Bug 1464954 - Print buildstatus messages when building in the top source directory. r=gps

MozReview-Commit-ID: F28u8k2Z24f

--HG--
extra : rebase_source : bcf77bdcfb37c5a43261e773d9b444c5844ae4d8

python/mozbuild/mozbuild/controller/building.py

@@ -1108,10 +1108,11 @@ class BuildDriver(MozbuildObject):
                     # tree builds because they aren't reliable there. This
                     # could potentially be fixed if the build monitor were more
                     # intelligent about encountering undefined state.
+                    no_build_status = b'1' if make_dir is not None else b''
                     status = self._run_make(directory=make_dir, target=make_target,
                         line_handler=output.on_line, log=False, print_directory=False,
                         ensure_exit_code=False, num_jobs=jobs, silent=not verbose,
-                        append_env={b'NO_BUILDSTATUS_MESSAGES': b'1'},
+                        append_env={b'NO_BUILDSTATUS_MESSAGES': no_build_status},
                         keep_going=keep_going)
 
                     if status != 0: