[bug #16670] Repeated backslash-escaped newlines not POSIXly replaced

[Paul D. Smith]

Update of bug #16670 (project make):

                  Status:                    None => Fixed                  
             Assigned to:                    None => psmith                 
             Open/Closed:                    Open => Closed                 
           Fixed Release:                    None => CVS                    

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Follow-up Comment #3:

I modified the .POSIX pseudo target behavior so that if it's set, then we get
POSIX-style backslash/newline handling.  The default, though, remains the GNU
make method.

If you want to portably get the POSIX behavior without specifying .POSIX, you
can do this:


# empty variable
E =
FOO = a      $E
$E
b

That is, add empty variable references so that the parser doesn't think that
the backslash/newlines are really consecutive, and that the whitespace is not
trailing.

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