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make: empty expansion if mixing round and curly braces

To: tech-toolchain%netbsd.org@localhost
Subject: make: empty expansion if mixing round and curly braces
From: Edgar Fuß <ef%math.uni-bonn.de@localhost>
Date: Tue, 7 May 2019 16:58:38 +0200

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.

Follow-Ups:
- Re: make: empty expansion if mixing round and curly braces
  - From: David Holland
- Re: make: empty expansion if mixing round and curly braces
  - From: Greg A. Woods

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