protobuf: upgrade 3.14.0 -> 3.15.2

0001-fix-m4-pthread-update.patch
Removed since this is included in 3.15.2.

Signed-off-by: Wang Mingyu <wangmy@cn.fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

2 files changed, 1 insertions, 733 deletions

diff --git a/meta-oe/recipes-devtools/protobuf/protobuf/0001-fix-m4-pthread-update.patch b/meta-oe/recipes-devtools/protobuf/protobuf/0001-fix-m4-pthread-update.patch
deleted file mode 100644
index 7e4aa103a..000000000
--- a/meta-oe/recipes-devtools/protobuf/protobuf/0001-fix-m4-pthread-update.patch
+++ /dev/null
@@ -1,731 +0,0 @@
-From 8cfb4284b4e8b2893bd30e9c764d45f288e71efb Mon Sep 17 00:00:00 2001
-From: Adam Cozzette <acozzette@google.com>
-Date: Fri, 20 Nov 2020 16:36:56 -0800
-Subject: [PATCH] Updated ax_pthread.m4 to its most recent upstream version
-
-This should fix #8059.
-
-Upstream-Status: Backport [471317f03adc09a0436670c31d58264b3bef6561]
-Signed-off-by: Adrian Herrera <adrian.herrera@arm.com>
-Expected version: v4.0.0+
----
- m4/ax_pthread.m4 | 614 ++++++++++++++++++++++++-----------------------
- 1 file changed, 318 insertions(+), 296 deletions(-)
-
-diff --git a/m4/ax_pthread.m4 b/m4/ax_pthread.m4
-index d218d1af73..1598d077ff 100644
---- a/m4/ax_pthread.m4
-+++ b/m4/ax_pthread.m4
-@@ -1,5 +1,5 @@
- # ===========================================================================
--#        http://www.gnu.org/software/autoconf-archive/ax_pthread.html
-+#        https://www.gnu.org/software/autoconf-archive/ax_pthread.html
- # ===========================================================================
- #
- # SYNOPSIS
-@@ -55,6 +55,7 @@
- #
- #   Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu>
- #   Copyright (c) 2011 Daniel Richard G. <skunk@iSKUNK.ORG>
-+#   Copyright (c) 2019 Marc Stevens <marc.stevens@cwi.nl>
- #
- #   This program is free software: you can redistribute it and/or modify it
- #   under the terms of the GNU General Public License as published by the
-@@ -67,7 +68,7 @@
- #   Public License for more details.
- #
- #   You should have received a copy of the GNU General Public License along
--#   with this program. If not, see <http://www.gnu.org/licenses/>.
-+#   with this program. If not, see <https://www.gnu.org/licenses/>.
- #
- #   As a special exception, the respective Autoconf Macro's copyright owner
- #   gives unlimited permission to copy, distribute and modify the configure
-@@ -82,7 +83,7 @@
- #   modified version of the Autoconf Macro, you may extend this special
- #   exception to the GPL to apply to your modified version as well.
- 
--#serial 22
-+#serial 27
- 
- AU_ALIAS([ACX_PTHREAD], [AX_PTHREAD])
- AC_DEFUN([AX_PTHREAD], [
-@@ -100,22 +101,22 @@ ax_pthread_ok=no
- # etcetera environment variables, and if threads linking works using
- # them:
- if test "x$PTHREAD_CFLAGS$PTHREAD_LIBS" != "x"; then
--       ax_pthread_save_CC="$CC"
--       ax_pthread_save_CFLAGS="$CFLAGS"
--       ax_pthread_save_LIBS="$LIBS"
--       AS_IF([test "x$PTHREAD_CC" != "x"], [CC="$PTHREAD_CC"])
--       CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
--       LIBS="$PTHREAD_LIBS $LIBS"
--       AC_MSG_CHECKING([for pthread_join using $CC $PTHREAD_CFLAGS $PTHREAD_LIBS])
--       AC_LINK_IFELSE([AC_LANG_CALL([], [pthread_join])], [ax_pthread_ok=yes])
--       AC_MSG_RESULT([$ax_pthread_ok])
--       if test "x$ax_pthread_ok" = "xno"; then
--               PTHREAD_LIBS=""
--               PTHREAD_CFLAGS=""
--       fi
--       CC="$ax_pthread_save_CC"
--       CFLAGS="$ax_pthread_save_CFLAGS"
--       LIBS="$ax_pthread_save_LIBS"
-+        ax_pthread_save_CC="$CC"
-+        ax_pthread_save_CFLAGS="$CFLAGS"
-+        ax_pthread_save_LIBS="$LIBS"
-+        AS_IF([test "x$PTHREAD_CC" != "x"], [CC="$PTHREAD_CC"])
-+        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
-+        LIBS="$PTHREAD_LIBS $LIBS"
-+        AC_MSG_CHECKING([for pthread_join using $CC $PTHREAD_CFLAGS $PTHREAD_LIBS])
-+        AC_LINK_IFELSE([AC_LANG_CALL([], [pthread_join])], [ax_pthread_ok=yes])
-+        AC_MSG_RESULT([$ax_pthread_ok])
-+        if test "x$ax_pthread_ok" = "xno"; then
-+                PTHREAD_LIBS=""
-+                PTHREAD_CFLAGS=""
-+        fi
-+        CC="$ax_pthread_save_CC"
-+        CFLAGS="$ax_pthread_save_CFLAGS"
-+        LIBS="$ax_pthread_save_LIBS"
- fi
- 
- # We must check for the threads library under a number of different
-@@ -123,10 +124,12 @@ fi
- # (e.g. DEC) have both -lpthread and -lpthreads, where one of the
- # libraries is broken (non-POSIX).
- 
--# Create a list of thread flags to try.  Items starting with a "-" are
--# C compiler flags, and other items are library names, except for "none"
--# which indicates that we try without any flags at all, and "pthread-config"
--# which is a program returning the flags for the Pth emulation library.
-+# Create a list of thread flags to try. Items with a "," contain both
-+# C compiler flags (before ",") and linker flags (after ","). Other items
-+# starting with a "-" are C compiler flags, and remaining items are
-+# library names, except for "none" which indicates that we try without
-+# any flags at all, and "pthread-config" which is a program returning
-+# the flags for the Pth emulation library.
- 
- ax_pthread_flags="pthreads none -Kthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
- 
-@@ -152,319 +155,338 @@ ax_pthread_flags="pthreads none -Kthread -pthread -pthreads -mthreads pthread --
- 
- case $host_os in
- 
--       freebsd*)
-+        freebsd*)
- 
--       # -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
--       # lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
-+        # -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
-+        # lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
- 
--       ax_pthread_flags="-kthread lthread $ax_pthread_flags"
--       ;;
-+        ax_pthread_flags="-kthread lthread $ax_pthread_flags"
-+        ;;
- 
--       hpux*)
-+        hpux*)
- 
--       # From the cc(1) man page: "[-mt] Sets various -D flags to enable
--       # multi-threading and also sets -lpthread."
-+        # From the cc(1) man page: "[-mt] Sets various -D flags to enable
-+        # multi-threading and also sets -lpthread."
- 
--       ax_pthread_flags="-mt -pthread pthread $ax_pthread_flags"
--       ;;
-+        ax_pthread_flags="-mt -pthread pthread $ax_pthread_flags"
-+        ;;
- 
--       openedition*)
-+        openedition*)
- 
--       # IBM z/OS requires a feature-test macro to be defined in order to
--       # enable POSIX threads at all, so give the user a hint if this is
--       # not set. (We don't define these ourselves, as they can affect
--       # other portions of the system API in unpredictable ways.)
-+        # IBM z/OS requires a feature-test macro to be defined in order to
-+        # enable POSIX threads at all, so give the user a hint if this is
-+        # not set. (We don't define these ourselves, as they can affect
-+        # other portions of the system API in unpredictable ways.)
- 
--       AC_EGREP_CPP([AX_PTHREAD_ZOS_MISSING],
--           [
--#           if !defined(_OPEN_THREADS) && !defined(_UNIX03_THREADS)
--            AX_PTHREAD_ZOS_MISSING
--#           endif
--           ],
--           [AC_MSG_WARN([IBM z/OS requires -D_OPEN_THREADS or -D_UNIX03_THREADS to enable pthreads support.])])
--       ;;
-+        AC_EGREP_CPP([AX_PTHREAD_ZOS_MISSING],
-+            [
-+#            if !defined(_OPEN_THREADS) && !defined(_UNIX03_THREADS)
-+             AX_PTHREAD_ZOS_MISSING
-+#            endif
-+            ],
-+            [AC_MSG_WARN([IBM z/OS requires -D_OPEN_THREADS or -D_UNIX03_THREADS to enable pthreads support.])])
-+        ;;
- 
--       solaris*)
-+        solaris*)
- 
--       # On Solaris (at least, for some versions), libc contains stubbed
--       # (non-functional) versions of the pthreads routines, so link-based
--       # tests will erroneously succeed. (N.B.: The stubs are missing
--       # pthread_cleanup_push, or rather a function called by this macro,
--       # so we could check for that, but who knows whether they'll stub
--       # that too in a future libc.)  So we'll check first for the
--       # standard Solaris way of linking pthreads (-mt -lpthread).
-+        # On Solaris (at least, for some versions), libc contains stubbed
-+        # (non-functional) versions of the pthreads routines, so link-based
-+        # tests will erroneously succeed. (N.B.: The stubs are missing
-+        # pthread_cleanup_push, or rather a function called by this macro,
-+        # so we could check for that, but who knows whether they'll stub
-+        # that too in a future libc.)  So we'll check first for the
-+        # standard Solaris way of linking pthreads (-mt -lpthread).
- 
--       ax_pthread_flags="-mt,pthread pthread $ax_pthread_flags"
--       ;;
-+        ax_pthread_flags="-mt,-lpthread pthread $ax_pthread_flags"
-+        ;;
- esac
- 
-+# Are we compiling with Clang?
-+
-+AC_CACHE_CHECK([whether $CC is Clang],
-+    [ax_cv_PTHREAD_CLANG],
-+    [ax_cv_PTHREAD_CLANG=no
-+     # Note that Autoconf sets GCC=yes for Clang as well as GCC
-+     if test "x$GCC" = "xyes"; then
-+        AC_EGREP_CPP([AX_PTHREAD_CC_IS_CLANG],
-+            [/* Note: Clang 2.7 lacks __clang_[a-z]+__ */
-+#            if defined(__clang__) && defined(__llvm__)
-+             AX_PTHREAD_CC_IS_CLANG
-+#            endif
-+            ],
-+            [ax_cv_PTHREAD_CLANG=yes])
-+     fi
-+    ])
-+ax_pthread_clang="$ax_cv_PTHREAD_CLANG"
-+
-+
- # GCC generally uses -pthread, or -pthreads on some platforms (e.g. SPARC)
- 
-+# Note that for GCC and Clang -pthread generally implies -lpthread,
-+# except when -nostdlib is passed.
-+# This is problematic using libtool to build C++ shared libraries with pthread:
-+# [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=25460
-+# [2] https://bugzilla.redhat.com/show_bug.cgi?id=661333
-+# [3] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=468555
-+# To solve this, first try -pthread together with -lpthread for GCC
-+
- AS_IF([test "x$GCC" = "xyes"],
--      [ax_pthread_flags="-pthread -pthreads $ax_pthread_flags"])
-+      [ax_pthread_flags="-pthread,-lpthread -pthread -pthreads $ax_pthread_flags"])
-+
-+# Clang takes -pthread (never supported any other flag), but we'll try with -lpthread first
-+
-+AS_IF([test "x$ax_pthread_clang" = "xyes"],
-+      [ax_pthread_flags="-pthread,-lpthread -pthread"])
-+
- 
- # The presence of a feature test macro requesting re-entrant function
- # definitions is, on some systems, a strong hint that pthreads support is
- # correctly enabled
- 
- case $host_os in
--       darwin* | hpux* | linux* | osf* | solaris*)
--       ax_pthread_check_macro="_REENTRANT"
--       ;;
-+        darwin* | hpux* | linux* | osf* | solaris*)
-+        ax_pthread_check_macro="_REENTRANT"
-+        ;;
- 
--       aix* | freebsd*)
--       ax_pthread_check_macro="_THREAD_SAFE"
--       ;;
-+        aix*)
-+        ax_pthread_check_macro="_THREAD_SAFE"
-+        ;;
- 
--       *)
--       ax_pthread_check_macro="--"
--       ;;
-+        *)
-+        ax_pthread_check_macro="--"
-+        ;;
- esac
- AS_IF([test "x$ax_pthread_check_macro" = "x--"],
-       [ax_pthread_check_cond=0],
-       [ax_pthread_check_cond="!defined($ax_pthread_check_macro)"])
- 
--# Are we compiling with Clang?
- 
--AC_CACHE_CHECK([whether $CC is Clang],
--    [ax_cv_PTHREAD_CLANG],
--    [ax_cv_PTHREAD_CLANG=no
--     # Note that Autoconf sets GCC=yes for Clang as well as GCC
--     if test "x$GCC" = "xyes"; then
--       AC_EGREP_CPP([AX_PTHREAD_CC_IS_CLANG],
--           [/* Note: Clang 2.7 lacks __clang_[a-z]+__ */
--#           if defined(__clang__) && defined(__llvm__)
--            AX_PTHREAD_CC_IS_CLANG
--#           endif
--           ],
--           [ax_cv_PTHREAD_CLANG=yes])
--     fi
--    ])
--ax_pthread_clang="$ax_cv_PTHREAD_CLANG"
-+if test "x$ax_pthread_ok" = "xno"; then
-+for ax_pthread_try_flag in $ax_pthread_flags; do
-+
-+        case $ax_pthread_try_flag in
-+                none)
-+                AC_MSG_CHECKING([whether pthreads work without any flags])
-+                ;;
-+
-+                *,*)
-+                PTHREAD_CFLAGS=`echo $ax_pthread_try_flag | sed "s/^\(.*\),\(.*\)$/\1/"`
-+                PTHREAD_LIBS=`echo $ax_pthread_try_flag | sed "s/^\(.*\),\(.*\)$/\2/"`
-+                AC_MSG_CHECKING([whether pthreads work with "$PTHREAD_CFLAGS" and "$PTHREAD_LIBS"])
-+                ;;
-+
-+                -*)
-+                AC_MSG_CHECKING([whether pthreads work with $ax_pthread_try_flag])
-+                PTHREAD_CFLAGS="$ax_pthread_try_flag"
-+                ;;
-+
-+                pthread-config)
-+                AC_CHECK_PROG([ax_pthread_config], [pthread-config], [yes], [no])
-+                AS_IF([test "x$ax_pthread_config" = "xno"], [continue])
-+                PTHREAD_CFLAGS="`pthread-config --cflags`"
-+                PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`"
-+                ;;
-+
-+                *)
-+                AC_MSG_CHECKING([for the pthreads library -l$ax_pthread_try_flag])
-+                PTHREAD_LIBS="-l$ax_pthread_try_flag"
-+                ;;
-+        esac
-+
-+        ax_pthread_save_CFLAGS="$CFLAGS"
-+        ax_pthread_save_LIBS="$LIBS"
-+        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
-+        LIBS="$PTHREAD_LIBS $LIBS"
-+
-+        # Check for various functions.  We must include pthread.h,
-+        # since some functions may be macros.  (On the Sequent, we
-+        # need a special flag -Kthread to make this header compile.)
-+        # We check for pthread_join because it is in -lpthread on IRIX
-+        # while pthread_create is in libc.  We check for pthread_attr_init
-+        # due to DEC craziness with -lpthreads.  We check for
-+        # pthread_cleanup_push because it is one of the few pthread
-+        # functions on Solaris that doesn't have a non-functional libc stub.
-+        # We try pthread_create on general principles.
-+
-+        AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>
-+#                       if $ax_pthread_check_cond
-+#                        error "$ax_pthread_check_macro must be defined"
-+#                       endif
-+                        static void *some_global = NULL;
-+                        static void routine(void *a)
-+                          {
-+                             /* To avoid any unused-parameter or
-+                                unused-but-set-parameter warning.  */
-+                             some_global = a;
-+                          }
-+                        static void *start_routine(void *a) { return a; }],
-+                       [pthread_t th; pthread_attr_t attr;
-+                        pthread_create(&th, 0, start_routine, 0);
-+                        pthread_join(th, 0);
-+                        pthread_attr_init(&attr);
-+                        pthread_cleanup_push(routine, 0);
-+                        pthread_cleanup_pop(0) /* ; */])],
-+            [ax_pthread_ok=yes],
-+            [])
-+
-+        CFLAGS="$ax_pthread_save_CFLAGS"
-+        LIBS="$ax_pthread_save_LIBS"
-+
-+        AC_MSG_RESULT([$ax_pthread_ok])
-+        AS_IF([test "x$ax_pthread_ok" = "xyes"], [break])
-+
-+        PTHREAD_LIBS=""
-+        PTHREAD_CFLAGS=""
-+done
-+fi
- 
--ax_pthread_clang_warning=no
- 
- # Clang needs special handling, because older versions handle the -pthread
- # option in a rather... idiosyncratic way
- 
- if test "x$ax_pthread_clang" = "xyes"; then
- 
--       # Clang takes -pthread; it has never supported any other flag
--
--       # (Note 1: This will need to be revisited if a system that Clang
--       # supports has POSIX threads in a separate library.  This tends not
--       # to be the way of modern systems, but it's conceivable.)
--
--       # (Note 2: On some systems, notably Darwin, -pthread is not needed
--       # to get POSIX threads support; the API is always present and
--       # active.  We could reasonably leave PTHREAD_CFLAGS empty.  But
--       # -pthread does define _REENTRANT, and while the Darwin headers
--       # ignore this macro, third-party headers might not.)
--
--       PTHREAD_CFLAGS="-pthread"
--       PTHREAD_LIBS=
--
--       ax_pthread_ok=yes
--
--       # However, older versions of Clang make a point of warning the user
--       # that, in an invocation where only linking and no compilation is
--       # taking place, the -pthread option has no effect ("argument unused
--       # during compilation").  They expect -pthread to be passed in only
--       # when source code is being compiled.
--       #
--       # Problem is, this is at odds with the way Automake and most other
--       # C build frameworks function, which is that the same flags used in
--       # compilation (CFLAGS) are also used in linking.  Many systems
--       # supported by AX_PTHREAD require exactly this for POSIX threads
--       # support, and in fact it is often not straightforward to specify a
--       # flag that is used only in the compilation phase and not in
--       # linking.  Such a scenario is extremely rare in practice.
--       #
--       # Even though use of the -pthread flag in linking would only print
--       # a warning, this can be a nuisance for well-run software projects
--       # that build with -Werror.  So if the active version of Clang has
--       # this misfeature, we search for an option to squash it.
--
--       AC_CACHE_CHECK([whether Clang needs flag to prevent "argument unused" warning when linking with -pthread],
--           [ax_cv_PTHREAD_CLANG_NO_WARN_FLAG],
--           [ax_cv_PTHREAD_CLANG_NO_WARN_FLAG=unknown
--            # Create an alternate version of $ac_link that compiles and
--            # links in two steps (.c -> .o, .o -> exe) instead of one
--            # (.c -> exe), because the warning occurs only in the second
--            # step
--            ax_pthread_save_ac_link="$ac_link"
--            ax_pthread_sed='s/conftest\.\$ac_ext/conftest.$ac_objext/g'
--            ax_pthread_link_step=`$as_echo "$ac_link" | sed "$ax_pthread_sed"`
--            ax_pthread_2step_ac_link="($ac_compile) && (echo ==== >&5) && ($ax_pthread_link_step)"
--            ax_pthread_save_CFLAGS="$CFLAGS"
--            for ax_pthread_try in '' -Qunused-arguments -Wno-unused-command-line-argument unknown; do
--               AS_IF([test "x$ax_pthread_try" = "xunknown"], [break])
--               CFLAGS="-Werror -Wunknown-warning-option $ax_pthread_try -pthread $ax_pthread_save_CFLAGS"
--               ac_link="$ax_pthread_save_ac_link"
--               AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])],
--                   [ac_link="$ax_pthread_2step_ac_link"
--                    AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])],
--                        [break])
--                   ])
--            done
--            ac_link="$ax_pthread_save_ac_link"
--            CFLAGS="$ax_pthread_save_CFLAGS"
--            AS_IF([test "x$ax_pthread_try" = "x"], [ax_pthread_try=no])
--            ax_cv_PTHREAD_CLANG_NO_WARN_FLAG="$ax_pthread_try"
--           ])
--
--       case "$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG" in
--               no | unknown) ;;
--               *) PTHREAD_CFLAGS="$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG $PTHREAD_CFLAGS" ;;
--       esac
-+        # Clang takes -pthread; it has never supported any other flag
-+
-+        # (Note 1: This will need to be revisited if a system that Clang
-+        # supports has POSIX threads in a separate library.  This tends not
-+        # to be the way of modern systems, but it's conceivable.)
-+
-+        # (Note 2: On some systems, notably Darwin, -pthread is not needed
-+        # to get POSIX threads support; the API is always present and
-+        # active.  We could reasonably leave PTHREAD_CFLAGS empty.  But
-+        # -pthread does define _REENTRANT, and while the Darwin headers
-+        # ignore this macro, third-party headers might not.)
-+
-+        # However, older versions of Clang make a point of warning the user
-+        # that, in an invocation where only linking and no compilation is
-+        # taking place, the -pthread option has no effect ("argument unused
-+        # during compilation").  They expect -pthread to be passed in only
-+        # when source code is being compiled.
-+        #
-+        # Problem is, this is at odds with the way Automake and most other
-+        # C build frameworks function, which is that the same flags used in
-+        # compilation (CFLAGS) are also used in linking.  Many systems
-+        # supported by AX_PTHREAD require exactly this for POSIX threads
-+        # support, and in fact it is often not straightforward to specify a
-+        # flag that is used only in the compilation phase and not in
-+        # linking.  Such a scenario is extremely rare in practice.
-+        #
-+        # Even though use of the -pthread flag in linking would only print
-+        # a warning, this can be a nuisance for well-run software projects
-+        # that build with -Werror.  So if the active version of Clang has
-+        # this misfeature, we search for an option to squash it.
-+
-+        AC_CACHE_CHECK([whether Clang needs flag to prevent "argument unused" warning when linking with -pthread],
-+            [ax_cv_PTHREAD_CLANG_NO_WARN_FLAG],
-+            [ax_cv_PTHREAD_CLANG_NO_WARN_FLAG=unknown
-+             # Create an alternate version of $ac_link that compiles and
-+             # links in two steps (.c -> .o, .o -> exe) instead of one
-+             # (.c -> exe), because the warning occurs only in the second
-+             # step
-+             ax_pthread_save_ac_link="$ac_link"
-+             ax_pthread_sed='s/conftest\.\$ac_ext/conftest.$ac_objext/g'
-+             ax_pthread_link_step=`$as_echo "$ac_link" | sed "$ax_pthread_sed"`
-+             ax_pthread_2step_ac_link="($ac_compile) && (echo ==== >&5) && ($ax_pthread_link_step)"
-+             ax_pthread_save_CFLAGS="$CFLAGS"
-+             for ax_pthread_try in '' -Qunused-arguments -Wno-unused-command-line-argument unknown; do
-+                AS_IF([test "x$ax_pthread_try" = "xunknown"], [break])
-+                CFLAGS="-Werror -Wunknown-warning-option $ax_pthread_try -pthread $ax_pthread_save_CFLAGS"
-+                ac_link="$ax_pthread_save_ac_link"
-+                AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])],
-+                    [ac_link="$ax_pthread_2step_ac_link"
-+                     AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])],
-+                         [break])
-+                    ])
-+             done
-+             ac_link="$ax_pthread_save_ac_link"
-+             CFLAGS="$ax_pthread_save_CFLAGS"
-+             AS_IF([test "x$ax_pthread_try" = "x"], [ax_pthread_try=no])
-+             ax_cv_PTHREAD_CLANG_NO_WARN_FLAG="$ax_pthread_try"
-+            ])
-+
-+        case "$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG" in
-+                no | unknown) ;;
-+                *) PTHREAD_CFLAGS="$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG $PTHREAD_CFLAGS" ;;
-+        esac
- 
- fi # $ax_pthread_clang = yes
- 
--if test "x$ax_pthread_ok" = "xno"; then
--for ax_pthread_try_flag in $ax_pthread_flags; do
- 
--       case $ax_pthread_try_flag in
--               none)
--               AC_MSG_CHECKING([whether pthreads work without any flags])
--               ;;
--
--               -mt,pthread)
--               AC_MSG_CHECKING([whether pthreads work with -mt -lpthread])
--               PTHREAD_CFLAGS="-mt"
--               PTHREAD_LIBS="-lpthread"
--               ;;
--
--               -*)
--               AC_MSG_CHECKING([whether pthreads work with $ax_pthread_try_flag])
--               PTHREAD_CFLAGS="$ax_pthread_try_flag"
--               ;;
--
--               pthread-config)
--               AC_CHECK_PROG([ax_pthread_config], [pthread-config], [yes], [no])
--               AS_IF([test "x$ax_pthread_config" = "xno"], [continue])
--               PTHREAD_CFLAGS="`pthread-config --cflags`"
--               PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`"
--               ;;
--
--               *)
--               AC_MSG_CHECKING([for the pthreads library -l$ax_pthread_try_flag])
--               PTHREAD_LIBS="-l$ax_pthread_try_flag"
--               ;;
--       esac
--
--       ax_pthread_save_CFLAGS="$CFLAGS"
--       ax_pthread_save_LIBS="$LIBS"
--       CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
--       LIBS="$PTHREAD_LIBS $LIBS"
--
--       # Check for various functions.  We must include pthread.h,
--       # since some functions may be macros.  (On the Sequent, we
--       # need a special flag -Kthread to make this header compile.)
--       # We check for pthread_join because it is in -lpthread on IRIX
--       # while pthread_create is in libc.  We check for pthread_attr_init
--       # due to DEC craziness with -lpthreads.  We check for
--       # pthread_cleanup_push because it is one of the few pthread
--       # functions on Solaris that doesn't have a non-functional libc stub.
--       # We try pthread_create on general principles.
--
--       AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>
--#                      if $ax_pthread_check_cond
--#                       error "$ax_pthread_check_macro must be defined"
--#                      endif
--                       static void routine(void *a) { a = 0; }
--                       static void *start_routine(void *a) { return a; }],
--                      [pthread_t th; pthread_attr_t attr;
--                       pthread_create(&th, 0, start_routine, 0);
--                       pthread_join(th, 0);
--                       pthread_attr_init(&attr);
--                       pthread_cleanup_push(routine, 0);
--                       pthread_cleanup_pop(0) /* ; */])],
--           [ax_pthread_ok=yes],
--           [])
--
--       CFLAGS="$ax_pthread_save_CFLAGS"
--       LIBS="$ax_pthread_save_LIBS"
--
--       AC_MSG_RESULT([$ax_pthread_ok])
--       AS_IF([test "x$ax_pthread_ok" = "xyes"], [break])
--
--       PTHREAD_LIBS=""
--       PTHREAD_CFLAGS=""
--done
--fi
- 
- # Various other checks:
- if test "x$ax_pthread_ok" = "xyes"; then
--       ax_pthread_save_CFLAGS="$CFLAGS"
--       ax_pthread_save_LIBS="$LIBS"
--       CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
--       LIBS="$PTHREAD_LIBS $LIBS"
--
--       # Detect AIX lossage: JOINABLE attribute is called UNDETACHED.
--       AC_CACHE_CHECK([for joinable pthread attribute],
--           [ax_cv_PTHREAD_JOINABLE_ATTR],
--           [ax_cv_PTHREAD_JOINABLE_ATTR=unknown
--            for ax_pthread_attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
--                AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>],
--                                                [int attr = $ax_pthread_attr; return attr /* ; */])],
--                               [ax_cv_PTHREAD_JOINABLE_ATTR=$ax_pthread_attr; break],
--                               [])
--            done
--           ])
--       AS_IF([test "x$ax_cv_PTHREAD_JOINABLE_ATTR" != "xunknown" && \
--              test "x$ax_cv_PTHREAD_JOINABLE_ATTR" != "xPTHREAD_CREATE_JOINABLE" && \
--              test "x$ax_pthread_joinable_attr_defined" != "xyes"],
--             [AC_DEFINE_UNQUOTED([PTHREAD_CREATE_JOINABLE],
--                                 [$ax_cv_PTHREAD_JOINABLE_ATTR],
--                                 [Define to necessary symbol if this constant
--                                  uses a non-standard name on your system.])
--              ax_pthread_joinable_attr_defined=yes
--             ])
--
--       AC_CACHE_CHECK([whether more special flags are required for pthreads],
--           [ax_cv_PTHREAD_SPECIAL_FLAGS],
--           [ax_cv_PTHREAD_SPECIAL_FLAGS=no
--            case $host_os in
--            solaris*)
--            ax_cv_PTHREAD_SPECIAL_FLAGS="-D_POSIX_PTHREAD_SEMANTICS"
--            ;;
--            esac
--           ])
--       AS_IF([test "x$ax_cv_PTHREAD_SPECIAL_FLAGS" != "xno" && \
--              test "x$ax_pthread_special_flags_added" != "xyes"],
--             [PTHREAD_CFLAGS="$ax_cv_PTHREAD_SPECIAL_FLAGS $PTHREAD_CFLAGS"
--              ax_pthread_special_flags_added=yes])
--
--       AC_CACHE_CHECK([for PTHREAD_PRIO_INHERIT],
--           [ax_cv_PTHREAD_PRIO_INHERIT],
--           [AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <pthread.h>]],
--                                            [[int i = PTHREAD_PRIO_INHERIT;]])],
--                           [ax_cv_PTHREAD_PRIO_INHERIT=yes],
--                           [ax_cv_PTHREAD_PRIO_INHERIT=no])
--           ])
--       AS_IF([test "x$ax_cv_PTHREAD_PRIO_INHERIT" = "xyes" && \
--              test "x$ax_pthread_prio_inherit_defined" != "xyes"],
--             [AC_DEFINE([HAVE_PTHREAD_PRIO_INHERIT], [1], [Have PTHREAD_PRIO_INHERIT.])
--              ax_pthread_prio_inherit_defined=yes
--             ])
--
--       CFLAGS="$ax_pthread_save_CFLAGS"
--       LIBS="$ax_pthread_save_LIBS"
--
--       # More AIX lossage: compile with *_r variant
--       if test "x$GCC" != "xyes"; then
--           case $host_os in
--               aix*)
--               AS_CASE(["x/$CC"],
--                   [x*/c89|x*/c89_128|x*/c99|x*/c99_128|x*/cc|x*/cc128|x*/xlc|x*/xlc_v6|x*/xlc128|x*/xlc128_v6],
--                   [#handle absolute path differently from PATH based program lookup
--                    AS_CASE(["x$CC"],
--                        [x/*],
--                        [AS_IF([AS_EXECUTABLE_P([${CC}_r])],[PTHREAD_CC="${CC}_r"])],
--                        [AC_CHECK_PROGS([PTHREAD_CC],[${CC}_r],[$CC])])])
--               ;;
--           esac
--       fi
-+        ax_pthread_save_CFLAGS="$CFLAGS"
-+        ax_pthread_save_LIBS="$LIBS"
-+        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
-+        LIBS="$PTHREAD_LIBS $LIBS"
-+
-+        # Detect AIX lossage: JOINABLE attribute is called UNDETACHED.
-+        AC_CACHE_CHECK([for joinable pthread attribute],
-+            [ax_cv_PTHREAD_JOINABLE_ATTR],
-+            [ax_cv_PTHREAD_JOINABLE_ATTR=unknown
-+             for ax_pthread_attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
-+                 AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>],
-+                                                 [int attr = $ax_pthread_attr; return attr /* ; */])],
-+                                [ax_cv_PTHREAD_JOINABLE_ATTR=$ax_pthread_attr; break],
-+                                [])
-+             done
-+            ])
-+        AS_IF([test "x$ax_cv_PTHREAD_JOINABLE_ATTR" != "xunknown" && \
-+               test "x$ax_cv_PTHREAD_JOINABLE_ATTR" != "xPTHREAD_CREATE_JOINABLE" && \
-+               test "x$ax_pthread_joinable_attr_defined" != "xyes"],
-+              [AC_DEFINE_UNQUOTED([PTHREAD_CREATE_JOINABLE],
-+                                  [$ax_cv_PTHREAD_JOINABLE_ATTR],
-+                                  [Define to necessary symbol if this constant
-+                                   uses a non-standard name on your system.])
-+               ax_pthread_joinable_attr_defined=yes
-+              ])
-+
-+        AC_CACHE_CHECK([whether more special flags are required for pthreads],
-+            [ax_cv_PTHREAD_SPECIAL_FLAGS],
-+            [ax_cv_PTHREAD_SPECIAL_FLAGS=no
-+             case $host_os in
-+             solaris*)
-+             ax_cv_PTHREAD_SPECIAL_FLAGS="-D_POSIX_PTHREAD_SEMANTICS"
-+             ;;
-+             esac
-+            ])
-+        AS_IF([test "x$ax_cv_PTHREAD_SPECIAL_FLAGS" != "xno" && \
-+               test "x$ax_pthread_special_flags_added" != "xyes"],
-+              [PTHREAD_CFLAGS="$ax_cv_PTHREAD_SPECIAL_FLAGS $PTHREAD_CFLAGS"
-+               ax_pthread_special_flags_added=yes])
-+
-+        AC_CACHE_CHECK([for PTHREAD_PRIO_INHERIT],
-+            [ax_cv_PTHREAD_PRIO_INHERIT],
-+            [AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <pthread.h>]],
-+                                             [[int i = PTHREAD_PRIO_INHERIT;
-+                                               return i;]])],
-+                            [ax_cv_PTHREAD_PRIO_INHERIT=yes],
-+                            [ax_cv_PTHREAD_PRIO_INHERIT=no])
-+            ])
-+        AS_IF([test "x$ax_cv_PTHREAD_PRIO_INHERIT" = "xyes" && \
-+               test "x$ax_pthread_prio_inherit_defined" != "xyes"],
-+              [AC_DEFINE([HAVE_PTHREAD_PRIO_INHERIT], [1], [Have PTHREAD_PRIO_INHERIT.])
-+               ax_pthread_prio_inherit_defined=yes
-+              ])
-+
-+        CFLAGS="$ax_pthread_save_CFLAGS"
-+        LIBS="$ax_pthread_save_LIBS"
-+
-+        # More AIX lossage: compile with *_r variant
-+        if test "x$GCC" != "xyes"; then
-+            case $host_os in
-+                aix*)
-+                AS_CASE(["x/$CC"],
-+                    [x*/c89|x*/c89_128|x*/c99|x*/c99_128|x*/cc|x*/cc128|x*/xlc|x*/xlc_v6|x*/xlc128|x*/xlc128_v6],
-+                    [#handle absolute path differently from PATH based program lookup
-+                     AS_CASE(["x$CC"],
-+                         [x/*],
-+                         [AS_IF([AS_EXECUTABLE_P([${CC}_r])],[PTHREAD_CC="${CC}_r"])],
-+                         [AC_CHECK_PROGS([PTHREAD_CC],[${CC}_r],[$CC])])])
-+                ;;
-+            esac
-+        fi
- fi
- 
- test -n "$PTHREAD_CC" || PTHREAD_CC="$CC"
-@@ -475,11 +497,11 @@ AC_SUBST([PTHREAD_CC])
- 
- # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
- if test "x$ax_pthread_ok" = "xyes"; then
--       ifelse([$1],,[AC_DEFINE([HAVE_PTHREAD],[1],[Define if you have POSIX threads libraries and header files.])],[$1])
--       :
-+        ifelse([$1],,[AC_DEFINE([HAVE_PTHREAD],[1],[Define if you have POSIX threads libraries and header files.])],[$1])
-+        :
- else
--       ax_pthread_ok=no
--       $2
-+        ax_pthread_ok=no
-+        $2
- fi
- AC_LANG_POP
- ])dnl AX_PTHREAD
diff --git a/meta-oe/recipes-devtools/protobuf/protobuf_3.14.0.bb b/meta-oe/recipes-devtools/protobuf/protobuf_3.15.2.bb
index 00f1e99d3..0392f9339 100644
--- a/meta-oe/recipes-devtools/protobuf/protobuf_3.14.0.bb
+++ b/meta-oe/recipes-devtools/protobuf/protobuf_3.15.2.bb
@@ -10,14 +10,13 @@ LIC_FILES_CHKSUM = "file://LICENSE;md5=37b5762e07f0af8c74ce80a8bda4266b"
 DEPENDS = "zlib"
 DEPENDS_append_class-target = " protobuf-native"
 
-SRCREV = "2514f0bd7da7e2af1bed4c5d1b84f031c4d12c10"
+SRCREV = "d7e943b8d2bc444a8c770644e73d090b486f8b37"
 
 SRC_URI = "git://github.com/protocolbuffers/protobuf.git \
            file://run-ptest \
            file://0001-protobuf-fix-configure-error.patch \
            file://0001-Makefile.am-include-descriptor.cc-when-building-libp.patch \
            file://0001-examples-Makefile-respect-CXX-LDFLAGS-variables-fix-.patch \
-           file://0001-fix-m4-pthread-update.patch \
 "
 S = "${WORKDIR}/git"