[bug #66500] Caching of timestamps prevents proper builds

[Grzegorz Jabłoński]

URL:
  <https://savannah.gnu.org/bugs/?66500>

                 Summary: Caching of timestamps prevents proper builds
                   Group: make
               Submitter: gwj
               Submitted: Sat 30 Nov 2024 03:15:29 PM UTC
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
       Component Version: None
        Operating System: None
           Fixed Release: None
           Triage Status: None


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Follow-up Comments:


-------------------------------------------------------
Date: Sat 30 Nov 2024 03:15:29 PM UTC By: Grzegorz Jabłoński <gwj>
Due to make caching timestamps, building baz after updating bar requires
invoking make twice.

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 22.04.5 LTS
Release:        22.04
Codename:       jammy
$ make --version
GNU Make 4.3
Built for x86_64-pc-linux-gnu
Copyright (C) 1988-2020 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
$ touch bar
$ make
mkdir foo
touch foo/tar
touch baz
$ make
make: 'baz' is up to date.
$ touch bar
$ make
mkdir foo
mkdir: cannot create directory ‘foo’: File exists
make: [makefile:5: foo] Error 1 (ignored)
touch foo/tar
$ make
mkdir foo
mkdir: cannot create directory ‘foo’: File exists
make: [makefile:5: foo] Error 1 (ignored)
touch foo/tar
touch baz








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