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The --warn / .WARNINGS feature

From: Paul Smith
Subject: The --warn / .WARNINGS feature
Date: Mon, 03 Apr 2023 08:47:55 -0400
User-agent: Evolution 3.48.0 (by Flathub.org)

I pushed my changes to implement the --warn / .WARNINGS feature.  I
hope people find them useful.  As of now there are only 3 possible
warnings, but I will be looking through other warnings that might be
useful to control.

There is one major caveat to this: currently it's not possible to set
.WARNINGS as a target-specific variable and override warning settings
for just that target (and prerequisites).  Making this work ended up
being tricky as currently "special variables" are not checked at all
during target-specific handling, and the way warnings work we are not
re-interpreting the value of that variable every time we want to check
how to handle a warning.

I will think about whether there's a good way to deal with this but for
now, you can't control warnings on a per-target basis.

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