[bug #61463] private does not suppress inheritance on exported target specific variables

[anonymous]

URL:
  <https://savannah.gnu.org/bugs/?61463>

                 Summary: private does not suppress inheritance on exported
target specific variables
                 Project: make
            Submitted by: None
            Submitted on: Wed 10 Nov 2021 07:28:11 PM 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:

When a target specific variable has both the export and private qualifiers,
inheritance is not suppressed.

The following Makefile illustrates the problem:

a: private export FOO := x
a: b
        env | sort > $@

b: private export BAR := y
b:
        env | sort > $@

Executing the Makefile (env -i used to simplify the output):

$ env -i make
env | sort > b
env | sort > a

Target a has the expected environment:

$ < a
FOO=x
MAKEFLAGS=
MAKELEVEL=1
MAKE_TERMERR=/dev/pts/5
MAKE_TERMOUT=/dev/pts/5
MFLAGS=

Target b's environment contains FOO, which is defined as a private variable on
a, and as such should not be present:

$ < b
BAR=y
FOO=x
MAKEFLAGS=
MAKELEVEL=1
MAKE_TERMERR=/dev/pts/5
MAKE_TERMOUT=/dev/pts/5
MFLAGS=





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