uninative: Add compatiblity version check

If glibc is newer on the host than in uninative, the failure mode is
pretty nasty for clusters where the sstate is shared, including the Yocto
Project autobuilder.

This check aborts the use of uninative in such scenarios where a newer
glibc version appears and avoids corruption of sstate caches.

We use ldd to check the glibc version since that is included in libc-bin
(or equivalent) which locales use so it should always be present.

(From OE-Core rev: d6f6101cd0ae92e8ad2dec0bcb6db5044726edf9)

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

meta/classes/uninative.bbclass

@@ -77,6 +77,11 @@ python uninative_event_fetchloader() {
                 except FileExistsError:
                     pass
 
+        # ldd output is "ldd (Ubuntu GLIBC 2.23-0ubuntu10) 2.23", extract last option from first line
+        glibcver = subprocess.check_output(["ldd", "--version"]).decode('utf-8').split('\n')[0].split()[-1]
+        if bb.utils.vercmp_string(d.getVar("UNINATIVE_MAXGLIBCVERSION"), glibcver) < 0:
+            raise RuntimeError("Your host glibc verson (%s) is newer than that in uninative (%s). Disabling uninative so that sstate is not corrupted." % (glibcver, d.getVar("UNINATIVE_MAXGLIBCVERSION")))
+
         cmd = d.expand("\
 mkdir -p ${UNINATIVE_STAGING_DIR}-uninative; \
 cd ${UNINATIVE_STAGING_DIR}-uninative; \
@@ -94,6 +99,8 @@ ${UNINATIVE_STAGING_DIR}-uninative/relocate_sdk.py \
 
         enable_uninative(d)
 
+    except RuntimeError as e:
+        bb.warn(str(e))
     except bb.fetch2.BBFetchException as exc:
         bb.warn("Disabling uninative as unable to fetch uninative tarball: %s" % str(exc))
         bb.warn("To build your own uninative loader, please bitbake uninative-tarball and set UNINATIVE_TARBALL appropriately.")