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[bug #57692] Parallel make doesn't work well with grouped targets

From: Robert Sachunsky
Subject: [bug #57692] Parallel make doesn't work well with grouped targets
Date: Sun, 10 May 2020 18:49:12 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:56.0) Gecko/20100101 Firefox/56.0 Waterfox/56.3

Follow-up Comment #2, bug #57692 (project make):

Still, I believe this new syntax should really be listed in *.FEATURES*

That way, makefiles which want to employ this (highly valued!) new feature,
can be written in a way that older versions of make can still run them.

The documentation should also reflect that, perhaps with an example like:

ifeq ($(filter grouped-targets,$(.FEATURES)),grouped-targets)
# use new syntax:
output1 output2 &: prereq
        produce -from prereq output1 output2
# use multi-target rule, and disable parallelism globally


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