Re: targets in subdirectories

[Paul Smith]

On Wed, 2007-06-20 at 06:29 -0700, kilgore trout wrote:
> When the commands are echoed to the console, $@ expands to CAN_init.o
> rather than c:/ashell/trunk/ashell/build_dir/CAN_init.o  (where
> $(BUILD_DIR) is c:/ashell/trunk/ashell/build_dir ).  So that the
> compiler output is put in the local (current) directory rather than
> $(BUILD_DIR)/CAN_init.o .

Are you SURE it's using that rule?  I suspect it's really using the
default %.o : %.c rule.  When it prints the commands does it show the
mkdir, etc. part?


You have only provided half of the information needed to debug your
problem: you show the rule but not the prerequisites that match it.

Probably you have this somewhere in your makefile:

        foo: foo.o bar.o baz.o

You can't do that: "foo.o" cannot match a pattern "$(BUILD_DIR)/%.o".

You have to write:

        foo: $(BUILD_DIR)/foo.o $(BUILD_DIR)/bar.o $(BUILD_DIR)/baz.o

or use make functions like $(addprefix ...).

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