From: "Philip Guenther" <address@hidden>
To: "sharan basappa" <address@hidden>
CC: address@hidden
Subject: Re: trouble cleaning the right files ..
Date: Mon, 18 Jun 2007 04:22:47 -0600
On 6/18/07, sharan basappa <address@hidden> wrote:
...
Each module make appends its clean target to clean variable as :
clean += clean_dir1 .. so eventually clean_all looks like
clean_all : clean_dir1 clean_dir2
clean_dir1 (for example) rule is :
clean_dir1 :
\rm $(local_objs)
The expansion of variables in command rules is always deferred until
the command is run. That doesn't take place until the makefiles have
been completely parsed. Ergo, unless you use a target-specific
variable assignment, the above will use the value of local_objs that
was last set during the parsing. That's what's causing your problem.
There are two solutions:
1) use target-specific variables. Check out the info pages for the details
(just search for "target-specific"), but the quick-n-dirty kludge would
be to add something like:
clean_dir1: local_objs := $(local_objs)
near where the clean_dir1 target is defined and similar with other
such targets.
2) instead of using the same variable for all the directories, use a
different
name for each:
local_objs_dir1 := $(subst .c,.o,$(local_src))
dir1: $(local_objs_dir1)
clean_dir1:
$(RM) $(local_objs_dir1)
That can be mostly automated using computed names:
local_objs_$(local_dir) := $(subst .c,.o,$(local_src))
dir1: $(local_objs_$(local_dir))
clean_dir1:
$(RM) $(local_objs_$(subst clean_,,$@))
...but that's probably only worthwhile if you factor out that code
into a file
that each submakefile then included.
Philip Guenther