grep -P in OF template Makefile: really useful?

[Julien Bect]

Hi everyone,

The template Makefile for OF packages 
(https://octave.sourceforge.io/templates/Makefile) contains this line:

PKG_ADD := $(shell grep -sPho '(?<=(//|\#\#) PKG_ADD: ).*' $(CC_SOURCES) 
$(M_SOURCES))

It turns out that this can cause problems on some platforms where grep 
-P is not supported [1].

Could anybody familiar enough with regexps tell me if the -P flag is 
actually useful for this particular regexp?

If it is, could we find a way to rewrite the regexp that would not 
require PCRE?

@++
Julien


[1] See https://sourceforge.net/p/octave/package-releases/298/#c4a6/ab8b 
for an example