Re: [HELP] PHONY pattern rule makes the file w/ the same name

[Renaud Pacalet]

On 05/10/2023 12:27, Bahman Movaqar wrote:
> On Wed, 2023-10-04 at 10:55 -0400, Paul Smith wrote:
> > Sorry but I don't really understand the problem.  Maybe you can explain
> > it more clearly: provide the shortest, simplest repro case and show
> > both what happened and what you expected to see, and explain why you
> > expected it.
>
> Good idea.  Please see this repository:
> https://github.com/throw-away-repos/make-pattern-rules
>
>
> > That's not really right.  What .PHONY means is that make will _always_
> > rebuild that target (if it is considered), regardless of whether or not
> > the file exists on the disk or whether it's out of date with respect to
> > its prerequisites.
>
> I see where I misunderstood .PHONY.
>
> > It also means that implicit rules are not searched, for PHONY targets.
> > See:
> > https://www.gnu.org/software/make/manual/html_node/Phony-Targets.html
>
> I definitely needed to re-read this!  That said, I'm still confused.
>
> I'm thinking that my understanding of implicit rule search combined w/
> .PHONY is not enough to explain the situation in the repository above.

Could be related to 
https://www.gnu.org/software/make/manual/make.html#Remaking-Makefiles:

> after reading in all makefiles make will consider each as a goal target, in the 
> order in which they were processed, and attempt to update it

So, in your case, make tries to update the 2 included makefiles 
(mk/scenario1.mk and mk/scenario2.mk). As you provide pattern rules for 
that, make will build:

1. foo1-by-scenario1 because mk/scenario1.mk depends on it
2. mk/scenario1.mk
3. foo2 because mk/scenario2.mk depends on it
4. mk/scenario2.mk
5. scenario1.first-scenario
6. sep
7. scenario2.second-scenario

The out is thus normal.
--
Renaud Pacalet
Télécom Paris
Campus SophiaTech
450 Route des Chappes, CS 50193
06904 Biot Sophia Antipolis cedex, FRANCE
Tel : +33 (0) 4 9300 8402
Web : http://www.telecom-paris.fr/