I first noticed this issue after an update to gawk 4.1.3. If the third argument
in a call to gensub is bogus a warning is generated where is used to silently
pass through:
$ echo asdf | gawk '{print gensub(/a/,"b","")}'
gawk: cmd. line:1: (FILENAME=- FNR=1) warning: gensub: third argument `'
treated as 1
bsdf
$ gawk -V
GNU Awk 4.1.3, API: 1.1 (GNU MPFR 3.1.3, GNU MP 6.0.0)
Copyright (C) 1989, 1991-2015 Free Software Foundation.
On other gawk versions this is the behavior:
$ echo asdf | gawk '{print gensub(/a/,"b","")}'
Bsdf
Appears to be resolved by this patch:
https://www.sourceware.org/ml/libc-alpha/2015-08/msg00269.html
John
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