From: jrubin AT BIX DOT com
Date: Fri, 06 Sep 1996 23:45:33 -0400 (EDT)
Subject: Low overhead long double support
To: djgpp-workers AT delorie DOT com
Message-id: <9609062345.memo.12170@BIX.com>
Content-transfer-encoding: 7BIT

I think I know a way to provide long double support without encumbering
people who don't need it. 
Library routines like printf can declare pointers to the long double
conversion routines with the 'weak' attribute. These pointers will have
the value 0 at runtime unless the user explicitly links in the long
double library. Callers can test the pointer at runtime and do the right
thing.