[bug #61226] A regression prevents generation of missing included dependency files.

[Dmitry Goncharov]

URL:
  <https://savannah.gnu.org/bugs/?61226>

                 Summary: A regression prevents generation of missing included
dependency files.
                 Project: make
            Submitted by: dgoncharov
            Submitted on: Sun 26 Sep 2021 02:34:37 PM UTC
                Severity: 3 - Normal
              Item Group: Bug
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
       Component Version: SCM
        Operating System: None
           Fixed Release: None
           Triage Status: None

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Details:

7c4e6b0299774280e3a93060c70c661f459aaf40 introduced a change in main.c, among
others.
This change causes make to exit with an error message when a rule that matches
an included file does not create the file.
This change is good when the included file is indeed intended to be created.
However, this change is a regression when the included file is not intended to
be created, as in the case of generated dependency files.
E.g.


hello.o: hello.d; touch $@ $<
hello.d:;
include hello.d


In this makefile the rule 'hello.d:;' is not intended to create 'hello.d'.
Instead, when 'hello.d' is missing make runs 'hello.d:;' rule and imagines
'hello.d' was updated and then proceeds to create 'hello.o' and thus generates
'hello.d' as a byproduct of 'hello.o' generation.




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