Ceph

make tags fails with:

make[2]: *** No rule to make target `dummy.cc', needed by `tags-am'.  Stop.

This is similar to #8530, except that the new additions for unittest_librbd and ceph_test_librbd don't use common/dummy.cc, but rather just dummy.cc. Adding common/ fixes the problem:

--- a/src/test/Makefile.am
+++ b/src/test/Makefile.am
@@ -785,7 +785,7 @@ librbd_test_la_CXXFLAGS = $(UNITTEST_CXXFLAGS)
 noinst_LTLIBRARIES += librbd_test.la

 unittest_librbd_SOURCES =
-nodist_EXTRA_unittest_librbd_SOURCES = dummy.cc
+nodist_EXTRA_unittest_librbd_SOURCES = common/dummy.cc
 unittest_librbd_LDADD = \
        librbd_test.la librbd_api.la librbd_internal.la $(LIBRBD_TYPES) \
        libcls_rbd_client.la libcls_lock_client.la \
@@ -795,7 +795,7 @@ unittest_librbd_LDADD = \
 check_PROGRAMS += unittest_librbd

 ceph_test_librbd_SOURCES =
-nodist_EXTRA_ceph_test_librbd_SOURCES = dummy.cc
+nodist_EXTRA_ceph_test_librbd_SOURCES = common/dummy.cc
 ceph_test_librbd_LDADD = \
        librbd_test.la librbd_api.la librbd_internal.la $(LIBRBD_TYPES) \
         libcls_rbd_client.la libcls_lock_client.la \

Maybe we should also add "make tags" to make check?