From owner-freebsd-current  Sat May  2 22:36:07 1998
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	Sun, 3 May 1998 15:31:21 +1000
Date: Sun, 3 May 1998 15:31:21 +1000
From: Bruce Evans <bde@zeta.org.au>
Message-Id: <199805030531.PAA06287@godzilla.zeta.org.au>
To: jb@FreeBSD.ORG
Subject: errno change breaks old shared library linkage
Cc: current@FreeBSD.ORG
Sender: owner-freebsd-current@FreeBSD.ORG
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X-Loop: FreeBSD.ORG

The errno changes break old binaries linked to the current libtermcap.so
in the usual way:

	$ less~ /etc/passwd
	/sbin/ld.so: Undefined symbol "___error" called from less~:/lib/libtermcap.so.2.1 at 0x2002212c
	$ ldd `which less~`
	/usr/bde/bin/less~:
		-ltermcap.2 => /lib/libtermcap.so.2.1 (0x2001f000)
		-lgcc.261 => /usr/lib/compat/libgcc.so.261.0 (0x20023000)
		-lc.2 => /usr/lib/compat/libc.so.2.2 (0x20027000)

An interface change like errno -> (*__error()) requires bumping the
major numbers of all shared libraries that use the interface, although
it doesn't necessarily require bumping even the minor number of the
shared library that implements the interface.  libtermcap was last
broken by the issetugid() changes.  The errno change probably affects
more libraries and is harder to kludge around.

Bruce

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