vfork ABI-compatibility entry points for libpthread.  IA64 version.
-   Copyright (C) 2014-2019 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 Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 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
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
-
-#include <sysdep.h>
-#include <shlib-compat.h>
-
-/* libpthread used to have its own vfork implementation that differed
-   from libc's only in having a pointless micro-optimization.  There
-   is no longer any use to having a separate copy in libpthread, but
-   the historical ABI requires it.  For static linking, there is no
-   need to provide anything here--the libc version will be linked in.
-   For shared library ABI compatibility, there must be __vfork and
-   vfork symbols in libpthread.so.  */
-
-#if (SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_20) \
-     || SHLIB_COMPAT (libpthread, GLIBC_2_1_2, GLIBC_2_20))
-
-LOCAL_LEAF (vfork_compat)
-	br __libc_vfork
-	;;
-END (vfork_compat)
-
-#endif
-
-#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_20)
-weak_alias (vfork_compat, vfork)
-compat_symbol (libpthread, vfork_compat, vfork, GLIBC_2_0);
-#endif
-
-#if SHLIB_COMPAT (libpthread, GLIBC_2_1_2, GLIBC_2_20)
-strong_alias (vfork_compat, __vfork_compat)
-compat_symbol (libpthread, __vfork_compat, __vfork, GLIBC_2_1_2);
-#endif
diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/libpthread.abilist b/sysdeps/unix/sysv/linux/m68k/coldfire/libpthread.abilist
index af82a4c632..ee3d0290d0 100644
--- a/sysdeps/unix/sysv/linux/m68k/coldfire/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/m68k/coldfire/libpthread.abilist
@@ -74,7 +74,6 @@  GLIBC_2.4 __read F
 GLIBC_2.4 __res_state F
 GLIBC_2.4 __send F
 GLIBC_2.4 __sigaction F
-GLIBC_2.4 __vfork F
 GLIBC_2.4 __wait F
 GLIBC_2.4 __write F
 GLIBC_2.4 _pthread_cleanup_pop F
@@ -239,7 +238,6 @@  GLIBC_2.4 siglongjmp F
 GLIBC_2.4 sigwait F
 GLIBC_2.4 system F
 GLIBC_2.4 tcdrain F
-GLIBC_2.4 vfork F
 GLIBC_2.4 wait F
 GLIBC_2.4 waitpid F
 GLIBC_2.4 write F
diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/libpthread.abilist b/sysdeps/unix/sysv/linux/m68k/m680x0/libpthread.abilist
index bece86d246..7199aae573 100644
--- a/sysdeps/unix/sysv/linux/m68k/m680x0/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/m68k/m680x0/libpthread.abilist
@@ -114,7 +114,6 @@  GLIBC_2.0 siglongjmp F
 GLIBC_2.0 sigwait F
 GLIBC_2.0 system F
 GLIBC_2.0 tcdrain F
-GLIBC_2.0 vfork F
 GLIBC_2.0 wait F
 GLIBC_2.0 waitpid F
 GLIBC_2.0 write F
@@ -155,7 +154,7 @@  GLIBC_2.1 sem_wait F
 GLIBC_2.1.1 sem_close F
 GLIBC_2.1.1 sem_open F
 GLIBC_2.1.1 sem_unlink F
-GLIBC_2.1.2 __vfork F
+GLIBC_2.1.2 __libpthread_version_placeholder F
 GLIBC_2.11 pthread_sigqueue F
 GLIBC_2.12 pthread_getname_np F
 GLIBC_2.12 pthread_mutex_consistent F
diff --git a/sysdeps/unix/sysv/linux/m68k/pt-vfork.c b/sysdeps/unix/sysv/linux/m68k/pt-vfork.c
deleted file mode 100644
index 5fbc6526aa..0000000000
--- a/sysdeps/unix/sysv/linux/m68k/pt-vfork.c
+++ /dev/null
@@ -1 +0,0 @@ 
-#include <sysdeps/unix/sysv/linux/aarch64/pt-vfork.c>
diff --git a/sysdeps/unix/sysv/linux/microblaze/libpthread.abilist b/sysdeps/unix/sysv/linux/microblaze/libpthread.abilist
index 5067375d23..e0fbe6848f 100644
--- a/sysdeps/unix/sysv/linux/microblaze/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/microblaze/libpthread.abilist
@@ -45,7 +45,6 @@  GLIBC_2.18 __read F
 GLIBC_2.18 __res_state F
 GLIBC_2.18 __send F
 GLIBC_2.18 __sigaction F
-GLIBC_2.18 __vfork F
 GLIBC_2.18 __wait F
 GLIBC_2.18 __write F
 GLIBC_2.18 _pthread_cleanup_pop F
@@ -218,7 +217,6 @@  GLIBC_2.18 siglongjmp F
 GLIBC_2.18 sigwait F
 GLIBC_2.18 system F
 GLIBC_2.18 tcdrain F
-GLIBC_2.18 vfork F
 GLIBC_2.18 wait F
 GLIBC_2.18 waitpid F
 GLIBC_2.18 write F
diff --git a/sysdeps/unix/sysv/linux/microblaze/pt-vfork.S b/sysdeps/unix/sysv/linux/microblaze/pt-vfork.S
deleted file mode 100644
index 205a28de24..0000000000
--- a/sysdeps/unix/sysv/linux/microblaze/pt-vfork.S
+++ /dev/null
@@ -1,49 +0,0 @@ 
-/* vfork ABI-compatibility entry points for libpthread.
-   Copyright (C) 2014-2019 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 Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 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
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
-
-#include <sysdep.h>
-#include <shlib-compat.h>
-
-/* libpthread used to have its own vfork implementation that differed
-   from libc's only in having a pointless micro-optimization.  There
-   is no longer any use to having a separate copy in libpthread, but
-   the historical ABI requires it.  For static linking, there is no
-   need to provide anything here--the libc version will be linked in.
-   For shared library ABI compatibility, there must be __vfork and
-   vfork symbols in libpthread.so.
-
-   As of GCC 7, microblaze can *not* rely on the compiler to generate
-   a tail call from this vfork to __libc_vfork.  */
-
-#if (SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_20) \
-       || SHLIB_COMPAT (libpthread, GLIBC_2_1_2, GLIBC_2_20))
-
-ENTRY (vfork_compat)
-	bri	__libc_vfork@PLT
-END (vfork_compat)
-
-#endif
-
-#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_20)
-compat_symbol (libpthread, vfork_compat, vfork, GLIBC_2_0)
-#endif
-
-#if SHLIB_COMPAT (libpthread, GLIBC_2_1_2, GLIBC_2_20)
-strong_alias (vfork_compat, vfork_compat2)
-compat_symbol (libpthread, vfork_compat2, __vfork, GLIBC_2_1_2)
-#endif
diff --git a/sysdeps/unix/sysv/linux/mips/mips32/libpthread.abilist b/sysdeps/unix/sysv/linux/mips/mips32/libpthread.abilist
index 02144967c6..f60b22efb5 100644
--- a/sysdeps/unix/sysv/linux/mips/mips32/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips32/libpthread.abilist
@@ -114,7 +114,6 @@  GLIBC_2.0 siglongjmp F
 GLIBC_2.0 sigwait F
 GLIBC_2.0 system F
 GLIBC_2.0 tcdrain F
-GLIBC_2.0 vfork F
 GLIBC_2.0 wait F
 GLIBC_2.0 waitpid F
 GLIBC_2.0 write F
@@ -140,7 +139,6 @@  GLIBC_2.2 __pthread_rwlock_unlock F
 GLIBC_2.2 __pthread_rwlock_wrlock F
 GLIBC_2.2 __pwrite64 F
 GLIBC_2.2 __res_state F
-GLIBC_2.2 __vfork F
 GLIBC_2.2 lseek64 F
 GLIBC_2.2 open64 F
 GLIBC_2.2 pread F
diff --git a/sysdeps/unix/sysv/linux/mips/mips64/libpthread.abilist b/sysdeps/unix/sysv/linux/mips/mips64/libpthread.abilist
index 02144967c6..f60b22efb5 100644
--- a/sysdeps/unix/sysv/linux/mips/mips64/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips64/libpthread.abilist
@@ -114,7 +114,6 @@  GLIBC_2.0 siglongjmp F
 GLIBC_2.0 sigwait F
 GLIBC_2.0 system F
 GLIBC_2.0 tcdrain F
-GLIBC_2.0 vfork F
 GLIBC_2.0 wait F
 GLIBC_2.0 waitpid F
 GLIBC_2.0 write F
@@ -140,7 +139,6 @@  GLIBC_2.2 __pthread_rwlock_unlock F
 GLIBC_2.2 __pthread_rwlock_wrlock F
 GLIBC_2.2 __pwrite64 F
 GLIBC_2.2 __res_state F
-GLIBC_2.2 __vfork F
 GLIBC_2.2 lseek64 F
 GLIBC_2.2 open64 F
 GLIBC_2.2 pread F
diff --git a/sysdeps/unix/sysv/linux/mips/pt-vfork.S b/sysdeps/unix/sysv/linux/mips/pt-vfork.S
deleted file mode 100644
index 65cc3823ac..0000000000
--- a/sysdeps/unix/sysv/linux/mips/pt-vfork.S
+++ /dev/null
@@ -1 +0,0 @@ 
-#include <sysdeps/unix/sysv/linux/alpha/pt-vfork.S>
diff --git a/sysdeps/unix/sysv/linux/nios2/pt-vfork.S b/sysdeps/unix/sysv/linux/nios2/pt-vfork.S
deleted file mode 100644
index 147427a42d..0000000000
--- a/sysdeps/unix/sysv/linux/nios2/pt-vfork.S
+++ /dev/null
@@ -1 +0,0 @@ 
-# Nios2 does not require a stub for vfork in libpthread.
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/libpthread.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/libpthread.abilist
index 09e8447b06..c7d9b78986 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/libpthread.abilist
@@ -114,7 +114,6 @@  GLIBC_2.0 siglongjmp F
 GLIBC_2.0 sigwait F
 GLIBC_2.0 system F
 GLIBC_2.0 tcdrain F
-GLIBC_2.0 vfork F
 GLIBC_2.0 wait F
 GLIBC_2.0 waitpid F
 GLIBC_2.0 write F
@@ -155,7 +154,7 @@  GLIBC_2.1 sem_wait F
 GLIBC_2.1.1 sem_close F
 GLIBC_2.1.1 sem_open F
 GLIBC_2.1.1 sem_unlink F
-GLIBC_2.1.2 __vfork F
+GLIBC_2.1.2 __libpthread_version_placeholder F
 GLIBC_2.11 pthread_sigqueue F
 GLIBC_2.12 pthread_getname_np F
 GLIBC_2.12 pthread_mutex_consistent F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libpthread.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libpthread.abilist
index 8300958d47..3500cce6c1 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libpthread.abilist
@@ -68,7 +68,6 @@  GLIBC_2.3 __read F
 GLIBC_2.3 __res_state F
 GLIBC_2.3 __send F
 GLIBC_2.3 __sigaction F
-GLIBC_2.3 __vfork F
 GLIBC_2.3 __wait F
 GLIBC_2.3 __write F
 GLIBC_2.3 _pthread_cleanup_pop F
@@ -214,7 +213,6 @@  GLIBC_2.3 siglongjmp F
 GLIBC_2.3 sigwait F
 GLIBC_2.3 system F
 GLIBC_2.3 tcdrain F
-GLIBC_2.3 vfork F
 GLIBC_2.3 wait F
 GLIBC_2.3 waitpid F
 GLIBC_2.3 write F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libpthread.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libpthread.abilist
index 9a9e4cee85..6945b7cbe4 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libpthread.abilist
@@ -45,7 +45,6 @@  GLIBC_2.17 __read F
 GLIBC_2.17 __res_state F
 GLIBC_2.17 __send F
 GLIBC_2.17 __sigaction F
-GLIBC_2.17 __vfork F
 GLIBC_2.17 __wait F
 GLIBC_2.17 __write F
 GLIBC_2.17 _pthread_cleanup_pop F
@@ -216,7 +215,6 @@  GLIBC_2.17 siglongjmp F
 GLIBC_2.17 sigwait F
 GLIBC_2.17 system F
 GLIBC_2.17 tcdrain F
-GLIBC_2.17 vfork F
 GLIBC_2.17 wait F
 GLIBC_2.17 waitpid F
 GLIBC_2.17 write F
diff --git a/sysdeps/unix/sysv/linux/riscv/pt-vfork.S b/sysdeps/unix/sysv/linux/riscv/pt-vfork.S
deleted file mode 100644
index 1cc8931700..0000000000
--- a/sysdeps/unix/sysv/linux/riscv/pt-vfork.S
+++ /dev/null
@@ -1 +0,0 @@ 
-/* Not needed.  */
diff --git a/sysdeps/unix/sysv/linux/s390/pt-vfork.S b/sysdeps/unix/sysv/linux/s390/pt-vfork.S
deleted file mode 100644
index 65cc3823ac..0000000000
--- a/sysdeps/unix/sysv/linux/s390/pt-vfork.S
+++ /dev/null
@@ -1 +0,0 @@ 
-#include <sysdeps/unix/sysv/linux/alpha/pt-vfork.S>
diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/libpthread.abilist b/sysdeps/unix/sysv/linux/s390/s390-32/libpthread.abilist
index d05468f3b2..f093634d7e 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-32/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/s390/s390-32/libpthread.abilist
@@ -114,7 +114,6 @@  GLIBC_2.0 siglongjmp F
 GLIBC_2.0 sigwait F
 GLIBC_2.0 system F
 GLIBC_2.0 tcdrain F
-GLIBC_2.0 vfork F
 GLIBC_2.0 wait F
 GLIBC_2.0 waitpid F
 GLIBC_2.0 write F
@@ -155,7 +154,7 @@  GLIBC_2.1 sem_wait F
 GLIBC_2.1.1 sem_close F
 GLIBC_2.1.1 sem_open F
 GLIBC_2.1.1 sem_unlink F
-GLIBC_2.1.2 __vfork F
+GLIBC_2.1.2 __libpthread_version_placeholder F
 GLIBC_2.11 pthread_sigqueue F
 GLIBC_2.12 pthread_getname_np F
 GLIBC_2.12 pthread_mutex_consistent F
diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/libpthread.abilist b/sysdeps/unix/sysv/linux/s390/s390-64/libpthread.abilist
index e8161aa747..47204f166c 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-64/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/s390/s390-64/libpthread.abilist
@@ -48,7 +48,6 @@  GLIBC_2.2 __read F
 GLIBC_2.2 __res_state F
 GLIBC_2.2 __send F
 GLIBC_2.2 __sigaction F
-GLIBC_2.2 __vfork F
 GLIBC_2.2 __wait F
 GLIBC_2.2 __write F
 GLIBC_2.2 _pthread_cleanup_pop F
@@ -194,7 +193,6 @@  GLIBC_2.2 siglongjmp F
 GLIBC_2.2 sigwait F
 GLIBC_2.2 system F
 GLIBC_2.2 tcdrain F
-GLIBC_2.2 vfork F
 GLIBC_2.2 wait F
 GLIBC_2.2 waitpid F
 GLIBC_2.2 write F
diff --git a/sysdeps/unix/sysv/linux/sh/libpthread.abilist b/sysdeps/unix/sysv/linux/sh/libpthread.abilist
index bcba07f575..e9b3be6ac8 100644
--- a/sysdeps/unix/sysv/linux/sh/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/sh/libpthread.abilist
@@ -46,7 +46,6 @@  GLIBC_2.2 __read F
 GLIBC_2.2 __res_state F
 GLIBC_2.2 __send F
 GLIBC_2.2 __sigaction F
-GLIBC_2.2 __vfork F
 GLIBC_2.2 __wait F
 GLIBC_2.2 __write F
 GLIBC_2.2 _pthread_cleanup_pop F
@@ -192,7 +191,6 @@  GLIBC_2.2 siglongjmp F
 GLIBC_2.2 sigwait F
 GLIBC_2.2 system F
 GLIBC_2.2 tcdrain F
-GLIBC_2.2 vfork F
 GLIBC_2.2 wait F
 GLIBC_2.2 waitpid F
 GLIBC_2.2 write F
diff --git a/sysdeps/unix/sysv/linux/sh/pt-vfork.S b/sysdeps/unix/sysv/linux/sh/pt-vfork.S
deleted file mode 100644
index 65cc3823ac..0000000000
--- a/sysdeps/unix/sysv/linux/sh/pt-vfork.S
+++ /dev/null
@@ -1 +0,0 @@ 
-#include <sysdeps/unix/sysv/linux/alpha/pt-vfork.S>
diff --git a/sysdeps/unix/sysv/linux/sparc/pt-vfork.S b/sysdeps/unix/sysv/linux/sparc/pt-vfork.S
deleted file mode 100644
index 65cc3823ac..0000000000
--- a/sysdeps/unix/sysv/linux/sparc/pt-vfork.S
+++ /dev/null
@@ -1 +0,0 @@ 
-#include <sysdeps/unix/sysv/linux/alpha/pt-vfork.S>
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/libpthread.abilist b/sysdeps/unix/sysv/linux/sparc/sparc32/libpthread.abilist
index b413007ccb..2d9b958efa 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc32/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/sparc/sparc32/libpthread.abilist
@@ -114,7 +114,6 @@  GLIBC_2.0 siglongjmp F
 GLIBC_2.0 sigwait F
 GLIBC_2.0 system F
 GLIBC_2.0 tcdrain F
-GLIBC_2.0 vfork F
 GLIBC_2.0 wait F
 GLIBC_2.0 waitpid F
 GLIBC_2.0 write F
@@ -155,7 +154,7 @@  GLIBC_2.1 sem_wait F
 GLIBC_2.1.1 sem_close F
 GLIBC_2.1.1 sem_open F
 GLIBC_2.1.1 sem_unlink F
-GLIBC_2.1.2 __vfork F
+GLIBC_2.1.2 __libpthread_version_placeholder F
 GLIBC_2.11 pthread_sigqueue F
 GLIBC_2.12 pthread_getname_np F
 GLIBC_2.12 pthread_mutex_consistent F
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/libpthread.abilist b/sysdeps/unix/sysv/linux/sparc/sparc64/libpthread.abilist
index ccc9449826..e8a65642ca 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc64/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/sparc/sparc64/libpthread.abilist
@@ -46,7 +46,6 @@  GLIBC_2.2 __read F
 GLIBC_2.2 __res_state F
 GLIBC_2.2 __send F
 GLIBC_2.2 __sigaction F
-GLIBC_2.2 __vfork F
 GLIBC_2.2 __wait F
 GLIBC_2.2 __write F
 GLIBC_2.2 _pthread_cleanup_pop F
@@ -192,7 +191,6 @@  GLIBC_2.2 siglongjmp F
 GLIBC_2.2 sigwait F
 GLIBC_2.2 system F
 GLIBC_2.2 tcdrain F
-GLIBC_2.2 vfork F
 GLIBC_2.2 wait F
 GLIBC_2.2 waitpid F
 GLIBC_2.2 write F
diff --git a/sysdeps/unix/sysv/linux/x86_64/64/libpthread.abilist b/sysdeps/unix/sysv/linux/x86_64/64/libpthread.abilist
index 931c8277a8..4fbb72ffb3 100644
--- a/sysdeps/unix/sysv/linux/x86_64/64/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/x86_64/64/libpthread.abilist
@@ -46,7 +46,6 @@  GLIBC_2.2.5 __read F
 GLIBC_2.2.5 __res_state F
 GLIBC_2.2.5 __send F
 GLIBC_2.2.5 __sigaction F
-GLIBC_2.2.5 __vfork F
 GLIBC_2.2.5 __wait F
 GLIBC_2.2.5 __write F
 GLIBC_2.2.5 _pthread_cleanup_pop F
@@ -193,7 +192,6 @@  GLIBC_2.2.5 siglongjmp F
 GLIBC_2.2.5 sigwait F
 GLIBC_2.2.5 system F
 GLIBC_2.2.5 tcdrain F
-GLIBC_2.2.5 vfork F
 GLIBC_2.2.5 wait F
 GLIBC_2.2.5 waitpid F
 GLIBC_2.2.5 write F
diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/libpthread.abilist b/sysdeps/unix/sysv/linux/x86_64/x32/libpthread.abilist
index c09c9b015a..eec4b99b8b 100644
--- a/sysdeps/unix/sysv/linux/x86_64/x32/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/x86_64/x32/libpthread.abilist
@@ -45,7 +45,6 @@  GLIBC_2.16 __read F
 GLIBC_2.16 __res_state F
 GLIBC_2.16 __send F
 GLIBC_2.16 __sigaction F
-GLIBC_2.16 __vfork F
 GLIBC_2.16 __wait F
 GLIBC_2.16 __write F
 GLIBC_2.16 _pthread_cleanup_pop F
@@ -216,7 +215,6 @@  GLIBC_2.16 siglongjmp F
 GLIBC_2.16 sigwait F
 GLIBC_2.16 system F
 GLIBC_2.16 tcdrain F
-GLIBC_2.16 vfork F
 GLIBC_2.16 wait F
 GLIBC_2.16 waitpid F
 GLIBC_2.16 write F