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[bug #57674] regression in make 4.3 with makefile from stdin

From: Natanael Copa
Subject: [bug #57674] regression in make 4.3 with makefile from stdin
Date: Mon, 27 Jan 2020 06:41:57 -0500 (EST)
User-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.130 Safari/537.36


                 Summary: regression in make 4.3 with makefile from stdin
                 Project: make
            Submitted by: ncopa
            Submitted on: Mon 27 Jan 2020 11:41:55 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



(I tried to send this to address@hidden but is seems to have been redirected
to /dev/null by some spam filter or similar)


I believe there is a regression in make 4.3. To reproduce:

$ make -v
GNU Make 4.3
Built for x86_64-alpine-linux-musl
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.
$ cat Makefile 
        @echo \$(CC)
$ make -sf Makefile 
$ cat Makefile  | env -i make -sf -
make: echo: No such file or directory
make: *** [/tmp/GmOCOMgl:2: all] Error 127

Problem was found in the configure script of mandoc (mdocml).

  CC=`printf "all:\\n\\t@echo \\\$(CC)\\n" | env -i make -sf -`


Downstream bug report:




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