[bug #58497] inconsistent newline removal in $(file <)

[Paul D. Smith]

Update of bug #58497 (project make):

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

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Follow-up Comment #3:

Thanks for the patch (Ken) and regression test (Dmitry).

I used Ken's idea of keeping a count: I think that since we need to compare
"buffer pointer - 1", not just equality, it's still possible get the wrong
behavior using pointer comparison.

I installed Dmitry's regression tests, with a few tweaks to avoid
system-specific behaviors (echo -n is not portable) and use a few handy Perl
and test suite methods.

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