[bug #59490] target may not be remade if prerequisite has no recipe

[Greg Minshall]

URL:
  <https://savannah.gnu.org/bugs/?59490>

                 Summary: target may not be remade if prerequisite has no
recipe
                 Project: make
            Submitted by: minshall
            Submitted on: Fri 20 Nov 2020 06:52:47 AM UTC
                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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Details:

i have a feeling this is already known, and maybe accepted, behavior, but it
seems wrong, non-intuitive, to me.

if i have a dependency chain like
++
b1: a1
  touch b1
  touch c1
c1: b1
d1: c1
  touch d1
--

then, if b1 needs to be re-made, d1 will *not* be remade, even though c1's
prerequisite b1 is out of date.

if i change to 'c1: b1;', it works.

i find the behavior surprising, and i would think worthy of changing.  (i'm
guessing this is an optimization?)

with the attached Makefile, a 'make test' will show failure (or, success,
should it succeed).




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File Attachments:


-------------------------------------------------------
Date: Fri 20 Nov 2020 06:52:47 AM UTC  Name: Makefile  Size: 2KiB   By:
minshall
make test
<http://savannah.gnu.org/bugs/download.php?file_id=50308>

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