> [...]
> However, this re-links toplevel on each invokation of "make",
> even if no files have been changed at all.
> [...]
I poked into this a little more some time ago, and this is what I'm using now:
------------- Top-Level Makefile ------------------------------
MODULES := foo bar
MODULE_LIBS := $(patsubst %,-l%,$(MODULES))
MODULE_DIRS := $(patsubst %,-L%,$(MODULES))
vpath %.a $(MODULES)
.PHONY: all
all: $(MODULES) toplevel
toplevel: main.o $(MODULE_LIBS)
$(CC) -o $@ main.o $(MODULE_DIRS) $(MODULE_LIBS)
.PHONY: $(MODULES)
$(MODULES):
$(MAKE) -C $@
---------------------------------------------------------------
Paul's solution isn't quite enough - you'd need two passes of 'make' with that
(because after building eg. foo/libfoo.a, the prerequisite-check
for 'toplevel' has already been done, so 'toplevel' would not be updated,
unless you'd run 'make' a second time).
With this two-stage approach above, everything is working as it should.
--
Martin
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