Re: make: empty expansion if mixing round and curly braces

[David Holland <dholland-tech%netbsd.org@localhost>]

On Tue, May 07, 2019 at 04:58:38PM +0200, Edgar Fu? wrote:
 > I just again starred at a mis-behaving Makefile to notice that (b)make 
 > silently expands a variable to nothing if you mix normal and curly braces,
 > i.e. $(var} or ${var). This is extremly painful to spot.

It's a "feature":

   ------
BRACE=}
VAR$(BRACE)=plop

foo:
	echo $(VAR})
   ------
% make
echo plop
plop
% 

I'm not sure what make thinks the variable name is if you leave off
the close-paren entirely, but I'm sure it's *something* and if you can
figure out what you can give that variable a value... at least if you
can load all the characters needed into other variables, which for
some characters is challenging.

This sort of nonsense should be prohibited, really...

-- 
David A. Holland
dholland%netbsd.org@localhost