Re: Makefiles don't seem to remember to rebuild everything anymore

I wrote:
> Now perhaps this is not make's fault so much as a lack of adequate
> dependency specifications.  It may be that we can still use .SECONDARY
> if we add the $(OBJS) lists as explicit targets of "make all" in backend
> directories, but I'm not sure how invasive that would be.

I experimented a bit with this:

diff --git a/src/backend/common.mk b/src/backend/common.mk
index 2e56151..822b1e9 100644
*** a/src/backend/common.mk
--- b/src/backend/common.mk
*************** SUBDIROBJS = $(SUBDIRS:%=%/$(subsysfilen
*** 20,26 ****  # top-level backend directory obviously has its own "all" target ifneq ($(subdir), src/backend)
! all: $(subsysfilename) endif  SUBSYS.o: $(SUBDIROBJS) $(OBJS)
--- 20,26 ----  # top-level backend directory obviously has its own "all" target ifneq ($(subdir), src/backend)
! all: $(subsysfilename) $(OBJS) endif  SUBSYS.o: $(SUBDIROBJS) $(OBJS)

which seems to fix the main issue, but it's still a bit wonky as far
as making objfiles.txt goes:

$ cd pgsql/src/backend/parser/
$ rm analyze.o
rm: remove regular file `analyze.o'? y
$ make
gcc -O2 -Wall -Wmissing-prototypes -Wpointer-arith -Wdeclaration-after-statement -Wendif-labels
-Wmissing-format-attribute-Wformat-security -fno-strict-aliasing -fwrapv -fexcess-precision=standard -g -I. -I.
-I../../../src/include-D_GNU_SOURCE   -c -o analyze.o analyze.c
 
$ make
touch objfiles.txt
$ make
make: Nothing to be done for `all'.

This is definitely not per make's contract, either.  I think maybe the
"Don't rebuild the list if only the OBJS have changed" hack in common.mk
is a brick or two shy of a load, but I don't know how to fix that.
        regards, tom lane