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Subject: Re: [gentoo-user] [OT] emerge default opts
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From: Michael Orlitzky <mjo@gentoo.org>
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Date: Sun, 15 Oct 2017 10:31:29 -0400
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On 10/14/2017 09:30 PM, Dale wrote:
> 
> While at it.  Is there a tool that tells when USE flags in make.conf is
> either no longer used or doesn't even exist anymore? 

I don't know of one. It doesn't *sound* hard, but you would have to
consider local use flags, flags from overlays, USE_EXPAND flags,
wildcards, USE_ORDER, etc. -- so maybe it's actually hard/slow to do it.

I found this feature request,

  https://github.com/vaeth/eix/issues/38

and I guess that confirms that it's harder than it looks. Checking for
nonexistent flags would be easier than checking for redundant flags
because the latter depends on your package manager configuration.