From mboxrd@z Thu Jan  1 00:00:00 1970
From: random832@fastmail.com (Random832)
Date: Sat, 24 Jun 2017 20:50:51 -0400
Subject: [TUHS] What did cc -2 do?
Message-ID: <1498351851.4029367.1020289456.6F4D64BC@webmail.messagingengine.com>

Browsing the source for "cc" in v6 and v7, if invoked with -2 would
replace crt0.o with crt2.o. If the -2 were followed by another character
(probably intended to be -20), it would use crt20.o and use -l2 instead
of -lc.

These options seem to be undocumented, and I can't find any source code
of these libraries or indication as to what the purpose was.