Dan Nicholson wrote:

> So, I guess you could put the colon in.  It should work the same
> except in the situation where CFLAGS is null:
> 
> $ export CFLAGS=""
> $ echo ${CFLAGS:--O3}
> -O3
> $ echo ${CFLAGS--O3}
> 
> What do you think is more proper?

I'd say that the use of the colon is better.
  -- Bruce
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