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GNU Make 4.3 compatibility

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* WARNING: Backward-incompatibility!
  Previously appending using '+=' to an empty variable would result in a value
  starting with a space.  Now the initial space is only added if the variable
  already contains some value.  Similarly, appending an empty string does not
  add a trailing space.

https://lwn.net/Articles/810071/
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Alcaro 2020-07-26 18:20:11 +02:00 committed by Screwtapello
parent 24503fc922
commit b9ccb90324
1 changed files with 3 additions and 2 deletions
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5
nall/GNUmakefile
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@ -2,13 +2,14 @@
MAKEFLAGS := Rr
.SUFFIXES:
# An empty variable to defeat make functions that trim whitespace.
[empty] =
[0-9] = 0 1 2 3 4 5 6 7 8 9
[A-Z] = A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
[a-z] = a b c d e f g h i j k l m n o p q r s t u v w x y z
[markup] = ` ~ ! @ \# $$ % ^ & * ( ) - _ = + [ { ] } \ | ; : ' " , < . > / ?
[all] = $([0-9]) $([A-Z]) $([a-z]) $([markup])
[space] :=
[space] +=
[space] := $([empty]) $([empty])
# platform detection
ifeq ($(platform),)