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[bug #63016] Recursive variable references itself (eventually) when expo

From: Paul D. Smith
Subject: [bug #63016] Recursive variable references itself (eventually) when exporting to $(shell)
Date: Thu, 8 Sep 2022 03:09:44 -0400 (EDT)

Update of bug #63016 (project make):

                  Status:                    None => Fixed                  
             Assigned to:                    None => psmith                 
             Open/Closed:                    Open => Closed                 
           Fixed Release:                    None => SCM                    
           Triage Status:                    None => Small Effort           


Follow-up Comment #1:

I pushed a fix.  I think it might be possible to do better: one can imagine a
situation where you wouldn't treat the expansion of a variable to put into the
environment as a recursive expansion of a variable used in a recipe.  But to
do that would require more work and I couldn't convince myself (or find an
example makefile) where it would make a real difference.

In this change, variables that are recursively expanded into the environment
of a shell function will be set as the empty string rather than throwing an


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