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

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 the file exists on the disk or whether it's out of date with respect to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.
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