[bug #712] GNU make can't handle spaces in pathnames

[Mark K Cowan]

Follow-up Comment #15, bug #712 (project make):

Would it be possible to have a special target .NULL_DELIMITED_LISTS to tell
Make to use the null character as the list separator instead of whitespace?

That way we keep 100% backward compatability and also provide a simple way to
support whitespace in filenames.  This would also allow more complex
wildcard-ing such as:

    .NULL_DELIMITED_LISTS
    
    ...
    
    sources=$(shell find -name '*.in' {many predicates} -print0)
    targets=$(sources:%.in=%.out)
    
    ...
    
    %.out: %.in
        some-command < $^ > $@

Make would also automatically escape the whitespace in variables when building
shell commands.

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