diff --git a/poky/meta/lib/oe/elf.py b/poky/meta/lib/oe/elf.py
index 2562cea..df0a459 100644
--- a/poky/meta/lib/oe/elf.py
+++ b/poky/meta/lib/oe/elf.py
@@ -15,13 +15,13 @@
                         "aarch64" :   (183,    0,    0,          True,          64),
                         "aarch64_be" :(183,    0,    0,          False,         64),
                         "i586" :      (3,      0,    0,          True,          32),
+                        "i686" :      (3,      0,    0,          True,          32),
                         "x86_64":     (62,     0,    0,          True,          64),
                         "epiphany":   (4643,   0,    0,          True,          32),
                         "lm32":       (138,    0,    0,          False,         32),
                         "mips":       ( 8,     0,    0,          False,         32),
                         "mipsel":     ( 8,     0,    0,          True,          32),
                         "microblaze":  (189,   0,    0,          False,         32),
-                        "microblazeeb":(189,   0,    0,          False,         32),
                         "microblazeel":(189,   0,    0,          True,          32),
                         "powerpc":    (20,     0,    0,          False,         32),
                         "riscv32":    (243,    0,    0,          True,          32),
@@ -34,6 +34,7 @@
                         "armeb":      (40,    97,    0,          False,         32),
                         "powerpc":    (20,     0,    0,          False,         32),
                         "powerpc64":  (21,     0,    0,          False,         64),
+                        "powerpc64le":  (21,     0,    0,          True,         64),
                         "i386":       ( 3,     0,    0,          True,          32),
                         "i486":       ( 3,     0,    0,          True,          32),
                         "i586":       ( 3,     0,    0,          True,          32),
@@ -58,7 +59,6 @@
                         "sh4":        (42,     0,    0,          True,          32),
                         "sparc":      ( 2,     0,    0,          False,         32),
                         "microblaze":  (189,   0,    0,          False,         32),
-                        "microblazeeb":(189,   0,    0,          False,         32),
                         "microblazeel":(189,   0,    0,          True,          32),
                       },
             "linux-musl" : { 
@@ -68,6 +68,7 @@
                         "armeb":      (  40,    97,    0,          False,         32),
                         "powerpc":    (  20,     0,    0,          False,         32),
                         "powerpc64":  (  21,     0,    0,          False,         64),
+                        "powerpc64le":  (21,     0,    0,          True,         64),
                         "i386":       (   3,     0,    0,          True,          32),
                         "i486":       (   3,     0,    0,          True,          32),
                         "i586":       (   3,     0,    0,          True,          32),
@@ -78,7 +79,6 @@
                         "mips64":     (   8,     0,    0,          False,         64),
                         "mips64el":   (   8,     0,    0,          True,          64),
                         "microblaze":  (189,     0,    0,          False,         32),
-                        "microblazeeb":(189,     0,    0,          False,         32),
                         "microblazeel":(189,     0,    0,          True,          32),
                         "riscv32":    (243,      0,    0,          True,          32),
                         "riscv64":    (243,      0,    0,          True,          64),
diff --git a/poky/meta/lib/oe/package.py b/poky/meta/lib/oe/package.py
index b8585d4..dd700cb 100644
--- a/poky/meta/lib/oe/package.py
+++ b/poky/meta/lib/oe/package.py
@@ -283,36 +283,3 @@
                         shlib_provider[s[0]] = {}
                     shlib_provider[s[0]][s[1]] = (dep_pkg, s[2])
     return shlib_provider
-
-
-def npm_split_package_dirs(pkgdir):
-    """
-    Work out the packages fetched and unpacked by BitBake's npm fetcher
-    Returns a dict of packagename -> (relpath, package.json) ordered
-    such that it is suitable for use in PACKAGES and FILES
-    """
-    from collections import OrderedDict
-    import json
-    packages = {}
-    for root, dirs, files in os.walk(pkgdir):
-        if os.path.basename(root) == 'node_modules':
-            for dn in dirs:
-                relpth = os.path.relpath(os.path.join(root, dn), pkgdir)
-                pkgitems = ['${PN}']
-                for pathitem in relpth.split('/'):
-                    if pathitem == 'node_modules':
-                        continue
-                    pkgitems.append(pathitem)
-                pkgname = '-'.join(pkgitems).replace('_', '-')
-                pkgname = pkgname.replace('@', '')
-                pkgfile = os.path.join(root, dn, 'package.json')
-                data = None
-                if os.path.exists(pkgfile):
-                    with open(pkgfile, 'r') as f:
-                        data = json.loads(f.read())
-                    packages[pkgname] = (relpth, data)
-    # We want the main package for a module sorted *after* its subpackages
-    # (so that it doesn't otherwise steal the files for the subpackage), so
-    # this is a cheap way to do that whilst still having an otherwise
-    # alphabetical sort
-    return OrderedDict((key, packages[key]) for key in sorted(packages, key=lambda pkg: pkg + '~'))
diff --git a/poky/meta/lib/oe/package_manager.py b/poky/meta/lib/oe/package_manager.py
index 4ff19cf..b066041 100644
--- a/poky/meta/lib/oe/package_manager.py
+++ b/poky/meta/lib/oe/package_manager.py
@@ -40,8 +40,9 @@
     ver = ""
     filename = ""
     dep = []
+    prov = []
     pkgarch = ""
-    for line in cmd_output.splitlines():
+    for line in cmd_output.splitlines()+['']:
         line = line.rstrip()
         if ':' in line:
             if line.startswith("Package: "):
@@ -64,6 +65,10 @@
                     dep.append("%s [REC]" % recommend)
             elif line.startswith("PackageArch: "):
                 pkgarch = line.split(": ")[1]
+            elif line.startswith("Provides: "):
+                provides = verregex.sub('', line.split(": ")[1])
+                for provide in provides.split(", "):
+                    prov.append(provide)
 
         # When there is a blank line save the package information
         elif not line:
@@ -72,20 +77,15 @@
                 filename = "%s_%s_%s.ipk" % (pkg, ver, arch)
             if pkg:
                 output[pkg] = {"arch":arch, "ver":ver,
-                        "filename":filename, "deps": dep, "pkgarch":pkgarch }
+                        "filename":filename, "deps": dep, "pkgarch":pkgarch, "provs": prov}
             pkg = ""
             arch = ""
             ver = ""
             filename = ""
             dep = []
+            prov = []
             pkgarch = ""
 
-    if pkg:
-        if not filename:
-            filename = "%s_%s_%s.ipk" % (pkg, ver, arch)
-        output[pkg] = {"arch":arch, "ver":ver,
-                "filename":filename, "deps": dep }
-
     return output
 
 def failed_postinsts_abort(pkgs, log_path):
@@ -107,6 +107,7 @@
         "sh4": ["--uint32-align=4", "--big-endian"],
         "powerpc": ["--uint32-align=4", "--big-endian"],
         "powerpc64": ["--uint32-align=4", "--big-endian"],
+        "powerpc64le": ["--uint32-align=4", "--little-endian"],
         "mips": ["--uint32-align=4", "--big-endian"],
         "mipsisa32r6": ["--uint32-align=4", "--big-endian"],
         "mips64": ["--uint32-align=4", "--big-endian"],
@@ -131,7 +132,7 @@
     env = dict(os.environ)
     env["LOCALEARCHIVE"] = oe.path.join(localedir, "locale-archive")
 
-    for name in os.listdir(localedir):
+    for name in sorted(os.listdir(localedir)):
         path = os.path.join(localedir, name)
         if os.path.isdir(path):
             cmd = ["cross-localedef", "--verbose"]
@@ -360,7 +361,7 @@
                "--admindir=%s/var/lib/dpkg" % self.rootfs_dir,
                "-W"]
 
-        cmd.append("-f=Package: ${Package}\nArchitecture: ${PackageArch}\nVersion: ${Version}\nFile: ${Package}_${Version}_${Architecture}.deb\nDepends: ${Depends}\nRecommends: ${Recommends}\n\n")
+        cmd.append("-f=Package: ${Package}\nArchitecture: ${PackageArch}\nVersion: ${Version}\nFile: ${Package}_${Version}_${Architecture}.deb\nDepends: ${Depends}\nRecommends: ${Recommends}\nProvides: ${Provides}\n\n")
 
         try:
             cmd_output = subprocess.check_output(cmd, stderr=subprocess.STDOUT).strip().decode("utf-8")
@@ -580,6 +581,11 @@
         # oe-pkgdata-util reads it from a file
         with tempfile.NamedTemporaryFile(mode="w+", prefix="installed-pkgs") as installed_pkgs:
             pkgs = self.list_installed()
+
+            provided_pkgs = set()
+            for pkg in pkgs.values():
+                provided_pkgs |= set(pkg.get('provs', []))
+
             output = oe.utils.format_pkg_list(pkgs, "arch")
             installed_pkgs.write(output)
             installed_pkgs.flush()
@@ -591,10 +597,15 @@
             if exclude:
                 cmd.extend(['--exclude=' + '|'.join(exclude.split())])
             try:
-                bb.note("Installing complementary packages ...")
                 bb.note('Running %s' % cmd)
                 complementary_pkgs = subprocess.check_output(cmd, stderr=subprocess.STDOUT).decode("utf-8")
-                self.install(complementary_pkgs.split(), attempt_only=True)
+                complementary_pkgs = set(complementary_pkgs.split())
+                skip_pkgs = sorted(complementary_pkgs & provided_pkgs)
+                install_pkgs = sorted(complementary_pkgs - provided_pkgs)
+                bb.note("Installing complementary packages ... %s (skipped already provided packages %s)" % (
+                    ' '.join(install_pkgs),
+                    ' '.join(skip_pkgs)))
+                self.install(install_pkgs, attempt_only=True)
             except subprocess.CalledProcessError as e:
                 bb.fatal("Could not compute complementary packages list. Command "
                          "'%s' returned %d:\n%s" %
@@ -768,6 +779,8 @@
         # This prevents accidental matching against libsolv's built-in policies
         if len(archs) <= 1:
             archs = archs + ["bogusarch"]
+        # This architecture needs to be upfront so that packages using it are properly prioritized
+        archs = ["sdk_provides_dummy_target"] + archs
         confdir = "%s/%s" %(self.target_rootfs, "etc/dnf/vars/")
         bb.utils.mkdirhier(confdir)
         open(confdir + "arch", 'w').write(":".join(archs))
@@ -1621,7 +1634,7 @@
 
         os.environ['APT_CONFIG'] = self.apt_conf_file
 
-        cmd = "%s %s install --force-yes --allow-unauthenticated %s" % \
+        cmd = "%s %s install --force-yes --allow-unauthenticated --no-remove %s" % \
               (self.apt_get_cmd, self.apt_args, ' '.join(pkgs))
 
         try:
@@ -1783,8 +1796,7 @@
             open(os.path.join(target_dpkg_dir, "available"), "w+").close()
 
     def remove_packaging_data(self):
-        bb.utils.remove(os.path.join(self.target_rootfs,
-                                     self.d.getVar('opkglibdir')), True)
+        bb.utils.remove(self.target_rootfs + self.d.getVar('opkglibdir'), True)
         bb.utils.remove(self.target_rootfs + "/var/lib/dpkg/", True)
 
     def fix_broken_dependencies(self):
diff --git a/poky/meta/lib/oe/packagegroup.py b/poky/meta/lib/oe/packagegroup.py
index 2419cbb..8fcaecd 100644
--- a/poky/meta/lib/oe/packagegroup.py
+++ b/poky/meta/lib/oe/packagegroup.py
@@ -5,17 +5,11 @@
 import itertools
 
 def is_optional(feature, d):
-    packages = d.getVar("FEATURE_PACKAGES_%s" % feature)
-    if packages:
-        return bool(d.getVarFlag("FEATURE_PACKAGES_%s" % feature, "optional"))
-    else:
-        return bool(d.getVarFlag("PACKAGE_GROUP_%s" % feature, "optional"))
+    return bool(d.getVarFlag("FEATURE_PACKAGES_%s" % feature, "optional"))
 
 def packages(features, d):
     for feature in features:
         packages = d.getVar("FEATURE_PACKAGES_%s" % feature)
-        if not packages:
-            packages = d.getVar("PACKAGE_GROUP_%s" % feature)
         for pkg in (packages or "").split():
             yield pkg
 
diff --git a/poky/meta/lib/oe/path.py b/poky/meta/lib/oe/path.py
index fa209b9..0829724 100644
--- a/poky/meta/lib/oe/path.py
+++ b/poky/meta/lib/oe/path.py
@@ -99,7 +99,22 @@
     if os.path.isdir(src) and not len(os.listdir(src)):
         return
 
-    if (os.stat(src).st_dev ==  os.stat(dst).st_dev):
+    canhard = False
+    testfile = None
+    for root, dirs, files in os.walk(src):
+        if len(files):
+            testfile = os.path.join(root, files[0])
+            break
+
+    if testfile is not None:
+        try:
+            os.link(testfile, os.path.join(dst, 'testfile'))
+            os.unlink(os.path.join(dst, 'testfile'))
+            canhard = True
+        except Exception as e:
+            bb.debug(2, "Hardlink test failed with " + str(e))
+
+    if (canhard):
         # Need to copy directories only with tar first since cp will error if two 
         # writers try and create a directory at the same time
         cmd = "cd %s; find . -type d -print | tar --xattrs --xattrs-include='*' -cf - -S -C %s -p --no-recursion --files-from - | tar --xattrs --xattrs-include='*' -xhf - -C %s" % (src, src, dst)
@@ -121,12 +136,9 @@
 def copyhardlink(src, dst):
     """Make a hard link when possible, otherwise copy."""
 
-    # We need to stat the destination directory as the destination file probably
-    # doesn't exist yet.
-    dstdir = os.path.dirname(dst)
-    if os.stat(src).st_dev == os.stat(dstdir).st_dev:
+    try:
         os.link(src, dst)
-    else:
+    except OSError:
         shutil.copy(src, dst)
 
 def remove(path, recurse=True):
diff --git a/poky/meta/lib/oe/prservice.py b/poky/meta/lib/oe/prservice.py
index b1132cc..2d3c9c7 100644
--- a/poky/meta/lib/oe/prservice.py
+++ b/poky/meta/lib/oe/prservice.py
@@ -3,6 +3,10 @@
 #
 
 def prserv_make_conn(d, check = False):
+    # Otherwise this fails when called from recipes which e.g. inherit python3native (which sets _PYTHON_SYSCONFIGDATA_NAME) with:
+    # No module named '_sysconfigdata'
+    if '_PYTHON_SYSCONFIGDATA_NAME' in os.environ:
+        del os.environ['_PYTHON_SYSCONFIGDATA_NAME']
     import prserv.serv
     host_params = list([_f for _f in (d.getVar("PRSERV_HOST") or '').split(':') if _f])
     try:
@@ -79,41 +83,40 @@
     df = d.getVar('PRSERV_DUMPFILE')
     #write data
     lf = bb.utils.lockfile("%s.lock" % df)
-    f = open(df, "a")
-    if metainfo:
-        #dump column info 
-        f.write("#PR_core_ver = \"%s\"\n\n" % metainfo['core_ver']);
-        f.write("#Table: %s\n" % metainfo['tbl_name'])
-        f.write("#Columns:\n")
-        f.write("#name      \t type    \t notn    \t dflt    \t pk\n")
-        f.write("#----------\t --------\t --------\t --------\t ----\n")
-        for i in range(len(metainfo['col_info'])):
-            f.write("#%10s\t %8s\t %8s\t %8s\t %4s\n" % 
-                    (metainfo['col_info'][i]['name'], 
-                     metainfo['col_info'][i]['type'], 
-                     metainfo['col_info'][i]['notnull'], 
-                     metainfo['col_info'][i]['dflt_value'], 
-                     metainfo['col_info'][i]['pk']))
-        f.write("\n")
+    with open(df, "a") as f:
+        if metainfo:
+            #dump column info
+            f.write("#PR_core_ver = \"%s\"\n\n" % metainfo['core_ver']);
+            f.write("#Table: %s\n" % metainfo['tbl_name'])
+            f.write("#Columns:\n")
+            f.write("#name      \t type    \t notn    \t dflt    \t pk\n")
+            f.write("#----------\t --------\t --------\t --------\t ----\n")
+            for i in range(len(metainfo['col_info'])):
+                f.write("#%10s\t %8s\t %8s\t %8s\t %4s\n" %
+                        (metainfo['col_info'][i]['name'],
+                         metainfo['col_info'][i]['type'],
+                         metainfo['col_info'][i]['notnull'],
+                         metainfo['col_info'][i]['dflt_value'],
+                         metainfo['col_info'][i]['pk']))
+            f.write("\n")
 
-    if lockdown:
-        f.write("PRSERV_LOCKDOWN = \"1\"\n\n")
+        if lockdown:
+            f.write("PRSERV_LOCKDOWN = \"1\"\n\n")
 
-    if datainfo:
-        idx = {}
-        for i in range(len(datainfo)):
-            pkgarch = datainfo[i]['pkgarch']
-            value = datainfo[i]['value']
-            if pkgarch not in idx:
-                idx[pkgarch] = i
-            elif value > datainfo[idx[pkgarch]]['value']:
-                idx[pkgarch] = i
-            f.write("PRAUTO$%s$%s$%s = \"%s\"\n" % 
-                (str(datainfo[i]['version']), pkgarch, str(datainfo[i]['checksum']), str(value)))
-        if not nomax:
-            for i in idx:
-                f.write("PRAUTO_%s_%s = \"%s\"\n" % (str(datainfo[idx[i]]['version']),str(datainfo[idx[i]]['pkgarch']),str(datainfo[idx[i]]['value'])))
-    f.close()
+        if datainfo:
+            idx = {}
+            for i in range(len(datainfo)):
+                pkgarch = datainfo[i]['pkgarch']
+                value = datainfo[i]['value']
+                if pkgarch not in idx:
+                    idx[pkgarch] = i
+                elif value > datainfo[idx[pkgarch]]['value']:
+                    idx[pkgarch] = i
+                f.write("PRAUTO$%s$%s$%s = \"%s\"\n" %
+                    (str(datainfo[i]['version']), pkgarch, str(datainfo[i]['checksum']), str(value)))
+            if not nomax:
+                for i in idx:
+                    f.write("PRAUTO_%s_%s = \"%s\"\n" % (str(datainfo[idx[i]]['version']),str(datainfo[idx[i]]['pkgarch']),str(datainfo[idx[i]]['value'])))
     bb.utils.unlockfile(lf)
 
 def prserv_check_avail(d):
diff --git a/poky/meta/lib/oe/qa.py b/poky/meta/lib/oe/qa.py
index 21066c4..ea831b9 100644
--- a/poky/meta/lib/oe/qa.py
+++ b/poky/meta/lib/oe/qa.py
@@ -41,13 +41,15 @@
     def __init__(self, name):
         self.name = name
         self.objdump_output = {}
+        self.data = None
 
     # Context Manager functions to close the mmap explicitly
     def __enter__(self):
         return self
 
     def __exit__(self, exc_type, exc_value, traceback):
-        self.data.close()
+        if self.data:
+            self.data.close()
 
     def open(self):
         with open(self.name, "rb") as f:
diff --git a/poky/meta/lib/oe/recipeutils.py b/poky/meta/lib/oe/recipeutils.py
index 630ae96..732420e 100644
--- a/poky/meta/lib/oe/recipeutils.py
+++ b/poky/meta/lib/oe/recipeutils.py
@@ -421,6 +421,8 @@
             # Ensure we handle class-target if we're dealing with one of the variants
             variants.append('target')
             for variant in variants:
+                if variant.startswith("devupstream"):
+                    localdata.setVar('SRCPV', 'git')
                 localdata.setVar('CLASSOVERRIDE', 'class-%s' % variant)
                 fetch_urls(localdata)
 
@@ -1059,7 +1061,6 @@
     data_copy_list = []
     copy_vars = ('SRC_URI',
                  'PV',
-                 'GITDIR',
                  'DL_DIR',
                  'PN',
                  'CACHE',
diff --git a/poky/meta/lib/oe/rootfs.py b/poky/meta/lib/oe/rootfs.py
index c62fa5f..cd65e62 100644
--- a/poky/meta/lib/oe/rootfs.py
+++ b/poky/meta/lib/oe/rootfs.py
@@ -126,17 +126,16 @@
             bb.utils.mkdirhier(self.image_rootfs + os.path.dirname(dir))
             shutil.copytree(self.image_rootfs + '-orig' + dir, self.image_rootfs + dir, symlinks=True)
 
-        cpath = oe.cachedpath.CachedPath()
         # Copy files located in /usr/lib/debug or /usr/src/debug
         for dir in ["/usr/lib/debug", "/usr/src/debug"]:
             src = self.image_rootfs + '-orig' + dir
-            if cpath.exists(src):
+            if os.path.exists(src):
                 dst = self.image_rootfs + dir
                 bb.utils.mkdirhier(os.path.dirname(dst))
                 shutil.copytree(src, dst)
 
         # Copy files with suffix '.debug' or located in '.debug' dir.
-        for root, dirs, files in cpath.walk(self.image_rootfs + '-orig'):
+        for root, dirs, files in os.walk(self.image_rootfs + '-orig'):
             relative_dir = root[len(self.image_rootfs + '-orig'):]
             for f in files:
                 if f.endswith('.debug') or '/.debug' in relative_dir:
diff --git a/poky/meta/lib/oe/sstatesig.py b/poky/meta/lib/oe/sstatesig.py
index c566ce5..d24e373 100644
--- a/poky/meta/lib/oe/sstatesig.py
+++ b/poky/meta/lib/oe/sstatesig.py
@@ -103,6 +103,8 @@
         self.unlockedrecipes = (data.getVar("SIGGEN_UNLOCKED_RECIPES") or
                                 "").split()
         self.unlockedrecipes = { k: "" for k in self.unlockedrecipes }
+        self.buildarch = data.getVar('BUILD_ARCH')
+        self._internal = False
         pass
 
     def tasks_resolved(self, virtmap, virtpnmap, dataCache):
@@ -140,8 +142,27 @@
         self.dump_lockedsigs(sigfile)
         return super(bb.siggen.SignatureGeneratorBasicHash, self).dump_sigs(dataCache, options)
 
+    def prep_taskhash(self, tid, deps, dataCache):
+        super().prep_taskhash(tid, deps, dataCache)
+        if hasattr(self, "extramethod"):
+            (_, _, _, fn) = bb.runqueue.split_tid_mcfn(tid)
+            inherits = " ".join(dataCache.inherits[fn])    
+            if inherits.find("/native.bbclass") != -1 or inherits.find("/cross.bbclass") != -1:
+                self.extramethod[tid] = ":" + self.buildarch
+
     def get_taskhash(self, tid, deps, dataCache):
-        h = super(bb.siggen.SignatureGeneratorBasicHash, self).get_taskhash(tid, deps, dataCache)
+        if tid in self.lockedhashes:
+            if self.lockedhashes[tid]:
+                return self.lockedhashes[tid]
+            else:
+                return super().get_taskhash(tid, deps, dataCache)
+
+        # get_taskhash will call get_unihash internally in the parent class, we 
+        # need to disable our filter of it whilst this runs else
+        # incorrect hashes can be calculated.
+        self._internal = True
+        h = super().get_taskhash(tid, deps, dataCache)
+        self._internal = False
 
         (mc, _, task, fn) = bb.runqueue.split_tid_mcfn(tid)
 
@@ -169,8 +190,9 @@
                 h_locked = self.lockedsigs[recipename][task][0]
                 var = self.lockedsigs[recipename][task][1]
                 self.lockedhashes[tid] = h_locked
-                unihash = super().get_unihash(tid)
-                self.taskhash[tid] = h_locked
+                self._internal = True
+                unihash = self.get_unihash(tid)
+                self._internal = False
                 #bb.warn("Using %s %s %s" % (recipename, task, h))
 
                 if h != h_locked and h_locked != unihash:
@@ -178,17 +200,24 @@
                                           % (recipename, task, h, h_locked, var))
 
                 return h_locked
+
+        self.lockedhashes[tid] = False
         #bb.warn("%s %s %s" % (recipename, task, h))
         return h
 
+    def get_stampfile_hash(self, tid):
+        if tid in self.lockedhashes and self.lockedhashes[tid]:
+            return self.lockedhashes[tid]
+        return super().get_stampfile_hash(tid)
+
     def get_unihash(self, tid):
-        if tid in self.lockedhashes:
+        if tid in self.lockedhashes and self.lockedhashes[tid] and not self._internal:
             return self.lockedhashes[tid]
         return super().get_unihash(tid)
 
     def dump_sigtask(self, fn, task, stampbase, runtime):
         tid = fn + ":" + task
-        if tid in self.lockedhashes:
+        if tid in self.lockedhashes and self.lockedhashes[tid]:
             return
         super(bb.siggen.SignatureGeneratorBasicHash, self).dump_sigtask(fn, task, stampbase, runtime)
 
@@ -448,11 +477,14 @@
     h = hashlib.sha256()
     prev_dir = os.getcwd()
     include_owners = os.environ.get('PSEUDO_DISABLED') == '0'
+    extra_content = d.getVar('HASHEQUIV_HASH_VERSION')
 
     try:
         os.chdir(path)
 
         update_hash("OEOuthashBasic\n")
+        if extra_content:
+            update_hash(extra_content + "\n")
 
         # It is only currently useful to get equivalent hashes for things that
         # can be restored from sstate. Since the sstate object is named using
@@ -512,8 +544,12 @@
                     add_perm(stat.S_IXOTH, 'x')
 
                 if include_owners:
-                    update_hash(" %10s" % pwd.getpwuid(s.st_uid).pw_name)
-                    update_hash(" %10s" % grp.getgrgid(s.st_gid).gr_name)
+                    try:
+                        update_hash(" %10s" % pwd.getpwuid(s.st_uid).pw_name)
+                        update_hash(" %10s" % grp.getgrgid(s.st_gid).gr_name)
+                    except KeyError:
+                        bb.warn("KeyError in %s" % path)
+                        raise
 
                 update_hash(" ")
                 if stat.S_ISBLK(s.st_mode) or stat.S_ISCHR(s.st_mode):
diff --git a/poky/meta/lib/oe/utils.py b/poky/meta/lib/oe/utils.py
index 652b2be..13f4271 100644
--- a/poky/meta/lib/oe/utils.py
+++ b/poky/meta/lib/oe/utils.py
@@ -169,7 +169,7 @@
     """
     return bb.utils.contains_any("DISTRO_FEATURES", features, truevalue, falsevalue, d)
 
-def parallel_make(d):
+def parallel_make(d, makeinst=False):
     """
     Return the integer value for the number of parallel threads to use when
     building, scraped out of PARALLEL_MAKE. If no parallelization option is
@@ -177,7 +177,10 @@
 
     e.g. if PARALLEL_MAKE = "-j 10", this will return 10 as an integer.
     """
-    pm = (d.getVar('PARALLEL_MAKE') or '').split()
+    if makeinst:
+        pm = (d.getVar('PARALLEL_MAKEINST') or '').split()
+    else:
+        pm = (d.getVar('PARALLEL_MAKE') or '').split()
     # look for '-j' and throw other options (e.g. '-l') away
     while pm:
         opt = pm.pop(0)
@@ -192,7 +195,7 @@
 
     return None
 
-def parallel_make_argument(d, fmt, limit=None):
+def parallel_make_argument(d, fmt, limit=None, makeinst=False):
     """
     Helper utility to construct a parallel make argument from the number of
     parallel threads specified in PARALLEL_MAKE.
@@ -205,7 +208,7 @@
     e.g. if PARALLEL_MAKE = "-j 10", parallel_make_argument(d, "-n %d") will return
     "-n 10"
     """
-    v = parallel_make(d)
+    v = parallel_make(d, makeinst)
     if v:
         if limit:
             v = min(limit, v)
@@ -245,9 +248,10 @@
     trimmed = ".".join(parts[:num_parts])
     return trimmed
 
-def cpu_count():
+def cpu_count(at_least=1):
     import multiprocessing
-    return multiprocessing.cpu_count()
+    cpus = multiprocessing.cpu_count()
+    return max(cpus, at_least)
 
 def execute_pre_post_process(d, cmds):
     if cmds is None:
@@ -369,6 +373,37 @@
 
     return output_str
 
+
+# Helper function to get the host compiler version
+# Do not assume the compiler is gcc
+def get_host_compiler_version(d, taskcontextonly=False):
+    import re, subprocess
+
+    if taskcontextonly and d.getVar('BB_WORKERCONTEXT') != '1':
+        return
+
+    compiler = d.getVar("BUILD_CC")
+    # Get rid of ccache since it is not present when parsing.
+    if compiler.startswith('ccache '):
+        compiler = compiler[7:]
+    try:
+        env = os.environ.copy()
+        # datastore PATH does not contain session PATH as set by environment-setup-...
+        # this breaks the install-buildtools use-case
+        # env["PATH"] = d.getVar("PATH")
+        output = subprocess.check_output("%s --version" % compiler, \
+                    shell=True, env=env, stderr=subprocess.STDOUT).decode("utf-8")
+    except subprocess.CalledProcessError as e:
+        bb.fatal("Error running %s --version: %s" % (compiler, e.output.decode("utf-8")))
+
+    match = re.match(r".* (\d+\.\d+)\.\d+.*", output.split('\n')[0])
+    if not match:
+        bb.fatal("Can't get compiler version from %s --version output" % compiler)
+
+    version = match.group(1)
+    return compiler, version
+
+
 def host_gcc_version(d, taskcontextonly=False):
     import re, subprocess
 
@@ -387,7 +422,7 @@
     except subprocess.CalledProcessError as e:
         bb.fatal("Error running %s --version: %s" % (compiler, e.output.decode("utf-8")))
 
-    match = re.match(r".* (\d\.\d)\.\d.*", output.split('\n')[0])
+    match = re.match(r".* (\d+\.\d+)\.\d+.*", output.split('\n')[0])
     if not match:
         bb.fatal("Can't get compiler version from %s --version output" % compiler)