RE: Creating a header file dependency.

[Palani Chinnakannan (pals)]

Paul,
        Thank you and appreciate your help. I missed this point (in fact
always
misunderstood this, I assumed that the dependency is 1-1 pair wise ie.,
foo -> fee only
and so on...).  So, this is really not an issue but my
mis-understanding. Apologize
for the noise.... ;  Also explains the other noticed effects of why it
is updating the
file 3 times.

    Do you have any idea on how to achieve what I want?.  I really want
to have 1-1 
dependency and yet not want to write each one of them separately.  Is it
Ok if I ask this question
here ? or take it elsewhere?

pals

-----Original Message-----
From: Paul Smith [mailto:address@hidden 
Sent: Sunday, May 30, 2010 11:28 PM
To: Palani Chinnakannan (pals)
Cc: address@hidden
Subject: Re: Creating a header file dependency.

On Sun, 2010-05-30 at 22:01 -0700, Palani Chinnakannan (pals) wrote:
> $(EXPORTED_HDRS): $(EXPORT_HDRS)

If you write a rule like:

        foo bar biz : fee fie foe

then make interprets that to mean EXACTLY the same thing as:

        foo : fee fie foe
        bar : fee fie foe
        biz : fee fie foe

This explains your problem, I believe, since every target in
$(EXPORTED_HDRS) lists ALL the files in $(EXPORT_HDRS) as a
prerequisite, and so will be considered out of date if ANY file in
$(EXPORT_HDRS) is newer, and each target will be updated.

-- 
------------------------------------------------------------------------
-------
 Paul D. Smith <address@hidden>          Find some GNU make tips at:
 http://www.gnu.org                      http://make.mad-scientist.net
 "Please remain calm...I may be mad, but I am a professional." --Mad
Scientist