pseudo: Fix to work with glibc 2.34 systems

The merge of libdl into libc in glibc 2.34 causes problems for pseudo. Add a fix
that works around this issue.

(From OE-Core rev: dd3e46a043c81cd4d81731a0f691868d3c059742)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/pseudo/files/build-oldlibc

@@ -0,0 +1,20 @@
+#!/bin/sh
+#
+# Script to re-generate pseudo-prebuilt-2.33.tar.xz
+#
+# Copyright (C) 2021 Richard Purdie
+#
+# SPDX-License-Identifier: GPL-2.0-only
+#
+
+for i in x86_64 aarch64 i686; do
+    if [ ! -e $i-nativesdk-libc.tar.xz ]; then
+        wget http://downloads.yoctoproject.org/releases/uninative/3.2/$i-nativesdk-libc.tar.xz
+    fi
+    tar -xf $i-nativesdk-libc.tar.xz --wildcards \*/lib/libpthread\* \*/lib/libdl\*
+    cd $i-linux/lib
+    ln -s libdl.so.2 libdl.so
+    ln -s libpthread.so.0 libpthread.so
+    cd ../..
+done
+tar -cJf pseudo-prebuilt-2.33.tar.xz *-linux

meta/recipes-devtools/pseudo/files/older-glibc-symbols.patch

@@ -0,0 +1,49 @@
+If we link against a newer glibc 2.34 and then try and our LD_PRELOAD is run against a
+binary on a host with an older libc, we see symbol errors since in glibc 2.34, pthread 
+and dl are merged into libc itself.
+
+We need to use the older form of linking so use glibc binaries from an older release
+to force this. We only use minimal symbols from these anyway.
+
+pthread_atfork is problematic, particularly on arm so use the internal glibc routine
+it maps too. This was always present in the main libc from 2.3.2 onwards.
+
+Yes this is horrible. Better solutions welcome.
+
+There is more info in the bug: [YOCTO #14521]
+
+Upstream-Status: Inappropriate [this patch is native only]
+Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
+
+Index: git/Makefile.in
+===================================================================
+--- git.orig/Makefile.in
++++ git/Makefile.in
+@@ -122,7 +122,7 @@ libpseudo: $(LIBPSEUDO)
+ $(LIBPSEUDO): $(WRAPOBJS) pseudo_client.o pseudo_ipc.o $(SHOBJS) | $(LIB)
+ 	$(CC) $(CFLAGS) $(CFLAGS_PSEUDO) -shared -o $(LIBPSEUDO) \
+ 		pseudo_client.o pseudo_ipc.o \
+-		$(WRAPOBJS) $(SHOBJS) $(LDFLAGS) $(CLIENT_LDFLAGS)
++		$(WRAPOBJS) $(SHOBJS) $(LDFLAGS) -Lprebuilt/$(shell uname -m)-linux/lib/ $(CLIENT_LDFLAGS)
+ 
+ # *everything* now relies on stuff that's generated in the
+ # wrapper process.
+Index: git/pseudo_wrappers.c
+===================================================================
+--- git.orig/pseudo_wrappers.c
++++ git/pseudo_wrappers.c
+@@ -100,10 +100,13 @@ static void libpseudo_atfork_child(void)
+ 	pseudo_mutex_holder = 0;
+ }
+ 
++extern void *__dso_handle;
++extern int __register_atfork (void (*) (void), void (*) (void), void (*) (void), void *);
++
+ static void
+ _libpseudo_init(void) {
+ 	if (!_libpseudo_initted)
+-		pthread_atfork(NULL, NULL, libpseudo_atfork_child);
++		__register_atfork (NULL, NULL, libpseudo_atfork_child, &__dso_handle == NULL ? NULL : __dso_handle);
+ 
+ 	pseudo_getlock();
+ 	pseudo_antimagic();

meta/recipes-devtools/pseudo/pseudo_git.bb

@@ -5,6 +5,10 @@ SRC_URI = "git://git.yoctoproject.org/pseudo;branch=oe-core \
            file://fallback-passwd \
            file://fallback-group \
            "
+SRC_URI:append:class-native = " \
+    http://downloads.yoctoproject.org/mirror/sources/pseudo-prebuilt-2.33.tar.xz;subdir=git/prebuilt;name=prebuilt \
+    file://older-glibc-symbols.patch"
+SRC_URI[prebuilt.sha256sum] = "ed9f456856e9d86359f169f46a70ad7be4190d6040282b84c8d97b99072485aa"
 
 SRCREV = "b988b0a6b8afd8d459bc9a2528e834f63a3d59b2"
 S = "${WORKDIR}/git"