[bug #58639] Shortest stem not matched

[Miles]

URL:
  <https://savannah.gnu.org/bugs/?58639>

                 Summary: Shortest stem not matched
                 Project: make
            Submitted by: milesf
            Submitted on: Sun 21 Jun 2020 10:39:50 PM UTC
                Severity: 3 - Normal
              Item Group: Bug
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
       Component Version: 4.2.1
        Operating System: None
           Fixed Release: None
           Triage Status: None

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Details:

With this makefile:


foo/%/baz:
    @echo "Prereq - stem $*"

foo/%/baz/thing.txt: foo/%/baz
    @echo "Good match - stem $*"

foo/%:
    @echo "Bad match - stem $*"


I'd expect the shortest stem (bar) to be matched as follows:


> make foo/bar/baz/thing.txt
Prereq - stem bar
Good match - stem bar


However, it matches the longer stem (bar/baz/thing.txt) instead:


> make foo/bar/baz/thing.txt
Bad match - stem bar/baz/thing.txt


The makefile works as expected if either removing the "Bad match" rule or the
prerequisite from the "Good match" rule.




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