svn fetcher: warn people to switch to SRCREV

as noted by rp in ac00ca89a4e43cd4f38ba86455079d31be78e644

(Bitbake rev: 8da9744fcdf856abebcfbe9e3bc1b8cf07bc317b)

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

bitbake/lib/bb/fetch/svn.py

@@ -60,13 +60,14 @@ class Svn(Fetch):
             ud.date = ud.parm['date']
             ud.revision = ""
         else:
-            #
             # ***Nasty hack***
             # If DATE in unexpanded PV, use ud.date (which is set from SRCDATE)
             # Should warn people to switch to SRCREV here
             #
             pv = data.getVar("PV", d, 0)
             if "DATE" in pv:
+                f = data.getVar("FILE", d, 1)
+                logger.warn("You should switch to SRCREV; pv='%s' in %s" % (pv, f))
                 ud.revision = ""
             else:
                 rev = Fetch.srcrev_internal_helper(ud, d)