bug 1363774 - error if generated old-configure is empty due to broken autoconf. r=glandium

MozReview-Commit-ID: FyS67dORiuX

--HG--
extra : rebase_source : 9d9cdf93f0a0f9d1c8cce1148b3248791cb481c9

build/moz.configure/old.configure

@@ -104,6 +104,8 @@ def prepare_configure(old_configure, mozconfig, autoconf, build_env, shell,
             shell, autoconf,
             '--localdir=%s' % os.path.dirname(old_configure),
             old_configure + '.in'])
+        if not script:
+            die('Generated old-configure is empty! Check that your autoconf 2.13 program works!')
 
         # Make old-configure append to config.log, where we put our own log.
         # This could be done with a m4 macro, but it's way easier this way