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Date: Thu, 20 Jan 2011 15:53:18 -0800
From: Matthew Jacob <mj@feral.com>
Organization: Feral Software
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Cc: 
Subject: removing -frename-registers from sys/conf.mk
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It helps substantially in trying to debug amd64 kernels to remove this flag.

Has anyone heard of a good reason we need to keep this? Whom else should 
I ask?