[bug #67195] surprising behavior with prerequisite search via vpath

Ben Franksen <[email protected]> Fri, 6 Jun 2025 09:10:26 -0400 (EDT)
Newsgroups	gmane.comp.gnu.make.bugs
Message-ID	<[email protected]>
URL:
  <https://savannah.gnu.org/bugs/?67195>

                 Summary: surprising behavior with prerequisite search via
vpath
                   Group: make
               Submitter: bfrk
               Submitted: Fri 06 Jun 2025 01:10:18 PM GMT
                Severity: 3 - Normal
              Item Group: Bug
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
       Component Version: 4.3
        Operating System: POSIX-Based
           Fixed Release: None
           Triage Status: None


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Follow-up Comments:


-------------------------------------------------------
Date: Fri 06 Jun 2025 01:10:18 PM GMT By: Ben Franksen <bfrk>
A minimal example is attached, but it is so simple that I as well describe it
here completely. We have one Makefile and one prerequisite (file.x) in these
directories:

./lib/include/file.x
./src/Makefile

The Makefile is

vpath %.x ../lib/include

all: ../include/file.x

../include/%.x: %.x
	mkdir ../include
	cp $< $@

To reproduce, cd to "src", then run make. Expected behavior is for the recipe
to be run i.e.

	mkdir ../include
	cp ../lib/include/file.x ../include/file.x

What I get is

make: Nothing to be done for 'all'.

Note that the target file ../include/file.x does not exist. But it does exist
as a path relative to directory listed in the vpath and perhaps this is why
make (wrongly, IMO) thinks that there is nothing to be done?






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