override and +=

[Michael Morrell]

I'm using gmake 3.81.  I read the manual about override and +=, but I
guess
I didn't understand it.  With the following Makefile:

=============================
override F := "a b c"
F += d

all:
        @echo $F
==============================

I expected the "override" to have no effect unless I defined F on the
command line.  Here's what I see:

% make
a b c
% make F="hello"
a b c

In neither case, is the += doing anything.  Can someone explain this?

Thanks,

  Michael


      
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