[bug #44742] Double-dep with double-colon rule not built

[Ed]

URL:
  <http://savannah.gnu.org/bugs/?44742>

                 Summary: Double-dep with double-colon rule not built
                 Project: make
            Submitted by: mohawk
            Submitted on: Mon 06 Apr 2015 00:08:02 GMT
                Severity: 3 - Normal
              Item Group: Bug
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
       Component Version: 4.1
        Operating System: POSIX-Based
           Fixed Release: None
           Triage Status: None

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Details:

If you do "make -j4 linkext", it will not link the *.so. If you do "make -j4
dynamic", or "make -j1 linkext", it will.

This is the whole of the "linkext" rule:

linkext :: dynamic
        $(NOECHO) $(NOOP)


I attach the fuller log, the (cut-down) Makefile, the "remake -x" output of
each case.

Full repro by: cpanm --dev --look PDL; cd Basic/Core; make linkext

Log:

$ make -v
GNU Make 4.1
[...]
$ remake -v
GNU Make 4.1+dbg0.91
[...]
$ rm -rf ../../blib ; make clean >/dev/null; mv Makefile.old Makefile ; cp
Version.pm.KEPT Version.pm ; cp Types.pm.KEPT Types.pm ; remake -x linkext
>output.linkext ; l ../../blib/arch/auto/PDL/Core/Core.so
Using new 64bit index support
Using new 64bit index support
ls: cannot access ../../blib/arch/auto/PDL/Core/Core.so: No such file or
directory
$ rm -rf ../../blib ; make clean >/dev/null; mv Makefile.old Makefile ; cp
Version.pm.KEPT Version.pm ; cp Types.pm.KEPT Types.pm ; remake -x dynamic
>output.dynamic ; l ../../blib/arch/auto/PDL/Core/Core.so
Using new 64bit index support
Using new 64bit index support
-rwxr-xr-x. 1 user user 168335 Apr  6 00:42
../../blib/arch/auto/PDL/Core/Core.so




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File Attachments:


-------------------------------------------------------
Date: Mon 06 Apr 2015 00:08:02 GMT  Name: log.txt  Size: 1kB   By: mohawk

<http://savannah.gnu.org/bugs/download.php?file_id=33553>
-------------------------------------------------------
Date: Mon 06 Apr 2015 00:08:02 GMT  Name: output.dynamic  Size: 24kB   By:
mohawk

<http://savannah.gnu.org/bugs/download.php?file_id=33554>
-------------------------------------------------------
Date: Mon 06 Apr 2015 00:08:02 GMT  Name: Makefile  Size: 11kB   By: mohawk

<http://savannah.gnu.org/bugs/download.php?file_id=33555>
-------------------------------------------------------
Date: Mon 06 Apr 2015 00:08:02 GMT  Name: output.linkext  Size: 21kB   By:
mohawk

<http://savannah.gnu.org/bugs/download.php?file_id=33556>

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