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Add -N: a safe, $(MAKE) proof version of -n

From: 積丹尼 Dan Jacobson
Subject: Add -N: a safe, $(MAKE) proof version of -n
Date: Fri, 07 Jul 2017 23:30:08 +0800

Sometimes the user just wants -n to always just print, despite the
little $(MAKE) landmines buried deep in a Makefile. (info "(make)
Instead of Execution")

Yes, he doesn't want to worry that the code will explode in his face,
calling up Moscow on the hotline, etc.

Thus I hereby propose that you please consider adding -N, a safe version
of -n that is guaranteed never to execute anything.

Maybe have it print special messages when it encounters $(MAKE)s, or
whatever, but just - don't - have - it - execute - code. Thank you.

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