Is this supposed to work?
obj_dir lib_dir :
[ -d $@ ] || mkdir -p $@
obj_dir/%.o : src_dir/%.c | obj_dir
# [ -d obj_dir ] || mkdir -p obj_dir # this does work
touch $@
lib_dir/%.b : obj_dir/obj1.o obj_dir/obj2.o | lib_dir
touch $@
obj_dir/obj2.o : src_dir/obj2.c
obj_dir/obj1.o : src_dir/obj1.c
lib_dir/test.b : obj_dir/obj2.o obj_dir/obj1.o
It builds fine the first time, but for some reason. If I attempt to make a
second time, because the obj_dir directory (dependency) is newer than the
(target) obj1.o, the rule is re-run, causing the "compiler" (touch in this
simplified case) and "linker" to be re-invoked once each, despite the fact
that the this is an order-only dependency.
[EMAIL PROTECTED] ~/temp
$ mkdir src_dir
[EMAIL PROTECTED] ~/temp
$ touch src_dir/obj1.c
[EMAIL PROTECTED] ~/temp
$ touch src_dir/obj2.c
[EMAIL PROTECTED] ~/temp
$ make lib_dir/test.b
[ -d obj_dir ] || mkdir -p obj_dir
touch obj_dir/obj1.o
touch obj_dir/obj2.o
[ -d lib_dir ] || mkdir -p lib_dir
touch lib_dir/test.b
[EMAIL PROTECTED] ~/temp
$ make lib_dir/test.b
touch obj_dir/obj1.o
touch lib_dir/test.b
Please help. I don't understand this behavior.
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