We don't need to rebuild objfiles.txt every time an object file changes.

So only rebuild when a makefile changes (which presumably defines the
file list somewhere), and only touch the file if an object changed. The
touch is necessary so the parent make knows something changed and
ultimately rebuilds postgres.

diff --git a/src/backend/common.mk b/src/backend/common.mk
index 9fdfa8623fc9c74ad0619f1efabc4687218b3c08..c34d62b95d80501a94b18b1615593e8a9039c872 100644 (file)
--- a/src/backend/common.mk
+++ b/src/backend/common.mk
@@ -1,7 +1,7 @@
 #
 # Common make rules for backend
 #
-# $PostgreSQL: pgsql/src/backend/common.mk,v 1.2 2008/02/25 17:55:42 petere Exp $
+# $PostgreSQL: pgsql/src/backend/common.mk,v 1.3 2008/02/26 07:20:38 petere Exp $
 #
 
 # When including this file, set OBJS to the object files created in
@@ -26,9 +26,12 @@ endif
 SUBSYS.o: $(SUBDIROBJS) $(OBJS)
        $(LD) $(LDREL) $(LDOUT) $@ $^
 
-objfiles.txt: $(SUBDIROBJS) $(OBJS)
+objfiles.txt:: $(MAKEFILE_LIST)
        ( $(if $(SUBDIROBJS),cat $(SUBDIROBJS); )echo $(addprefix $(subdir)/,$(OBJS)) ) >$@
 
+objfiles.txt:: $(SUBDIROBJS) $(OBJS)
+       touch $@
+
 # make function to expand objfiles.txt contents
 expand_subsys = $(foreach file,$(filter %/objfiles.txt,$(1)),$(patsubst ../../src/backend/%,%,$(addprefix $(top_builddir)/,$(shell cat $(file))))) $(filter-out %/objfiles.txt,$(1))