Update mock makefiles to work with libpq objfiles

mock.mk before this has trouble to filter out mocked objects from
src/backend/objfiles.txt, because the filenames in it have redundant
"src/backend/../../" and suffix "_for_backend".

This commit removes them before mocking to make it work.

Author: adam8157

src/backend/common.mk

@@ -28,7 +28,7 @@ SUBSYS.o: $(SUBDIROBJS) $(OBJS)
 
 objfiles.txt: Makefile $(SUBDIROBJS) $(OBJS)
 # Don't rebuild the list if only the OBJS have changed.
-	$(if $(filter-out $(OBJS),$?),( $(if $(SUBDIROBJS),cat $(SUBDIROBJS); )echo $(addprefix $(subdir)/,$(OBJS)) ) >$@,touch $@)
+	$(if $(filter-out $(OBJS),$?),( $(if $(SUBDIROBJS),cat $(SUBDIROBJS); )echo $(subst src/backend/../../,,$(addprefix $(subdir)/,$(OBJS))) ) >$@,touch $@)
 
 # make function to expand objfiles.txt contents
 expand_subsys = $(foreach file,$(1),$(if $(filter %/objfiles.txt,$(file)),$(patsubst ../../src/backend/%,%,$(addprefix $(top_builddir)/,$(shell cat $(file)))),$(file)))

src/backend/mock.mk

@@ -125,7 +125,7 @@ ALL_OBJS=$(addprefix $(top_srcdir)/, \
 # in a test program.
 #
 # The argument is a list of backend object files that should *not* be included
-BACKEND_OBJS=$(filter-out $(1), $(ALL_OBJS))
+BACKEND_OBJS=$(filter-out $(1), $(subst _for_backend,,$(ALL_OBJS)))
 
 # If we are using linker's wrap feature in unit test, add wrap flags for
 # those mocked functions

src/test/unit/mock/.gitignore

@@ -1 +1,2 @@
 backend
+interfaces