Re: Use result of sub-make as a prerequisite?

[Noel Yap]

Read http://aegis.sourceforge.net/auug97.pdf.

HTH,
Noel

Nestor Amaya wrote:
> 
> Hello,
> 
> My question: Is there a way for the top-level make to use a sub-make to
> check for whether test.db is up-to-date or not?
> 
> Take this simple makefile:
> #START Makefile
> %.db :
>         $(MAKE) -C db $@
> 
> all.log : test.db
>         @echo remaking all | tee all.log
> #END Makefile
> 
> Now assume that the sub-make within "db" dir is a complicated one, with many
> checks, etc...
> 
> In my tests, "all.log" will be remade even if "test.db" is up to date,
> because the top-level make doesn't know what the prereqs for "test.db" are,
> and thus assumes that it must be remade.
> 
> I have tried using VPATH so that the top-level make "sees" db/test.db, but
> then it never makes all.log even if test.db is out-of-date (since there are
> no pre-reqs)...
> 
> I guess I could try to auto-generate the pre-reqs for test.db using the
> sub-make, and then include them into the top-level make. But then I am
> testing "test.db" twice to see if it is up-to-date... This seems clumsy and
> inefficent.
> 
> Is there any other way? Your help is much appreciated.
> 
> Cheers,
> Nestor
> 
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