Re: Intermediate files are not being rebuilt

[Simon De Groot]

Hi Paul,

Thanks for your answer. The foo-target
approach indeed renders the target non-intermediate and causes it to be
rebuilt. Do you also have a solution to do this for pattern rules like
sub%, or would I have to define:

foo : sub1 sub2 ... subblabla ... subi'mgettingtirednow

Regards,

Simon de Groot
CAD Engineer
National Semiconductor B.V.
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The Netherlands
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01/27/2005 03:55 PM

Please respond to
"Paul D. Smith" <address@hidden>

To	"Simon De Groot" <address@hidden>
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Subject	Re: Intermediate files are not being rebuilt

%% "Simon De Groot" <address@hidden>
writes:

  sdg> Now, if I delete sub1, it will not be rebuilt the next time
I run make:

  csh> rm sub1
  csh> make
  sdg> make: Nothing to be done for `all'.

  sdg> Without the .SECONDARY target, sub1 and sub2 are deleted
  sdg> altogether after each run.

  sdg> I'm not used to this behavior when I was using Solaris'
make. Is
  sdg> there a way to enforce that prerequisites are forced to
be
  sdg> rebuilt?

Read up on intermediate files in the GNU make manual.  Since you never
reference those files directly, make considers them to be intermediate
files which are not themselves required, but only used as a stepping
stone to a different target.  So, if A -> B -> C, and if B is
not
required as a final target, and if A is older than C, then make won't
create B even if it doesn't exist, since C doesn't need to be updated.
If make DID create B, then it would have to recreate C (since B is
newer) and since A has not been changed (and B is not required) there's
no reason to do that.


Anyway, any explicit reference to the file in the makefile causes a
target to be considered not precious.

So, you can just add in:

    all: sub1 sub2

or even "foo: sub1 sub2".

-- 
-------------------------------------------------------------------------------
 Paul D. Smith <address@hidden>          Find
some GNU make tips at:
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