diff options
Diffstat (limited to 'unit-tests/counter.mk')
| -rw-r--r-- | unit-tests/counter.mk | 17 |
1 files changed, 7 insertions, 10 deletions
diff --git a/unit-tests/counter.mk b/unit-tests/counter.mk index 23e7dcc0e8d2..3c75d7a5032a 100644 --- a/unit-tests/counter.mk +++ b/unit-tests/counter.mk @@ -1,15 +1,12 @@ -# $NetBSD: counter.mk,v 1.1 2020/08/02 14:53:02 rillig Exp $ +# $NetBSD: counter.mk,v 1.5 2020/10/17 16:57:17 rillig Exp $ # -# Demonstrates that it is not easily possible to let make count -# the number of times a variable is actually accessed. +# Demonstrates how to let make count the number of times a variable +# is actually accessed, using the ::= variable modifier. # -# As of 2020-08-02, the counter ends up at having 4 words, even -# though the NEXT variable is only accessed 3 times. This is -# surprising. -# -# A hint to this surprising behavior is that the variables don't -# get fully expanded. For example, A does not simply contain the -# value "1" but an additional unexpanded ${COUNTER:...} before it. +# This works since 2020-09-23. Before that, the counter ended up at having +# 4 words, even though the NEXT variable was only accessed 3 times. +# The cause for this surprising behavior was that the ::= variable modifiers +# returned an error marker instead of a simple empty string. RELEVANT= yes (load-time part) # just to filter the output |